{"id":21521,"date":"2020-10-30T09:52:13","date_gmt":"2020-10-30T07:52:13","guid":{"rendered":"https:\/\/www.victronenergy.com\/blog\/?p=21521"},"modified":"2026-02-02T14:37:02","modified_gmt":"2026-02-02T12:37:02","slug":"how-to-install-a-multiplus-inverter-charger","status":"publish","type":"post","link":"https:\/\/www.victronenergy.com\/blog\/2020\/10\/30\/how-to-install-a-multiplus-inverter-charger\/","title":{"rendered":"How to Install a MultiPlus Inverter\/Charger?"},"content":{"rendered":"<div>\n<p>Peter Kennedy is an experienced Victron Dealer\/Installer specialising in Marine applications. His company website <a href=\"https:\/\/shop.pkys.com\" target=\"_blank\">PKYS<\/a> carries a useful guide to installing a <a href=\"https:\/\/www.victronenergy.com\/inverters-chargers\/multiplus-12v-24v-48v-800va-3kva\" target=\"_blank\">MultiPlus<\/a> Inverter.<\/p>\n<p>In it Peter adds a whole world of information to the Victron Energy MultiPlus installation manual. He discusses the practicalities of installing a MultiPlus Inverter in compliance with the standards of the American Boat and Yacht Council (<a href=\"https:\/\/abycinc.org\" target=\"_blank\">ABYC<\/a>); he explains what we&#8217;re looking at when we remove the front panel; and he explains the connection-options to other devices.<\/p>\n<p>We are grateful to him for allowing us to reproduce his advice here:<\/p>\n<h2>Introduction<\/h2>\n<div>This article details the installation of the US Version of the Multiplus 12\/3000.\u00a0 \u00a0This is a 12 Volt DC 120 Volt AC inverter\/charger.\u00a0 The official title is\u00a0MultiPlus 12\/3000\/120-50 120V VE.Bus and the title indicates that the inverter output is 3000 VA, the charger is rated for 120 Amps and it has a 50 Amp transfer switch.\u00a0 This blog post details unpacking, mounting and wiring your new MultiPlus.<\/div>\n<h4>Quick Install Sheet<\/h4>\n<\/div>\n<div>If you have built an Ikea bookcase you will instantly recognize the style of the <a href=\"https:\/\/www.victronenergy.com\/upload\/documents\/Quick-Install-Guide-MultiPlus-12V-24V-48V-3000VA-50A-EN_outlines.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">Quick Install Sheet<\/a>.\u00a0 It is showing you what is in the box, what isn&#8217;t in the box, how to mount the unit and how to wire it up. It&#8217;s not that easy to follow, so I am going to interpret it in conjunction with the other more detailed manuals, which lack drawings, and I will maybe throw in a photo or two for good measure.<\/div>\n<div>\n<h4>What&#8217;s included in the box?<\/h4>\n<div>\n<div>\n<ul>\n<li>Multi Plus<\/li>\n<li>Wall mounting plate<\/li>\n<li>Fasteners<\/li>\n<li>Temperature sensor,<\/li>\n<li>User manuals<\/li>\n<\/ul>\n<p><a href=\"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/Multiplus-included_147551080.png\" target=\"_blank\"><div class=\"full-size-image container\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-21525\" src=\"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/Multiplus-included_147551080.png\" alt=\"\" width=\"358\" height=\"516\" srcset=\"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/Multiplus-included_147551080.png 358w, https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/Multiplus-included_147551080-208x300.png 208w\" sizes=\"auto, (max-width: 358px) 100vw, 358px\" \/><\/div><\/a><\/p>\n<h4>What&#8217;s not included?<\/h4>\n<ul>\n<li>Battery<\/li>\n<li>Battery cable<\/li>\n<li>Battery switch<\/li>\n<li>Fuse and fuseholder<\/li>\n<li>Remote control panel<\/li>\n<li>Cable to connect remote control panel<\/li>\n<li>AC input wires<\/li>\n<li>AC output wires<\/li>\n<li>Grounding cable<\/li>\n<li>Voltage sense cable<\/li>\n<li>Other optional cables<\/li>\n<\/ul>\n<p><a href=\"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/Multiplus-notincluded_147551077.png\" target=\"_blank\"><div class=\"full-size-image container\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-21524\" src=\"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/Multiplus-notincluded_147551077.png\" alt=\"\" width=\"364\" height=\"625\" srcset=\"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/Multiplus-notincluded_147551077.png 364w, https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/Multiplus-notincluded_147551077-175x300.png 175w\" sizes=\"auto, (max-width: 364px) 100vw, 364px\" \/><\/div><\/a><\/p>\n<h4>Don&#8217;t install an inverter above the batteries<\/h4>\n<div>This is an ABYC requirement.\u00a0 Lead acid batteries give off corrosive gases that can destroy equipment directly above them, even sealed batteries can vent corrosive gases on occasion. The following diagram is showing you that the MultiPlus needs some space around it for ventilation.\u00a0 The <a href=\"https:\/\/www.victronenergy.com\/upload\/documents\/Service-Manual-MultiPlus-3k-120V-(firmware-xxxx4xx)-EN-ES.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">Service Manual<\/a> gives you more details about the mounting including the following:\u00a0 &#8220;The product must be installed in a dry and well-ventilated area, as close as possible to the batteries. There should be a clear space of at least 10cm around the appliance for cooling.&#8221;; \u00a0and also: &#8220;The device can be fitted either horizontally or vertically<i>. For optimal cooling, vertical fitting is preferred<\/i>.&#8221;\u00a0 There is more mounting information in the <a href=\"https:\/\/www.victronenergy.com\/upload\/documents\/Service-Manual-MultiPlus-3k-120V-(firmware-xxxx4xx)-EN-ES.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">Service manual.<\/a><\/div>\n<\/div>\n<\/div>\n<div>\n<h3><a href=\"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/multiplus-dont-install-over-batteries_147551421.png\" target=\"_blank\"><div class=\"full-size-image container\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-21527\" src=\"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/multiplus-dont-install-over-batteries_147551421.png\" alt=\"\" width=\"362\" height=\"262\" srcset=\"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/multiplus-dont-install-over-batteries_147551421.png 362w, https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/multiplus-dont-install-over-batteries_147551421-300x217.png 300w\" sizes=\"auto, (max-width: 362px) 100vw, 362px\" \/><\/div><\/a><\/h3>\n<h4>Mounting is easy<\/h4>\n<div>You screw the mounting bracket to the wall.\u00a0 Hang the MultiPlus on the bracket.\u00a0 Pop two screws in the bottom to stop it jumping off.\u00a0 If you are installing it horizontally the same applies.<\/div>\n<div><a href=\"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/Multiplus-mounting-bracket_147551419.png\" target=\"_blank\"><div class=\"full-size-image container\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-21526\" src=\"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/Multiplus-mounting-bracket_147551419.png\" alt=\"\" width=\"361\" height=\"262\" srcset=\"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/Multiplus-mounting-bracket_147551419.png 361w, https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/Multiplus-mounting-bracket_147551419-300x218.png 300w\" sizes=\"auto, (max-width: 361px) 100vw, 361px\" \/><\/div><\/a><\/div>\n<div>\n<!-- iframe plugin v.6.0 wordpress.org\/plugins\/iframe\/ -->\n<iframe loading=\"lazy\" 0=\"src=&quot;&lt;iframe\" width=\"100%\" height=\"400\" src=\"https:\/\/www.youtube.com\/embed\/MuMNpYjOAys\" frameborder=\"0\" allow=\"accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture\" 1=\"allowfullscreen&gt;&lt;\/iframe&gt;&quot;\" allowfullscreen=\"allowfullscreen\" scrolling=\"yes\" class=\"iframe-class\"><\/iframe>\n<\/div>\n<div><\/div>\n<\/div>\n<\/div>\n<div>\n<h4>Connecting the small cables<\/h4>\n<div>This next diagram is a bit confusing because the current model of the MultiPlus doesn&#8217;t look like the drawing.\u00a0 At this point it would be helpful to have an actual photograph to see what it really looks like.\u00a0 As we go along I will explain what all the connections are.<\/div>\n<div><a href=\"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/Multiplus-small-cables_147551679.png\" target=\"_blank\"><div class=\"full-size-image container\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-21530\" src=\"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/Multiplus-small-cables_147551679.png\" alt=\"\" width=\"367\" height=\"263\" srcset=\"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/Multiplus-small-cables_147551679.png 367w, https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/Multiplus-small-cables_147551679-300x215.png 300w\" sizes=\"auto, (max-width: 367px) 100vw, 367px\" \/><\/div><\/a><\/div>\n<\/div>\n<div><\/div>\n<div>In the service manual Appendix A gives a drawing to help identify the components and connections.<a href=\"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/multiplus-AppendixA_147551790.png\" target=\"_blank\"><div class=\"full-size-image container\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-21532\" src=\"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/multiplus-AppendixA_147551790.png\" alt=\"\" width=\"638\" height=\"636\" srcset=\"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/multiplus-AppendixA_147551790.png 638w, https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/multiplus-AppendixA_147551790-150x150.png 150w, https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/multiplus-AppendixA_147551790-300x300.png 300w\" sizes=\"auto, (max-width: 638px) 100vw, 638px\" \/><\/div><\/a><\/div>\n<div><\/div>\n<div>Here&#8217;s a photograph of the same view:<\/div>\n<div><\/div>\n<div><a href=\"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/MultiPlus-Inside-View_147551756.jpg\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-large wp-image-21531\" src=\"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/MultiPlus-Inside-View_147551756-1024x935.jpg\" alt=\"\" width=\"1024\" height=\"935\" srcset=\"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/MultiPlus-Inside-View_147551756-1024x935.jpg 1024w, https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/MultiPlus-Inside-View_147551756-1500x1370.jpg 1500w, https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/MultiPlus-Inside-View_147551756-750x685.jpg 750w, https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/MultiPlus-Inside-View_147551756-2048x1870.jpg 2048w, https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/MultiPlus-Inside-View_147551756-1536x1403.jpg 1536w, https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/MultiPlus-Inside-View_147551756-768x701.jpg 768w, https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/MultiPlus-Inside-View_147551756-300x274.jpg 300w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/div>\n<div><\/div>\n<div>The connections for the small wires are all in the set of green terminals in the very bottom of the photo. They are all labelled as E in the diagram above. The image below shows what they look like without the wires in the way:<\/div>\n<div><a href=\"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/image_147552217.jpeg\" target=\"_blank\"><div class=\"full-size-image container\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-21533\" src=\"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/image_147552217.jpeg\" alt=\"\" width=\"387\" height=\"84\" srcset=\"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/image_147552217.jpeg 387w, https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/image_147552217-300x65.jpeg 300w\" sizes=\"auto, (max-width: 387px) 100vw, 387px\" \/><\/div><\/a><\/div>\n<div>\n<ul>\n<li>The first pair labelled T-Sense are for a temperature sensor.\u00a0 The sensor mounts on the battery negative terminal.\u00a0 The wires are labelled +ive for red and -ive for black.<\/li>\n<li>The Aux1 and Aux2 are input terminals and are programmable.\u00a0 We will discuss these when we get to the programming section in a future blog post, typical uses include remote control from the Battery Management System (BMS) of a Lithium Battery where they could be programmed as &#8220;allow to charge&#8221; and &#8220;allow to discharge&#8221;<\/li>\n<li>The Ground Relay terminal is used if you are installing an Autotransformer, see <a href=\"https:\/\/www.victronenergy.com\/autotransformers\/autotransformers#downloads-manuals\" target=\"_blank\" rel=\"noopener noreferrer\">Autotransformer Instructions<\/a>\u00a0for further details<\/li>\n<li>The trickle charger terminal can be used for charging an auxiliary battery such as a starting battery.\u00a0 This is just the positive connection.\u00a0 The battery negatives must be common to each other. Max output is 4 Amps<\/li>\n<li>K1 and K2 terminals are relay contacts which are programmable and can be used, for example, to automatically start a generator<\/li>\n<li>The V Sense wire can be connected to the battery to give a more accurate reading of the battery avoiding voltage drop in the battery main cables.\u00a0 Installing a voltage sense wire is not required but it does give improved performance because the sensor reads the actual battery voltage and can compensate when charging for up to a one volt drop in the cables. There is a +ive and -ive connection that goes to battery positive and negative. (A fuse is required)<\/li>\n<\/ul>\n<h4 id=\"C4\">Main Battery Cables<\/h4>\n<p>The next panel shows the main battery cable connections.<\/p>\n<p><a href=\"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/image_147552304.png\" target=\"_blank\"><div class=\"full-size-image container\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-21534\" src=\"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/image_147552304.png\" alt=\"\" width=\"364\" height=\"261\" srcset=\"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/image_147552304.png 364w, https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/image_147552304-300x215.png 300w\" sizes=\"auto, (max-width: 364px) 100vw, 364px\" \/><\/div><\/a><\/p>\n<div>In the diagram above they show a single positive and a single negative cable, but if you look at the picture below you can see there are two studs you can connect to for each with the intention that if necessary you can double-up the cables.\u00a0 The diagram above does not show a battery switch but in the ABYC standards this is a requirement.\u00a0 You need to be able to turn this off if there is a problem or if you want to work on the system.\u00a0 The service manual goes into the cable size in some detail.<\/div>\n<div><a href=\"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/image_147552310.png\" target=\"_blank\"><div class=\"full-size-image container\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-21535\" src=\"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/image_147552310.png\" alt=\"\" width=\"263\" height=\"192\" \/><\/div><\/a><\/div>\n<\/div>\n<div><\/div>\n<div>The service manual suggests using doubled-up 1\/0 cables for the main supply and suggests using a 400 Amp fuse for the 12\/3000 multiplus.\u00a0 A <a href=\"https:\/\/shop.pkys.com\/Blue-Sea-5121-Fuse-A3T-Class-T-400-Amp_p_2195.html\" target=\"_blank\">Class T fuse<\/a> would be appropriate for this application.\u00a0 The ABYC has quite a bit to say about using doubled-up connectors like this; I have summarized it in the footnotes.\u00a0 According to my reading of the ABYC standard if you were using standard 105\u00b0C rated battery cable you would need to use 4\/0 AWG cable if you had a 400 amp fuse in the line.\u00a0 The main principal to bear in mind here is that the cables carry a lot of load and the load carrying capacity must match the circuit protection.\u00a0 If doubled-up cables are used the ABYC says each individual cable must be capable of carrying the entire load by itself and they must share a single fuse.\u00a0 The cables need to be as short as possible to reduce voltage drop, the longer they are the greater the cross sectional area needs to be, and the less voltage drop there is the better the performance.<\/div>\n<div>\n<h4>Aux Battery Charger<\/h4>\n<p>This next panel shows the charging circuit for an auxiliary battery such as a starting battery.\u00a0 It has a maximum 4 amp output.\u00a0 The drawing shows that the Aux battery and the Main battery must share a common negative.\u00a0 Then the only wire you need for this is the positive wire.\u00a0 The drawing doesn&#8217;t show a fuse for this wire but one is required at the battery end.\u00a0 The wire connects to the terminal labelled &#8220;trickle charge&#8221; in the middle of the set of green terminal strips.<a href=\"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/image_147553123.png\" target=\"_blank\"><div class=\"full-size-image container\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-21536\" src=\"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/image_147553123.png\" alt=\"\" width=\"367\" height=\"264\" srcset=\"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/image_147553123.png 367w, https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/image_147553123-300x216.png 300w\" sizes=\"auto, (max-width: 367px) 100vw, 367px\" \/><\/div><\/a><\/p>\n<\/div>\n<div>\n<h4>Connecting a remote panel<\/h4>\n<div>A remote panel is not included with the MultiPlus but is available separately. <a href=\"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/image_147553126.png\" target=\"_blank\"><div class=\"full-size-image container\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-21537\" src=\"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/image_147553126.png\" alt=\"\" width=\"365\" height=\"261\" srcset=\"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/image_147553126.png 365w, https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/image_147553126-300x215.png 300w\" sizes=\"auto, (max-width: 365px) 100vw, 365px\" \/><\/div><\/a><\/div>\n<div>There are two versions, the <a href=\"https:\/\/www.victronenergy.com\/panel-systems-remote-monitoring\/digital-multi-control-200-200a\" target=\"_blank\">Digital Multi Control<\/a> and the <a href=\"https:\/\/www.victronenergy.com\/panel-systems-remote-monitoring\/digital-multi-control-panel-gx\" target=\"_blank\">Digital Multi Control GX<\/a>.\u00a0 These are functionally identical but have a slightly different appearance, the GX version is designed to match the appearance of the <a href=\"https:\/\/www.victronenergy.com\/panel-systems-remote-monitoring\/color-control\" target=\"_blank\">Color Control GX<\/a>.\u00a0 The port is called a VE Bus port and the cable needed for this is the <a href=\"https:\/\/www.victronenergy.com\/cables\/rj45-utp-cable\" target=\"_blank\">RJ45 UTP<\/a> cable &#8211; also sold separately.\u00a0 It plugs into the position labelled &#8220;B&#8221; in the big drawing above (titled &#8216;Appendix A&#8217;) and in the photo at the end of this article.\u00a0 There are two adjacent sockets and you can plug it into either, they are identical.\u00a0 There are other things you can plug in there too including a parallel cable to connect multiple units or the new VE.Bus Bluetooth Dongle.\u00a0 Here is a photo showing two devices plugged in.<a href=\"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/image_147553832.png\" target=\"_blank\"><div class=\"full-size-image container\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-21538\" src=\"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/image_147553832.png\" alt=\"\" width=\"158\" height=\"212\" \/><\/div><\/a><\/div>\n<div><\/div>\n<\/div>\n<div>\n<h4>AC Case ground<\/h4>\n<div>There is a terminal for connecting an AC Case Ground.\u00a0 I wasn&#8217;t able to find any written reference to this in either of the other manuals.\u00a0 The ABYC does have some things to say about case grounds for Inverter\/Chargers though.<\/div>\n<div><a href=\"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/image_147553881.png\" target=\"_blank\"><div class=\"full-size-image container\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-21539\" src=\"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/image_147553881.png\" alt=\"\" width=\"361\" height=\"264\" srcset=\"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/image_147553881.png 361w, https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/image_147553881-300x219.png 300w\" sizes=\"auto, (max-width: 361px) 100vw, 361px\" \/><\/div><\/a><\/div>\n<\/div>\n<div>\n<h4>AC Output Connections<\/h4>\n<div>The MultiPlus 12\/3000 has dual AC Outputs.<\/div>\n<div><a href=\"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/image_147554102.png\" target=\"_blank\"><div class=\"full-size-image container\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-21541\" src=\"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/image_147554102.png\" alt=\"\" width=\"363\" height=\"263\" srcset=\"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/image_147554102.png 363w, https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/image_147554102-300x217.png 300w\" sizes=\"auto, (max-width: 363px) 100vw, 363px\" \/><\/div><\/a><\/div>\n<div>AC Output 1 is the main output.\u00a0 It supplies power regardless of whether shore or generator power is available or not and is the output on which the &#8216;PowerAssist&#8217; feature is available. PowerAssist\u00a0adds battery power to an AC source (shore or generator for example) when the on-board power demand would otherwise exceed the available current limit. AC Output 2 is only live when the MultiPlus is connected to an external AC source (eg. shore or generator). The thinking here is that by using AC Output 2 for non essential loads like water heaters, you&#8217;ll never accidentally drain the batteries if the generator or shore power fails. \u00a0Each output has terminals for Line, Neutral and Ground.\u00a0 The Ground output is shared between the two outputs.\u00a0 Here is a photo:<\/div>\n<div><a href=\"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/image_147554062.png\" target=\"_blank\"><div class=\"full-size-image container\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-21540\" src=\"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/image_147554062.png\" alt=\"\" width=\"181\" height=\"155\" \/><\/div><\/a><\/div>\n<\/div>\n<div><\/div>\n<div>AC Output 2 is limited to 32 Amps. \u00a0The Service manual details the recommended wire sizes based on a 50 Amp shore or generator input, see below.\u00a0 The output wires are sized to add the inverter&#8217;s PowerAssist amps to the shore or generator power available.\u00a0 For configurations with less than 50 Amp shore-power\/generator power or installations where PowerAssist is disabled it should be possible to reduce the necessary wire size by reference to the ABYC tables.<\/div>\n<div><a href=\"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/image_147554523.png\" target=\"_blank\"><div class=\"full-size-image container\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-21542\" src=\"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/image_147554523.png\" alt=\"\" width=\"570\" height=\"78\" srcset=\"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/image_147554523.png 570w, https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/image_147554523-300x41.png 300w\" sizes=\"auto, (max-width: 570px) 100vw, 570px\" \/><\/div><\/a><\/div>\n<div>\n<h4>AC Input Connections<\/h4>\n<div>The AC input terminals are on the extreme left and comprise a Line, Neutral and Ground terminal.\u00a0 Recommendations for wire size are shown in the table above and are based on a 50 Amp shore or generator supply.<\/div>\n<div><a href=\"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/image_147554525.png\" target=\"_blank\"><div class=\"full-size-image container\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-21543\" src=\"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/image_147554525.png\" alt=\"\" width=\"362\" height=\"262\" srcset=\"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/image_147554525.png 362w, https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/image_147554525-300x217.png 300w\" sizes=\"auto, (max-width: 362px) 100vw, 362px\" \/><\/div><\/a><\/div>\n<h4>Finishing the Installation<\/h4>\n<div>Before you put the panel back on you may want to check your work.\u00a0 Have you got the polarity right for the DC terminals? \u00a0Reverse polarity on these is a fatal error that will destroy the unit.\u00a0 Are the bolts tight?\u00a0 Have you mixed up your incoming and outgoing AC connections?\u00a0 Are those screws tight?\u00a0 Have you connected all the optional extra devices?\u00a0 There are also a few things you might like to look at before you close the lid so I have annotated the photo below with some notes.\u00a0 For most installations you will want to at least do some basic programming of this device.\u00a0 The most basic programming is done using the dipswitches and that requires the cover to be open.\u00a0 Anything more elaborate should be done using one of the computer interfaces available, such as <a href=\"https:\/\/www.victronenergy.com\/live\/drafts:veconfigure\" target=\"_blank\">VE Configure<\/a>. \u00a0You might also like to make a note of the model and serial number, and the processor number as these are all things you might need later and it&#8217;s a lot easier to write them down in the manual than it is to go and open up the unit again.\u00a0 In the photo below I used the same letter key as in the drawing earlier in the article.\u00a0 Below the photo is a list of what all these items are.<\/div>\n<div><a href=\"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/image_147554782.jpeg\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-large wp-image-21544\" src=\"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/image_147554782-1024x935.jpeg\" alt=\"\" width=\"1024\" height=\"935\" srcset=\"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/image_147554782-1024x935.jpeg 1024w, https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/image_147554782-750x685.jpeg 750w, https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/image_147554782-768x702.jpeg 768w, https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/image_147554782-300x274.jpeg 300w, https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/image_147554782.jpeg 1261w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/div>\n<\/div>\n<div><\/div>\n<div>\n<div>\n<p>A\u00a0 AC Input connections<\/p>\n<p>B\u00a0 VE.Bus ports for remote panel, parallel configurations etc. (Both ports are identical &#8211; you can use either or both.)<\/p>\n<\/div>\n<div>C\u00a0 AC Output 1 &#8211; this is the primary output<\/div>\n<div>D\u00a0 AC Output 2 &#8211; only works on shore power or generator and is limited to 32 Amps<\/div>\n<div>E\u00a0 Optional ports for temp sensor, voltage sensor, programmable options<\/div>\n<div>F\u00a0 DC negative connection (dual terminals available if double cables are used)<\/div>\n<div>G\u00a0 DC positive connection (dual terminals available)<\/div>\n<div>H\u00a0 Connector for remote switch (On, Off, Charger only)<\/div>\n<div>I\u00a0 \u00a0Programmable relay alarm contact.<\/div>\n<div>K\u00a0 On-Off Push buttons used in conjunction with dipswitches for basic programming<\/div>\n<div>M\u00a0 Dipswitches used for basic programming<\/div>\n<div>N\u00a0 Slide switches.\u00a0 Slide switch 1 is used for the ground relay function if the unit is connected to an autotransformer.\u00a0 Switch 2 is not currently used for anything.<\/div>\n<div>X\u00a0 Main Processor, make a note of the number in case a firmware update is ever needed (hint: take a photo)\u00a0 The first four digits of the processor number must match the first four digits of the firmware file name.<\/div>\n<div>Y\u00a0 Serial number and model number, make a note or take a photo.<\/div>\n<div>\n<div>All the above is taken from Appendix A of the service manual which has additional information on the functions of each item.<\/div>\n<\/div>\n<h4>Other versions of this MultiPlus<\/h4>\n<div>The 24 volt version of this should be almost identical (24\/3000)\u00a0 \u00a0The &#8220;<a href=\"https:\/\/www.victronenergy.com\/upload\/documents\/Datasheet-MultiPlus-inverter-charger--800VA-5kVA-EN-.pdf\" target=\"_blank\">Compact<\/a>&#8221; 12\/2000 MultiPlus is a bit different, it only has a single AC output and it has a greatly reduced number of terminals for optional connections.<\/div>\n<div>\n<h4>Quattros<\/h4>\n<\/div>\n<div>These photos are of\u00a0 a 48 Volt 5000 VA <a href=\"https:\/\/www.victronenergy.com\/inverters-chargers\/quattro\" target=\"_blank\">Quattro<\/a>.\u00a0 You can click on the thumbnail to enlarge the photos.\u00a0 The first one is the AC wiring area and the second is the DC wiring area and all the small connection points.<\/div>\n<div><a href=\"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/image_147554865.jpeg\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-large wp-image-21545\" src=\"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/image_147554865-768x1024.jpeg\" alt=\"\" width=\"768\" height=\"1024\" srcset=\"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/image_147554865-768x1024.jpeg 768w, https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/image_147554865-1500x2000.jpeg 1500w, https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/image_147554865-750x1000.jpeg 750w, https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/image_147554865-1152x1536.jpeg 1152w, https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/image_147554865-225x300.jpeg 225w, https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/image_147554865.jpeg 1536w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/><\/a><\/div>\n<\/div>\n<div><a href=\"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/image_147554870.jpeg\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-large wp-image-21546\" src=\"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/image_147554870-768x1024.jpeg\" alt=\"\" width=\"768\" height=\"1024\" srcset=\"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/image_147554870-768x1024.jpeg 768w, https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/image_147554870-1500x2000.jpeg 1500w, https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/image_147554870-750x1000.jpeg 750w, https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/image_147554870-1152x1536.jpeg 1152w, https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/image_147554870-225x300.jpeg 225w, https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2020\/10\/image_147554870.jpeg 1536w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/><\/a><\/div>\n<h4>User manuals<\/h4>\n<div>\n<div>The following manuals are available for the MultiPlus, I&#8217;m not sure which ones are in the box:<\/div>\n<div>\n<ul>\n<li><a href=\"https:\/\/www.victronenergy.com\/upload\/documents\/Quick-Install-Guide-MultiPlus-12V-24V-48V-3000VA-50A-EN_outlines.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">Quick Install Sheet<\/a>.<\/li>\n<li><a href=\"https:\/\/www.victronenergy.com\/upload\/documents\/User-Manual-MultiPlus-3k-120V-(firmware-xxxx4xx)-EN-ES.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">User Manual<\/a><\/li>\n<li><a href=\"https:\/\/www.victronenergy.com\/upload\/documents\/Service-Manual-MultiPlus-3k-120V-(firmware-xxxx4xx)-EN-ES.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">Service Manual<\/a>.<\/li>\n<\/ul>\n<\/div>\n<h4>Next steps<\/h4>\n<div><\/div>\n<div>Programming the MultiPlus is detailed in subsequent articles starting with this one about <a href=\"https:\/\/shop.pkys.com\/Multiplus-dipswitches.html\" target=\"_blank\">programming the MultiPlus using the dipswitches<\/a>.<\/div>\n<h4 id=\"ABYC\"><a href=\"https:\/\/abycinc.org\" target=\"_blank\">ABYC<\/a> NOTES<\/h4>\n<div>From\u00a0E-11\u00a0 AC &amp; DC ELECTRICAL SYSTEMS ON BOATS<\/div>\n<div><\/div>\n<div>ABYC 11.6.1.2.1 A battery switch shall be installed in the positive conductor(s) from each battery or battery bank with a CCA rating greater than 800 amperes or 100 Ah if CCA is unavailable.<\/div>\n<div><\/div>\n<div>11.10.1.4\u00a0 \u00a0Non-motor\u00a0 Loads\u00a0 &#8211; The\u00a0 current\u00a0 rating\u00a0 of\u00a0 the\u00a0 overcurrent\u00a0 protection\u00a0 device\u00a0 shall\u00a0 not\u00a0 exceed\u00a0 the\u00a0 maximum\u00a0 current-carrying capacity of the conductor being protected (see TABLES 6A-B). EXCEPTION: If there is not a standard current rating of the overcurrent protection device equal to 100% of the allowable\u00a0 current\u00a0 for\u00a0 the\u00a0 conductor\u00a0 in TABLES\u00a0 6A-B,\u00a0 the\u00a0 next\u00a0 larger\u00a0 standard\u00a0 current\u00a0 rating\u00a0 may\u00a0 be\u00a0 used,\u00a0 provided it does not exceed 150% of the current allowed by TABLES 6A-B.<\/div>\n<div><\/div>\n<div>11.14.1.2.8\u00a0 Paralleling of Conductors \u2013 conductors of #10 AWG and larger shall be permitted to be connected in parallel where\u00a0 the\u00a0 ampacity\u00a0 of\u00a0 each individual\u00a0 conductor\u00a0 is\u00a0 sufficient\u00a0 to\u00a0 carry\u00a0 the\u00a0 entire\u00a0 load\u00a0 current\u00a0 shared\u00a0 by\u00a0 the\u00a0 parallel\u00a0 conductors. NOTE:\u00a0 Paralleled\u00a0 conductors\u00a0 may\u00a0 be\u00a0 used\u00a0 to\u00a0 achieve\u00a0 the\u00a0 appropriate\u00a0 voltage\u00a0 drop\u00a0 or\u00a0 wire\u00a0 bend\u00a0 radius\u00a0 with\u00a0 smaller individual cables.<\/div>\n<div>11.14.1.2.8.1 Overcurrent protection of paralleled conductors shall be sized to protect a single conductor.<\/div>\n<div>11.14.1.2.8.2 Paralleled conductors shall be of the same length and gauge.<\/div>\n<div>11.14.1.2.8.3 Paralleled conductors shall be run together in the same cable, bundle, or raceway.<\/div>\n<div><\/div>\n<div>Here is a link to the <a href=\"https:\/\/shop.pkys.com\/Ampacity-Tables_b_43.html\" target=\"_blank\">Ampacity Tables<\/a> referred to above, in almost all cases we are using battery cable with 105\u00b0C insulation.\u00a0 According to the ABYC if you put a 400 amp fuse in the line then you have to use 4\/0 cable.\u00a0 Two times 2\/0, which has the same cross sectional area, doesn&#8217;t comply because the individual cable is not capable of carrying 400 Amps.\u00a0 I called them up at the ABYC to get some clarification on circuit protection for doubled-up cables.\u00a0 \u00a0You can use either one fuse or two if you have double cables, but in either case the fuse needs to be sized for what a single cable can carry.<\/div>\n<div><\/div>\n<div>\n<div>From\u00a0A-31 BATTERY CHARGERS AND INVERTERS<\/div>\n<p>MOUNTING<br \/>\n31.5.5.6\u00a0 To avoid corrosive fumes, battery chargers, inverters and inverter\/chargers shall not be installed directly over batteries.<\/p>\n<div>31.6.5 DC GROUNDING CONNECTIONS<br \/>\n31.6.5.1 The DC grounding conductor shall,<br \/>\n31.6.5.1.1 be connected from the metallic case or chassis, to the engine negative terminal or its bus, and<br \/>\n31.6.5.1.2\u00a0 \u00a0 \u00a0 shall be of an ampacity equal to that of the DC positive conductor.<br \/>\nEXCEPTION:\u00a0 The\u00a0 DC\u00a0 grounding\u00a0 conductor\u00a0 may\u00a0 be\u00a0 one\u00a0 size\u00a0 smaller\u00a0 than\u00a0 the\u00a0 minimum\u00a0 size\u00a0 conductor\u00a0 required for the DC current carrying conductors.<\/div>\n<\/div>\n<div><\/div>\n<\/div>\n<div>\n<div><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Peter Kennedy is an experienced Victron Dealer\/Installer specialising in Marine applications. His company website PKYS carries a useful guide to installing a MultiPlus Inverter. In it Peter adds a whole world of information to the Victron Energy MultiPlus installation manual. He discusses the practicalities of installing a MultiPlus Inverter in compliance with the standards of [&hellip;]<\/p>\n","protected":false},"author":10,"featured_media":21565,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[126],"tags":[],"class_list":["post-21521","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technical-articles"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to Install a MultiPlus Inverter\/Charger? - Victron Energy<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.victronenergy.com\/blog\/2020\/10\/30\/how-to-install-a-multiplus-inverter-charger\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to Install a MultiPlus Inverter\/Charger? - Victron Energy\" \/>\n<meta property=\"og:description\" content=\"Peter Kennedy is an experienced Victron Dealer\/Installer specialising in Marine applications. His company website PKYS carries a useful guide to installing a MultiPlus Inverter. In it Peter adds a whole world of information to the Victron Energy MultiPlus installation manual. 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