{"id":6884,"date":"2016-07-18T16:32:05","date_gmt":"2016-07-18T14:32:05","guid":{"rendered":"https:\/\/www.victronenergy.com\/blog\/?p=6884"},"modified":"2016-07-18T16:31:36","modified_gmt":"2016-07-18T14:31:36","slug":"phoenix-inverters-250-375-and-500va-dynamic-cut-off","status":"publish","type":"post","link":"https:\/\/www.victronenergy.com\/blog\/2016\/07\/18\/phoenix-inverters-250-375-and-500va-dynamic-cut-off\/","title":{"rendered":"Phoenix Inverters 250, 375 and 500VA – Dynamic Cut-off"},"content":{"rendered":"

Good afternoon!<\/p>\n

Recently released, but two weeks ago, is the new Phoenix Inverter VE.Direct firmware version v1.03, which besides a few internal changes, has a major new feature – the addition of Dynamic Cut-off. Some of you may know it from Hub-4. What it does is this: instead of using one fixed battery voltage as the low battery shutdown level, it also looks at the battery current. This makes sense, as we all know battery voltage drops when putting a load on it; caused by\u00a0the internal resistance of a battery bank.<\/p>\n

<\/p>\n

Previously you had to pick one voltage and enter that as the low voltage shutdown level, which would never be right. For example setting it to 10.5 V will do fine while powering significant loads.\u00a0However,\u00a0when left like that for a couple of weeks, without high loads, the inverter will keep on drawing power from the battery until it hits 10.5V, by which time a lead acid battery will have suffered damage as it has now been discharged too deeply. And putting it at 12V, which would be a nice cut-off value for a battery without load, won’t work either because as soon as you do put a load on the inverter it will shut down almost immediately.<\/p>\n

Dynamic Cut-off fixes this issue by using not only the battery voltage, but also the discharge current to determine the battery empty condition.<\/p>\n

During configuration, choose the battery type and enter the capacity of the battery bank. The type is necessary to select the right charge curve as not all batteries have the same internal resistance. The capacity is necessary because the current drawn needs to be put in perspective in relations to the size of the battery or battery bank. Perhaps to understand this more easily imagine a huge battery bank; a football field full of batteries. Now picture one small 250 VA inverter in the corner. Even loaded to full power, this inverter will not make the voltage of that huge bank drop one iota, as the load is negligible compared to the size of the bank.<\/p>\n

Here are the new settings shown in VictronConnect<\/a>:<\/p>\n

\"vc_iphone_phoenix_dynamiccutoff\"<\/a><\/p>\n

 <\/p>\n

Note, that although possible, it is not necessary to change the four Voltages. They will be automatically set to the optimum for the chosen battery type.<\/p>\n

Only for installations without other loads<\/h3>\n

Do not enable Dynamic Cut-off in an installation that also has other loads connected to the same battery: the battery voltage will drop because of the extra load, but the Dynamic Cut-off algorithm in the Inverter is not aware of that load: hence the Inverter will shut down too early; with an under voltage alarm.<\/p>\n

How to install the new firmware on your Inverter<\/h3>\n

Use our VictronConnect software<\/a>. Available for smartphones and tablets (iOS and Android) as well as Windows and Mac computers and laptops. Upon connection to the inverter, VicronConnect will automatically update the inverter to v1.03. Note that there is no need\u00a0to first obtain the new inverter firmware file, as VictronConnect already carries that with it.<\/p>\n

More technical background<\/h3>\n

The amount of voltage drop differs per battery type: OPzS and OPzV have a very high internal resistance, and therefore a large voltage drop; AGM and GEL batteries have a medium internal resistance, thus a medium voltage drop, and Lithium batteries have a low internal resistance: a small or even negligible voltage drop. This graph shows the curves used for each type of battery:<\/p>\n

\"dynamic_cutoff_12259377\"<\/div><\/a><\/p>\n

To find the cut-off voltage to be used for a certain discharge current; first calculate the discharge ratio. It\u00a0is defined as the battery current divided by the battery bank capacity. So for example, drawing 100A out of a 100Ah battery, results in a ratio of 1. Looking at the appropriate curve, this will result in a cut-off voltage of 12.3 V for a Lithium battery. And when the OPzS chemistry is chosen in the settings, drawing the same current will result in a much lower cut-off voltage: 10.4 V.<\/p>\n

For more details, see the Phoenix Inverter Dynamic Cut-off manual<\/a>.<\/p>\n

Best regards,<\/p>\n

Matthijs Vader<\/p>\n","protected":false},"excerpt":{"rendered":"

Good afternoon! Recently released, but two weeks ago, is the new Phoenix Inverter VE.Direct firmware version v1.03, which besides a few internal changes, has a major new feature – the addition of Dynamic Cut-off. Some of you may know it from Hub-4. What it does is this: instead of using one fixed battery voltage as […]<\/p>\n","protected":false},"author":4,"featured_media":6029,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[124],"tags":[],"class_list":["post-6884","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-firmware-software"],"acf":[],"yoast_head":"\nPhoenix Inverters 250, 375 and 500VA - Dynamic Cut-off - 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\/2016\/07\/18\/phoenix-inverters-250-375-and-500va-dynamic-cut-off\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Phoenix Inverters 250, 375 and 500VA - Dynamic Cut-off - Victron Energy\" \/>\n<meta property=\"og:description\" content=\"Good afternoon! 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Recently released, but two weeks ago, is the new Phoenix Inverter VE.Direct firmware version v1.03, which besides a few internal changes, has a major new feature \u2013 the addition of Dynamic Cut-off. Some of you may know it from Hub-4. What it does is this: instead of using one fixed battery voltage as [\u2026]","subtitle":null,"related_posts":[{"id":33057,"slug":"introducing-victron-microgrid","title":"Introducing Victron Microgrid","link":"https:\/\/www.victronenergy.com\/blog\/2026\/04\/13\/introducing-victron-microgrid\/","excerpt":"What if you could build large off-grid systems with the same simplicity as small ones - just by adding more independent units, increasing reliability, and scaling total capacity as you grow? Large off-grid systems have traditionally been complex to build and difficult to change; Victron Microgrid takes a different approach. Victron Microgrid allows multiple independent…","featured_image":"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2026\/04\/Victron-Microgrid-cover_319925212-150x150.png","author_name":"Guy Stewart","author_link":"https:\/\/www.victronenergy.com\/blog\/author\/guystewart\/","author_avatar":{"24":"https:\/\/secure.gravatar.com\/avatar\/46f1d045a4e399c7c754f765b33d48ca13b2ff31beca5a200d86e7c1d7b8d6d5?s=96&d=mm&r=g&s=24","48":"https:\/\/secure.gravatar.com\/avatar\/46f1d045a4e399c7c754f765b33d48ca13b2ff31beca5a200d86e7c1d7b8d6d5?s=96&d=mm&r=g&s=48","96":"https:\/\/secure.gravatar.com\/avatar\/46f1d045a4e399c7c754f765b33d48ca13b2ff31beca5a200d86e7c1d7b8d6d5?s=96&d=mm&r=g&s=96"},"categories":[{"name":"Firmware & Software","link":"https:\/\/www.victronenergy.com\/blog\/category\/firmware-software\/"},{"name":"News","link":"https:\/\/www.victronenergy.com\/blog\/category\/news\/"},{"name":"Products","link":"https:\/\/www.victronenergy.com\/blog\/category\/products\/"}],"date":"2026-04-13T13:15:09+02:00","date_gmt":"2026-04-13T11:15:09+00:00"},{"id":32812,"slug":"introducing-venus-os-3-70","title":"Introducing Venus OS 3.70","link":"https:\/\/www.victronenergy.com\/blog\/2026\/02\/25\/introducing-venus-os-3-70\/","excerpt":"Victron GX device firmware v3.70 is now available. This release brings a greatly expanded switch pane with Node-RED virtual switches, improvements to GX Boat Page and E-drive integrations, cell level monitoring for Lynx Smart BMS NG, Garmin EmpirBus digital switching, Shelly smart device integration, and much more. For a more visual overview and to see…","featured_image":"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2026\/02\/Venus-OS-3.70_315856177-150x150.png","author_name":"Matthijs Vader","author_link":"https:\/\/www.victronenergy.com\/blog\/author\/matthijs-victron\/","author_avatar":{"24":"https:\/\/secure.gravatar.com\/avatar\/04813a2afa21aa517530c3ceb326c13b89f3be8c3b094cee4f5f6266df5a5fdf?s=96&d=mm&r=g&s=24","48":"https:\/\/secure.gravatar.com\/avatar\/04813a2afa21aa517530c3ceb326c13b89f3be8c3b094cee4f5f6266df5a5fdf?s=96&d=mm&r=g&s=48","96":"https:\/\/secure.gravatar.com\/avatar\/04813a2afa21aa517530c3ceb326c13b89f3be8c3b094cee4f5f6266df5a5fdf?s=96&d=mm&r=g&s=96"},"categories":[{"name":"Firmware & Software","link":"https:\/\/www.victronenergy.com\/blog\/category\/firmware-software\/"}],"date":"2026-02-25T12:05:55+02:00","date_gmt":"2026-02-25T10:05:55+00:00"},{"id":32730,"slug":"victronconnect-app-v6-30","title":"VictronConnect App v6.30","link":"https:\/\/www.victronenergy.com\/blog\/2026\/02\/23\/victronconnect-app-v6-30\/","excerpt":"VictronConnect app v6.30 brings a range of new features designed to make system monitoring and management easier for both professionals and end-users. These include VRM integration, new tools for system monitoring, more insight during firmware updates, and a Batch Programming feature aimed at simplifying work for professionals. In the next sections, we take a closer…","featured_image":"https:\/\/www.victronenergy.com\/blog\/wp-content\/uploads\/sites\/10\/2026\/02\/Venus-OS-3.60-56_314584543-150x150.png","author_name":"Beril","author_link":"https:\/\/www.victronenergy.com\/blog\/author\/bberkem\/","author_avatar":{"24":"https:\/\/secure.gravatar.com\/avatar\/a18e95c9d838d5359f135ae704b95ae5d336e3c238b5aa877ef3a1e245c24b78?s=96&d=mm&r=g&s=24","48":"https:\/\/secure.gravatar.com\/avatar\/a18e95c9d838d5359f135ae704b95ae5d336e3c238b5aa877ef3a1e245c24b78?s=96&d=mm&r=g&s=48","96":"https:\/\/secure.gravatar.com\/avatar\/a18e95c9d838d5359f135ae704b95ae5d336e3c238b5aa877ef3a1e245c24b78?s=96&d=mm&r=g&s=96"},"categories":[{"name":"Firmware & Software","link":"https:\/\/www.victronenergy.com\/blog\/category\/firmware-software\/"},{"name":"News","link":"https:\/\/www.victronenergy.com\/blog\/category\/news\/"}],"date":"2026-02-23T16:25:50+02:00","date_gmt":"2026-02-23T14:25:50+00:00"}],"_links":{"self":[{"href":"https:\/\/www.victronenergy.com\/blog\/wp-json\/wp\/v2\/posts\/6884","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.victronenergy.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.victronenergy.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.victronenergy.com\/blog\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.victronenergy.com\/blog\/wp-json\/wp\/v2\/comments?post=6884"}],"version-history":[{"count":21,"href":"https:\/\/www.victronenergy.com\/blog\/wp-json\/wp\/v2\/posts\/6884\/revisions"}],"predecessor-version":[{"id":7033,"href":"https:\/\/www.victronenergy.com\/blog\/wp-json\/wp\/v2\/posts\/6884\/revisions\/7033"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.victronenergy.com\/blog\/wp-json\/wp\/v2\/media\/6029"}],"wp:attachment":[{"href":"https:\/\/www.victronenergy.com\/blog\/wp-json\/wp\/v2\/media?parent=6884"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.victronenergy.com\/blog\/wp-json\/wp\/v2\/categories?post=6884"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.victronenergy.com\/blog\/wp-json\/wp\/v2\/tags?post=6884"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}