Viewing posts with category: Technical articles

Connecting different sized Victron Energy PV modules: Series or Parallel?

Most Victron Energy technical questions are answered by Victron Energy dealers or by contacting Victron Energy customer service on +31(0)36 5359703 or emailing them at  service@victronenergy.com. Others get answered here on the blog and on Victron Live, using the Disqus comments section.

Sometimes the sales team receive them directly too. Here is one question received by Bob Hopman about whether you can place different sized Victron Energy PV modules together and whether series or parallel is best. I found this one interesting, hence a short blog.

John Rushworth

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Motor Yacht Matsko: Quiet, inexpensive energy

Shrack Logo

Introduction

We were recently contacted by Josip Zdenković, a Director of SCHRACK TECHNIK Ltd in Croatia, who submitted a comprehensive technical article concerning the use of Victron Energy equipment on-board the vessel Matsko, shown in the headline image above.

Here then in Josip’s s own words (translated from Croatian) is his detailed article about their project. Project assistance was provided by Josip Radin, also from SCHRACK TECHNIK, who was a co-worker on the project.

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Batteries: Lithium-ion vs AGM

In light of my last post concerning the use of the DC or Hybrid concept for electrical power, it occurred to me that the system could also have used monobloc AGM/Gel batteries or indeed a bank of long life 2 volt gel cells. In that case why was Lithium chosen? Hopefully this post may go some way to highlighting that decision process.

Across all markets over recent years Lithium-ion batteries have been gaining in traction [sic]. To the uninitiated it is easy to dismiss Lithium-ion as an expensive alternative to VRLA (valve regulated lead acid) technologies such as AGM (absorbed glass mat), if simply looking at the amp-hour (Ah) rating. This was the initial mistake I made a few years back. Digging deeper it became clear to me that there is a lot more than Ah ratings to consider, when choosing the best batteries for your application.Continue reading

Which solar charge controller: PWM or MPPT?

Which solar charge controller: PWM or MPPT?

What follows is a summary of our white paper with the same title.

For the full white paper, see: Which solar charge controller: PWM or MPPT? in the White papers section of our site.

1. What they do

The PWM controller is in essence a switch that connects a solar array to a battery. The result is that the voltage of the array will be pulled down to near that of the battery.

The MPPT controller is more sophisticated (and more expensive): it will adjust its input voltage to harvest the maximum power from the solar array and then transform this power to supply the varying voltage requirement, of the battery plus load. Thus, it essentially decouples the array and battery voltages so that there can be, for example, a 12 volt battery on one side of the MPPT charge controller and a large number of cells wired in series to produce 36 volts on the other.

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