I noticed strange thing, which happens sometimes. After battery is 100% charged, excess DC coupled PV is supposed to be feed-in to grid. But actually PV charger just stops generating. For example now is plenty of sun, and charger is idle. Anybody able to help? Thanks! installation # 442946 [im…

Hi @kbb The cause of this is your lithium battery BMS not complying with the Victron BMS-can specification. Compatible batteries are listed here - Battery Compatibility [Victron Energy] Further details why The specification requires that BMS use the Charge Voltage Limit (CVL) not the Charge Curr…

@guystewart Thanks for answer! First of all, at ~12:00 CCL went to half, not to zero. Second, why MPPT resumed to generate at ~17:00? As you can see from BMS graph, nothing changed at that time.

It’s not a perfect science there, multiple variables, control loops, and the MPPT is getting a mixed message (export, but don’t charge), but that is definitely the cause and the effect. We haven’t invested more time into troubleshooting and improving it further, when there is a clear solution avail…

@guystewart Unfortunately it is impossible to persuade Basen Green (Battery manufacturer) to adjust BMS behavior to follow Victron regulations. I tried several times, they just answer that everything is correct. I suppose market is full of batteries and BMS’es, which operate same way and will neve…

[image] Guy Stewart (Victron Community Manager): We haven’t invested more time into troubleshooting and improving it further, when there is a clear solution available that works perfect. It’s a far more stable and consistently performing system when the CVL is used to regulate A lot of new (…

[image] Konstantin Barinov: Is there any possibility to fix this somehow in Node Red or with scripts, DIY way? It’s possible but strongly strongly discouraged. Relevant first step is the “quirks” section of the VenusOS source code, specifically the DVCC.py This thread is not specifically ab…

[image] Alex Pescaru: I know that, sometimes, it’s better with CVL and also suits your hardware better, but the industry sometimes has different ways than Victron way… Famous words (not mine): He who’ll not adapt, will die… In this case Victron’s way is better, not just for our hardware, but…

Probably you’re right, as long as you (as company) keep insisting to keep things separate and modular – mppt, inverters, etc. But as you already observed - and adapted (see MultiRS) - the industry is moving towards AIO systems. And there, because of the hardware implementation, is much, much easie…

[image] Guy Stewart (Victron Community Manager): To perhaps help you with Basen, here is an extract from the BMS-Can specification that clearly states the requirement. I am going to presume they have never read it, because it’s not possible to have and also say everything is correct. I also s…

MPPT Charger stops generating, excess DC PV not being feed-in

DIY

kbb (Konstantin Barinov) 27 May 2025 15:16 2

Update, at ~17:00 MPPT charger started to generate again.

Export from DC-side PV stops when battery is full

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MPPT Charger stops generating, excess DC PV not being feed-in

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