Double voltage, voltage swap and no charge

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Béci Kovács asked Mar 25, '23

Double voltage, voltage swap and no charge

Hi,

I have 5 Victron Energy SmartSolar Charger MPPT 100/20. They are charging the same LifePO4 battery. The battery preset is set to Smart Litium preset. They work together in VE Smart networking.

Two of these chargers are not charging now for a couple of days. By checking one of the charge controllers it seems to be a software issue (regarding that two different voltage should not appear in the same moment).

Disconnecting PVs and the battery didn't help. Reset to default didn't help. Leaving the network also wasn't the solution.

The PV voltage is always just under the battery voltage, but if I use a multimeter the voltage should be fine (e.g. 25V in the software instead of 30V measured).

Does anyone has any idea?

Thanks in advance!

MPPT Controllers MPPT SmartSolar

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Answer 1 · 2023-03-25T08:38:53Z

Trevor Bird answered · Mar 25, 2023 at 08:38 AM

@Béci Kovács The solar voltage seems too low to me. We set lithium absorption voltage on certain batteries to 29.2 volts. Having a solar terminal voltage of 30 volts is simply not enough. Perhaps the controllers are smart enough to know that if they all engage none of them can charge because the terminal voltage of the solar panels drops too far.

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Béci Kovács commented · Mar 25, 2023 at 09:51 AM

Thank you for the answer! I'm gonna try to raise the absorbtion voltage, but i have the same other mppts on the very same battery and they do their jobs with the same settings. The solar 'strings' are located in the same angles beside eachother. On the first screenshot it seems that the controller mix up the solar and battery voltage. So I don't know how to reset the controller. Now I disconnected it fully and wait a couple days to rejoin.

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