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Paul Carmichael avatar image
Paul Carmichael asked

VS with pylontech

Hello again all.

Tomorrow is the big day. Going to change over from FLA to 6 pylontech us3000c.

Quick question: do any of you use virtual switch with lithiums? I have a connection to another house which I've used as a backup for when we don't get much PV. If I want to do the same with the new batteries, what should the settings be? It's currently set for detecting voltage drop, as that is the obvious trigger using the FLAs.

Pylontechvirtual switch
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2 Answers
nickdb avatar image
nickdb answered ·

Why not use conditional AC control from victron connect?

Can connect on SOC which is more relevant with lithium, given the flatter voltage curve.

screenshot-2023-06-25-at-125913.png

screenshot-2023-06-25-at-125930.png


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Paul Carmichael avatar image Paul Carmichael commented ·

Looks remarkably similar to the VS. I presume those settings are the default, rather than suggested for me?

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Paul Carmichael avatar image Paul Carmichael commented ·

Just looked. Isn't victron connect the mobile app? I have to use ve configure to change the Quattro settings.

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Paul Carmichael avatar image Paul Carmichael commented ·

Cheers. I'm sort of used to making changes with veconfigure, but I'll take a look at this other setup. What is the recommended SOC to trigger connection?

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Paul Carmichael avatar image
Paul Carmichael answered ·

Thanks both. I live in the south of Spain, so not a massive issue. The FLAs have been a big headache though. Although I have 910ah, the battery has never gone below 80% because of the voltage drop. So I'm guessing, I should actually get more usable backup from the lithiums.

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Paul Carmichael avatar image Paul Carmichael commented ·
An update on FLAs. I've installed and commissioned the new pylontechs and disconnected the FLAS. It turns out that 2 of them are completely dead. I'm guessing they were letting current through so the other 22 cells were always being over charged. That would account for the noisy, and cloudy cells. I'm going to try to sell the good ones, although I don't know how long they might last.
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rithym1964 avatar image rithym1964 Paul Carmichael commented ·
Interested to know how long the FLA's had been in service before failing especially as you mention the bank has never gone below 80%, is that SOC or DOD?
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Paul Carmichael avatar image Paul Carmichael rithym1964 commented ·
Eight years. But when I dismantled the bank, I measured all cells. One was completely dead and I suspect it always was. It must have been short circuit so I've been overcharging all the rest all this time. One other had dropped to about 1.5v, but I'm guessing that was a result of the overcharging. I'm going to try to sell the "good" cells, but I don't know how long they'll last. At 50€ each, who cares? New ones cost 400€.
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