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johanmeijer / grott

Growatt inverter monitor
https://github.com/johanmeijer/grott/wiki
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BMS error 304 #510

Closed PedroKTFC closed 5 months ago

PedroKTFC commented 5 months ago

I know this isn't a Grott issue but I'm hoping someone can help. Last night my system came up with this error (and Grott shows System Fault Word 3 with 33024, all other fault words are 0). My battery no longer seems to report any updates - it's stuck at 33%. Has anyone else seen this? Any idea how to resolve? (I'm in touch with my installer but so far no suggestions from them.)

johanmeijer commented 5 months ago

This is from the Growatt protocol (only in older documentation described) description:

image

33024 decimal, is 8100 hex, is 1000 0001 0000 0000 binary.

Your bit 0 and 7 seems to be set. 7 is reserved. Bit 0 says: BatTerminalReversed. Does this helps? Have you switched the connections?

PedroKTFC commented 5 months ago

Thanks for that. I'll try and look in the documentation I have so I can work it out next time. However, just as it came without warning, it's now cleared up without warning too! I have no idea what caused it. It happened at around 2:30am. I wonder if something got too cold (it was very very cold last night)? I've done nothing (I'm away just now) other than played with a version of grottserver I'm working on that reads all the registers in one (repeated!) go and displays them on the web page.

PedroKTFC commented 5 months ago

Looks like it was the cold! Here's what my installer sent me a little while ago:

Thankyou for the information. I have had the manufacturer technician investigate this and they have concluded that the only other explanation is that due to the batteries being of lithium make, they have a temperature safety net whereby if the battery temperature drops below 0 degrees, it will automatically stop charging and discharging. It will automatically self-resolve once the temperature rises again.