Sudden system shutdown

sundug · Jan 4, 2023

I have two of the SPF 3000 TL LMV inverters, set up for split phase with utility backup.I have two signature solar 24-volt life power 4 batteries. Everything had been working well until recently. The other day suddenly all output stopped and I got a low battery message 04 and I got a BMS Message 20. I rewired my loads back to utility, and even though the battery was showing two LEDs and 26.4 volts, I put a charger on them for a while. Now whenever I try to start the system up, the batteries immediately go to alarm and nothing starts on the inverters. Neither of the circuit breakers has popped and I don't know what else to do. Please advise.

Casteil · Jan 4, 2023

Is your Battery Type setting "LI"? If so, check your BMS communication; ensure your LifePower4's dip switches are set correctly with your battery configuration.

This is the same sequence of errors I got before getting BMS communication between the LifePower4 and SPF 3000TL working correctly.

You might be able to 'bandaid' this problem temporarily by setting the inverter's Battery Type setting to "user defined":

What's likely happening here is that your inverter's getting 'bad' (or no) voltage reads from your battery due to a BMS communication failure.. so it's not trying to kick on.

sundug · Jan 4, 2023

Casteil said:
Is your Battery Type setting "LI"? If so, check your BMS communication; ensure your LifePower4's dip switches are set correctly with your battery configuration.

This is the same sequence of errors I got before getting BMS communication between the LifePower4 and SPF 3000TL working correctly.

You might be able to 'bandaid' this problem temporarily by setting the inverter's Battery Type setting to "user defined":
View attachment 127938

What's likely happening here is that your inverter's getting 'bad' (or no) voltage reads from your battery due to a BMS communication failure.. so it's not trying to kick on.

sundug · Jan 4, 2023

Thank you for your prompt reply.The battery type setting was at Li, However I cannot get the inverters to turn on to change any settings.I don't know how to check BMS communication other than the cables, which are fine. What should the dip switch settings be?

Casteil · Jan 4, 2023

sundug said:
Thank you for your prompt reply.The battery type setting was at Li, However I cannot get the inverters to turn on to change any settings.I don't know how to check BMS communication other than the cables, which are fine. What should the dip switch settings be?

Can't say for sure, mine's a different config with just one LifePower4, so all my dip switches are off.

I think for multiple LifePower4s you might have to have the "Master" battery (the one with the BMS cable connected to the inverter) with the first dip switch on, then the second battery with the second dipswitch on... but don't quote me on that. Could be all off for the "master" battery. There are youtube videos that cover settings, also some posts here... but I don't have links for them handy

sundug · Jan 4, 2023

I got the inverters to start up by having the inverters on, the battery disconnect on, and then finally turning the battery circuit breakers on. So far it seems to be working properly, but I wonder what caused the fault in the first place, and how to prevent it from happening again.

Sudden system shutdown

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