Good day everyone. 

I'm Lourens and I'm new to this forum. 

I need some advice if possible. I have 2 x Fivestar 8kVA inverters connected in parallel with 2 x 5.12kW lithium batteries also connected in parallel. 

When on battery power and I switch on a kettle or microwave, both inverters will trip simultaneously after 2 seconds giving me error code 08. When on AC power, no trips occur.

Any advise would be much appreciated. 

11 hours ago, Lourens1975 said:

error code 08

That's warning code 08; the warning symbol ⚠ is showing, and the fault LED is off or flashing.

The first manual I came across didn't mention this code; a quick look at one firmware indicates that it may be temperature related (although warning code 02 is for over-temperature). It's also weird how the internal representation isn't what gets displayed, and there is also the display firmware to contend with. Hopefully you have the correct manual to look this up.

Hey Coulomb

The booklet that came with this inverter states is a "Soft Start Fail". It literally trips 2 seconds after starting a microwave or kettle. The fridges, washing machine etc works fine and it only happens in battery mode. I just cannot believe that both inverters failed at the same time.

1 hour ago, Lourens1975 said:

The booklet that came with this inverter states is a "Soft Start Fail".

That's something that happens at start-up, and is a fault not a warning. Are you sure you're not looking in the fault section? The warnings should be separate.

I've looked in one of my better commented disassemblies; the only warnings that can appear are 01, 02, 04, 07, and 10. So this warning code must be unique to this clone / work-alike.

Edit: I've just noticed that there is leading zero suppression on the warning code. That's another indication that it's not Voltronic firmware.

1 hour ago, Lourens1975 said:

It literally trips 2 seconds after starting a microwave or kettle.

That sounds too quick to be temperature related. What is the battery voltage showing? My guess is that the battery can't take the load, and is disconnecting or possibly just sagging too much in voltage. It might be best to put a multimeter across the battery terminals.

Is the battery cable at least 25 mm² in copper cross sectional area? If not, that could be part of the problem.

A photo of the system might help; perhaps the battery cables are not properly diagonal takeoff, or the inverters or battery modules are daisy chained.

Edited January 21, 20251 yr by Coulomb

I will take some pics of the booklet showing the codes this afternoon as well as the battery system cables etc. Batteries (2 x 5.12KW lithium parallel connected) are fully charged and sitting at 56.7 Volts each. Battery cables are 35mm2. Attach is how I connected them. Cables same length. Unfortunately, I'm not too clued up with inverters and Iive in a remote area so not a lot of installers are prepared to come and check. So, I'm stuck with me, myself and I to figure this out.

Coulomb

Do you perhaps have a diagram for the BMS communication between the Fivestar inverters and the Ecco batteries? 

The dip switches are set like this: Master batt - 1up rest down and slave is 1down2up3down4down. Is this correct?

I think I got the problem sorted this afternoon. The BLC Setting is not mentioned in the manual. It was set at 20A. I set it up to 50A, and voila. Everything works. Seems like it comes factory at 20A. 

Not sure what the correct setting should be.

 

Thanks for all your help. Much appreciated.

On 2025/01/21 at 10:49 PM, Lourens1975 said:

Do you perhaps have a diagram for the BMS communication between the Fivestar inverters and the Ecco batteries? 

Sorry, I have no experience with these fancy factory BMS batteries. I also have no idea what the BLC setting might be for.

On 2025/01/21 at 10:40 PM, Lourens1975 said:

Batteries (2 x 5.12 kWh lithium parallel connected) are fully charged and sitting at 56.7 Volts each. Battery cables are 35 mm². Attach is how I connected them. Cables same length.

That all looks good.