On 2023/11/21 at 9:05 PM, zsde said:

Set your bulk and float both to 53,6V. If that Inverter has been set to those voltages and the BMS actually didn't stop the charge at 53,6V, then the cells may have been affected already.
You can set your PV charging to 50A without concern. This is a 1C battery so in a Li BMS mode environment it will auto set to 100A charge in any case if the Inverter was capable.
In your case just manually set it to 50A. 

Thanks, if I look at the logs the battery has peaked at 56.4V yesterday, so I'll definitely turn this down. Looks like it was set to AGM mode rather than user mode.  

On 2023/11/21 at 9:26 PM, Buyeye said:

60A is only 3000 watts when charging a 48v battery.  The inverter is probably cutting the solar at midday because the battery is full and there is nowhere for the electricity to go.

I can't comment on the battery voltages.

The odd thing is that it wasn't just cutting solar charging, but the full solar input and running on battery instead, in the middle of the day with clear skies. When I set the charging to 20A the normal solar input also recovered. 

On 2023/11/21 at 9:38 PM, PowerUser said:

@JVS use Hubble recommend setting for the AM-2 with your Axpert inverter:

https://www.hubblelithium.co.za/axpert

Thanks. I saw this but wasn't sure if I should use this or the values printed on the battery lable. 

On 2023/11/22 at 6:53 AM, PsyWulf said:

Currently Hubble recommends 53.8 as the Cutoffs on the AM2 in voltage mode

 

This wording doesn't make sense. If the batteries are full they won't take charge anymore,if you lower the max solar charge rate they'll charge slower for longer - that's it. If there is no load to load and no battery to charge PV will drop to match the usage

Agreed. This is what baffles me. I've set my Watchpower to 1s refresh rate, and as soon as it hits 31A it cuts off both the solar charging and solar input power, and switches to battery. I can even hear it switching if I stand next to it. Then when it recovers, it ramps up the amps again, and falls back again. Rinse repeat. When I set it 20A it stabilised. 

On 2023/11/21 at 8:24 PM, JVS said:

Having recently moved into a place with an Axpert MKS 5KW inverter and a Hubble AM-2 5.5KW battery, I noticed this thread while going through the settings. 

On the battery sticker the float and equilised voltages are shown as 52.6Vdc and 53.6Vdc respectively, but the inverter has been set to 54V and 56.4. Should I change this to match the battery sticker? The other issue I had was that the PV charging was set to max 60A, but when I enabled SBU (it's been running in utility mode all along) the inverted started dropping the PV input by mid-day. I then changed this down to 20A to get a stable PV charge. The inverter is supposed to be able to handle 80A solar charge, but I'm not sure if this is due to battery limitations or incorrect settings. Any input appreciated, thanks. 

So I've corrected the bulk and float voltage settings (thanks all) and I'm now getting a stable 35A charge from PV in midday. After sunset it stays on battery as per my SBU setting until it reaches the 'back to charge' voltage and switches over to AC. What I've noticed now that instead of keeping the battery full for the night on AC, it starts discharging again. My 'back to discharge' voltage is still at 54V, which it's no longer supposed to reach. Due to stage 6 shedding, I keep my 'back to charge' voltage at 51V, but now it keeps on switching between AC and battery about every 20 minutes. Is this the nature of SBU, or is there a way to keep it on AC without switching to battery, till PV starts taking over? I haven't seen it doing this until I fixed the float and bulk voltages. Thanks again.