The last few days I've been monitoring my sytem a bit having good sunlight just wanting to make sure all is well.

What I came across is alarming.

Keeping in mind that my inverters were set to the recomended 53,2 volt for Charging and float of Pylontech batteries I found that the voltage would actually creep up and cause OV logs using multisibcontrol.

I proceeded to reduce the voltage to 53,0v yesterday and were still logging High Voltage logs.

This morning I changed it 52,8 Volt. Although not logging anymore alarms it still managed to climb to 53,535 volts.

Just shows you how important it is to double check that your system is happy.

I think I'll be dropping it another 0.3 volts to 52,5 just to be on the save side.

Did anyone else experience this with propper Axpert inverters

I added a few logs to show whats going on.

My Axpert clone is on the other side of the fence. It never reaches the set point for bulk and the current drop very low at the time it moves to float.

This actually suits me to not charge to over 90% SOC. I still get a high capacity use from my lithiums.

38 minutes ago, Scorp007 said:

My Axpert clone is on the other side of the fence. It never reaches the set point for bulk and the current drop very low at the time it moves to float.

This actually suits me to not charge to over 90% SOC. I still get a high capacity use from my lithiums.

Yours is the safer side of things cause Im sure that if a person ever has warranty claim and you were over volting the battery constantly the warranty would be void.

I dropped my settings to 52,5v now .The weather man says I'm in for some rain for a few days so will have to wait and see where I end up Charge wise.

I have my genuine Axpert set to 52.5V and have zero issues or alarms. Going nearly 3 years. In the beginning I had it at 53.5V and had a few OV alarms. But since the drop to 52.5V no alarms and batteries goes to 100% each day. 

Also running at 52.5v and charge to 100%.State of health 97% after 32 months. Axpert combined with Epever Mppt set at 52v. 

On 2022/04/07 at 11:25 PM, Piper said:

I think I'll be dropping it another 0.3 volts to 52,5 just to be on the save side.

That's the magic number that other Axpert and Pylontech owners have come up with.

Edited April 8, 20224 yr by Coulomb

2 hours ago, Coulomb said:

That's the magic number that other Axpert and Pylontech owners have come up with.

I should spend more time reading other peoples posts.D'OH!

11 hours ago, Chris Louw said:

Also running at 52.5v and charge to 100%.State of health 97% after 32 months. Axpert combined with Epever Mppt set at 52v. 

Chris could you perhaps explain your setup using the Epever with the Axpert MPPT.

Installed 1500Watt panels with Epever 30A mppt for extra capacity. Axpert and Epever connected to busbar with Pylontech battery's. Solar Assistant installed for control. Epever has it's own Lithuim charging program and is set to stop charging at 52v.

1 hour ago, Chris Louw said:

Installed 1500Watt panels with Epever 30A mppt for extra capacity. Axpert and Epever connected to busbar with Pylontech battery's. Solar Assistant installed for control. Epever has it's own Lithuim charging program and is set to stop charging at 52v.

Thanks Chris. Interesting how your increased the charge rate with own panels via the Epever.

Piper, did you ever have the battery beep/alarm and all lights flashing?

I once discussed this with Pylontech by email as I mentioned in the thread: I will paste below the email exchange.

PYLONTECH: "please set the following parameters that are on the battery side.........:
Bulk charge voltage 52.5V.
Float charge voltage 52.5V."

ME:"If float charging voltage of 52.5V is OK, then I guess a lower float voltage 51.0V or 52.0V might be OK for charging to less than 100%. But never >52.5V. Do you agree?"

PYLONTECH: "That's correct! Because sometimes the voltage sensors on the inverter terminals are not very accurate, the full battery voltage is around 53.2V(smaller than 54V). So 52.5V is a charge voltage value that has been limited in a safe range! You do not need to worry about this.

Hi Green Power

I did not have a beep/alarm and only the ALM Red Led turned on.I assume that it was not such a serious over-voltage.

I did however reduce my charge rate to 52,5v (both bulk and float ) as I mentioned above and can confirm that my system has been running like charm for the last week or so with no alarm logs or indications so I'm happy keeping it where it is at the moment.