Hi everyone. 

Hope you can help? 

I'm having a bit of an argument with my installer on a setting and would appreciate it If someone can settle it. 

Am installing 3 Pylontech US3000C batteries. 

 

Installer has inserted battery capacity as 111Ah and I am saying it should be 222Ah?

He says any higher than 111 could damage the battery

 

Not even sure if it makes any difference as the battery can communicate with the inverter?

 

Thanks for the help! 

Mark 

Maybe need to be a bit more precise on the units. It's possible that you and the installer are talking past each other.

The installed battery capacity is 222Ah (Amp-hours) (at +/-48V). This value doesn't change. It's the size of your "storage tank."

It's probably more likely that your installer is saying that the battery discharge rate should be limited to 111A of current (Ampere), since these are 0.5C batteries. The typical specs for this type of battery say you can reach higher discharge rates like for example 150A if you had to, but that it's not ideal for regular ongoing operation. You could shorten the battery life. I'm just repeating the typical battery manufacturer's info, and it's probable that the installer is playing it safe and doing the same.

What type of inverter have you got? If it's something like a Deye, personally I'd set the work-mode power to the lower value, say 5000W discharge for normal operation like daily cycling, but then allow the battery to drain more quickly in the unlikely emergency event of a power outage.

Thanks for the response. 

See attached for exact setting. 

I have now set to 222Ah.

Inverter is 8kw Sunsynk. 

13 hours ago, Mark M said:

Thanks for the response. 

See attached for exact setting. 

I have now set to 222Ah.

Inverter is 8kw Sunsynk. 

That is fine. I'd suggest to increase the discharge amps to 111A, and the charge amps can even be a bit lower, say 80A. The current 40A is almost too low to be practical, though some might say that's the way it should be to protect the battery.