Hello,

Please advise.

I have 2x Axpert King II in parallel connection monitored and controlled via Sollar Assistant.

Can King work in parallel connection via bypass?

When I had 1x King I was able to switch to ECO mode via Assistant and the inverter switched to bypass. Now when I added another King in parallel it doesn't work - I switch to ECO mode but the bypass doesn't turn on.

Thanks for the answer.

I stand to be corrected, but the 1 inverter must be a master and the other 1 a slave in parallel mode. The slave follows the master's commands. Is your setup like that and which inverter receive the ECO command ?

yes I have Master and Slave

I can send ECO command to both Master and Slave

I sent ECO via SollarAssistant to the Master inverter

Result:

Master - ECO

Slave - ECO

Bypass did not switch

I sent AUT via SollarAssistant to the Master inverter

Result:

Master - AUT

Slave - ECO

I had to switch to AUT in the Slave via the display panel

could a different U2 software do this too?

Edited September 17, 2025Sep 17 by Vlado

By default I work in SBU mode

I sent the SUB command via SollarAssistant to the Master

The Master and Slave started working in SUB mode - that's fine

I sent the SBU command via SollarAssistant to the Master

The Master and Slave continued to work in SUB mode but the display showed that they were in SBU mode - I don't understand why

I turned off and then turned on the 230V supply circuit breaker to the Master and Slave and only now they started working in SBU mode

On 2025/09/15 at 10:23 PM, Vlado said:

When I had 1x King I was able to switch to ECO mode via Assistant and the inverter switched to bypass.

There is some functionality, I think to do with ECO mode, that goes away when Kings are paralleled. Read the manual carefully, in the section describing each setting.

That's exactly what I thought, but after reading the manual I couldn't find anything - so I'll try again, maybe I overlooked something

Is it normal for the batteries to run out in SUB mode?