Hi. I am running 3x mecer axpert 5kv inverters in single phase. Running firmware 52.30. I bought 3 more inverters. Want to go 10kv x 3 phase. These inverters is running different firmware. I got the cables. What software do i need on my laptop and where do i get the firmware to to do the new 3 inverters to 52.30? Any info welcome. Thank you.

Running completely offgrid.

6x greenrich 3.7 batteries.

3 phase back up genie. Inverters pick up genie nicely and i can charge batteries from genie.

Running this system maybe 9 years.

Changed from agm to greenrich batteries about 4 years ago.

Probably best to check with the supplier that supplied the first three units and also with the supplier of the last three units. Hopefully the same supplier?

The models of the inverters typically need to be identical, and maybe they only updated firmware? on the 3 new ones? You may find the new inverters even though they look the same are not compatible with the already installed units? possibly due to changes of hardware internally, especially if they months or a year apart?

Maybe someone else can assist on the forum, but you would probably have to have to post the spec plate from one of the older and one of the newer inverters with respective versions of firmware installed on them for someone to be able to assist.

I had the same issue a few years back and had to buy 4 newer units and sell off the 3 older units, when i wanted to migrate to 4 x inverters for better generation. As firmware updating can brick your unit? The models were significantly different, and did not want to take the risk.

On 2025/10/29 at 8:04 PM, Boertjie. said:

Running firmware 52.30.

Presuming that these are 4 kW 5 kVA (there are other 52.30 firmwares, unfortunately), then your best option is to run 3 x 73.70e fully patched firmware (NOTE: do not run factory firmware version 73.00, 72.70 max). If your inverters aren't this old model, please post a photo of the barcode sticker.

Sorry for the very late reply.