Is there a solution for a "ER24" for this same inverter?

Hi I bought some sunny roo inverters in auction. 12 of them to be precise. Unfortunately they do not come with installation guides but they are brand new. I am looking for a way to tie them to an off grid installation to help for outdoor events. the model i have is the SR3000TL. and it only has one AC inline port. I am finding it hard to believe you should connect the it in Parallel to the out put of the off grid ac and the load. Please any help you can offer would be appreciated

If you look the power boards, they are black because of the glue. They use glue to fix the parts, because of the poor soldering. The degradation of the components are planned, so the board is not repairable. You can only completely swap it, which is not environment friendly strategy. So I prefer not to buy that type of fronius inverter.

Qualcuno mi può spiegare errore 22 che significa

component level repairs can be done here in the Blue Mountains in NSW