Doing that has a good chance of frying the control section of the generator, according to SMA tech support.Has anyone had any negative feedback on generator problems when a solar system is backfed on the same panel being fed by the generator and there is no load being drawn on the panel with the generator running?
Many folks balk at doing that because they wish to keep harvesting energy from their PV system during a grid outage. It's risky, though.to prevent any issues you should make a tap on the line side of the ATS. so both the solar and utility feed are on the same side. only the CT's for the ATS are reading the utility feeders. when utility power goes off so does the Solar inverter. the ATS will transfer and run solely on back up power.
FWIW, my former instructor went on a service call for an SMA system with a Sunny Islander with all the bells and whistles. The complaint was that the batteries were not charging.If it's an SMA setup, look at the Sunny Island.
That or get something that doesn't require an entire extra set of inverters just to keep the first set of inverters working. SMA makes good kit, but it's miserable and complicated in a backup power configuration.