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I am using a Multiplus IIGX 3000/48 as a UPS (Australia). I also have house grid connected SunnyBoy PV 1.5kw. If I use the PV Inverter Support Assistant will a) the PV inverter feed to the grid through the MPII when connected to AC out1 and b) provide PV AC to critical loads when the grid is down and c) when the grid is down, protect the battery from overcharging. I'm not sure if I should use this assistant or ESS. I am not trying to timeshift energy usage, just provide a reliable UPS. David
ESS if grid connected. The manual says it frequency shifts. I don't personally use SMA so can't confirm.
PV assistant for off grid. With this one, if you connect a grid source or generator the PV ramps down to no production.
See the manual here on AC coupled systems.
SMA don't have a great amount of support, so you may find yourself scouring the forum more. There is a short set up page here for communication.
Thanks Alexandra. Looks like ESS with "Keep Batteries Charged" is the closest setting to UPS.
