I am using an older Heart Interface Freedom Combi Inverter/Charger. The model is Freedom 25 which is a 2500 watt unit. This unit has a three stage 130 amp charger. I have been running this for a couple of weeks now and have had no problems yet. I placed a temporary 110v GFCI to test from. I have run some short time tests of the inverter and it has preformed as expected. I have not finished the new shack that will use this backup power yet. There is a lot of work to be done to convert a building to a nice shack, and of course the job and work around the house seems to always get in the way! If this system works as planned I may have to expand and get a newer controller. I am also interested in solar. It would be possible to run the whole shack off grid. This is a future project.