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ATS Function: a. when switch to ATS function, then: for 24v system, your bty voltage when 21.5v, will auto switch to ATS mode, means inverter will auto switch the home power to provide the 110v AC output & charge your bty at the same time. After charge your bty to 28v,will be back to inverter mode.(PS.AC input cable need plug in all the time)
ATS Function: b.if you are using solar system, then you need stay at ATS function , because in the day time, all the power come from solar, after night time or bty under 21.5V, will auto switch to home power, will let your electric products keep working, until day the sun come on again, then will be back to inverter mode again.
UPS function: If you switch to UPS function, when you plug ac power cord, then the power will come from your home power source, no matter load or charge your bty. In this moment, will not spend your bty bank power.