Im doing a transformer based ups system, when i measure the voltage across load and battery im getting some weird graph for load which goes till 800 v and for battery is 52v

i hv made a transformer based ups where i hv a ac sourve connected to universal bridge (rectifier ) through a step down transformer to a battery to a inverter then this is step up to load . i also hv breakers so that i can show mains on amd off conditions . now when i measure the voltage across the load it is not a sine wave something tht goes till 800 v also the voltage across the battery is constant 52 but i stepped down the transformer to only 48 v i dont see and charging or discharging

[Sabin]

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