Art_Baxtr wrote:I just picked up a used APC 1500 SmartUPS and wired two deep cycle batteries to it for a backup power solution for the winter. I don't know what the time range will be yep because I haven't been able to run it through a full test. The only real consideration I was worried about was how smart the UPS was that I used. Some of the cheaper models for home use only have trickle chargers as opposed to Float chargers, so that is why i went with a 1500 SmartUPS. Other than that i don't have any worries about the setup, just really curious to see how long of a draw i can place on it. Total cost was under $200 for the setup. Well worth it in my opinion.
Probably 1500 volt amps for 5 minutes and 1200VA continuous. Wattage maybe 1000-1100 continuous? It's up to the amp hour capacity of the batteries for how long they last. Inverter vender's list capacity in both large and small print.
Don't expect to obtain 2000 amp hours from a battery pack rated at 2000amp hours on a continuous high draw. You will obtain 1/2 to 2/3 capacity and some very hot batteries and hydrogen gas floating around.
Lead acid gel cells in particular take a beating with high discharge and charge rates.
Just because a battery pack is rated at say 2000 amp hours doesn't mean it should be discharged by 2000amp hours of load. A couple of deep cycles and capacity will be permanently reduced.
The battery side should be fused. A fault will draw enough current to either melt equipment and start a fire. Or blow a battery and spray acid over the area.