VEVOR 3000W Sump Pump Battery Backup System, LCD Display, Auto Switches to Battery Inverter Power for Sump Pump, Pure Sine Wave, for Basement Protection Emergency Power Outage, Batteries Not Included
1. This depends on the battery capacity. Two 100Ah batteries connected in parallel would provide 200 × 12 × 0.9 / 375W = 5.76 hours of continuous runtime. However, a water pump cannot run continuously for that long; it would essentially drain the tank in about an hour.
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Will this work for this buffering scenario? The UPS is plugged into 20A outlet that is also using 1500W for a heater while charging the UPS. While the power from the 20V outlet is still on the UPS's battery outlet powers a 1500W microwave, temporarily. The 20A outlet draws 1500W for the heater & the small amount to charge the UPS battery. The UPS battery provides the on demand 1500W for the microware while the 20A outlet power remains on. This way the total power isn't limited to the UPS output
A 20A socket can only supply power to devices with a power of 2400W, regardless of the location. It was sufficient for charging the battery with a 1500W UPS, but it might not have been enough to power the water pump at the time.
This depends on the battery size. For example, a 100AH battery * 12V = 1200W. If your water pump is 350W, then it would be 1200W / 350 * 0.9 = 3.08 hours/hour.
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