OK, The AIMS PWRIC1500W inverter with 1200 watts continuous and 2,500 watts peak is suitable for a normal 1/3 HP sump pump.
A normal 1/3 HP pump will draw approximately 5 amps at 120 volts or 600 watts. and a start up load of about 300% should be allowed for to enable starting. This amounts to 1,800 watts and this inverter will deliver 2,500 watts Peak.
Now we hit a problem; Aims is stating that it's pump is 9.7 amps or double what is normal. I am quite sure that this is Advertising BS as they think (Just like vacuum cleaners) Higher amp motors sound more powerful to Joe Public so they use short term Max Amps and not the true sustained amps. The real fact of the matter is that an expensive and therefore efficient motor will follow certain inescapable laws.
1 HP is 746 watts, 1/3 HP is 249 watts or 2 amps. once ineffiences have been alowed for then 4 to 5 amps is reasonable but NOT 9.7 amps.
I searched their website and nowhere does it state TRUE amps. I strongly suspect this inverter will be fine to operate this Zoeller pump, but with the info they supply I cannot guarantee it. Yet purchasing a larger inverter would be very expensive.
I suggest you contact Zoeller Tech Support and ask for the REAL running amps (Anything up to 7 amps will be fine) or invest about $100 on a clamp on ammeter to test what your pump really draws.
Edited by Sir Sparks on 4/2/2010 at 1:08 PM EST