But if you are overloading frequently then you system is a bit undersized.įor motors like pumps there are easy start controls you can use to prevent the heavy amp draw and bad power factor.

Short bursts should be ok if you know what is causing it. Sustained overload causes overheating and system shutdown. Of course this is very simplistic working as it does not account for temperature derating and cable or other resistance and heat losses. I have seen a 1500W lawnmower overload a 10kVa inverter.ĥ000va / 48v = 104A some batteries cannot handle the Amp draw so siszing so there is no voltage collapse is important. So a 500w motor can draw anything up to and over 3000VA. Motors usually have poor power factor unless there is a system put in place to correct it. We usually work with an 80% average power factor so a 5kva will be rated for about 4000w depending on the components of your system. As watts are what the system sees as being used but VA is the actual power used and the difference is caused by power factor. Watts and VA are two different measurements.

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