SOURCE: Grundfos Pump On Xantrex Modified Sine Inverter?
if the power of you pump is above that of the inverter you intend to buy it will not work, buy one with at least 200watt difference.NB these pumps might take lots of power so your batteries might run down quickly
SOURCE: Xantrex model rs2000. just purchased used. owner
If it shows NO external source, then this is most likely the best place to look to find out why not?
http://www.ehow.com/how_7519715_troubleshooting-ac-inverter.html
Now above is a link that show you how to troubleshoot an AC inverter. Now below, there is a service manual, here at the back, is a factory troubleshooting chart that will be beneficial to you.
www.xantrex.biz/...Inverters/.../XS400_Owner_Guide(975-0054-01-01_Rev- B).pdf
The Biggest problems with Inverters is Flat/Low/Bad batteries, Sometimes it pays to remove the batteries and charge then up remotely, and then replace them, fully charged, Now a fully charged 12 volt battery should have 13.8 V DC at the terminals with NO LOAD. If the battery only reads 12 V it is not properly charged.
SOURCE: Grundfos Pump On Xantrex Modified Sine Inverter?
SOME MOTORS HAVE TROUBLE, starting on Modified sine wave power. Grundfos is a high quality unit, you could try an other motor driven load to see how it is handled by your power supply.
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