Purchased product a few days ago. I have it hooked up directly to a a new 12V Marine (Duralast) deep-cell battery. Input volt reading on inverter hovers around 12.1 - works well with cell phones & laptop. However, the 900w microwave triggers the alarm and LUP code (manual states: Cause - The voltage input is too low. Solution - charge battery.
You need at least a 1900 watt inverter with a fully charged battery to run a 900 watt microwave,it uses 900 watts to make microwaves and it uses 700 or so to run everything else.
SOURCE: cyberpower 1000 watt 12 volt
When the wattage of an invertor is specified it is meant for the power load but with a gradual CURRENT drain. If you load with modest loads of lighting , fan or other low wattage device it will work without tripping off. In this case your microwave when loaded will initially start up with a large surge current requirement thereby shutting off the invertor as it detects overload. So the safe limit to operate a microwave is to have an invertor above 2000 watts . If the input supply is 24 volts , then it will be more powerful.
Also try with a low wattage/heating setting on the microwave, tighten the battery terminals of the battery . Sometimes it might start but can also damage the invertor. failure of the driver MOSFETS.
SOURCE: The Marine deep cycle Battery
If you value your other componets in you setup throw away that unit ASAP. They are nothing but problems and I'm sure that's where your issue lies. Even if you replace the blown fuse (known issue with this unit) your gonna have other problems down the line. Also stay away from the Sunforce 11260. I like Sunforce products but for some reason these two particular models are just complete junk,
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