You should have the Magnum Inverter, This is from the owners manual. Doug
Motor loads not starting – Some appliances, particularly those with
induction motors, require a much higher start-up surge than they do when
running. Pumps, freezers and refrigerators (compressors) are the most
common. The inverter may not be able to start some of these appliances
even though their rated current draw is within the inverter’s limits. If you
have the CMW1012 or CMW1512, and a motor-operated appliance refuses
to start, observe the VOLTS indicator on the digital display while you are
trying to start the appliance. If the display shows a battery drop below 11
volts while the inverter is trying to start the motor, this may explain why the
appliance won’t run. Make sure the length/diameter of the battery cables are
appropriate, battery connections are good, and the battery is fully charged.
If the cables are sized correctly, the connections are good, and the battery is
charged, you may need a larger battery bank (see Loads turning on and off).
Loads turning on and off – If a load starts but quickly turns off, then the
battery may not be able to deliver the necessary amperage to drive the load.
If the battery bank cannot deliver the necessary amperage to drive a heavy
load, the inverter will shut off due to low voltage (<10.5 VDC). The battery
voltage can then slowly rise back above the low voltage reconnect voltage
(11.8 VDC) causing the inverter to resume operation. As soon as the heavy
load draws the batteries down, this cycle will continue unless the load is
reduced or more batteries are added.
Loads too large – Although the CMW Series inverter can provide high
surge power up to two times the rated output power, some appliances may
still trigger the inverter shutdown/protection system. In these instances, a
higher power inverter may be required.
