"Darren" wrote in message
...
Hi, I have sold a guy a 600w modified sine inverter, was tested before
it
was sent away, he received it but he couldnt get it to work (he wants it
for
his fridge), so he brought it back to me. I tested it and it didnt work
so
I
gave him a new one, I tested it infront of him with a 500w jigsaw,
worked
fine. I got a call from him two hours later, he said he tested it on his
drill it workd fine then he put it on his 300w fridge but it didnt work
so
he tried the drill again and that didnt work either. So now he has blown
up
two inverters.
The inverter has a overload cut off so I dont see how the fridge could
blow
up the inverters, anyone have any idea?

There is a company that sells inverters specificaly to run fridges in boats,
the model they sell has a 600 watt continuous output, and something like a
2.5 to 3 killowatt surge capacity, that's something that's not common on a
standard 600 watt inverter.

i fridge's compressor will pull a hell of a lot of current on start up,
easily more than a 'normal' inverter can supply, unless it's a 2000 watt
consinuouse unit with a surge that easily covers the surge at compressor
startup.

i'd tell him to stop blowing inverters, and get the details of what his
fridge really pulls (it's like people who buy a 700 watt inverter to run
their 700 watt microwave, that's just the cooking power, the actual power
drawn will be anything upto double the cooking power (i have a 550 watt
microwave in my motorhome, so you'd think a 600 watt inverter would cover it
with ease, but it's input power is 900 watts, with a larger surge on initial
start up on full power.. i can actually get this microwave to work on my 330
watt cheapo inverter, but only on the lowest setting and for a minute at the
most before the inverter trips out)