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  Topic Review (Newest First)
10-23-2012 01:13 PM
Re: Microwave and gen.

The 700W microwave probably uses at least 1150W and maybe 1400VA (11.7 amps). The generator is probably as small as they could make it with a rating of 1000VA (8.3 amps). If the 1000W generator breaker is 10 amps then you have 1200VA available but that's still not quite enough.

If the nameplate rating is in amps then you can multiply by 120 to get VA. If it says Watts then it is probably VA but you can't be sure. You might be able to use a 600W microwave if it is a high efficiency one that has less current draw than your alternator breaker. More likely the 600W one uses like 1100W and 1400VA.

Just get a 1200W or 1500W generator and make sure the alternator VA rating is somewhat higher. As long as you don't exceed the VA rating you won't trip the breaker or overload the alternator and the worst you could do is drag the engine down below 3600 RPM. Actually that might be bad since the lower frequency would cause your inductive loads to draw more amps because the alternator may still be trying to regulate the output at 120v and not lowering the voltage proportionately.
10-23-2012 01:18 AM
Re: Microwave and gen.

When circuiting a home we use a rule of thumb: the full load on that circuit should not exceed 80% of the breaker rating. A 15 amp breaker should have no more than 12 amps of load. A load is anything that draws (consumes) electrical power. Volts x Amps = Watts

Your generator is rated at 1000 watts. Your microwave is rated at 700 watts (if you got that figure off the stamped plate or load label on the unit). Therefore your load is 70% of the rated load of the generator. You should be just fine.

If your generator has a breaker on it, check to see if it's rated at 7.5 amps or more. Your 700 watt micro should draw a little less than 6 amps at full power. If so, you are okay to zap away.
10-23-2012 12:14 AM
Re: Microwave and gen.

We find our microwave to be one of the most useful things on our boat, especially when sailing. With MW special items like the pressure cooker we can cook rice in a heavy sea w/o spilling any water or monitoring. Reheating is fast & simple and heating water for my honey's cocoa is so swift I don't mind "cooking" for her!
2 hot dogs in 1 minute, fresh ears of corn are better than any other cooking method in about 5 minutes! Even fantastic fresh fish can be done in a MW, but it takes a while to learn how to use one successfully.
We use an inverter when we don't run the generator, but considering how short cooking in a MW is, there's not too much drain on the batteries. I would suggest a MW/convection combo, if you can afford the power; another super time saver for only a few bucks more.
10-22-2012 06:09 PM
Re: Microwave and gen.

I am forgetting the idea of a microwave. Thanks for all the ifno.
10-22-2012 11:33 AM
Re: Microwave and gen.

If you are going to run a microwave without shore power, I strongly suggest that you run your engine at about 1000 rpm while doing so. Otherwise you will be putting a big load on your batteries.
10-22-2012 11:29 AM
Tim R.
Re: Microwave and gen.

We have a microwave on our boat that we can run any time we want. We don't use it. When we go full time cruising, the MW will come out and we will gain a shelf.
10-22-2012 11:01 AM
Jak Just remember, is you go with the batteries/inverter solution, make sure the inverter will handle the watts, or you will be in the exact same spot. Look on your genny, most have 2 numbers, the 1000w is peak and not generally what it will put out (espcially if it is a Harbor Freight or made in China model, which also tend to burn out under hard use just when you need them most... )
10-21-2012 11:43 PM
Re: Microwave and gen.

Well if the rated power (W or VA) is less than the W or VA rating of the generator it should work. It's not the watt rating on the microwave that matters it's the input rating that should be written on some label. If it lists amps then multiply 120 by the amps and you have VA.
10-21-2012 11:21 PM
Re: Microwave and gen.

I had a friend who installed a microwave on his boat. I asked him why. He told me that it was to defrost frozen food. I responded that I did that at home; I put my frozen meat in the microwave before I went to work and it was defrosted when I got home, and the cat had not eaten it.
10-21-2012 11:19 PM
Re: Microwave and gen.

Or sell that gen and get the 2kw one for $150 more.
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