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Old 01-06-2010, 07:06   #16
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Originally Posted by davevancat View Post
my catalina 30 has a xantrek 1000watt invertor onbaord which works for most things but am curious if i could stack another 1000 somehow and get closer to 2000 watts as the 1000 just isnt quite big enough for my microwave. is this easily done is it as simple as hooking up another 1000? thanks
Short answer: you need to contact Xantrek with your model number and chat them up.

There are inverters that you can stack, but they're designed for stacking. There are others that are stand-alone. Xantrek can explain that to you.

The other problem of not enough oomph for your microwave is either your microwave draws more than 1000w, your batteries don't have enough capacity, or your batteries are not strong enough for the load. Or the output of the inverter doesn't work well with the power supply requirements of the microwave.

So, if the microwave actually draws 1200W (you can find out by looking on the back) then you've exceeded the capacity of the inverter. Some inverters can provide a peak load for a short period of time, others can't.

1200W is 10A @ 120V and 100A @ 12VDC. If your battery capacity can't provide that (or better, several times that) then the voltage to the inverter will decrease and the current increase, straining the inverter. If the wires from the battery bank to the inverter are undersized then the voltage drop can be considerable.

You might find that the cost of stacking a couple of KW inverters or buying a 2-3KW inverter and associated batteries, chargers, etc. will buy a _lot_ of propane. While small microwaves are nice for heating that cuppa or doing that bag of popcorn, unless you've got a large capacity battery bank and charger system, imo, they're better used on powerboats than sailboats.

Capt. Douglas Abbott
USCG/MCA IV/M.I./C.I. 500-ton Oceans
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Old 02-06-2010, 10:54   #17
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Microwaves are great on sailboats, efficient, quiet and not deadly

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