One 12v microwave oven I looked at online still had a large current draw. 55 Ah.
http://www.power-hunt.com/12-volt-microwave.php
That is less much than the 90+ Ah draw a 700 watt microwave would have through an inverter though.
Re: Isolators
Great info here:
http://www.donrowe.com/battery_isolator/isolator.html
It doesn't look like it would cost too much to replace your isolator and keep it as a spare.
I think you still need and inverter for charging your laptop and phone etc. I think you mentioned a printer also.
Quote:
Originally Posted by MegA
.......What if I just try to use the laptop for a little while and the isolator doesn't work and I can't start the van after that, or something gets fried?
What if the laptop gets fried? It's the only computer I have.
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If you are just using your laptop then you would only use the inverter connected to the battery in the back of the van and the van motor
would not need to be running. You'd recharge the house battery when you started the motor later.
My understanding is that when isolators completely fail the batteries are not connected. However, that said, Mike had problems with the isolator in his van allowing the chassis battery to discharge. He ended up replacing it.