12V/24V Microwave Ovens
I looked into installing a microwave oven in my campervan last year. Here is a summary of what I found.
The main problem is the power consumption. Most microwave ovens produce 500W to 800W of microwave power which, with a typical efficiency of 50% requires an input power of 1500W or 125A @ 12V or 63A @ 24V. While a leisure battery should have the capacity (Ah) to supply this current for short periods, one must check the maximum permitted rate of discharge. The cranking amperes (CA) is specified for starter batteries but the equivalent specification for a leisure can be harder to find.
24V Wavebox Microwave Oven, 7 litres, Input: 600W @ 24V. This is on the RoadKing website [3]. There may also be a 12V model because there are several YouTube reviews of a 12V version.
Whispaire Portable Microwave, 17 litre, 12V and 24V models, Input power: informative table on website [1].
Dometic Roadmate MWO 230 Microwave Oven, 20 litres, Input: 30A @ 24V (720W) & Inverter for mains operation
Expect to pay several hundred pounds. Mains powered ovens are much cheaper and have the advantage that the inverter could be placed next to the battery and only a mains wire would be needed run to the oven rather than a low voltage wire capable of 30+ amps. The other advantage would be that the oven could be powered direct when one has hook-up.
I was grateful to the Microwave Service Company website [2] for drawing my attention the fact that some microwave ovens draw a surge current each time they switch on. Apparently, these surge currents can be large enough to trip the supply on some campsites.
Richard.
[1] The specification for the Whispaire Portable Microwave, 17 litre model gives details of the power required for the various settings.
Whispaire 12/24 volt microwave
[2] The Microwave Expert’s site has a number of most informative articles.
Microwave Service Company Ltd
He states that he can supply a low surge oven.
Low Power Microwaves for Caravans
[3] RoadKing
24v Ovens | 24 Volt Portable Truck Ovens | ROADKING.co.uk
For more sites, search “12V 24V microwave oven”.