Powering our Microwave

Jun 18, 2008
1,533
1,884
Lancaster
Funster No
2,925
MH
Elddis Majestic 285
Exp
11
We have a built-in combination Microwave / Oven in our van which is plugged into a standard 13amp socket.

Up to now we haven't had any problems because we've only been to sites with hook-ups but what should we do when we start going 'wild'?
 

Terry

LIFE MEMBER
Dec 27, 2007
11,341
6,812
South yorks
Funster No
1,075
MH
A class
Exp
Can't remember ;)
:ROFLMAO: buy an inverter or don't use it :thumb:
You will need at least 1,000 watt inverter if you have a 700w micro because it surges to start,better not to use it wild :ROFLMAO:
terry
 

Pikey Pete

Free Member
May 25, 2008
1,532
1,142
o
Funster No
2,818
MH
o
Exp
0
As said previously, learn to live without it. Using an inverter is a huge drain on the batteries.:Sad:
 

TweetiePie

Free Member
Sep 27, 2007
117
64
Mid Wales
Funster No
449
MH
Movano self build
Exp
on and off since 1968
I used an inverter for an 800 watt microwave, it was a 1000 w and work OK with two 110amp batteries and a solar panel to top up the batteries. We used it while using french aires for 8 weeks but only for about 20 to 30 mins a day
 

oldun

Free Member
Mar 23, 2008
748
162
St Neots
Funster No
1,917
MH
VW Campervan
Exp
Since 2001
A 110Ahr battery would at the very best supply 100A for 1 hr at 12V = 1.2kw for one hour.

In practice it would provide only about 60% of this, i.e. 720W for one hour.

To look at it another way a 1000W converter would (again in theory) take 1000/12 = 84A. In practice it would be nearer 90A.

This type of current means that the inverter must be wired directly into the battery using very stout cables.

In general large inverters are only feasible with large banks of batteries or are just for emergency use.
 

American Dream

Free Member
Aug 20, 2007
6,371
154
Lincoln
Funster No
125
MH
?
Exp
?
I would use a generator!
Much less bother!
Genny for me too.:thumb:

An inverter with that sort of power output and proposed run time would flatten the Leisure batteries in no time as has been mentioned previously.

I guess if you're going "wild" then perhaps it IS best not to use it.
 

oldun

Free Member
Mar 23, 2008
748
162
St Neots
Funster No
1,917
MH
VW Campervan
Exp
Since 2001
you could always spend a small fortune on a 12v microwave.:thumb:
This would also impose a huge drain on the batteries and the motorhome wiring loom.

For example 720 Watt is 60 amps - no standard motorhome wiring can get anywhere near 60 amps. Most circuits have a maximum of 25 amps or much less.

You need a very serious 12V power supply and non-240V charging system to provide such power.

For standard MHs microwaves are a no-no without 240V ehu.
 

Thepips

Trade Member
Sep 26, 2007
493
1
Basingstoke
Funster No
441
MH
RV
Exp
6
Our RV does have a 3kw inverter and 4 6v 125 amp hour batteries. The inverter/charger is mounted right next to the batteries with cables the size of starter cables. I have used the microwave off it, 5 minutes of microwave power doesn't hurt the batteries but I wouldn't want to cook a meal:ROFLMAO:

Regards
Doug
 

pappajohn

LIFE MEMBER
Aug 26, 2007
36,345
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Exp
Since 2005
This would also impose a huge drain on the batteries and the motorhome wiring loom.

For example 720 Watt is 60 amps - no standard motorhome wiring can get anywhere near 60 amps. Most circuits have a maximum of 25 amps or much less.

You need a very serious 12V power supply and non-240V charging system to provide such power.

For standard MHs microwaves are a no-no without 240V ehu.
the one i was looking at was only 124w...:Eeek:
you'de forget what you were cooking before it was cooked..:ROFLMAO::ROFLMAO::ROFLMAO:
 

pappajohn

LIFE MEMBER
Aug 26, 2007
36,345
24,719
Dark side of the moon
Funster No
172
Exp
Since 2005
We have a built-in combination Microwave / Oven in our van which is plugged into a standard 13amp socket.

Up to now we haven't had any problems because we've only been to sites with hook-ups but what should we do when we start going 'wild'?
buy a generator.....no more worries :thumb::thumb:
 
Apr 27, 2008
7,997
5,337
Eastbourne East Sussex
Funster No
2,327
MH
A Class
Exp
Since 1972
I'd go with Pappajohn on this. A generator of a suitable output will probably cost you half as much as an inverter and some are quiet and resonably light. If you're not bothered about the noise you can get a cheap generator for £90 whereas a 1300w inverter will set you back £400-£500. The inverter isn't weightless either and if you need an extra battery or two will outweigh the generator.:RollEyes:
 

oldun

Free Member
Mar 23, 2008
748
162
St Neots
Funster No
1,917
MH
VW Campervan
Exp
Since 2001
I'd go with Pappajohn on this. A generator of a suitable output will probably cost you half as much as an inverter and some are quiet and resonably light. If you're not bothered about the noise you can get a cheap generator for £90 whereas a 1300w inverter will set you back £400-£500. The inverter isn't weightless either and if you need an extra battery or two will outweigh the generator.:RollEyes:
Good grief!

A genny or inverter plus 12V microwave - what a cost.

it's much cheaper to eat out at the Ritz.

Or failing that its even cheaper to stay on a site with an ehu.
 
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