Inverter battery drain

Vanterrier

Vanterrier

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I have two 110ah leisure batteries and am thinking of installing an inverter - pure sign wave 1000w continuous, from Maplins. The plan is to run a small microwave oven 750w max so a couple of three to four minute bursts to heat some food then put away again...

So say 8 minutes continuous use at 750 W, how much of a drain will this be on my batteries? I have no idea how to work that out ???

K ;)
 
My 700W microwave draws approx 1260W (about 105A at 12v) - remember, the 700W rating is the ouput/cooking power and not the input power.
 
here's a stab at it ! 750w @12v means 63 amps add 10% for inverter efficiency. so say 70 amps. 70 amps for 8/60hr is about 9 ampere/hours. hope my maths is ok !

I think the last appeared while I calculated..so...If similar to sparrks's oven then 105 amps for 8/60th hour is about 14 amp/hours...but maybe a 1000 watt inverter will be overloaded ?
 
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The 750W is output power so input power is going to be somewhere between 1200W and 1500W of mains power to make it work properly ideally want an inverter of at least 2000W continuous rating or its not going to last long. You will also need some serious wiring straight to the battery as the current is going to be very high. Always use good quality cable and don't forget you get a voltage drop over distance so you really need to keep the cables as short as possible. Ps DON'T buy a cheap one off ebay ..
 
cornishlad said:
here's a stab at it ! 750w @12v means 63 amps add 10% for inverter efficiency. so say 70 amps. 70 amps for 8/60hr is about 9 ampere/hours. hope my maths is ok !

I think the last appeared while I calculated..so...If similar to sparrks's oven then 105 amps for 8/60th hour is about 14 amp/hours
Click to expand...

Mathmatically that is correct, however, as the discharge load increases then you start to run into Peukert's law and things get rather complicated. :)
 
sounds like it may be best to but the pasties hot :tongue:
 
Hmm... I thought it would not be simple so thanks for the tips...

So, I should buy warm pasties, stick them on the engine until I get to my destination then go to a site with EHU and plug the microwave into the mains...

Seems like a lot of hassle and risk to avoid turning the gas oven on so I think I will hold off on this particular development for the minute.

Thanks all

K ;)
 
I got a 12v "oven" great for pasties etc. I place said snack into oven approx 15mins prior to consumption whilst travelling to destination.
 
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