Mobile air-con from batteries ????? - Motorhome Forums, Motorhome Discussion, Motorhome Chat

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post #1 of 20 (permalink) Old 15-09-2008, 12:46 Thread Starter
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Mobile air-con from batteries ?????

Hi all,
I was down Spain in July this year and the heat build-up in the van got very uncomfortable, as I have fitted 2x130 watt solar panels which give off about 14amps in this sort of weather and 4x100ah batteries, would this run a 925watt 240 volt mobile aircon unit through the inverter?
Would the inverter need to be pure sine wave?
Does anyone use mobile A/C and how good are they?

many thanks in advance
Ken
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post #2 of 20 (permalink) Old 15-09-2008, 16:30 Thread Starter
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where are all the lecky experts, surely somebody has the answer.
Ken
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post #3 of 20 (permalink) Old 15-09-2008, 16:56
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"would this run a 925watt "

No.

Yes I run mobile dash aircon (engine compressor) and mobile roof aircon (from the alternator when really needed). Mains on site when the noise is acceptable (rarely).

Dave
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post #4 of 20 (permalink) Old 15-09-2008, 17:28
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You would get a couple of hours running (max) from the aircon before your batteries were flat.
Not really practical. Better to try and keep the heat down using none powered methods like nakedness
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post #5 of 20 (permalink) Old 15-09-2008, 17:31
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Cheaper to pay for hook up or buy a suitcase genny

your solar panels would take days to recharge batteries

Inverter would cost a bomb to install and if you where lucky would give around 3 to 4 hours use

Alan H
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post #6 of 20 (permalink) Old 15-09-2008, 17:31 Thread Starter
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Hi Dave,
thanks for that, when I said mobile A/C what I probably should have said was free standing A/C unit.
What voltage is your roof A/C and how many watts is it and how many amps would that take
Ken
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post #7 of 20 (permalink) Old 15-09-2008, 17:32
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If you are somewhere that is dry and hot then you will get some benefit from an evaporative air con unit. They don't belt out the cold like compressor units but then, they do only pull about 65watts which is 5 and a bit Amps so your solar panels could power it without it draining the batteries.

link here

http://www.coolandwarm.co.uk/product...onditioner.htm
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post #8 of 20 (permalink) Old 15-09-2008, 17:43
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925W would pull over 70 amps running at 12V. Heck of a strain on your bateries even if you have 4 of them. You would need some seriously thick cables from batteries to invertor too

Much better off, and safer, using a mains powered one on hook up.

Trevor

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post #9 of 20 (permalink) Old 15-09-2008, 17:53 Thread Starter
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Hi,
thanks everyone for that, it sounds like the evaporative A/C unit as suggested by AberdeenAngus could be the answer. (including the nakedness).
Does anyone use one of these and how good do they find it please.
Ken
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post #10 of 20 (permalink) Old 15-09-2008, 18:03
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Hi

I think you have your answer now so I can ask: and I am not trying to be clever, honest but why go somewhere so hot that you cannot stand the heat and have to consider running air conditioning? Motorhomes allow you to follow the sun but you don't have to get that far south in July Or am I missing something... I too hate it when the ambient temperature is very high ( unless it is dry heat) so tend to avoid the places where that happens or at least keep away from them in mid summer.

Although having said that ...it would have been nice to have got too hot in the UK this Summer

Mike

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