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Thread: Mobile air-con from batteries ????? Reply to Thread
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  Topic Review (Newest First)
19-09-2008 13:33
olley Hi ken on a 16amp supply I can run both aircons, The 110volt genny runs everything as its roughly equal to 25amps at 230volts.

My 1800watt inverter won't run either aircons or the M/Wave, the start up current is to high, it immediately trips out. I need a bigger inverter, maybe a yank 110volt one.

18-09-2008 14:20

Hi Olly thanks for that, I presume when you use the A/C you are on EHU, so does the EHU on sites give you enough amps to run the A/C or do you use a genny
17-09-2008 14:23
olley Hi Ken divide the wattage by the voltage, add about 10% to that figure for inverter losses. ie. 1000watts at 12v= 83.33 amps plus 10%=91.66 amps.

To save calculating I alway assume 10amps at 12v per 100watts as a rule of thumb.

The winnies got two AC units and we find that if we leave the front one on with the doors closed to the bedroom, you can hardly hear it and it cools the bedroom nicely.

17-09-2008 13:15

Hi C,
thanks for that, we do use the water spray and it does help a little.
My van is a hymer and well insulated, if I keep the sun out it takes a long while for the van to get hot inside but once it gets hot its difficult to cool it down again, I just thought if I could run an A/C for say 1 hour it might just lower the temp a bit.
I would be interested to know what the formular is for converting the 240 volt figures, amps/watts etc to 12 volt figures when run through an inverter.
Probably the visit to the pool is the best answer.
many thanks
16-09-2008 23:06
CliveMott My mental arithmatic would suggest that the amps draw allowing for ineficiencies and a depleted battery voltage because of the high amp draw would be closer to 100 amps, so as had been said the answer is NO.
I haven,t yet found any living area air con that is quiet enough to be acceptable. BIG roof vents and shade are probably the best unless you are deaf. One of those insectiside sprays that produce a fine mist filled with water can refresh one,s being.
We had aircon in a Winebago we hired in Oz. We only ever used it to pre-cool the van when we were elsewhere (in the pool). When we returned it was turned OFF. We have not specified living area air-con for our new van but have specified it for the cab, usefull while travelling on the odd occasion.

15-09-2008 21:38
kencocamper Hi Silvasurfer,
we love Portugal, spent 4 months touring the coast of Portugal and southern coast of Spain, all wildcamping apart from one week on Faro island which cost about 10 euro, SUPERB.
15-09-2008 21:23
Does anyone use one of these and how good do they find it please
The evaporative coolers ONLY work well if the air is dry.
We tried one in France last year and all it did was make a sticky situation stickier.
15-09-2008 20:17
heat in spain air -con

The secret to your problem in Spain in julio? this year has been a hot one and its still hot ,and getting hotter the secret! dont come , we leave about may/june because its too hot where we live and come back sept/oct, but july/agosto are the worst months. try Portugal its cooler and and safer. just had 3 months there and its great, a country of castle's lakes and lots of culture. lots speak french and of course english and they understood our spanish.
15-09-2008 19:44
kencocamper Hi Mike,
yes you are right, we went down in April and started to make our way back beginning of July, which we usually do as the weather starts to get really hot and the tourists arrive, but I just thought with all that unused power, could it be used to make the van more comfortable, especially for Jasmine, even though she was naked she was still panting and I had to spray her with water.
(The things we do for our dogs.)
15-09-2008 19:40


Depending on the wattage of your portable A/C and the power of your alternator, you could use it on the move. However, as already pointed out would only run for around 3-4 hours and would take a long time for your solar panels to re-charge the batteries.

Mobile A/C units are not as powerful or effecint as split or roof units. Indeed if used in too small a space/room can be even less effecient. More use for spot cooling.

See my other posts regarding portables.

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