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Subject Topic: Usb ports to a 12v socket possible?? Help Post Reply Post New Topic
PersonJongibsta
19/5/2016 at 11:53am
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http://www.lidl.co.uk/en/our-offers-2491.htm?action=showDetail&id=33695

I want to use this solar panel that has two useful USB ports coming off it, for use with my 12v cool box.

Issue is it runs of a 12v adapter.

Is there such a thing as a USB to 12v socket??

Thanks


Personseanfdh
19/5/2016 at 1:39pm
 Location: North Devon
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Most powered cool boxes draw about 5 amps at 12v so you'll need a bigger panel than that for it to work.


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PersonColin21
19/5/2016 at 2:55pm
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To put some figures on it, that solar panel generates 13.2 watts. Probably in ideal conditions, i.e. direct, strong sunlight. To run a coolbox drawing 5 amps you would need 60 watts, but even then that would be in ideal conditions. If I wanted to run a coolbox just from a solar panel, I would be looking for one that could give out at least 100 watts.

As they say in the advert, that solar panel is ideal for charging phones, and that's about all I would imagine.

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PersonTroon
19/5/2016 at 2:58pm
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Wot seanfdh said.

USB is 5V, with 500mA maximum current output as the standard. There are charging "addenda" that allow up to 2A if the socket and device are capable. 5V at 2A is 10W.

It is possible to convert 5V up to 12V, but you're still limited by that power output. The conversion will only be about 80% efficient, so even if you could get a full 2A output from the USB (unlikely), you're looking at about 8W, or less than 0.7A at 12V.

That won't cool much.


PersonJongibsta
20/5/2016 at 12:10am
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Thanks for that.

So looking at it another way. Could the cigarette socket power leads to charge up a spare leisure battery as we drive? This way I would have a spare battery to power the fridge when stationery


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PersonColin21
20/5/2016 at 7:48am
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Not an ideal way to do it, but I'm sure it would work. However, bear in mind that the continuous drain of a coolbox will flatten quite a large battery in a matter of hours, which is why most caravan fridges run on gas or mains EHU when on site.

Another thing to bear in mind is that the wiring to a cigarette lighter socket in a car is probably not capable of handling the large current required to charge a large, flat battery. If you want to go down that route it would be a better idea to have a proper split-charging system wired in to your vehicle. Its quite easy to do.

-------------
Best Regards,
Colin


Personfleck2
20/5/2016 at 10:22am
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And use a compressor fridge, they are more efficient.


PersonColin21
20/5/2016 at 7:35pm
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Yes, Fleck2, I quite agree. I once had a coolbox on my boat, and it completely flattened my leisure battery in less than a day, whereas on the next boat I bought I fitted a compressor fridge. On one occasion I forgot to turn it off when I went home and the following weekend it was still running.

-------------
Best Regards,
Colin



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