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post #1 of 20 (permalink) Old 11-01-2019, 21:34 Thread Starter
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solar panel

Hello I got a 25w solar panel which I am going to connect up to leisure battery while in storage .I have got alarm on the van running while stored . My question is will the 25 w solar panel run the alarm ?
whats the thinking on this ?
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post #2 of 20 (permalink) Old 11-01-2019, 21:40
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Depends on the sun input but I would doubt that it would be enough....

I have 170w and that more than suffices BUT when I was living in Devon we only had 10w and it was nowhere near enough even though the panel was south facing and Devon overwinter gets a fair number of sunny days...

Others may have more views, but IMO the battery will decline over about 10 days becoming dangerously flat and risking permanent damage.

Thinking of; Mavis, Ray, Sandra and Albert at this time.

Any comments above are only MY OPINION and should be read as that.

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post #3 of 20 (permalink) Old 11-01-2019, 21:55
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hi

welcome i would have thought that a 30 w is a little small

you could allways try it for a week and see how it keeps the battery charged

aim it at where the sun is likely to be most of the day

let us know how you get on

barry
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post #4 of 20 (permalink) Old 11-01-2019, 22:34
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No.


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post #5 of 20 (permalink) Old 12-01-2019, 17:35
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If you have direct sun for a good few hours per day then a 10w panel MIGHT JUST be enough, but at this time of year a 100W panel would struggle.

As a way of explaining I have a 3.9KW Solar Array on my house roof. Today it generated 1.5Kw hours over the whole day. So 10w would have generated ??? Bugger all!!

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It's who you share the journey with (even if it’s in a caravan!) I am very fortunate to have Mrs Plodd to share mine with
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post #6 of 20 (permalink) Old 12-01-2019, 17:58
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hi andy

that was a good example and it does give us all an insight into the output on a dull day


barry
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post #7 of 20 (permalink) Old 12-01-2019, 19:05
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My van came fitted with a 30w solar panel, it struggled in mid winter and I had to supplement it with EHU.
Last year I fitted a 120w panel (the max recommended with my seargent controller) and it has been no problem, it is parked on a shared drive between me and my neighbors (more on his side than mine but he is OK with it) we both have a rendered white walls so I think that the reflected light helps in the winter.
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post #8 of 20 (permalink) Old 12-01-2019, 20:27
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I have an 80w Solar panel and it has kept my batteries (2 Leisure and starter) topped up throughout the year for the last five years without need for EHU.

It's parked on the drive, alarm fitted and working and I have a couple of LED meter indicators to monitor the batteries so I know how well, or bad, they are.

I wouldn't have thought a 25w panel would be big enough to help keep their charge unless you give the MH a decent run on a regular basis.

Moving the MH regularly will also help stop any 'flat' spots developing under the tyres and will help give any parts such as brakes the chance not to seize on.
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post #9 of 20 (permalink) Old 12-01-2019, 21:51
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They sell small dash solar battery maintainers for about £30 to £40 but only 25w.
These are usually pretty ineffective unless full sun all and every day. At best they might just keep a disconnected battery maintained.


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post #10 of 20 (permalink) Old 13-01-2019, 07:48
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The only solution for the OP is to get some proper solar up there with an MPPT controller (£200 ish DIY) plug it in, or go for a drive once or twice a month.
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