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post #1 of 7 (permalink) Old 18-10-2016, 00:02 Thread Starter
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Question One question in 3 parts !

A question, no - make that a three part question . . .

(a) I have three 4.3w solar panels (the ones shown here )
http://www.maplin.co.uk/p/solar-powe...-charger-n30cx
can I 'join' them together to give a bit more 'oomph' whilst still 12v ?

(b) I have two vehicle batteries, 1 is a 130Ah sealed battery (leisure battery) (don't know if it's lead acid or gel), the other is a 95Ah lead acid vehicle starting battery . . . Can I 'join' them together to give me a larger reserve of Amps (whilst still at 12v) and then use the three solar panels to trickle charge these two batteries ?
I realize that one being bigger than the other would result in pulling the bigger down to the same as the other but effectively would I lose much in Amps ?
And would I need a charging regulator ? 😵

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post #2 of 7 (permalink) Old 18-10-2016, 10:25
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The solar panels are not good for anything other than perhaps a phone or a small torch. 20W panels can be used to trickle a vehicle battery without a regulator/controller, higher output panels will require a controller.

You can parallel batteries of the same type but different capacities, as long as they are of a similar age and condition, you should not mix different technologies like wet lead-acid and AGM lead-acid.

Peter
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post #3 of 7 (permalink) Old 18-10-2016, 23:55 Thread Starter
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Thanks Peter,
(theoretically) what would happen if the two batteries WERE connected in parallel ?
(I use the batter(ies) to run a 0.13a computer fan along with a small LED bulb.

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post #4 of 7 (permalink) Old 19-10-2016, 00:08
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AFAIK if you connect two dissimilar batteries together they both work at the same level as the poorest i.e. an older one will drag a newer one down....

as Peter said, not a good idea similarly connecting solar panels like that will not improve their functioning as each depends on the voltage it is reading at the battery and of one is already supplying 13.4v the other would assume no charge is needed...

Hope that makes sense,

Dave

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post #5 of 7 (permalink) Old 19-10-2016, 01:23
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Don't join engine battery to leisure battery if you run both down you can't start the engine to charge them up which is why the are both separate.
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post #6 of 7 (permalink) Old 19-10-2016, 23:59 Thread Starter
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Don't join engine battery to leisure battery if you run both down you can't start the engine to charge them up which is why the are both separate.
No, These batteries are for a small back up LED lighting system in my shed at home.

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post #7 of 7 (permalink) Old 20-10-2016, 00:04
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Quote:
Originally Posted by Penquin View Post
AFAIK if you connect two dissimilar batteries together they both work at the same level as the poorest i.e. an older one will drag a newer one down....

as Peter said, not a good idea similarly connecting solar panels like that will not improve their functioning as each depends on the voltage it is reading at the battery and of one is already supplying 13.4v the other would assume no charge is needed...

Hope that makes sense,

Dave
Will those Maplin chargers have any controlling logic Dave? I don't think so. Connecting three together, in parallel, will make them 3 x more effective when charging a battery. They are not going to charge the battery at a great rate however as they will still only be supplying less than 15 watts. A good battery charger is blasting out 10 to 20 Amps so even three of these devices is a drop in the ocean but, in some circumstances, might be better than nothing.

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