suggestions needed on spare 15W

Submitted: Monday, Feb 13, 2006 at 15:11
ThreadID: 30731 Views:1224 Replies:4 FollowUps:3
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I have a spare 15W BP Panel, that i originally bought as a trickle charger. Worked very well in maintaining the battery, as the car was only run once a fortnight.

I now have a 24V vehicle...with a 3rd 12v aux AGM in the back which is charged very effectively..and not requiring an extra piddly 15W.

The 15W panel is fixed to a tool box on the roof...going to waste.

My thoughts:

Mount a small 7.2 or 12A/h or small sealed Lead acid battery in the toolbox...charged off the panel (it has a 5A regulator).

Then it can be used to power camp lighting, leaving the aux to power only the fridge.

Just trying to find a use for my Panel...thats all...and if i can devise a reasonably self sustaining ability to run a versalight or such...then seems to be a winner.

Any thoughts on the matter?

Regards
Rev

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Reply By: signman - Monday, Feb 13, 2006 at 15:41

Monday, Feb 13, 2006 at 15:41
Don't shoot me if this sounds stupid.....
If the panel outputs 15W @ 12V...would it put out (about) 7.5W @ 24V??
AnswerID: 154714

Follow Up By: Mike DiD - Tuesday, Feb 14, 2006 at 10:18

Tuesday, Feb 14, 2006 at 10:18
Just some tips on Electrical quantities.

Power is conserved - not Voltage or Current.

If a Panel put out 12 volts at 1 Amp (12x1= 12 watts) and you converted it with 100% efficiency to 24 volts, you would be able to get 0.5Amp (still 12 watts).

Mike
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FollowupID: 408846

Reply By: revhead307 - Monday, Feb 13, 2006 at 16:15

Monday, Feb 13, 2006 at 16:15
It only puts out 16 or 17V open voltage...so cant be altered to run 24v.

The starter batteries dont need any trickle assistance, they cope very well...and the 24v import cranks over and starts faster than the 12v trol i had.

Cheers
Rev
AnswerID: 154717

Reply By: cruiser - Monday, Feb 13, 2006 at 16:51

Monday, Feb 13, 2006 at 16:51
Give it to me, give it to me

Seriously, I will take it, but dont know where you are so how do we do this. I am on Mid North Coast of NSW if that helps.
AnswerID: 154726

Follow Up By: cruiser - Monday, Feb 13, 2006 at 16:53

Monday, Feb 13, 2006 at 16:53
Oops, silly me, I thought you were giving it away, oh well, better go and have another drink and belt myself up.
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FollowupID: 408711

Follow Up By: revhead307 - Monday, Feb 13, 2006 at 16:55

Monday, Feb 13, 2006 at 16:55
lol

Hi Cruiser, giving/selling it wasnt really on my shortlist.

I tend to hoard things...as they may always be useful 'one day'.

I picked mine up off ebay for $145 12 months ago...

Regards
Rev
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FollowupID: 408712

Reply By: Mike DiD - Tuesday, Feb 14, 2006 at 10:23

Tuesday, Feb 14, 2006 at 10:23
A battery in a Toolbox on the Roof won't last long, the heat will kill it.

I would just connect the Panel to the existing 12volt Aux battery. It will keep it topped up and therefore lengthen its life by keeping it closer to 100% charged more of the time. This will reduce Sulphation.

Mike
AnswerID: 154862

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