MPPT solar charger positioning?
Submitted: Tuesday, Apr 22, 2014 at 10:56
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neimad19
Hi all
Recently I purchased a 220w solar kit from Bit_deals on Ebay. He(?) was recommended to me by various other
forum members and I have to say, I'm really happy with the shipping time, price and product. Would recommend to others.
Here is my question. The solar panel comes with a MPPT charger siliconed to the panels and then a 8m lead with alligator clips that are meant to be run to the battery.
Is it worth peeling off the MPPT from the solar panel, extending the cables and remounting it right near the battery to reduce the 8m of voltage drop?
Regards,
Damien
Reply By: Member - Bruce C (NSW) - Wednesday, Apr 23, 2014 at 09:03
Wednesday, Apr 23, 2014 at 09:03
Hi Damien,
Locating the regulator closer to the battery is a good idea, however,........
While I have never removed a fixed regulator from one of Bit Deals solar panels to have any firm knowledge of the procedure, I would advise against trying to remove the fixed reg unless you have had a lot of experience doing so.
I think you might/could end up damaging the panel.
I would leave the existing reg in place and get another one and locate it where you want, then bypass the existing reg with the utmost care.
It may be a lot cheaper in the long run.
Use anderson plugs for main connections everywhere and in this way your options open up.
Cheers, Bruce.
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Follow Up By: Member - John and Val - Wednesday, Apr 23, 2014 at 11:56
Wednesday, Apr 23, 2014 at 11:56
Hi Damien,
I agree with Bruce. There is quite some risk of doing permanent damage if you try to remove the existing regulator from the panel. If practicable, I'd aim to get to the input side of that regulator, disconnect it and attach your cable at those points. MPPT controllers are now affordable and work much better close to the battery. (Controllers monitor battery voltage and aim to maintain the correct charging voltage. If there is a significant voltage drop between controller and battery, as there is when they are separated by a long cable, the controller is unlikely to fully charge the battery.)
A bit of an aside - flexible panels are light and thin so good to carry, but can't be free standing like solid panels. Solid panels are big and heavy. Has anyone had a go at mounting flexible panels on a light, thin backing such as say 3mm sheet plastic/perspex or similar? This would be light and easy to handle, yet can be easily deployed for maximum sun capture.
Cheers
John | J and V
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Follow Up By: Member - Rowdy6032 (WA) - Wednesday, Apr 23, 2014 at 18:59
Wednesday, Apr 23, 2014 at 18:59
Hi
I have removed the regulator from the Bit Deals 140 panel. It wasn't really a problem. I just used an old fishing knife with a very flexible blade. Most of the sealant is around the edges with a blob or two under the regulator. Just slid the blade around the edges and under the unit to remove it.
The regulator and panel was fine.
I then used the regulator near the battery and it worked fine, couldn't really tell if it made any difference.
As the regulator was only a cheapie I have recently replaced it with a Victron MPPT 70/15. Don't know how much difference it will make but in theory all should be good.
Regards
Rowdy
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