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Best Solar battery maintainer for non-daily driver #4636116
01/15/18 07:32 PM
01/15/18 07:32 PM
Joined: Oct 2011
Posts: 465
Union County, PA
2James1 Offline OP
2James1  Offline OP
Joined: Oct 2011
Posts: 465
Union County, PA
Recommendation for best solar powered battery maintainer for non-daily driver?(preferably one that doesn't break the bank)


2005 Chevrolet Malibu V6
Castrol Edge HM 10w-40/ Purolator Pureone

2015 Cruze LT 1.4T
Dealer Oil/Filter
Re: Best Solar battery maintainer for non-daily driver [Re: 2James1] #4636216
01/15/18 09:39 PM
01/15/18 09:39 PM
Joined: Jun 2003
Posts: 33,776
ME
eljefino Offline
eljefino  Offline
Joined: Jun 2003
Posts: 33,776
ME
Best or cheapest?

Does your cigarette lighter work with the key off?

Re: Best Solar battery maintainer for non-daily driver [Re: 2James1] #4636347
01/16/18 06:47 AM
01/16/18 06:47 AM
Joined: Dec 2016
Posts: 80
Greece
Panos Offline
Panos  Offline
Joined: Dec 2016
Posts: 80
Greece
Google "vw solar battery maintainer"
I have found the cigarette lighter version on ebay years ago. Works flawlessly.
There is also a can bus version for the vehicles that cut the connection to the cigarette lighter


Ford fiesta 1.6 mk6 Motul specific 913D/Motul Gear 300
Kawasaki ninja 250r Shell Advance Ultra 4T 10w40
Honda cbr600f Pc41 Motul 7100 10w30
Re: Best Solar battery maintainer for non-daily driver [Re: 2James1] #4636443
01/16/18 08:45 AM
01/16/18 08:45 AM
Joined: Oct 2004
Posts: 8,467
Cincinnati, OH, USA
bullwinkle Offline
bullwinkle  Offline
Joined: Oct 2004
Posts: 8,467
Cincinnati, OH, USA
I've been using the cheap HF and Northern Tool ones, they've been doing well, even on dual battery diesels, as long as the battery(s) are fully charged before parking them. Connected straight to battery with the little clips.


06 Ram 3500 CTD 4X4(FG Venturi), 93 GMC C3500 6.2, 89 F-450 7.3, 98 XJ 4.0(XG8A), 05 xB(XG3600), 18 Transit 3.7, 03 Merc Grand Marquis 4.6 2V(XG2)
Re: Best Solar battery maintainer for non-daily driver [Re: 2James1] #4636641
01/16/18 12:05 PM
01/16/18 12:05 PM
Joined: Nov 2013
Posts: 1,968
Chicago, IL
EdwardC Online content
EdwardC  Online Content
Joined: Nov 2013
Posts: 1,968
Chicago, IL
I've used a handful of different ones and I think in general, they're all about the same. I'd buy based on price, connectivity, mounting style and wattage.

Re: Best Solar battery maintainer for non-daily driver [Re: 2James1] #4638661
01/18/18 10:47 AM
01/18/18 10:47 AM
Joined: Oct 2011
Posts: 465
Union County, PA
2James1 Offline OP
2James1  Offline OP
Joined: Oct 2011
Posts: 465
Union County, PA
Is the 5-watt battery tender solar charger a good quality one? One thing I do like about that one is that it has a built in controller. Is that important?(from what I understand it is ideal to have one)


2005 Chevrolet Malibu V6
Castrol Edge HM 10w-40/ Purolator Pureone

2015 Cruze LT 1.4T
Dealer Oil/Filter
Re: Best Solar battery maintainer for non-daily driver [Re: 2James1] #4640239
01/19/18 05:02 PM
01/19/18 05:02 PM
Joined: Nov 2013
Posts: 1,968
Chicago, IL
EdwardC Online content
EdwardC  Online Content
Joined: Nov 2013
Posts: 1,968
Chicago, IL
To be honest, for a solar charger in that range, a controller isn't really necessary, I don't think that you'll run any risk of overcharging the battery. Let me try calculate this just for fun:

Let's say your battery is roughly 40Ah, with a self discharge of 5% per month, or 2Ah per month, or .0666Ah per day. The vehicle will likely draw some power constantly, let's say the parasitic drain is 0.05A, or 1.2Ah per day, for a total of 1.2666Ah per day.

The solar charger, on the summer solstice in Pensylvania will receive 15h of sunlight, and assuming it's perfectly pointing at the sun the entire time with a 100% charge efficiency, the .27A charge current will recharge 4.05Ah of capacity. Arguably, you won't get anywhere near that power.

I've used the cheap-o $15-$20 5 watt chargers with no issue. I think the only thing to take note is that it has a built in blocking diode so that it doesn't discharge the battery when off, most of them do have it.


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