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Old Dec 30, 2022 | 01:37 PM
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Battery Tender

I posted this in the Super Duty forum too. Should have just posted here. Anyway. I want to recommend a solar powered battery maintainer to a buddy of mine with one of these trucks. He has a parasitic draw that I'm trying to help him with, but I'm in CA and he's in rural TX. Maybe he can find the draw, but as insurance, I think a battery maintainer would be useful. He's off grid and only uses the truck occasionally. Any suggestions? Can he plug in to the 12v receptacle? If it needs to be on a battery, can it be just one?
 
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Old Dec 30, 2022 | 03:02 PM
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I've been happy with this unit. It charged my batteries from dead

Amazon Amazon
 
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Old Dec 30, 2022 | 03:13 PM
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Everyone I know got a 25% off coupon for Harbor Freight for this weekend, use that and get the solar panel kit, plugs onto your battery and will charge both even on cloudy days: https://www.harborfreight.com/100-wa...kit-63585.html
 
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Old Dec 30, 2022 | 04:14 PM
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The tender only needs to be physically hooked up to one battery as they are wired together to act as one, single large battery. As long as the wiring between the batteries is in serviceable condition.
 
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Old Dec 30, 2022 | 04:50 PM
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Originally Posted by Bitterroot Diesel
I've been happy with this unit. It charged my batteries from dead

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
Wow nice! It’s got AGM and Li modes as well.
 
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Old Dec 30, 2022 | 04:55 PM
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Small world. I put that exact solar setup on my 5th wheel kingpin and wired it into the junction box in it where the 12v lead from the 7 pin branches off to the battery



Panel and charger


Panel installed on kingpin


Before mounting the controller up under the kingpin where it's visible by just looking up

All charged up, no more worries about the gas detector, auto level, LP tank selector and other accessories' parasitic draws draining the battery again



 
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Old Dec 30, 2022 | 06:57 PM
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Originally Posted by Wes444
Small world. I put that exact solar setup on my 5th wheel kingpin and wired it into the junction box in it where the 12v lead from the 7 pin branches off to the battery



Panel and charger


Panel installed on kingpin


Before mounting the controller up under the kingpin where it's visible by just looking up

All charged up, no more worries about the gas detector, auto level, LP tank selector and other accessories' parasitic draws draining the battery again
Did you get the 20w ,30w, or 50w ?
 
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Old Dec 30, 2022 | 07:16 PM
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@Wes444 Are all the batteries the same type i.e. lead-acid, AGM or Li? If not, which mode do you choose?
 
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Old Dec 30, 2022 | 08:19 PM
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Originally Posted by jstihl
Did you get the 20w ,30w, or 50w ?
I can't remember, want to say 30w. Would have to go outside and measure to figure it out since they are different sizes based off wattage
 
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Old Dec 30, 2022 | 08:21 PM
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Originally Posted by FordTruckNoob
@Wes444 Are all the batteries the same type i.e. lead-acid, AGM or Li? If not, which mode do you choose?
The battery (single) on the 5th wheel is the standard deep cycle FLA, so used the LA setting
 
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Old Dec 30, 2022 | 08:37 PM
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Originally Posted by Wes444
The battery (single) on the 5th wheel is the standard deep cycle FLA, so used the LA setting
Oh. I thought it was charging while the trailer was connected to the truck as well. My bad.
 
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Old Dec 30, 2022 | 08:50 PM
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It could be I guess, since it's tied into the 7 pin junction, but since it's pretty much always topped off when I hook up I don't worry about it's trickle back feeding to the truck's AGMs
 
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Old Dec 30, 2022 | 08:55 PM
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Originally Posted by Wes444
I can't remember, want to say 30w. Would have to go outside and measure to figure it out since they are different sizes based off wattage
No worries I was just curious, I might get one if they work pretty good
 
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Old Dec 31, 2022 | 07:59 AM
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How large of a parasitic draw is he seeing on his system and is he letting the GEM go to sleep before testing? The PCM alone will draw 60 mA.

Alternatively he could just drop the negatives off the batteries if it's a seldom used vehicle and that would drop the parasitic draw down to 0. At a 5% or so self-discharge rate the batteries could sit for quite awhile.

Can the panel just be set on the dash inside the truck and plugged into the power outlet? If it has to be outside the truck I could see some hassle with it.
 
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Old Dec 31, 2022 | 09:00 AM
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The link below is a good reference for identifying and eliminating a parasitic draw.

Link: https://testmeterpro.com/parasitic-d...-a-multimeter/

Brandonpdx, yes... There are panels specifically designed to be hooked up just like that. The only issue is if the only real considerations with having the panel on the interior of the vehicle is window tint or obstructions like snow, trees, etc.
 
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