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Discussion Starter #1
Got a question about what you guys think is the best hard wired battery tender for my truck. Got a 2019 3500 cclb bighorn cummins with a space kap in the back. The reason for needing the battery tender is for the diesel heater in the back.
 

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Got a question about what you guys think is the best hard wired battery tender for my truck. Got a 2019 3500 cclb bighorn cummins with a space kap in the back. The reason for needing the battery tender is for the diesel heater in the back.
I have this one permanently installed, it has served well since 2014 with zero problems.

Here is a link.
022-0157-1
 

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I have used the Deltran Battery Tenders for years. Have one on my CJ and ATV. They have worked well for me.
 

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So you have a diesel heater like a Webasto heater, and the fan pulls off of the truck batteries, but you can plug in the truck at the same time your running the heater and use a charger to keep the truck batteries charged?
If that's the case, you want a charger with more amps than a maintainer if you're using enough juice without the truck running to require charging.
And since your presumably running the heater when its cold out and risk the truck not starting if it's not plugged in, then you'd be best off to put a house battery or 2 in the system and a charging relay.
Regardless, for a charger for your purposes unless my assumptions are wrong, I'd look at a single or dual bank onboard marine charger/maintainer. 10amp min per battery.
 

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Discussion Starter #7
It is a Webasto heater and I only plan on keeping it just above freezing when it's parked and turn it up when I start driving. That's what I plan to do with the battery maintainer is to have it tied in with the block heater cord so when I park it for the night or the weekend I hope to not have dead batterys.
 

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Just checking, is this heater for the bed area or inside the vehicle? If you are worried about the interior, the diesel 2019's have a built in space heater to rapidly heat the cab. If this is for the outside covered bed, then maybe a more powerful charger than a tender?
But I do like the idea of a permanently mounted vehicle tender that can be spliced into the block heater cord, so you can warm the motor and charge the batteries at the same time.
 

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It is a Webasto heater and I only plan on keeping it just above freezing when it's parked and turn it up when I start driving. That's what I plan to do with the battery maintainer is to have it tied in with the block heater cord so when I park it for the night or the weekend I hope to not have dead batterys.
So, it's not a mobile office/shop that you'll heat for hours while parked somewhere throughout the day?
Then a maintainer will probably do the trick depending on how cold and how much the heater runs. But for the $ you have sunk into your rig and setup, a $150 10 amp charger/maintainer will doo a better job if you ever are on the bigger end of power consumption vs plugged in time.
 

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Lots of folks who run Webastos and the like don’t have the luxury of being plugged in.

On my daily with a single Group 31, just 30mins of the Webasto coolant heater is enough in 0F/-20C to ensure the windshield is defrosted and the coolant is warmed up enough so the grids don’t even fire. Instant warm air out the cabin vents when the truck is started is a bonus, as long as one remembers to leave the dash controls on the “heat” or “defrost” position.

Another useful benefit to hot coolant actively circulating through the head/block is that the fuel & ATF are warm, and the engine oil as well - if one points the Webasto combustion exhaust at the oil pan.

In -40, it takes almost 60mins to do all the above.

On a storage rig with temperature sensitive contents/fluids, that’s parked outside for lengthy periods, or used to sleep in, I install a Webasto coolant heater and/or a Webasto cabin air heater, powered by a dedicated deep cycle reserve battery. Usually AGM, so it can be mounted discreetly in the interior if underhood space is limited. Recharge mode is operator choice; either recharge when close to a power source, or a 3 way high amp switch downstream of the alternator.

Both types of units have coolant temp and cabin air temp thermostats, as well as temp maintenance modes.

Absolutely no need to be dependent on an AC power source in the field or on the road.
 

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Discussion Starter #11
It is a diesel air heater in the back of the space cap. It is just to keep all my supplies in the back from freezing. Mainly all my furnace parts and glues. There might be the odd time I might crank it if I have to do some work in the back. But the main reason for the maintainer is when the truck is parked at night and the weekends.
 
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