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Old 07-01-2018, 02:44 PM   #1
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Join Date: Nov 2012
Location: Salt Lake City
Posts: 101
Best way to maintain 4D house battery. Help please

Hello all! This may be a dumb question but here goes. I have a 2003 7.3, 4x4 EB 50 SMB.

What is the best way to maintain my 4D house battery.

If I keep it plugged in all the time, without the charger switched on, does this do anything for the battery?
Should I leave it plugged in all the time with the charger enabled? If I do this this, in the winter it gets too cold and faults, in the summer too hot and faults.

I have had my SMB 6 years and have never really know the proper way to maintain the battery.

Thanks in advance for your help!


"Not all Those Who Wander are Lost"
2003 Ford SMB EB-50, 7.3L 4x4, "La Mulita Blanca"
2006 Land Rover LR3 SE/HD
2010 BMW GSA 30th
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Old 07-01-2018, 03:52 PM   #2
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During the winter and off-season times how long is it in between the use of your SMB?
I'm thinking possibly take the battery inside to your garage and put it on a proper charger.

2001 E350 PSD w/ a bunch of stuff.
And had three other E350s...
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Old 07-01-2018, 04:49 PM   #3
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Depends on the battery type. With AGM's basically you should keep them fully charged as much as possible and try to control the cycling. Keep the DOD above 50% or about 12.2v. I rely on the solar to keep em topped off. If I leave the fridge on during the night while at home, I always plug in so it doesn't cycle the batteries. I avoid high amp charging (unless they need it) and use the maintenance level charge option my inverter has. You can always use a separate maintenance charger. Check out this file:
2006 Ford 6.0PSD EB-50/E-PH SMB 4X4 Rock Crawler Trailer

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Old 07-01-2018, 07:20 PM   #4
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Location: So Cal
Posts: 3,699 is the best way if your van is parked outside...

.....and DaveB made another good point..many Inverter/chargers have switches to limit charge current...pretty sure the tripplite RV ones do...just switch in to 25A of whatever minimum current is if you happen to have one of those.
2008 E350 RB passenger 4WD SMB penthouse
2013 KTM 350 EXC
2008 KTM 250 XCF-W
2000 KTM 200 EXC
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