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Old 05-17-2018, 09:07 PM   #1
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Routing/charge control for alternator charged house battery

Hey all,

looking for advice on locating a house battery, I'm converting a passenger E350. My electrical demands for the house system are going to be relatively low (exhaust fan, LED house lights and a few USB chargers for small electronics) and I'm gonna keep everything 12V DC, no inverter. I'm thinking that a single deep cycle house battery charged off the alternator with an isolating solenoid is the right solution for me, but I'm left with a few questions.

What's the best location for the battery in a system like this? I'm thinking not only of battery location for space usage but also for cable routing as I'll need to run large gauge wire for charging between the starter batt/house batt. Is it better to mount close to starting battery to minimize the large gauge cable run? Frame mount underneath or inside? What has worked well for you all?

Also, would I need a charge controler in this system? I am assuming there is some sort of a charge control system between the alternator and my starting battery right now, is this control sufficient to also charge the house battery? or am i gonna trash my hose battery in 6mo that way?


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Old 05-17-2018, 10:06 PM   #2
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Location: Driving slowly to...
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If you use a AGM, you could mount it inside... which keeps the battery at a more even temp, better for longevity and charging.
I'd also suggest the BS7622 instead of an isolation/ Dieode device. If you are only going with one house battery (aprx 100ah) then strongly consider a 100wt solar system to keep the battery happy.

Don't forget about weight balance too. My battery bank is 200lbs + equipment.

2001 E350 PSD w/ a bunch of stuff.
And had three other E350s...
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Old 05-18-2018, 07:28 AM   #3
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I'd also consider the Blue Sea 7610 ACR instead of a solenoid type separator as a less expensive alternative to the Blue Sea 7622 mentioned above. It's available separately or with a manual switch in the Blue Sea "Add a battery" kit.

The Blue Sea separators are solid state.......solenoid type separators are clunky mechanical based devices that burn power and wear over time.

The Blue Sea web site also has nice calculators for cable sizing etc.
2008 E350 RB passenger advanced 4WD SMB penthouse
2008 KTM 250 XCF-W
2000 KTM 200 EXC
2006 Honda CRF 250X
2003 Honda Element
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