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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?

E
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Old 05-17-2018, 10:06 PM   #2
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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.
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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.
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Old 06-11-2018, 08:30 AM   #4
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Thanks for the tip. That BS add a battery kit is perfect. Any wisdom to share on routing the charger cable? I was planning on running underneath and inboard of the main frame rail on the passenger side and punching up through the floor near the wheel well with a blue sea pass through.
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Old 06-11-2018, 10:03 AM   #5
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Quote:
Originally Posted by ejdub View Post
Thanks for the tip. That BS add a battery kit is perfect. Any wisdom to share on routing the charger cable? I was planning on running underneath and inboard of the main frame rail on the passenger side and punching up through the floor near the wheel well with a blue sea pass through.

Wherever you can route it. Since I have about 1"+ of flooring over the sheetmetal, I made my own pass-throughs. If you can get the blue sea stuff to work, that's probably the ticket.


my pass-through design is here (in post #108):

http://www.sportsmobileforum.com/for...-10808-11.html
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Old 06-12-2018, 01:28 PM   #6
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In my ambulance all those fat battery cables come up through the floor into a cabinet right behind the driver's seat.
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