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Old 03-17-2015, 05:31 PM   #11
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Batteries inside a closed metal box (unless sealed and totally gasless) will try to eat the aluminum or steel around them pretty quickly but a couple of coats of a good quality truck bed liner can extend the life of the metal pretty much out to the life of the bus. And Roger the positive pressure venting above. It is recommended even for the hi tech (hi dollar) sealed units.

BTW...there are some small computer fans that draw very little juice but can move a lot of air. I am playing with the idea of a single vent line for both the house batteries (indoors hopefully) and a composting toilet. Let one small fan handle both.
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Old 03-17-2015, 06:10 PM   #12
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Use a battery maintainer to keep them charged when the bus is parked between trips, a charged battery won't freeze.
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Old 03-17-2015, 07:11 PM   #13
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i built a wooden box. vented from bottom to exit out the top. convection venting if you will. never smelled gases. my batteries charge everyday and never have condensate on top of them. dont even need a fan. the reason for this is to keep the batteries at temp of the interior. a cold battery is very low efficiency. with the batteries at ambiant of the interior of cabin, they are more efficient so they take a better dharge, hold a better charge, last longer , and the temperature corrective charge controller works better also.
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Old 03-17-2015, 07:34 PM   #14
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any battery with a charge will not freeze.

You can keep a battery charged with a time clock and a small charger. Turn the charger on 6 hours and off 6 hours. The battery will not freeze and will always be ready to go. Outside is the best way to install batteries.... Frank
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Old 03-17-2015, 08:13 PM   #15
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when a battery is discharged the electrolyte becomes very week. close to the composition of water,they can freeze solid. i draw my batterys down every night hoping for sun the next day. as far as your sealed batterys home power magazine did a piece on them and said they have a much lower freezing point. they are however very sensitive to high temps and overcharging.
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Old 03-17-2015, 09:13 PM   #16
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Quote:
Originally Posted by charles_m View Post
An insulated battery box seems like a waste of effort.
The resistance inside a battery cause heat both in the charge and discharge cycle. Insulating the box go's a long way in the northern climate.

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Old 03-17-2015, 09:36 PM   #17
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Nat--
How are you planning on housing your batteries? Insulated 'basement' Right?
That might be the best for me. Insulated battery box below the bus.
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Old 03-17-2015, 09:59 PM   #18
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Quote:
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Nat--
How are you planning on housing your batteries? Insulated 'basement' Right?
That might be the best for me. Insulated battery box below the bus.
Mine will be a custom LI-ION pack built from cells used for electric cars. They are not harmed by freezing as long as the parameters are set correctly in the battery management system.

The cells I will use are available from 20 amp hours to over 1000 amp hours. It takes 4 cells per 12 volts in your system. For versatility, I may stay with 12 volts, but may go as high as 48 volts when I get the inverter hooked up.

They will be housed in one of the bays in the belly of the bus. I will use a large ABS pelican PELICAN Case, 33-3/8 InLx28-7/16 InWx18-1/4 InD - G4785523 at Zoro Canada luggage box with wheels to hold my cells. The battery bank will be removable by simply disconnecting and removing the case.

This is for versatility. The battery bank will be able to be used in my electric car when I build it, as a silent generator on work sites, ect. It will also have the charger built into the box so I can charge it in the house, shop, or anywhere else I need to.

The battery cells.
Lithium Car Batteries Electric Vehicle EV Batteries Motors.

The compartment will be insulated and heated with a heat loop from the hot water heating system. It will have it's own thermostat to keep the battery's from over heating.

Nat
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Old 03-17-2015, 10:01 PM   #19
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We have both of our battery banks (bus and house) as AGM and are outside the bus. The vehicle AGM's are designed for 2,200 cold cranking amps. I have been told in the past that batteries inside the living area is a bad idea. Just what I have been told.
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Old 03-22-2015, 09:17 PM   #20
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While some car companies do it, having the batteries inside the bus is a bad idea. In an overcharging state or high draw they give off bad gasses. I have been there when a few batteries exploded. (Yes they will). in an enclosed space like a bus you will go unconscious fast.

One possibility if space is limited is to have the batteries in a case under the bus but accessed thru a hatch in the floor inside. that way you can put them anywhere but have them safely outside of the living quarters.
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