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IdahoBoy View Drop Down
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Posts: 65 		Direct Link To This Post Topic: Battery Boxes
    Posted: 04 Jul 2017 at 5:01pm
I'm going to replace my one 12volt battery with two 6volts. I think the 6volts are larger than the 12 volt so I'm wondering if anyone knows off-hand if the battery rack that came standard on my 172 will accommodate the larger battery boxes or will I have to have it altered? I have to order the boxes so I don't know their dimensions. I'm going with Interstate batteries.

Thanks in advance.
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furpod View Drop Down
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Posts: 6128 		Direct Link To This Post Posted: 04 Jul 2017 at 5:54pm
You have 2 choices, two separate boxes, or a single end-to-end box that holds both. Either way, 2 6's fit.
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ToolmanJohn View Drop Down
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Posts: 451 		Direct Link To This Post Posted: 04 Jul 2017 at 5:58pm
 I am not sure about the tray dimensions. Just measure the width, length. Height shouldn't be an issue.

Get two boxes that fit end to end, or one double box that holds two to save more space, also the double box is easier to wire. 

6 volt batteries weigh about 62 pounds each. A 12 volt will weigh about 52 pounds each.  
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john in idaho View Drop Down
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Posts: 611 		Direct Link To This Post Posted: 04 Jul 2017 at 5:58pm
Drill holes in the bottom so they don't collect water.  Also makes it easier for the wasps to get in......
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GlueGuy View Drop Down
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Posts: 2629 		Direct Link To This Post Posted: 04 Jul 2017 at 6:24pm
The standard batteries (usually one or two 12V batteries) are size 24. The 6V batteries that people have been talking about on this list are size 24.

Figure out your battery capacity by calculating how many watt-hours (WH)each one is by multiplying the AH rating by the voltage. Then you can just add up WH regardless of voltage or configuration (series/parallel does not matter when you use WH).

E.G. 6V * 225 AH = 1350 WH

an equivalent capacity 12V battery would be about 112 AH (12V * 112 AH = 1344 WH)

You want longer run times, get more WH.
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sailor323 View Drop Down
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Posts: 281 		Direct Link To This Post Posted: 05 Jul 2017 at 6:42am
Originally posted by GlueGuy

The standard batteries (usually one or two 12V batteries) are size 24. The 6V batteries that people have been talking about on this list are size 24.

Figure out your battery capacity by calculating how many watt-hours (WH)each one is by multiplying the AH rating by the voltage. Then you can just add up WH regardless of voltage or configuration (series/parallel does not matter when you use WH).

E.G. 6V * 225 AH = 1350 WH

an equivalent capacity 12V battery would be about 112 AH (12V * 112 AH = 1344 WH)

You want longer run times, get more WH.

Your arithmetic leaves out a critical factor.  When using 6v batteries, you need 2 of them to make 12 volts.  So, 12 X 225 = 2700 WH 2 group 24 12v batteries provide about 160 aH, 2 group 27 about 210 aH
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sailor323 View Drop Down
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Posts: 281 		Direct Link To This Post Posted: 05 Jul 2017 at 6:44am
This is the box I use http://www.allbatterysalesandservice.com/browse.cfm/4,576.html
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StephenH View Drop Down
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Posts: 6288 		Direct Link To This Post Posted: 05 Jul 2017 at 7:19am
Originally posted by john in idaho

Drill holes in the bottom so they don't collect water.  Also makes it easier for the wasps to get in......

Wasps are less likely to get in through the holes than they are through the openings where the wires pass.  I have dual 6V batteries in separate cases. The lids have large openings. The holes I drilled are small.
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TheBum View Drop Down
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Posts: 1407 		Direct Link To This Post Posted: 05 Jul 2017 at 10:49am
We run dual 6V batteries in our 179 and also have separate battery cases. The cases cost something like $10 apiece at Batteries + Bulbs, which is also where we bought the batteries.
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GlueGuy View Drop Down
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Posts: 2629 		Direct Link To This Post Posted: 05 Jul 2017 at 10:57am
Originally posted by sailor323

Your arithmetic leaves out a critical factor.  When using 6v batteries, you need 2 of them to make 12 volts.  So, 12 X 225 = 2700 WH 2 group 24 12v batteries provide about 160 aH, 2 group 27 about 210 aH
I assumed it goes without saying that you need 12 volts no matter what. 

So if you are using 6V batteries, you will need a minimum of 2. If you want to increase capacity with 6V batteries, you will have to do that in multiples of 2. That means 2, 4, 6, 8, and so on.

If you are using 12V batteries, you can add in any increment, 1, 2, 3, 4, 5, and so on. The difference will be that regardless of how many 12V batteries you're using, they will be connected in parallel.

The battery math stays the same. When you are comparing AH, you're not really looking at capacity unless you are also looking at voltage. That means watt-hours.
bp
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