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Old 04-08-2016, 08:52 AM   #11
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Not to rain on anyones parade.......but if that is aluminum.......any spilled Sulfuric acid will eat it up and create more Hydrogen Gas......more so than what the batteries are themselves are throwing out if they are wet batteries.
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Old 04-08-2016, 09:26 AM   #12
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Thanks....I do want to maintain the ability to charge them in parallel...
if you want to charge them in parallel then both banks need to have exactly the same wire lengths up to the point that they come together. In your case that is the selection switch. There is only one wire from that point on. I assume that you are using a 1-2-Both-off marine switch. That means identical length and gauge from the batteries to the switch and to the common ground. Any reasonable gauge will do.
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Old 04-08-2016, 09:27 AM   #13
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Perfect, thanks.

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Old 04-08-2016, 09:31 AM   #14
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Opie, I wonder why you have this many batteries. I don't know what kind of camping you do, and / or how you plan to recharge them. If you go camping for a couple of days and then use shore power to recharge via the factory converter / charger? I can tell you the low charging voltage as well as the inability to program to match the needs of the batteries is problematic for these cheap units. Both, in performance and providing long life to your batteries.

The first thing I would add is a good monitor and Trimetric (such as the TM-2030); without one, you will be guessing how many AH you are using or when you need to conserve or charge. This typically requires either a 100A or 500A shunt in series with the negative side to frame ground.

I would also add a 300A catastrophic fuse on the positive side.

I would also suggest getting a marine type switch that allows battery string 1, 2, both or none to be switched and connected to the negative side. I reasoned the switch or a cable if contacting the box will be less harmful that if a + was to contact. It is handy to cut all power or to only one string for maintenance.

The shunt size depends on the total amp load, whether charging or using. At around 800 A and below get a 100A shunt; over that use a 500A shunt.

You question about the wire gauge size to the WFCO, I would go with a #4. Again, in my case I have 75 Amp charger in an Inverter and don't charge across this small cable. But, I have the factory Converter / charger in place but switched off "just in case" I ever need it.

BTW, charging can be accomplished with a good charger in several hours via shore power or generator, but the time frame drove me towards solar to do this. The factory converter charger could take, actually, days to get to maybe 90% full, while PV is doing this silently and for very little dollars, over the long run.

WW
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Old 04-08-2016, 09:36 AM   #15
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Originally Posted by TURBS View Post
I didn't see any mention on venting.
That many batteries in that small of area will need plenty of venting for off gassing. 🏻️
Looks good!


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Once I get everything where it's going to sit I will cut in some vents.

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Old 04-08-2016, 09:37 AM   #16
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Acid absorbent material under the battery?
I will look into it, thanks for the suggestion.

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Old 04-08-2016, 10:17 AM   #17
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Originally Posted by Trevor43 View Post
Not to rain on anyones parade.......but if that is aluminum.......any spilled Sulfuric acid will eat it up and create more Hydrogen Gas......more so than what the batteries are themselves are throwing out if they are wet batteries.
I didn't know that and will be cautious. Thank you.

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Old 04-08-2016, 10:18 AM   #18
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Wolf,

I will address all your points this evening when I have a computer.

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Old 04-08-2016, 10:53 AM   #19
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WW, thanks for all the good info! Would you please elaborate on the purpose and importance of a "catastrophic fuse"? Perhaps a picture or two of where you placed yours and why? I've heard of this fuse on this forum before but it was a long time ago. I would really appreciate it! Thanks!! PT1655
P.S. Opie, great write up and battery box setup!
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Old 04-08-2016, 03:33 PM   #20
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Speaking of battery boxes, can you just mount battery's in the rack on the tongue of a TT?? Only have one battery and want to add another. 400watt solar, 200w portable & 200w on roof. 18 days camping 2016, 7 more the 14th on Grand lake, OK
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