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Old 02-14-2015, 09:15 AM   #1
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Adding Second Battery to 21FBRS

Looking to pics and ideas for adding a second battery to the tongue of my 21FBRS. Space is a little tight on this small-ish travel trailer and two group 24 battery boxes simply do not fit. Trying to use the existing battery rack but starting to think this project will involve having something larger welded up.
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Old 02-14-2015, 09:20 AM   #2
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I have the 2109s and I did fit two battery boxes on the front. You need to make sure your battery box is all the way over to one side before fitting the second. Also you might have to slightly trim the boxes to fit.
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Old 02-14-2015, 09:23 AM   #3
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Quote:
Originally Posted by ddrockwood View Post
I have the 2109s and I did fit two battery boxes on the front. You need to make sure your battery box is all the way over to one side before fitting the second. Also you might have to slightly trim the boxes to fit.
Yep, the boxes will just barely fit with the handles cut off; but the tops I have are way too large. Maybe I can fabricate some sort of cover. Hmmmmmm
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Old 02-14-2015, 09:29 AM   #4
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I have the factory box tops on its tight but works. I have plans of locking the battery's down also. Haven't had time to do that yet.
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Old 02-14-2015, 01:27 PM   #5
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Make sure the batteries are the same and they are hooked up properly. Battery "B" positive to battery "A" positive and battery "A" positive to trailer positive wire. Battery "A" negative to battery "B" negative and battery "B" negative to trailer ground. It will work if both positive and negative from the same battery are attached to the positive wire and the ground but it is better if hooked positive from one battery is to trailer positive wire and the other battery negative is the ground.
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Old 02-14-2015, 01:48 PM   #6
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You could purchase a marine double battery holder and it should just squeeze between the rails of the A-frame where the battery perch is. You can also get a Torklift A7708 if you have the cash or make one up if you know someone who works in sheet metal. We did a lot more dry camping/boon-docking in our last camper so I made something like the Torklift, but large enough to hold our four 6V batteries.
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Old 02-14-2015, 02:10 PM   #7
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I did it with mine, just had to trim the handles off the boxes. I knew I was going to be doing some boon docking on a long trip between stops and wanted the extra power, however, I didn’t hook them together. I brought a charger with me and when one got low, I switched wires to the other and used an outlet in a nearby hangar to charge the other.
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Old 02-14-2015, 02:46 PM   #8
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you guys must do a lot of dry camping.Y not take a small generator like the Honda EU 2000 or Ryboi 2000
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Old 02-14-2015, 02:54 PM   #9
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I have a Honda EU 3000 I load into the bed of the pickup truck on longer trips. However, if I’m just stopping for a night or two, I don’t mess with it. I get along fine with 12v, it’s my wife who needs the 110!
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Old 02-14-2015, 03:23 PM   #10
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Easy Mod.

With the second battery we have boondocked 7 days without a charge. (We do have two generators.) The 21FBRS with LED lights puts little demand on the batteries.
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