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Old 07-13-2014, 04:57 PM   #11
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When we bought our Jayco new in '97 it had only one group 27 deep cycle battery. With two young daughters and a wife, it didn't take long to drain it dry. I ended up replacing the single group 27 with two group 24 deep cycle 12V batteries and it nearly doubled the time before needing recharge. For that purpose I packed along an 1800 watt gen. that I'm about to replace with a honda eu2000i inverter. When it comes to batteries, the more you have the longer you'll last.

I pulled into a public dump station last year and a family pulled in with a trailer that I counted 5 batteries mounted on it. I can't even begin to imagine what they did to his tongue weight but needless to say he impressed me!
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Old 07-13-2014, 05:02 PM   #12
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Granted there are no 2 batteries that have the same internal resistance, but when they are new and installed together (with proper connections) they will usually stay close to each other, provided that they are properly maintained.
When I said new I should have mentioned same mfg date.

Enjoy

Don
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Old 07-13-2014, 06:58 PM   #13
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Here is my two cents on what to expect performance wise when camping off the power grid...

Your two 12VDC Interstate Batteries connected in parallel will give you around 170AHs capacity and will produce 12VDC @ 25AMPS for around 280 minutes (4.6Hrs) before being totally discharged. Of course you will would never want to fully discharge your batteries so you can expect to use half of that or 2.3HRS of use.

If you replace them with two each 6VDC Golf Cart batteries connected in series to give you 12VDC you will get around 220AHs capacity. The bigger thing is these two batteries will produce 12VDC @ 25AMPS for 447 minutes (7.5Hrs) before totally being discharged. You will be able to use half of this or 3.75 hours of use. The golf cart batteries are very rugged and will hold up much long than the Interstate batteries will over time.

Keep in mind 25AMPS of 12V DC Battery power is alot of juice. You will most likely only use less than half that of that much current in your daily use camping off the power grid.

My battery bank is 255AHs capacity and I have planned on what I can use in my trailer to drain my batteries down to their 50% charge state by 8AM the next morning. This is when I connect my 30AMP trailer directly to the 120VAC Outlet on my 2KW Honda Generator using a RV30A-15A Adapter(WALMART) and can then run my smart mode on-board converter/charger unit to re-charge my battery bank back up to their 90% charge state in a three hour generator run time. Now I can do all of this all over again for the next day/night run off my batteries.

It does take some planning on what you may want to do when camping off the power grid...

My camping off the power grid story...

Roy Ken
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Old 07-13-2014, 07:42 PM   #14
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I'm gonna get another 12v from my dealer. I just took delivery a few weeks ago, so I'm sure the batteries will be close enough as far as age. I thought about switching to a 6v system, but it seems like a waste of the new 12v battery that I have. I'll see how this setup works for me and possibly switch to a 6v system in the future.
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Old 07-13-2014, 07:51 PM   #15
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I'm gonna get another 12v from my dealer. I just took delivery a few weeks ago, so I'm sure the batteries will be close enough as far as age. I thought about switching to a 6v system, but it seems like a waste of the new 12v battery that I have. I'll see how this setup works for me and possibly switch to a 6v system in the future.
Thats the same choice I made. No regrets so far, but I have added solar so i canoff grid for much longer.

For future readers of this sting, i have also read a added benifot in that if a cell in one of your twin 12 v shorts out, you can disconnect one the the two batteries and you are back in business
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Old 07-14-2014, 12:56 AM   #16
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my advice - based on 4 days of boon docking this past weekend - buy a 2nd 12V battery, then when they wear out, replace them both with 6v deep cycle batteries.

In the mean time, invest your money in LED lights. a few years ago with fresh 12V batteries and old lights, I would barely go a 2 night weekend before my batteries would start to fade. I just replaced all my lights with LEDs and my worn out batteries with two 6V deep cycle (NAPA) batteries. The batteries were barely 1/2 gone after 4 days, and that was AFTER I put the slide in to come home. LEDs rock!!

Tim
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Old 07-14-2014, 04:06 PM   #17
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so many variables! I plan on adding solar in 6 months or so- does that change anything?
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Old 07-14-2014, 04:30 PM   #18
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It only changes things if your batteries will outlast your days of un-available sunlight. And I'm assuming that your array will charge fast enough to top off the batteries daily.
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Old 07-14-2014, 05:59 PM   #19
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Step 1. Change all bulbs to LEDs
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Old 07-14-2014, 06:57 PM   #20
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I added a third GP24 12VDC Interstate that someone gave me. That gave me 255AHs of battery capacity. Been running my off-road trips just fine with 255AHs of batteries.

Roy Ken
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2010 F150 FX4 5.4 GAS with 3.73 gears - Super Cab - Towing Package - 2KW Honda EU2000i Gen
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