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Old 03-23-2014, 02:06 PM   #1
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Adding a second battery....

The Toyhauler we bought to try this year is an 04. Does anybody now how the older onboard chargers do with adding a second battery? Didn't know if I should be concerned with how it will affect anything. Having one battery just doesn't cut it for what we do.

Thanks
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Old 03-23-2014, 02:11 PM   #2
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You should have no problems with a 2nd battery in parallel with the other
one. Try to get same size and of course same voltage!

Good luck and happy camping!
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Old 03-23-2014, 02:12 PM   #3
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Quote:
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You should have no problems with a 2nd battery in parallel with the other
one. Try to get same size and of course same voltage!

Good luck and happy camping!
X2!
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Old 03-23-2014, 02:15 PM   #4
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Thanks! I just planned on buying 2 new matching ones.
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Old 03-23-2014, 04:41 PM   #5
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Just get you a couple of battery cables at your favorite auto store with the eyelets on each end(if you buy deep cycle batteries) and hook 'em up.
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Old 03-23-2014, 09:59 PM   #6
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Make sure you buy deep cycle batteries. Regular batteries wont last as long.
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Old 03-23-2014, 10:18 PM   #7
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1. Since you are going to replace 2 batteries...why not make the move to a pair of 6V golf cart batts and get real deep cycle performance cheaply. (Sams/Costco) use a single jumper cable between the + and - of the two batts...and attach your existing cables to the remaining + & - respectively to get a 220AH 12V deep cycle battery.

2. If you have an OLD charger that runs on a FIXED output voltage...you would benefit by changing it out for a 3 stage or 4 stage smart charger which would be more efficient and give you more life from your new batteries.

3. While your existing charger can charge double the capacity as you plan...it will take twice as long as it does now assuming it was not oversized to begin with. Ideally a charger should provide around 20% of capacity...for a 200ish amp hour dual battery bank this would mean a 40 amp charger would be about ideal. Don't know what you have now...but the IOTA DLS 45/iq4 with the 4 stage smart charger would be a good match FOR EXAMPLE. Amazon.com: IOTA DLS-45/IQ4 12 VOLT 45 AMP 4 STAGE AUTOMATIC SMART BATTERY CHARGER / POWER SUPPLY: Automotive

Hope this helps you make a good decision.
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Old 03-23-2014, 11:32 PM   #8
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I had three 12v batteries in my 2002 TT with a 35 amp converter and it never had an issue.

But I'll second the dual 6v option. In a few years when my current batteries go south I'll end up with four 6v batteries in a paired series/parallel setup.
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Old 03-23-2014, 11:52 PM   #9
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I had three 12v batteries in my 2002 TT with a 35 amp converter and it never had an issue.
I agree that your experience is both possible and likely.

My point was NOT that it wouldn't work....but that it would take longer. For example...lets take ONE 100 amp battery depleted to 50%. It would take your 35 amp charger 1.5 hours to replace those amps (in a perfect world... of course in the real world it will take about 3 hours.) Now let;s increase that bank to a 3 battery 300amp hour bank...depleted to 50% so we have to put back 150 amp hours...which means 4.3 hours of charging in a perfect world.
If yer boondocking that is a real pain in terms of the real world hours extra needed to get to 100%.
So...his existing converter amps will work...but 45 would be better in time listening to noisey generators, cost of gas, wear on the generator...and battery life since he would be getting a smart charger along with more amps. For around $150 bucks...well worth considering.
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Old 03-24-2014, 12:51 AM   #10
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I didn't say it was fast, but it worked. Actually I never timed it on the converter, what I did was carry a separate battery charger, had a multi position switch so I could run off one, two in parallel, or tie all three together. During the day I'd turn the switch to the single battery, then put the charger on the other two paralleled batteries at a 12 amp rate. Never took more than a few hours for the charger to auto off. Not sure how deep I discharged them percentage wise, but it worked for me.

Few hours of tv, overnight running an inverter powering my cpap. The panel would show 2/3 in the morning, however accurate that was.
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