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Old 12-02-2014, 12:08 PM   #11
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I too am far from a battery expert! I was just wondering if the controller would stay on the higher voltage bulk charge cycle until the large battery was full and potentially overcharge/overheat the lower capacity one?
Actually, the "bulk charge cycle" is a lower voltage charge, done while one or both batteries are still depleted and are pulling in all the current that the charge controller can provide. Later in the process is the "absorption cycle" where the voltage has risen because the controller has the capacity to provide more power than the batteries can accept (so it throttles back). (Summarized from the Aug/Sept 2014 issue of Home Power Magazine, p55)

The biggest problem with parallel batteries - and this may not be a significant issue if both batteries are fairly new and are being charged on a regular basis - is that the self-discharge will pull each battery down as they try to recharge each other. This means it would be a bad idea to store parallel batteries over the winter without a trickle charger keeping up with the self-discharge.

Some of you probably know I am planning on doing the parallel battery thing, but using SLA batteries to avoid venting and self-discharge problems.

(An interesting aside: One summer we rented a sailboat with four 6v batteries in series/parallel. The problem was that someone hooked them up as one 18v and one 6v. I heard sizzling and smelled battery fumes and immediately called the manager. Could not believe that the boat didn't catch fire or fry the electronics. Point is - don't hook up a well charged (new) battery in parallel with a depleted older battery. One will try to charge the other, without any external charger running.)

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Old 12-02-2014, 12:12 PM   #12
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Yes, I realize one should match the batteries, both in age and capacity, my single is one year old so adding another group 29 should be okay. Just doing the preliminary planning, need to find the box as well as the battery and then cables and properly installing it.
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Old 12-02-2014, 12:14 PM   #13
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Has anyone added a second 12v battery to their 21' Escape? I'm thinking of getting another group 29 battery and vent the case into the original one under the dinette. Any thoughts or suggestions? thanks...Do I have to get a group 29 or go with a group 27 ? I already have solar.
I'm a great fan of a second battery but not of the dual 6V arrangement. I don't like putting all my eggs in one basket. So the first thing I did when I got my trailer home was add a second group 29 battery and a multi-position battery switch. Over the years on boats I've charged batteries both together and individually.

I use my batteries individually. If there's a big boo-boo and one gets run down too much the second gets used, maybe more conservatively until recharging is possible. Some may not like the work of switching batteries but it works for me.

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Old 12-02-2014, 12:16 PM   #14
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Ron, where did you get the group 29 battery and I assume yours are outside in the box?
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Old 12-02-2014, 12:25 PM   #15
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I'm a great fan of a second battery but not of the dual 6V arrangement. I don't like putting all my eggs in one basket. So the first thing I did when I got my trailer home was add a second group 29 battery and a multi-position battery switch. Over the years on boats I've charged batteries both together and individually.

I use my batteries individually. If there's a big boo-boo and one gets run down too much the second gets used, maybe more conservatively until recharging is possible. Some may not like the work of switching batteries but it works for me.

Ron
Ron, you sound like you have spent some time on a boat and are a fan of the A/B/Both switch.

(Boats are where the "big boo-boo" can leave you in "deep doo-doo".)

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Old 12-02-2014, 01:09 PM   #16
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Jim, yes on the 19 the original was in the box and the #2 went beside it. New cables were run from each to the battery switch inside. If the batteries are used one at a time it doesn't make any difference whether they're perfectly matched or not. Except if they're a total mis-match according to type that might be difficult for setting a solar charger.

I like the peace of mind knowing one battery is isolated from the other and that I always have one fully charged battery in reserve.

I know lots of folk like the high end batteries. I've always been satisfied with lower end RV batteries sold by Walmart and Canadian Tire.

And, yes Al, as a former cruiser I know all about boating boo-boos. If we were ever at a rally I'd tell you a story about how sailing from Panama to Hawaii turned into an 84 day ordeal

Ron
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Old 12-02-2014, 01:22 PM   #17
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Another possibility is if you have room in the tow vehicle (TV) engine compartment or truck bed for another battery. It would have to be isolated from the TV main battery by use of a switched relay. 12V power to the trailer would come directly from that second battery, then you can connect the umbilical at any time to use it.
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Old 12-02-2014, 01:30 PM   #18
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I've always been told that 2 batteries of unequal amperage in parallel will charge to the level of the lower of the 2. But it's only hearsay.

Obviously charging separately nullifies the above.
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Old 12-02-2014, 01:39 PM   #19
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With solar I'm inclined to have then both attached and charged simultaneously. I felt this was less complicated than installing another solar panel.
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Old 12-02-2014, 01:57 PM   #20
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i think ron from north van has the right advice.also having been a boater it was two batteries isolated by the shown switch was the way to go..this is a much simpler system and each battery is independent from the other. i.e two power source systems. one can be replaced without affecting the other. the old k.i.s.s. method. talking about batteries apparently the new 19 has it located in the front storage box. this defeats the box capacity. tongue weight seems to be the problem. solution----keep the battery in the settee and reinforce the tongue by welding to the frame just back of the hitch two pieces of steel 1/2" x 4" x36inches. this adds 30 lbs per piece and 60lbs for two. a very easy cheap fix. the frame is just over 4 inches deep and the add on is not noticeable
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