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Old 09-11-2013, 08:37 AM   #1
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Battery Storage and Battery Tender

I'm in the process of installing a second 12 v battery (parallel) in our TT. We will use the TT about 5 days per month and put it in off-site storage when not in use and from Nov - Apr. I was planning on bringing in the batteries into my basement during the winter months. A couple of questions:

1) I understand that one of the differences between Battery Tender Jr. and Battery Tender Plus is temperature compensation. Is this necessary if my batteries are in a heated basement?

2) Can I connect the batteries in parallel when on the tender or should I connect each one separately (alternating every couple of weeks or so)?

Looking forward to your feedback.
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Old 09-11-2013, 08:47 AM   #2
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I have the regular battery tender and 2 12V batteries in the coach. I attach across the 2 batteries and charge both. Love it!

Use on the car left behind when we head to FL each winter.

Bill
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Old 09-11-2013, 09:17 AM   #3
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You can hook them together as long as you hook the neg lead to one and the pos lead to the other.


I just bring them in, and unhook them, check voltage and charge once a month to keep them close to full. I don't personally think you need to keep the batteries on charge all the time, just periodically to make sure they are staying topped up.

IMO
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Old 09-11-2013, 09:19 AM   #4
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This is how I set up my electrical system and the batteries stay hooked up to the converter all winter. The camper is plugged in to the house.

Fully charged, they will not freeze.
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Old 09-11-2013, 09:41 AM   #5
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I have done as you plan for the past 2 years. I bring both coach & motorhome battery into garage which is heated to 55F. I have a Tender Jr and alternate about every week or so. I don't make a big deal with number of days. When I see the green light I know that battery is "full" and I simply switch to the other one.
I have heard you should not place battery directly on concrete floor so I have them on a 2x4. I make sure water level is full in the Fall and it only goes down a little bit over the Winter since the Jr doesn't hit the batteries with high amps.
my 2008 coach battery currently reads 12.50 to 12.58 and today is in the coach with a 1.5amp HF solar charger. All seems good.
Will be adding a 2nd solar charger for the chassis battery next week just to be sure it keeps up.
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Old 09-11-2013, 10:12 AM   #6
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Quote:
Originally Posted by Tireman9 View Post
I have heard you should not place battery directly on concrete floor so I have them on a 2x4.
This has not been required since the early 1940's and just will not die.

Old Wives Tale...

Tech Tips: Battery Storage Wives

Modern battery cases do not "seep acid" from their wooden cases any more.
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Old 09-11-2013, 10:17 AM   #7
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Quote:
Originally Posted by herk7769 View Post
This has not been required since the early 1940's and just will not die.

Old Wives Tale...

Tech Tips: Battery Storage Wives

Modern battery cases do not "seep acid" from their wooden cases any more.

Thanks I will be sure to NOT pass that gem along.
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Old 09-11-2013, 10:22 AM   #8
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Quote:
Originally Posted by herk7769 View Post
This is how I set up my electrical system and the batteries stay hooked up to the converter all winter. The camper is plugged in to the house.

Fully charged, they will not freeze.
Herk, do you know if your batteries will go into float mode being that the propane detector and the radio are wired direct to the panel without a switch? Will the WFCO recognize those as a load? I know WFCO say's no load can be detected for 48 hrs, for the charger to go into float. If it detects a load it will stay in absorption @ 13.6v I leave my unit plugged in all year round at my home.
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Old 09-11-2013, 10:29 AM   #9
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Quote:
Originally Posted by gljurczyk View Post
Herk, do you know if your batteries will go into float mode being that the propane detector and the radio are wired direct to the panel without a switch? Will the WFCO recognize those as a load? I know WFCO say's no load can be detected for 48 hrs, for the charger to go into float. If it detects a load it will stay in absorption @ 13.6v I leave my unit plugged in all year round at my home.
Good question.
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Old 09-12-2013, 05:35 AM   #10
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Thx for the feedback, guys. Looks like I just need a Jr. model for the basement.
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