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Old 10-15-2013, 07:53 PM   #11
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I've used a CTEK for several years and haven't had any problems. Works pretty much like all the others... I think it charges at around 3.5A or so until the batteries hit 14.4V and then tapers off the amperage until around 1.9A and shuts off. Kicks back on when the batteries go below 12.7V and repeats. After I've taken a chunk out of the charge on mine, I'll check the water then let it run through a charge cycle, disconnect and recheck the water, then hook it back up and forget about it.
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Old 10-15-2013, 08:17 PM   #12
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Quote:
Originally Posted by EricInColorado View Post
Triguy - What voltage would you consider low enough to then attach a charger/Tender? Thx.
I like to keep the batteries above 12.37, which is what Trojan lists for the 70% mark.

So, my routine is to check and, if close to 12.37, I'll bring out the charger and let it do its thing. It usually takes a couple of months to drop that far so I charge usually once during the winter.

I should stress that my batteries are totally disconnected when in storage so there are no parasitic draws.
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Old 10-16-2013, 11:12 AM   #13
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Thanks, Triguy. I just brought my battery in the house, and will keep an eye on it. I've already spent way too much on RV accessories the last month, and would rather skip buying a Tender, if I can.
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Old 10-16-2013, 08:45 PM   #14
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That sounds like a good plan. I think you'll be fine if you can put the multimeter on the battery every 6 weeks or so to make sure its keeping a charge over time. Realistically, I think 50% SOC is the minimum to keep it healthy.
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Old 10-16-2013, 09:20 PM   #15
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I understand if Battery Tender brand is made in the USA. That will justify the price.However, if it's chinese, just order one from china freight. On sale they are around eight bucks.
Batteries are actually pretty complicated and getting knowledge in proper use, charging, etc. that directly determines battery life is essential. Just think about it, electric car batteries have huge limitations, even after tens if not hundreds of millions in research have been spent. Everything from storage temperature, number of cumulative discharges below 50%, phantom drains that exist in RV's are all considerations. Oh, and the storage on concrete is bad for a battery is just a myth. But, old wives tales die hard, no pun intended.
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