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Old 10-17-2021, 07:49 AM   #1
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Best solar batteries???

Hello fellow skoolers… I’ve been living out of my conversion for about 4 years and out of nowhere my batteries started not getting fully charged, and as soon as I put load on the they shot down super quick. I have two hundred watt panels with two 6volt Trojan t105’s and a wanderer charge controller. I’m guessing it is the batteries not the charge controller because when I put the load tester on it reads bad. The Trojans have done me well for 4 years, but they are pretty expensive. Does anybody have some favorite lead acid 6 volts they use?

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Old 10-17-2021, 08:55 AM   #2
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The best battery value by far is Duracell (actually Deka/East Penn) FLA deep cycle golf cart batteries, 2x6V, around $200 per 200+AH @12V pair from BatteriesPlus or Sam's Club.

NAPA relabels it here: https://www.napaonline.com/en/p/NBP8144 Deka self-labeled also sold at Lowes.
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Old 10-17-2021, 09:04 AM   #3
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Make sure for better longevity

charge to 100% Full most cycles, 2-3 times a week minimum, at 12V:

Absorption Voltage = (14.4V -) 14.7V better

Absorption End Point = Current change over 1 hour period of less than 0.1A

Max Absorption Time = 12 Hours

Float Voltage = 13.4V - 13.6V if long periods, 13.8V - 14.1V for say just a day

Equalization = 15.0V to 15.3V

Equalization End Point = Current change over 1 hour period of less than 0.1A

Max Equalization Time = 12 Hours

Temp Compensation = -.018V for every degree °C rise above 25C
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Old 10-17-2021, 09:05 AM   #4
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Make sure for better longevity, going below 40-50% SoC is a rare occurrence occasional emergencies.
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Old 10-17-2021, 09:07 AM   #5
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Quote:
Originally Posted by john61ct View Post
Absorption End Point = Current change over 1 hour period of less than 0.1A
Or just stop when current drops to 0.05C, or 1A per 12V pair
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Old 10-17-2021, 01:57 PM   #6
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Location: Raleigh nc
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Quote:
Originally Posted by john61ct View Post
Make sure for better longevity

charge to 100% Full most cycles, 2-3 times a week minimum, at 12V:

Absorption Voltage = (14.4V -) 14.7V better

Absorption End Point = Current change over 1 hour period of less than 0.1A

Max Absorption Time = 12 Hours

Float Voltage = 13.4V - 13.6V if long periods, 13.8V - 14.1V for say just a day

Equalization = 15.0V to 15.3V

Equalization End Point = Current change over 1 hour period of less than 0.1A

Max Equalization Time = 12 Hours

Temp Compensation = -.018V for every degree °C rise above 25C
So I have the renogy wanderer charge controller and it is “supposed” to do all these things by itself I’ve gotten 4 years out of them…. I wish it were more but what can I say. Any idea the power of those duracel batteries vs the t105’s? As well as size? I think my t105s were around 200 a pop as well
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Old 10-17-2021, 04:01 PM   #7
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Google for the Deka/ Duracell sizes

black one is the GC2 - 215AH Deka Pro-Master GC10,

gray one is the EGC2 - 230AH called the GC15,

a 235AH is the GC25

Deka delivers a quality battery, especially for lead, and for the price. But if you can get T-105s locally for within say 15% of the per-Ah price, go for that.

Other top notch true deep cycling FLA makers besides EPM and Trojan include U.S. Battery, Crown and Superior.

Rolls/Surette is in another league and priced accordingly.


_______
Renogy is not great, they just market relabeled low-ball cheap chinese.

They used to have great CS attitude, now not so much.

But never fully trust any charge source, even with an $800 charger, always verify periodically at the bank posts with your own separate known-good DMM and ammeter.
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