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Kirkland battery question (amp hours)

Canuck_in_NJ
Explorer
Explorer
Hey everyone!

Will be picking up my battery monitor next week and I will have to enter how many amp hours my battery bank holds.

I have 2 Kirkland (Costco 6volts ) 2-GCS

The only real info on the battery states reserve capacity @ 75amps is 107. ( I assume the 107 is 107 minutes)

Is there a calculation I can do to find my actual amp hours?

Thanks
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10 REPLIES 10

Lwiddis
Explorer
Explorer
โ€œCan you teach a man to fish?โ€

I canโ€™t but you all already assisted the OP who, IMO, needs to do some reading, internet searching etc. before asking questions.
Winnebago 2101DS TT & 2022 Chevy Silverado 1500 LTZ Z71, WindyNation 300 watt solar-Lossigy 200 AH Lithium battery. Prefer boondocking, USFS, COE, BLM, NPS, TVA, state camps. Bicyclist. 14 yr. Army -11B40 then 11A - (MOS 1542 & 1560) IOBC & IOAC grad

BFL13
Explorer II
Explorer II
naturist wrote:
Canuck_in_NJ wrote:

Can you teach a man to fish?

Is there a calc to get it from the 75 amps? Is it usually listed with a 25/amp draw?


Love to, but the problem is that there is no calculation to get there from either of those datapoints.

Both the 75 and 25 figures are a function of "wire size" or rather terminal and buss-bar size while amp-hour capacity is a function of plate surface area, thus they are completely independent and unrelated variables.


RC is at 25 amps. EG, a battery with RC of 160 minutes has 66.6AH. (at the 25 amp rate--NOT the 20 hr rate)
(25 x 160 = 4000 amp- min or 66.6 AH)

Golf car batts use 75 amps as their rate, not 25. RC 107 is 133AH at the 75 amp rate. (not the 20 hr rate for AH)

The 75 and 25 are just the "rates" in amps like the 20 hr rate is in amps. Peukert calculation will get the AH to compare the 75 and 25 with the 20 hr rate.

The 20 hr rate for 208AH is 208/20 = 10.4 amps. Naturally the battery will go flat sooner with a 25 amp draw and much sooner with a 75 amp draw.

A 100AH battery has 5 amps as the 20 hr rate. But at 25 amps it will only do 2.7 hours

Going from either RC rate in minutes to AH at the 20 hr rate can be different with different battery brands and types because of different Peukert Factors among batteries.

It is all in this bible:
http://www.bestconverter.com/Books_c_67.html
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on Ford E350-460-7.5 Gas EFI
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2. 1991 Bighorn 9.5ft Truck Camper on 2003 Chev 2500HD 6.0 Gas
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3_tons
Explorer
Explorer
time2roll wrote:
I agree 208 is the realistic number.


X2, 208a/hr per 6volt battery, with a 208a/hr combined total when two are wired in series to arrive at 12v.

naturist
Nomad
Nomad
Canuck_in_NJ wrote:

Can you teach a man to fish?

Is there a calc to get it from the 75 amps? Is it usually listed with a 25/amp draw?


Love to, but the problem is that there is no calculation to get there from either of those datapoints.

Both the 75 and 25 figures are a function of "wire size" or rather terminal and buss-bar size while amp-hour capacity is a function of plate surface area, thus they are completely independent and unrelated variables.

wa8yxm
Explorer III
Explorer III
GC-2's are from about 210 to 230 but I agree 208 is a good answer. oVer time and with the use of a hydrometer you may "Fine tune" that but 208 is a good starting point.
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Canuck_in_NJ
Explorer
Explorer
Thanks everyone
2012 Dodge Ram 3500
2018 Jayco Octane 260

BFL13
Explorer II
Explorer II
https://www.usbattery.com/products/6-volt-batteries/us-1800-xc2/
1. 1991 Oakland 28DB Class C
on Ford E350-460-7.5 Gas EFI
Photo in Profile
2. 1991 Bighorn 9.5ft Truck Camper on 2003 Chev 2500HD 6.0 Gas
See Profile for Electronic set-ups for 1. and 2.

time2roll
Explorer II
Explorer II

Canuck_in_NJ
Explorer
Explorer
grizzzman wrote:
208 AH is the easy answer.


Can you teach a man to fish?

Is there a calc to get it from the 75 amps? Is it usually listed with a 25/amp draw?
2012 Dodge Ram 3500
2018 Jayco Octane 260

grizzzman
Explorer
Explorer
208 AH is the easy answer.
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640 Watts Solar. Costco CG2 208 AH and Lifepo4 3P4S 150 AH Hybrid. ElectroDacus. Renolagy DC to DC charger. 2000 Watt Inverter.
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