Reserve Capacity Question (Battery)
I am trying to compare battery's and they do not make it easy. Battery states: Reserve Capacity as 125 minutes at 75A. I need to know what it is at 25A? Can anyone help? Please.
Forum Discussion
While a flooded group31 cannot be compared to a golf cart battery, I had bought a USbattery group31 that was plastered with the words Deep cycle.
Long story short the thing required ridiculous absorption voltages and Vabs durations, and then still required 16v EQ charges every 14 deep cycles, before I took it out of service at about 500 deep cycles.
It took a bunch of testing and raising voltage and observations to find an acceptable (to battery performance) regimen, which was a heck of a good learning process, but basically the charge efficiency factory of that battery was extremely poor, and if I did not take the time and expend the effort to figure out what was required to get decent service from it, in daily deep cycle duty, it would have achieved NOwhere near those 500 deep cycles.
This battery ( the screwy31) is still alive, it uses a LOT of water, is fed by a 100 watt solar panel on a cheapo charge controller that seeks to then hold 14.7v for 2 hours each day. It might get cycled 5 to 10Ah each night 76 nights a week, occassionally deeper.
I can tell when it is low on water, as the morning voltage is in the 12.9's. After filling it is in the 12.5's.
A battery which is easy to fully charge, will stand a much better chance of getting fully charged by those not much concerned about their battery longevity, and thus not only use less energy in the recharging, but last significantly longer too.
But The screwy 31 is now approaching 5 years old, and if I were completely ignorant of its performance, and asking it to power just 5 to 7Ah each night, I could say it is still going strong, and fine, just fine.
But it is not. Though there is certainly bliss in ignorance.
Interstate GCs as to who makes their batteries, likely varies regionally.
I put a pair in a friends RV, with an Iota DLS-45 and alternator as the only charging sources. They weighed the same as Trojan t-605s at 58 Lbs and had some similarities in case design, but more recently someone posted that the interstate GC-s resembled other manufacturer batteries even more. IF trojan is making some costco interstate GC-2's in some regions, they are clones of the t-605, not the venerable benchmark t-105 which weighs 4 Lbs more.
I checked these costco interstate GC-2s about 6 weeks ago before a long roadtrip and gave em an EQ, but the SG was at the bottom of the green before the EQ and did not take long to get into the middle of the green. HArd to say just how much and how deep they are cycled, but I know the owner would have no issues running them to 10.5v or deeper. My instructions were to plug in for 3 days after an outing then hit the main disconnect.
Long story short the thing required ridiculous absorption voltages and Vabs durations, and then still required 16v EQ charges every 14 deep cycles, before I took it out of service at about 500 deep cycles.
It took a bunch of testing and raising voltage and observations to find an acceptable (to battery performance) regimen, which was a heck of a good learning process, but basically the charge efficiency factory of that battery was extremely poor, and if I did not take the time and expend the effort to figure out what was required to get decent service from it, in daily deep cycle duty, it would have achieved NOwhere near those 500 deep cycles.
This battery ( the screwy31) is still alive, it uses a LOT of water, is fed by a 100 watt solar panel on a cheapo charge controller that seeks to then hold 14.7v for 2 hours each day. It might get cycled 5 to 10Ah each night 76 nights a week, occassionally deeper.
I can tell when it is low on water, as the morning voltage is in the 12.9's. After filling it is in the 12.5's.
A battery which is easy to fully charge, will stand a much better chance of getting fully charged by those not much concerned about their battery longevity, and thus not only use less energy in the recharging, but last significantly longer too.
But The screwy 31 is now approaching 5 years old, and if I were completely ignorant of its performance, and asking it to power just 5 to 7Ah each night, I could say it is still going strong, and fine, just fine.
But it is not. Though there is certainly bliss in ignorance.
Interstate GCs as to who makes their batteries, likely varies regionally.
I put a pair in a friends RV, with an Iota DLS-45 and alternator as the only charging sources. They weighed the same as Trojan t-605s at 58 Lbs and had some similarities in case design, but more recently someone posted that the interstate GC-s resembled other manufacturer batteries even more. IF trojan is making some costco interstate GC-2's in some regions, they are clones of the t-605, not the venerable benchmark t-105 which weighs 4 Lbs more.
I checked these costco interstate GC-2s about 6 weeks ago before a long roadtrip and gave em an EQ, but the SG was at the bottom of the green before the EQ and did not take long to get into the middle of the green. HArd to say just how much and how deep they are cycled, but I know the owner would have no issues running them to 10.5v or deeper. My instructions were to plug in for 3 days after an outing then hit the main disconnect.
