Deep Cycle 12V Batteries

[CA_Traveler]

12V deep cycle batteries are becoming popular for 48V golf carts. Here’s a comparison of 6V vs 12V flooded deep cycle batteries for 12V RV house battery bank. This suggests that 12V deep cycle batteries may become more popular in RVs.

Crown CR-GC150 12V deep cycle – 4 batteries 150 Ah each:
364 sq in, 324 lbs, 600 Ah, $700

Trojan T125 6V deep cycle – 4 batteries 240 Ah each:
294 sq in, 264 lbs, 480 Ah, $724

Trojan T105 6V deep cycle – 6 batteries 225 Ah each:
439 sq in, 372 lbs, 675 Ah, $774

The numbers are the totals for the given battery bank and the size is the footprint of the combined batteries.

[wa8yxm]

The only "Complaint" (note the quotes is that you used CROWN CG-12s and Trojan CG-2s Might have been more fare if you used Interstate or Deaka CG-2's

or better yet Chrowns.

EXCEPT FOR PRICE..... Let me do some math. This is higher level than I've done in a while (Least common demonator stuff)

150/220 Let's go with 3 pair GC-2 (660 amp hours) and 4 GC-12s (600 amp hour)

The only real difference other than price is 10% Amp hours. Both will perform nearly identically If the GC-12's get you there for less $$$. GO FOR IT.

[ktmrfs]

MEXICOWANDERER wrote:
When I tested cyclability of Trojan T-105 Golf car versus floor scrubber batteries in the early nineties (32 batteries each type) it was found the golf car batteries significantly out cycled the scrubber battery.

= They lasted longer and the difference between the 2 exceeded 15%

The significance was attributed to excess acid of the T-105

The scrubber was designed to fit floor scrubber machines -- a very limited amount of room. Per cubic inch of space taken the scrubber batteries gave significantly more ampere hours at the ten hour rate and significantly less at the 100 hour rate than the golf car battery.

No studies were conducted with improperly maintained batteries of either type.

your data is consistent with the life chart for trojan 12V deep cycle vs 6V GC. when discharged to 50% Although the trojan cycle life for 12V is probably long enough for many user that the battery will die for other reasons before dying from cycle life.

12V "true" deep cycle Advantage- much better when used in applications having high draw, microwave etc.

Disadvantage:
lower cycle life, many not be an issue for many applications
Not as readily available as GC.

Bigger one is that Trojan, at least the last data I had indicated the 12V does NOT like being discharged below 50%. While the GC still has a life cycle >500 cycles at 75% DOD. So useable AH advantage goes to the GC.

But then my experience is that 2GC don't like driving a 900W microwave once down below about 80% SOC. and others have seen similar. 4GC will work down to near 50%. I suspect a pair of 12V would run the microwave fine down to 50%. Each battery only supplies 50% of the draw, and much lower resistance.

So...... pick what fits your application. Have to trade off something.

[BFL13]

That seems to confirm that the 12v T-1275s were better at high draw with inverter (microwave etc) than the 6v batts.

Gets complicated choosing the optimum set for your house batts if you camp with a mix of high draw inverter, low draw RV stuff, and with a mix of shallow cycles (with solar) and deep cycles (50-90s no solar).

[MEXICOWANDERER]

When I tested cyclability of Trojan T-105 Golf car versus floor scrubber batteries in the early nineties (32 batteries each type) it was found the golf car batteries significantly out cycled the scrubber battery.

= They lasted longer and the difference between the 2 exceeded 15%

The significance was attributed to excess acid of the T-105

The scrubber was designed to fit floor scrubber machines -- a very limited amount of room. Per cubic inch of space taken the scrubber batteries gave significantly more ampere hours at the ten hour rate and significantly less at the 100 hour rate than the golf car battery.

No studies were conducted with improperly maintained batteries of either type.

[BFL13]

I was pleased with my two much-used (beat up) T-1275s (from a golf car set of four) that lasted me five years in the 5er. I think starting with new T-1275s would be great.

Actually, the golf car shop had either four T-1275s to make the 48v or else six 8 volt batts. They said (was in 2013) they were going to the 8v choice because that gave the golf cars more scoot. Don't think that applies to RV house battery banks.