Deep Cycle 12V Batteries

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.