trojan t-105

Like "Applications Engineer"

Fast and loose with "Engineer". I was referring to the real McCoy. Shirt pocket protector and all. Design engineer or production engineer, are the true backbone of the industry. All other "engineers" are book studied salesmen. They repeat rote. "Gee can you tell me something about antimony / calcium hybrid versus straight antimony alloy.

REAL ENGINEER: I don't like this because...

PLAY ENGINEER: Sorry Sir. Blurpee battery does not sell that kind of battery

Tell me something can you fax me the composition of the plate paste you use?

PLAY ENGINEER: I'm sorry sir, Blurpee battery does not reveal trade secrets

REAL ENGINEER: Hahahahahahahahahahahahahahahahahahahahahahahahahahahahahahaha

If you think you're going to get a bunch more years than most any other deep cycle battery, forget it. The life of any DC battery will compare to the care, mostly charging, and the # and depth of cycles demanded of it.
No one (except a salesman) can tell you what the life expectancy of "your battery" will be.
I can tell you that "my" interstate 6'ers (made by US Battery at that time) were 8+ yrs old, and still performing good, ...as in (fair - good - like new)

harold1946 wrote:
Thanks all. I have a man telling me that a Trojan engineer is saying the T-105 cycle life is rated at 1,500 cycles to 50% SOC.
I found it hard to believe.

Trojan chart shows the std T105 at 50%DOD having a cycle life of 1250 cycles. U.S. Batteries chart show 1100ish cycles. Other quality GC are probably similar.

The renewable energy version of the T105 shows 3000 cycles.

Now that's to 50% of initial capacity, maybe ok for a golf cart, but for us RV'rs, we'd probably be looking to replace them at 75% or so.

Still, I'd expect 300-500 cycles at 50% DOD as "useable" life, and with one pair, I'm nearing that range and they are still adequate.

Gale Hawkins wrote:
We replaced our Oct 2006 this year (2014) but if used on a golf course we would have had to replace in 2012. Six years is pushing the limits on this technology.

I don't have correct detail on this, but maybe somebody here can explain how they do it.

The golf car dealer where I got my used T-1275s was using a measurement in time the batts would last while driving around. Once the four batts (with 12v T-1275s) or 6 batts (using 8v batts) could not last that long, they swapped out all the car's batts and put new ones in. The golf car dealer and I gather golf courses, have some sort of meter measuring gizmo that simulates driving around so they can measure the time the golf car is good for.

ISTR the cut-off was 100 minutes minimum? My used ones were marked as 86 min. When I did my load test for AH it came out in the mid-80% of original AH rating, so the golf car method seems to get about the same % or else that 86 of 100 was a coincidence if the car when new gets way more than 100 ---I don't know how that all works. (I then "recovered" them to 90% and they are still good)

Anyway golf courses have their own way to know when to replace the batteries, and it is different from the way RVers decide that, where there is no exact cut off for an RVer where some will keep using a battery that has lost x in capacity, while others will toss it.

RVers do not all have the same fixed time like a golf car has to last for a game or two whatever it is those guys use to decide.

Battery life for us is more commonly measure in time, not usage. Kinda like tires.

Suspect cars are fitted with an EXPENSIVE recording kWh meter he car's batteries are equalized, fitted with the inductive device, positive and negative connected, padlock is double-checked and off it goes.

I had T125's on my TT for ten years when I sold it this past spring and they were still going strong. Partly due to adding a charge wizard to intellipower converter which changes it from a dumb to smart charger. Also making certain that the fluid level was up and also not discharging them past 50%. So when we bought another TT it was a no brainier to get another pair of T125's.