The Trojan T 145's are 10 lbs heavier, then the T105's they are the same dimensions except for height. The height is measured from the bottom of the bat case to the top of the terminal stud.
But this is not always the measure of the actual plate heights, as noted the 145's are 10lbs by weight more mass in plates, but only less then 1 inch taller. So that means the well at the bottom of the plates on the 145s is less the that the 105's.
The 145's are 260 amp hr, and the 105's are 225 amp hr, both at the 20 hr rate. The 520 you quote is the reserve minutes of the 145's at 25 amp load, the 105's are 447 reserve minutes, at the rated 25 amp load.
T-145 10.30 X 7.11 X 11.90 X 72 lbs
T-105 10.30 X 7.11 X 11.07 X 62 lbs
The 145's are built with more plates, thinner then the 125's that are less plate, but thicker.
The 145's have the lowest internal resistance(pukert factor) of all the Trojans. Trace Engineering did a study of the same some 25 years ago, and the 145's had a Pukert factor of 110-115, the 105's a 125, and the L-16's a 1.30.
So in the end it depends on what the design system is. Operating in a low Pukert load in partial SOC, the 105's are a good fit. Operating high Pukert...ie inverter
loads the 145's are a better fit. But the are both dependent on not going below 50% SOC
The Cycle Life is dependent on the charge regime, charge early, and charge fully. And both batteries do better with a bulk charge of 14.8, reduced to 14.6 volts upon reaching absorption voltage.
Operating in a partial state of full charge, results in more plate shedding, which favors the 125's, because they have deeper wells.
Originally Posted by Onemoreproject
I am evaluating the merits of different batteries for a long distance off-grid cruising. Batteries will rarely reach 100% because it takes much longer for the batteries to accept the last 10% of charge. I am wondering if its a good trade
off to buy the 250 AH Trojan 105 RE batteries because they have 25% more life cyles then the T145s? The T105s would give me a 450 AH house bank as opposed to 520AH from the T145s.
Another consideration is that a bigger bank will need more energy to charge them. I only have 360 watts of solar panels
so the rest of the charge will have to come from the engine
or I may get a wind generator
A tech at Trpojan told me that I should have 1.5 watts of solar for every AH in my batteries. Not likely to find room for that much solar on a 36.5' boat.
I read Maine Sails
artricle on 6v flooded and really appreciate his insights. He saved me from getting AGM
Group 31 batteries when I had room for GC2 Trojans. On my last boat I had Trojan 6v, but only used the boat for racing
and weekend trips. They never let me down.
Any opinions would be mos welcome! Big shout out to Maine Sail!!