# Battery upgrade...what size?

msgieser
Registered Users Posts:

**24**✭✭
In upgrading my batteries I'm looking at two options. Any comments are appreciated!

1. Trojan T105RE's. These 6 volt batteries are 225 amp and cost about $175 each. In my 12 volts system, 8 of them would give me 900 amps and cost $1400.00

2. Trojan L16RE's. These 6 volt batteries are 370 amp and cost $350 each. In my 12 volt system 4 of them would give me 740 amps and cost $1400.00

The big question I have is which is best? Option #2, with the L16's would give me 160 less amps for the same price. But what am I missing? I realize the L16's are a lot bigger/stronger but does anyone know if they have better "amp utilization"? What about recovery? I have experience with the T105's but know nothing about the L16's. Is it worth the loss of 160 amps if going to the larger battery? HELP?

1. Trojan T105RE's. These 6 volt batteries are 225 amp and cost about $175 each. In my 12 volts system, 8 of them would give me 900 amps and cost $1400.00

2. Trojan L16RE's. These 6 volt batteries are 370 amp and cost $350 each. In my 12 volt system 4 of them would give me 740 amps and cost $1400.00

The big question I have is which is best? Option #2, with the L16's would give me 160 less amps for the same price. But what am I missing? I realize the L16's are a lot bigger/stronger but does anyone know if they have better "amp utilization"? What about recovery? I have experience with the T105's but know nothing about the L16's. Is it worth the loss of 160 amps if going to the larger battery? HELP?

## Comments

416✭✭✭They are running 24 volt sys.

One guy has 4 six volts for frig and 8 6 volts for house hold stuff with different inverters and different chargers .

The other guy used 8 gc230s 1 8 battery 6 volt at 24 volts for every thing only has 1000 watts of solar and runs a genarator for a hrs or so every day . His battery's are 8 years old but need to be changed now.

Seems good to me , really don't think you need to spend a lot of money on battery's SAMs gas are 89 bucks each .

3,738✭✭✭✭More important though is the number of parallel strings of batteries. The smaller batteries require 4 parallel strings to get the capacity you need. The L-16 would have only two parallel strings. The fewer the better.

Why not buy six 2-volt batteries and have just a single string?

--vtMaps

29,747adminAre you still committed to the 12 volt battery bank? ~800 AH is about the largest AH battery bank I would suggest before going up to the next voltage (12 to 24 to 48 volt bank).

Also, I am not a fan of paralleling battery strings if it can be avoided. 1x (for me) is ideal. 3x parallel strings is about the maximum I would suggest unless you have no other choice.

You have been using battery systems for quite awhile now--Are you getting tired of checking water levels and battery connections? Have you had any issues with debugging parallel batteries, slow failures (one cell battery fails, then a few months later, a second fails, etc.).

If you look for 2 volt cells, be a bit careful. At least one of the Trojans is actually just a 3 cell battery with the cells wired in parallel instead of series (still three cells to check/water/etc.).

-Bill

3,738✭✭✭✭--vtMaps

80✭✭766✭✭✭✭Solar hybrid gasoline generator, 7kw gas, 180 watts of solar, Morningstar 15 amp MPPT, group 31 AGM, 900 watt kisae inverter.

Solar roof top GMC suburban, a normal 3/4 ton suburban with 180 watts of panels on the roof and 10 amp genasun MPPT, 2000w samlex pure sine wave inverter, 12v gast and ARB air compressors.

878✭✭✭✭While keeping the number of strings as low as possible - and still getting decent batteries.