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  #11  
Old 02-17-2009
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IIRC, the Trojan T125 has more capacity than the T105, and the T105s are rated at 225 amp-hours, so six of them would be 675 amp hours, not 375... and the T125s would be a bit more, probably 725 or so.

Quote:
Originally Posted by Vasco View Post
Am i missing something, 6 trojan 6v 125's is only 375 amp hours @12v
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  #12  
Old 02-17-2009
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Looks like I'll be going Mastervolt... they make slimline AGMs (not the new TPPL technology) that are 200AH each. I can fit 4 in our current box for a total of 800AH. I'll also be replacing our current Freedom 15 charger/inverter (75AH charger) with a Freedom 30 (up to 140AH charger) or a Freedom 25 (up to 130AH charger). I'll have to play with the charging amperage to make sure I don't overload anything, but I'll have a little more charge capacity, and the footprint is the exact same (although I'll be upgrading some of my battery cabling).
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Old 02-18-2009
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Just curious, how much are the Mastervolt AGMs??
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  #14  
Old 02-18-2009
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Ridiculously expensive. It looks like I'll be able to get them for about $550 each, but I really want the extra amp hours and not have to expand our battery box. It's that important.
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  #15  
Old 02-18-2009
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Quote:
Originally Posted by labatt View Post
Looks like I'll be going Mastervolt... they make slimline AGMs (not the new TPPL technology) that are 200AH each. I can fit 4 in our current box for a total of 800AH. I'll also be replacing our current Freedom 15 charger/inverter (75AH charger) with a Freedom 30 (up to 140AH charger) or a Freedom 25 (up to 130AH charger). I'll have to play with the charging amperage to make sure I don't overload anything, but I'll have a little more charge capacity, and the footprint is the exact same (although I'll be upgrading some of my battery cabling).
Check these batteries also, you should be able to fit in 3 or 4 of the 210's.
Meridian AGM

Paul L
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Old 02-18-2009
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Not what you originally posted, but what about putting another battery somewhere else and connecting it in.

Trying to think outside the (battery) box.
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  #17  
Old 02-19-2009
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Using individual 2v cells and bolting them up is in fact the worldwide standard for the batteries used in electric fork lifts and other industrial applications. It is the only way to assemble a huge battery and still have a way for one or two men to lift the pieces by hand, and it is a proven economy since individual cells can be (and are) replaced if one cell fails.
When you think about it, it has the same number of failure points as any 12v battery which has been assembled--and then sealed out of reach in a case. But, with individual cells you can at least access the connections.

Of course, you can't ust hop down to the local chandlery to buy the cells, or get warranty service on them. But there's a fork lift battery supplier in just about every commercial port in the world.
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Old 02-19-2009
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Quote:
Originally Posted by Vasco View Post
Am i missing something, 6 trojan 6v 125's is only 375 amp hours @12v
Two T-125''s wired in series for 12V will supply 240amp hours @ the 20 hour rate. Six of these wired in series/parallel gives you 720 amp hours..

In series = Double voltage / amps stay the same

In parallel = Double amps / volts stay the same
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  #19  
Old 02-19-2009
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Quote:
Originally Posted by labatt View Post
Ridiculously expensive. It looks like I'll be able to get them for about $550 each, but I really want the extra amp hours and not have to expand our battery box. It's that important.
Labatt,

I am looking at these batteries as well but they seem to be hard to find.

May I ask where (retailer) you are going to buy them?

MaineSail,

Should that be:

Wired in series = double voltage, half the amp?

Cheers
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Quote:
Originally Posted by jorgenl View Post

MaineSail,

Should that be:

Wired in series = double voltage, half the amp?

Cheers
If we are talking about the face value ratings of just one battery no, if you are talking about two batteries yes.. I was referring to the face value ratings of one 6V battery.

When you wire two of them in series, and use the face value ratings of one six volt battery, the voltage goes from 6 to 12 but the amp hour rating stays the same.

If using two batteries for your basis the voltage doubles in series from 6 to 12 and the amp hours are cut in half..

Apples & oranges both are correct.
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