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Old 03-06-2014, 04:13 PM   #1
LSU_TXT
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Default 48v Conversion Best Battery Configuration?

Hey all. New here and neck deep in a complete frame up rebuild on a 99 TXT for hunting. Found one with bad batteries and no charger so great/cheap way to start the build in the right direction. Just got in all my goodies from Scotty and need to go get my batteries tomorrow if possible. I feel like I'm hittin' my nuts with a rubber mallet trying to decide on 8-6v or 6-8v. I have talked with my local Battery Wholesaler and need to run over there as soon as I can decide the best route to go and since this is one of the biggest costs/investments in the cart I want to make the right choice for my application and environment. I am getting either T145 6v or T875 8v. I know there are other battery choices but I am set on one of these two routes after all my discussions. So here is the breakdown as I see it. I know I will get more run time out of 8 T145's but at what real advantage when the big picture is considered? Going with T145's will add 200lbs more to the cart over 6 T875's. T145's will also cost me $500 more for the set of 8. That is almost double the price of what I can get 6 T875's. I will have a charger on hand to plug in every night when at the camp for the weekend. I have a 48-12v converter for LED lights and occasional radio use. I have a 12v dedicated battery for the winch. I got a 650 SPM controller and F&R solenoid switch kit from Scotty so I can mount all 8 T145's under the seat just need to move the 12v somewhere else or if going with 6 T875's the 12v can go under seat as well. I have the stock Series TXT motor but may upgrade to a D&D Hi Torque down the road but hell for the $500 less in battery cost if I go with T875's I could go ahead and get the motor upgrade now if that is the best choice in the end. These batteries last a long time and are a big expense so that is why I am so torn on which is the best route.

I will use my cart in pretty hilly country. For example, at our place 36v carts need to be pulled up or winched occasionally on a few of the hills when loaded down. Some fairly steep but not very long. Would be pretty commonly carrying 600-800lbs between people and feed on the cart. Some towing of a small feed cart. Property is 300 acres with a lot of trails so we do a bit of riding some days. 36v carts with Pacer 6v 105min 75amp batteries running there have never run out of juice in a single days riding and are usually charged at night as well. Hopefully some of this helps with explaining the environment we ride in.
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Old 03-06-2014, 04:41 PM   #2
cgtech
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Default Re: 48v Conversion Best Battery Configuration?

A major advantage you have not covered when considering 8-6v batts is that a pack of batteries drained only to 60% every time it is used will give more charge/discharge cycles before needing replaced than a pack that that is drained to 40% every time it is used. The less it is discharged every time it is used will extend the lifespan of the batteries. Going with the highest AH rated batteries is the best investment, as it will be less depleted after a days use.
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Old 03-06-2014, 04:44 PM   #3
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Default Re: 48v Conversion Best Battery Configuration?

to me its a toss up if cash was no object then I would lean towards 8-6 volts. but in the normal world 6-8's should handle what your doing. I have 6-8's, 700amp GE with a PQ motor pushing 25 miles (some flat, some hill, some speed) everyday and don't seem to be short on battery life. The key to battery life is maintaining them right, checking water levels and filling as needed. As long as you can do this fairly easily with 8-6's then thats fine but if its going to be a hassle to this then thats something to consider.
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Old 03-06-2014, 05:05 PM   #4
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Default Re: 48v Conversion Best Battery Configuration?

Quote:
Originally Posted by cgtech View Post
A major advantage you have not covered when considering 8-6v batts is that a pack of batteries drained only to 60% every time it is used will give more charge/discharge cycles before needing replaced than a pack that that is drained to 40% every time it is used. The less it is discharged every time it is used will extend the lifespan of the batteries. Going with the highest AH rated batteries is the best investment, as it will be less depleted after a days use.
Good point but it's almost half the cost to replace all the batteries. The T145's aren't going to last twice as long as the T875's. Our local battery wholesale company which only deals in batteries and does a lot of business with the carting industry here all say these are both proven batteries and should have a comparable life span, not the same but comparable. Here is the breakdown on the batteries.

6 - T875 8v $654 378 lbs
8 - T145 6v $1135 576 lbs

Problem here is I can't after the fact just say **** this is not enough juice let me add two more batteries. This decision has to be made up front or buy a whole new set of batteries and I have no personal experience with these setups where I ride.......
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Old 03-06-2014, 05:09 PM   #5
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Default Re: 48v Conversion Best Battery Configuration?

Quote:
Originally Posted by Swan View Post
to me its a toss up if cash was no object then I would lean towards 8-6 volts. but in the normal world 6-8's should handle what your doing. I have 6-8's, 700amp GE with a PQ motor pushing 25 miles (some flat, some hill, some speed) everyday and don't seem to be short on battery life. The key to battery life is maintaining them right, checking water levels and filling as needed. As long as you can do this fairly easily with 8-6's then thats fine but if its going to be a hassle to this then thats something to consider.
I am pretty good with checking and maintaining things so I will keep an eye on water levels. I can fit the 8 -6v's under the seat just have to find a place for the 12v. Not a big problem but this is 200 lb's more weight so more like always riding around with 800-1000 lbs on the cart and $500 more dollars. Don't mind if it is something I need to do.
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Old 03-06-2014, 05:11 PM   #6
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Default Re: 48v Conversion Best Battery Configuration?

Is there any reason one setup would be better or worse once I do go with a Hi Torque D&D? I'm new to all this sparky stuff. Just an old gas and turbo guy. I'm learning though.
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Old 03-06-2014, 05:42 PM   #7
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Default Re: 48v Conversion Best Battery Configuration?

Let me toss you a curve ball, while doing some number crunching on your other questions.

Did you ever consider going with seven 6V batteries for 42V?
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Old 03-06-2014, 05:45 PM   #8
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Default Re: 48v Conversion Best Battery Configuration?

It depends on your uphill, weight, and total drive time. It all depends on how many amp-hours you need, vs. total 48 volts amp-hours. Dollars also come into play.

Prolly not much help.
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Old 03-06-2014, 06:22 PM   #9
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Default Re: 48v Conversion Best Battery Configuration?

A 6 X T-875 48V pack has approximately the same run time as a standard 36V pack (6 x T-105 - 225AH) and the 8 x T-145 48V pack will give you slightly over 50% more run-time than the standard 36V pack. (See first attached chart)

Under ideal conditions and a conscientious maintenance program, if your daily usage would take the T-875 (170AH - 48V) pack down to 50% SoC, the same usage would only take the T-145 (260AH - 48V) pack down to 67.3% SoC, so the projected lifespan of the T-875 pack is 42 months and the projected lifespan of the T-145 pack is 63 months. (See second attached chart)

Applying those projected lifespans with the costs stated, the T-875 pack will cost $15.47/month while the T-145 pack will cost $18.03, or about $0.09 more per day.
Attached Images
File Type: jpg 48V kWh Comparisons.JPG (105.4 KB, 0 views)
File Type: jpg SoC vs Theoretical Charge cycles with Voltages-2.JPG (114.0 KB, 0 views)
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Old 03-06-2014, 06:33 PM   #10
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Default Re: 48v Conversion Best Battery Configuration?

Another alternative is the Trojan Ranger-160 8V battery.

About the same size as the T-875, but about 15 pounds per battery heavier and has 204AH rather that 170AH.

Under the same conditions, it would last about 50 months and if the cost was less than 20% higher than the T-875, it would be a better bang for the buck.
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