Quick Battery Q

Deeds88

I have recently bought a volt meter to monitor the life of my batteries. They are at least 4yrs old and I would like some time to set back a little cash each month for when I do have to purchase new ones.

I am referencing the "State of Charge...." table that has been generously supllied by members. Last night I labled my batteries after approx 6hrs off the charger (Quick-Charge OBC) These are the readings I got, begining with the Pos side as 1 and 8 being the neg. This is a 48v system with ( 8 ) 6v Fullriver DC250-6 (250Ah)

(1) 6.54v
(2) 6.56v
(3) 6.53v
(4) 6.38v
(5) 6.38v
(6) 6.52v
(7) 6.55v
( 8 ) 6.56v

These all seem to be higher than the table reflects. Am I not letting it rest long enough after the charging process? Do these numbers look good to go? Any concerns with the 2 middle batts (6.38v). Should these be moved to other slots? Maybe switched with the higher v batts (2 & 8 )?

Many Thanks

BGW

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arcedout

Hopfully someone will chime in on this I also was in the upper range and this week my batterys are starting to drop down in the low 6.40's after 12 hrs of rest and a couple will stay around 6.48

scotter

I always rotated in pairs every six months. More often if I started seeing some imbalance going on. Where are the 2 extra six volts mounted - bagwell? What number are these?

jakesnake27

Wait 12 hours before you check the readings. This will give you an accurate voltage measurement.
Do you have any accessories that run off of only two of the batts?

Deeds88

temppics.jpg

Jake, good point regarding the accessories, there is a red wire on #4 and a black wire on #5 (these are the two weaker batts). Have not traced them to the acc. yet.

Scooter, #4 & #5 are in the same compartment, but "scooted" back a little and harder to reach (See pic)

I took readings again last night. These numbers are after 36hrs from last charge and 3 or 4 miles of riding in fairly hilly but not rough terrain.

1)6.46v
2)6.47v
3)6.45v
4)6.30v
5)6.31v
6)6.43v
7)6.46v
8 )6.47

Can you goin into further detail of rotating in pairs?
Many Thanks

shaffer88

Switch accessory wires to 6&7 then wait one month switch to 8&1 then wait one month switch to 2&3 then back to 4&5 this will help keep even strength over the entire pack. ,

Deeds88

Thanks Shaffer, that sounds much easier than moving the batts around. It would be a good time to trace those wires and determine which acc they power.

Waverider969

Did you have to make a bracket if some kind to fit those extra two batteries ?i wouldn't mind doing same thing with my extra two when I go 48v. Seems cleaner then having them in bag well.

arcedout

Here's how I fit mine in, I bolted aluminum angle to the frame and trimmed some of the body for easier acsess

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arcedout

Don't know why but its only letting me upload 1 pic at a time

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