smeagol222
100 W
I finished my modular battery version 1.0! I messed up by charging 4 of the 18650 cells then proceeded to put them all together. I noticed weird balancing differences within the pack. So I dismantled each stack and found the 3.5v cells (others were 4.2v). I charged them up to match the other voltages. +1 for modular battery! Imagine if I had spot welded, heat shrink etc. I would never have known and the pack would be more and more damaged over time.
The CellLogs are under the plexiglass, perhaps for version 1.1 I'll figure a way to stick them to the underside of the plexiglass and have them all facing the same way to make them easier to read. Also regarding water I think making a cover that fits over the top and cut some drain holes in the bottom of the battery box- although there were no holes when the SLA batteries were in there. Perhaps the seat cover protects agains the rain for the most part. I don't plan to ride in torrential rain.
Anyways each 5S stack has a switch to turn on and off the CellLog. Each stack has main discharge XT150 terminals, XT60 for charging, JST 5S for balancing and 2 female bullets for CellLog output alarm which I'm going to wire red lights up to the front dash on the bike.
Currently I have each alarm set to go off for the below. Is 3.0v a good alarm voltage? Or should it be more like 3.3-3.4v? Obviously I don't want to overdischarge and damage my cells, and if I plan on a big trip I would definitely bring a secondary battery to switch to.
4.22v - over voltage
3.0v - under voltage
100mV - cell difference
Apart from my 72v lifepo4, I have a bunch of 48v batteries which I could use as emergency (have an Anderson connecter wired into the trunk box) obviously I wouldn't have the same performance, but at least I'd be able to make it home (or part of the way).
I put a little handle in the middle, though the holes aren't ideal, seems very sturdy with 4 bolts and able to take the weight
Here is how it fits in the battery box. After I cut the bar I'll have room for the secondary lifepo4 battery. Going to add some padding inside the box also.
The CellLogs are under the plexiglass, perhaps for version 1.1 I'll figure a way to stick them to the underside of the plexiglass and have them all facing the same way to make them easier to read. Also regarding water I think making a cover that fits over the top and cut some drain holes in the bottom of the battery box- although there were no holes when the SLA batteries were in there. Perhaps the seat cover protects agains the rain for the most part. I don't plan to ride in torrential rain.
Anyways each 5S stack has a switch to turn on and off the CellLog. Each stack has main discharge XT150 terminals, XT60 for charging, JST 5S for balancing and 2 female bullets for CellLog output alarm which I'm going to wire red lights up to the front dash on the bike.
Currently I have each alarm set to go off for the below. Is 3.0v a good alarm voltage? Or should it be more like 3.3-3.4v? Obviously I don't want to overdischarge and damage my cells, and if I plan on a big trip I would definitely bring a secondary battery to switch to.
4.22v - over voltage
3.0v - under voltage
100mV - cell difference
Apart from my 72v lifepo4, I have a bunch of 48v batteries which I could use as emergency (have an Anderson connecter wired into the trunk box) obviously I wouldn't have the same performance, but at least I'd be able to make it home (or part of the way).
I put a little handle in the middle, though the holes aren't ideal, seems very sturdy with 4 bolts and able to take the weight
Here is how it fits in the battery box. After I cut the bar I'll have room for the secondary lifepo4 battery. Going to add some padding inside the box also.