ngant17
1 W
My original problem with my e-bike was with a fully-charged Greenworks 60v battery It will have +62v after charging, which is enough over-voltage to shut down the stock Bafang C961 display computer that controls the 48v BBS02 motor. Fortunately Bafang has built in over-voltage protection but I want to keep voltages at safe levels.
I recently added an Echo 58v battery and a marine dual battery switch into the mix. However I’ve been advised that combining batteries in parallel is acceptable if you prevent connecting into battery packs of significantly differing voltage. To address that issue, the marine dual battery switch allows for Battery 1 (Echo 58v), Battery 2(Greenworks 60v), Battery1/2 (parallel operation), and Off. I’m assuming 58v and 60v are not “significantly different”.
https://knightsucfedu39751-my.share...dAniKhePIUxakBMc_gnut2fJ8bLbs9S7482A?e=wX0ryc
When I switch to run in parallel, Battery 1/2 , my VOM shows 59v as it combines Echo 58 volts and Greenworks 60 volts in parallel. I’m thinking that if I run these two slightly-dissimilar batteries in parallel for a short time, the Greenworks voltage will drop down enough to the point where I can just switch over to Battery 2 operation only. That won’t cause any over-voltages into the Bafang C961 display unit.
Based on previous threads in the forum, Echo 58v 4ah batteries are: 14s2p 18650s
The Greenworks 60v 4 ah battery is Panasonic in a 6x5 array of cells. So I’m assuming it is 15s 2p (2 parallel blocks of 15 cells in series.). Numbers/letters stamped on internal cells is: Panasonic UIG95GD cells.
Would it damage batteries when using them in parallel for short periods of time? My only other option is to use a buck converter to keep Greenworks 60v down to a manageable level that will run the Bafang motor.
Greenworks and Echo batteries are the cheap way for me to power my e-bike but I need a 8ah pack to go any distance with pedal assist. So two 4ah packs seem to be a solution for me.
I recently added an Echo 58v battery and a marine dual battery switch into the mix. However I’ve been advised that combining batteries in parallel is acceptable if you prevent connecting into battery packs of significantly differing voltage. To address that issue, the marine dual battery switch allows for Battery 1 (Echo 58v), Battery 2(Greenworks 60v), Battery1/2 (parallel operation), and Off. I’m assuming 58v and 60v are not “significantly different”.
https://knightsucfedu39751-my.share...dAniKhePIUxakBMc_gnut2fJ8bLbs9S7482A?e=wX0ryc
When I switch to run in parallel, Battery 1/2 , my VOM shows 59v as it combines Echo 58 volts and Greenworks 60 volts in parallel. I’m thinking that if I run these two slightly-dissimilar batteries in parallel for a short time, the Greenworks voltage will drop down enough to the point where I can just switch over to Battery 2 operation only. That won’t cause any over-voltages into the Bafang C961 display unit.
Based on previous threads in the forum, Echo 58v 4ah batteries are: 14s2p 18650s
The Greenworks 60v 4 ah battery is Panasonic in a 6x5 array of cells. So I’m assuming it is 15s 2p (2 parallel blocks of 15 cells in series.). Numbers/letters stamped on internal cells is: Panasonic UIG95GD cells.
Would it damage batteries when using them in parallel for short periods of time? My only other option is to use a buck converter to keep Greenworks 60v down to a manageable level that will run the Bafang motor.
Greenworks and Echo batteries are the cheap way for me to power my e-bike but I need a 8ah pack to go any distance with pedal assist. So two 4ah packs seem to be a solution for me.