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Discharging a 52 volt battery pack

Posted: Mar 05 2019 5:02pm
by Talon
I have a brand new Luna 52 volt 13.5ah battery pack that I need to discharge down to about 45 volts for storage. The pack won't be used for another month or so until it temperatures warm up in the Spring time. I have a Luna mini charger that I used to charge the pack to 90% 4 weeks ago. I read and learned a lot about storing batteries since that time. My question is.... Can I just hook up the discharging battery terminals to a desk lamp with an 110 volt incandescent bulb as the load to safety discharge my pack down to a lower voltage for more storage? I did a search here and didn't find the answer that I was looking for. Thanks!

Re: Discharging a 52 volt battery pack

Posted: Mar 05 2019 5:45pm
by mark5
Re: my discharger DIY by psycholist
http://endless-sphere.com/forums/viewto ... 37#p489415
psycholist wrote:Easy lipo discharger:

Purchase a normal household 110v outlet.
Connect wattmeter between battery and screw terminals on outlet.
Plug power strip bar (4-6 outlets) into outlet.
Plug resistive load appliances (iron, quartz heater, griddle, frypan, floodlights etc.) into power strip.
Switch on appropriate # and combinations of appliances for desired amperage.

Use cellogs, battery medic, icharger (monitor mode) etc. for monitoring.
Re: Discharging LIPO help by Paladin
https://endless-sphere.com/forums/viewt ... 82#p993640

LBD by Ypedal
http://ypedal.com/Lbd.htm

Lightbulb Discharger by xenodius
https://endless-sphere.com/forums/viewt ... 14&t=53903

Joined the light bulb club today. by StudEBiker
https://endless-sphere.com/forums/viewt ... =3&t=18797

Re: Discharging a 52 volt battery pack

Posted: Mar 05 2019 5:54pm
by spinningmagnets
An incandescent filament bulb will work. 40W is better than 100W, but either will work.

I recommend that you don't allow the pack to go below 3.3V per cell. 14S X 3.3V = 46V

Re: Discharging a 52 volt battery pack

Posted: Mar 05 2019 8:40pm
by markz
spinningmagnets wrote:
Mar 05 2019 5:54pm
An incandescent filament bulb will work. 40W is better than 100W, but either will work.

I recommend that you don't allow the pack to go below 3.3V per cell. 14S X 3.3V = 46V
3.30V is a good minimum to have, or 3.20V.

I store mine at 3.60-3.70V overnight, but havent needed to store a long time as I ride everyday.

Re: Discharging a 52 volt battery pack

Posted: Mar 05 2019 8:45pm
by kcuf
no 45v storage

bms drains 24 7

52v 53v enough benefit

discharge using incandescent lamp or heater element

100% charge allow time for cell balance before discharge

Re: Discharging a 52 volt battery pack

Posted: Mar 05 2019 10:33pm
by Matador
I did dicharge my 10S ebike pack, my other 14S ebike pack and my 10S eskate pack.

For storage, I prefer to stay at 30-35% state of charge which is 3.63V per cells. Dont forget BMS sometimes drain parasitic current.

Discharge your 14S battery to a resting voltage of 50.8V. Buy for long term, anywhere from 50.8V 35% to 52.0V (50%).

I monitor voltage every 2-3 weeks for all my batteries. In 4 months tey did not move a single volt decimal after 4 months.

Re: Discharging a 52 volt battery pack

Posted: Mar 05 2019 10:37pm
by Matador
Dont go 45 or even 46 V. It,s too low. For storage, going below 3.5V is wherr you start ti be in a region of the discharge curve that rapidly drops. Not 3.4 or 3.3V, it onky takes a few tens of milliamps capacity draining and you can goa bellow 3.0V, where cells tan start to become damage

Re: Discharging a 52 volt battery pack

Posted: Mar 05 2019 10:39pm
by Matador
An incendescent bulb will work... But it might be slow... Good if your pack is only good for low current. If you want to go faster, use a hait dryer instead of a light bult...

How i did it and how fast: https://endless-sphere.com/forums/viewt ... 5#p1429947