Top Balancing woes.

DerpsyDoodler

Photon Sorcerer
Joined
Jan 10, 2021
Messages
1,635
Back in Parallel. Slowly creeping up the voltage. 8.2amps going in with a hobby charger.
what's the spec sheet say about charge completion? for lishen, (iirc) when current drops to 8 amps @ 3.65v the charge is complete.
 

LVLAaron

Solar Enthusiast
Joined
Jul 16, 2021
Messages
166
what's the spec sheet say about charge completion? for lishen, (iirc) when current drops to 8 amps @ 3.65v the charge is complete.
NOMINAL VOLTAGE: 3.2V
CAPACITY: 100ah (105ah+ is being reported by customers)
WATT HOURS: 320
FULLY CHARGED VOLTAGE: 3.65V
FULLY DISCHARGED VOLTAGE: 2.5V
MAX CONTINUOUS CHARGE: 100A (1C)
MAX CONTINUOUS DISCHARGE: 100A (1C)
MAX PULSE DISCHARGE (10 SECONDS): 200A (2C)
MODULE WEIGHT: 6.5 lbs
MODULE DIMENSION: 7" X 5.5" X 3"

I'm @ 8 amps charging around 3.36 volts. It's only a 10amp charger, so it's just a limitation of the small turnigy
 

DerpsyDoodler

Photon Sorcerer
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Jan 10, 2021
Messages
1,635
i was able to pump ~9.75a in with my little 10a supply. I used thick (10 awg) wire with ring terminals for connection both to supply and battery. You can probably forgo the overkill 10awg but ring terminals are almost necessary.
 

LVLAaron

Solar Enthusiast
Joined
Jul 16, 2021
Messages
166
i was able to pump ~9.75a in with my little 10a supply. I used thick (10 awg) wire with ring terminals for connection both to supply and battery. You can probably forgo the overkill 10awg but ring terminals are almost necessary.

I built a new charge lead with some ring terms on it and the charger immediately started pushing 10 amps instead of 8.2.

Nice. Didn't think it would make much difference at this low voltage.
 

DerpsyDoodler

Photon Sorcerer
Joined
Jan 10, 2021
Messages
1,635
I built a new charge lead with some ring terms on it and the charger immediately started pushing 10 amps instead of 8.2.

Nice. Didn't think it would make much difference at this low voltage.

i think lower voltages will acually make it more apparent, though let an EE confirm or deny that.
 

LVLAaron

Solar Enthusiast
Joined
Jul 16, 2021
Messages
166
You get a few more style points and maybe some level-of-difficulty points if you charge your AGM with solar.

... hmmm, maybe watching too much Olympics?

Heh, No solar easily accessible from the shop I'm working out of.
 

DerpsyDoodler

Photon Sorcerer
Joined
Jan 10, 2021
Messages
1,635
You get a few more style points and maybe some level-of-difficulty points if you charge your AGM with solar.

... hmmm, maybe watching too much Olympics?
How's solar charging agm any more difficult than lifepo4? let alone top balance charging diy cells? ;p
 

LVLAaron

Solar Enthusiast
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Jul 16, 2021
Messages
166
Ha. We'll see what I can fit on the roof of the camper. It's a curved top so I might have to go with two flex panels
 

MisterSandals

Participation Medalist
Joined
Nov 5, 2019
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4,788
Location
Silicon Valley
It's a curved top so I might have to go with two flex panels
How curved? What's your rig? I'd bet someone hear has done it...
I cannot say I would recommend flex panels. They don't have a good record for reliability or production. And there are quite a few issues with mounting them that deals with heat and wind.
 
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