48 V Lithium-Ion Battery Discharge During Use

[Duke878]

Heya folks!

Ive got a 48V Li-Ion battery that I'm using in my EKart. I've got a battery monitor that reads percentage and voltage hooked up.

While I'm riding around, the reading obviously dips down due to discharging...especially at the peak point. BUT it drops down to ZERO momentarily... Ive got a chart about safe percentages to avoid discharging too much... but what is the accurate reading? When I stop, the voltage goes back up to reasonable levels... is THAT the voltage I need to consider? How LONG can I ride around at peak discharge?

Thanks!

 

[Functional Artist]

Howdy &

It sounds like what your describing is "Voltage drop"
...& the VD is kind of an indicator of how "hard" the battery pack is being stressed.

What size motor do you have?
...& what is the Amp Hour rating of your 48V battery pack?

 

[Duke878]

Howdy &

It sounds like what your describing is "Voltage drop"
...& the VD is kind of an indicator of how "hard" the battery pack is being stressed.

What size motor do you have?
...& what is the Amp Hour rating of your 48V battery pack?

20Ah battery on a 1800W motor...

 

[Rat]

20Ah battery on a 1800W motor...

Too much motor for that battery, or not enough battery for that motor. Either way you should run 2 of those in series (doubles the ah) and you won't have to worry about it as much. That motor at full tilt peak output is demanding more current than the battery can keep up with... which is reflected in the meter reading nothing just as headlights going out or dimming severely while cranking the starter in any motor vehicle. All power tends to be diverted to the biggest demand at any given moment

 

[Duke878]

Too much motor for that battery, or not enough battery for that motor. Either way you should run 2 of those in series (doubles the ah) and you won't have to worry about it as much. That motor at full tilt peak output is demanding more current than the battery can keep up with... which is reflected in the meter reading nothing just as headlights going out or dimming severely while cranking the starter in any motor vehicle. All power tends to be diverted to the biggest demand at any given moment

Would this be batteries is parallel to get double the amperage and the same voltage?

If they're in parallel, can I charge them together using only one charge port or do they need to be charged individually?

 

[Rat]

Would this be batteries is parallel to get double the amperage and the same voltage?

If they're in parallel, can I charge them together using only one charge port or do they need to be charged individually?

Yes, I mistakenly stated series when I meant parallel.

Yes, you can charge them as a single unit, but note that they will take longer to charge that way... although it would be faster than charging them one at a time off the same charger.

If they were connected in series to increase voltage you would need a higher enough output charger to match the new voltage or to charge them separately.

Batteries in Series vs Parallel: Which is Better?

Do you know the difference between batteries in series vs parallel? Find out how to connect batteries in series or parallel & discover which one's best for you!

lithiumhub.com