Ebike controller

[chris_n]

Should be using the same capacity blocks when connecting in series or parallel.

Really, please do explain why.
Series I can understand but when paralleled it makes no difference what the capacity is as the load just sees it as 1 source. Of course the voltages need to be matched before connection.

 

[Doobz]

I (for a moment at least) was thinking the effective capacity was reduced in parallel as well as series - doh. I guess it's ok to use dissimilar capacity cells in parallel (as long as volts are matched before connecting).

 

[harrys]

I occasionally put packs with different capacities in series, knowing that range will be determined by the smaller AH pack. No worries for unbalance as they get re-charged separately. This for 12V and 36V packs to get 48V.

 

[Parsons]

Yes that's what i do connect up in parallel and then into series . but I charge the battery separate looking to buy two more 10000 ah but out of stock in Hobbyking

 

[Doobz]

I occasionally put packs with different capacities in series, knowing that range will be determined by the smaller AH pack. No worries for unbalance as they get re-charged separately. This for 12V and 36V packs to get 48V.

Ha, so do I. Decided to get a booster battery to go from 12s to 15s - 12s is 10ah, 3s is 6.6ah. Works well, low voltage alarm on the smaller pack if necessary. Only downside is charge time. Smaller capacity and only 3s means nearly three times less W/h going into it. Splitting the pack is becoming a chore.

Back to topic, if identical hub motor can take 1KW continuous, then why not get a controller capable of putting more through it.