Pack Voltage

[mygrumpy001]

Hi All just made a battery pack 4x 11.1 volts wired series and parallel when i tested them it read just over 25v is that right or is their something wrong John

 

[Alan Quay]

Hi All just made a battery pack 4x 11.1 volts wired series and parallel when i tested them it read just over 25v is that right or is their something wrong John

Yes. If your packs are 3 x 3.7v (nominal 11.1v) then each pack will be 3 x 4.2v at full charge. Assuming you have wired 2s2p then you should expect 6 x 4.2v (25.2v) when fully charged.

 

[mygrumpy001]

Yes. If your packs are 3 x 3.7v (nominal 11.1v) then each pack will be 3 x 4.2v at full charge. Assuming you have wired 2s2p then you should expect 6 x 4.2v (25.2v) when fully charged.

Yes. If your packs are 3 x 3.7v (nominal 11.1v) then each pack will be 3 x 4.2v at full charge. Assuming you have wired 2s2p then you should expect 6 x 4.2v (25.2v) when fully charged.

Hi Alan thanks for the reply but I thought if you wire 4 11.1 in serial you get 44.4v the packs are 3s1p thanks for any reply

 

[flecc]

Hi Alan thanks for the reply but I thought if you wire 4 11.1 in serial you get 44.4v the packs are 3s1p thanks for any reply

There must be a mistake in the wiring, since you should indeed get 44.4 v nominal (actual 50.4, much higher when fully charged) from 4 of those packs in series.

Your first post is a bit confusing since you said you wired 4 packs in series and parallel, so that 4 x 2 layout will only give 22.2 v nominal (but actually 25.2 v fully charged).

4 packs can only give the sum of the combined 4 voltages when in series, parallel pairs in series will only give the sum of 2 packs voltage.
.

 

[Alan Quay]

Hi Alan thanks for the reply but I thought if you wire 4 11.1 in serial you get 44.4v the packs are 3s1p thanks for any reply

I think you need to post a diagram of how you have wired them. When you said 'series and parallel' I assumed you meant 2s2p, which would give you 22.2v

 

[mygrumpy001]

There must be a mistake in the wiring, since you should indeed get 44.4 v nominal (actual 50.4, much higher when fully charged) from 4 of those packs in series.

Your first post is a bit confusing since you said you wired 4 packs in series and parallel, so that 4 x 2 layout will only give 22.2 v nominal (but actually 25.2 v fully charged).

4 packs can only give the sum of the combined 4 voltages when in series, parallel pairs in series will only give the sum of 2 packs voltage.
.

Is 50.4v to much for a 36v controller

 

[flecc]

Is 50.4v to much for a 36v controller

Usually it's ok, since its capacitors are rated at least 50 volts and often more. Also that's only a quiescent 50.4 volts, under working load the voltage will be much lower.
.

 

[mygrumpy001]

I think you need to post a diagram of how you have wired them. When you said 'series and parallel' I assumed you meant 2s2p, which would give you 22.2v

R R
B TO R RR
B B
R B
R R
B TO R BB
B B
Will this do John

I think you need to post a diagram of how you have wired them. When you said 'series and parallel' I assumed you meant 2s2p, which would give you 22.2v

I think you need to post a diagram of how you have wired them. When you said 'series and parallel' I assumed you meant 2s2p, which would give you 22.2v[/QUOT

 

[Wander]

R R
B TO R RR
B B
R B
R R
B TO R BB
B B
Will this do John

Difficult to follow what you are doing.

Series means
(+Batt1-) to (+Batt2-) to (+Batt2-) to (+Batt4-) to
etc. etc.

 

[Alan Quay]

R R
B TO R RR
B B
R B
R R
B TO R BB
B B
Will this do John

If I'm reading this correctly what you have made is a bomb.

I urge you to post a diagram so that we can advise further.

 

[mygrumpy001]

Difficult to follow what you are doing.

Series means
(+Batt1-) to (+Batt2-) to (+Batt2-) to (+Batt4-) to
etc. etc.

 

[Alan Quay]

You have wired the packs as 2s2p (so the cells are now 6s2p), which is why you are getting 25.2v

If you want 44.4v you need to wire all of them in series.

 

[mygrumpy001]

You have wired the packs as 2s2p, which is why you are getting 25.2v

If you want 44.4v you need to wire all of them in series.

Hi Could you load a diagram Please

 

[Alan Quay]

Hi Could you load a diagram Please

Are you playing with LiPo's here? You need to be very careful.

I will upload a diagram in a minute....

 

[Alan Quay]

Hi Could you load a diagram Please

 

[mygrumpy001]

Thank you so how do I Parallel them from the series so I double v and ah

 

[mygrumpy001]

Are you playing with LiPo's here? You need to be very careful.

I will upload a diagram in a minute....

Hi not playing with liPo have been using them for years but never had to make up packs John

 

[Alan Quay]

Thank you so how do I Parallel them from the series so I double v and ah

You can't do that. The only functional combinations of your four packs are listed above.