Lipo Para wiring??

[Jeff Wohlt]

How many of you use smaller packs say 4S and 2600 - 20C (example) and para wire them to give you 5200 mah and 40C.

Seems like it would be cheaper and stronger?

Give me some input, please. Seems like a cheaper solution to more more power and cheap. Even 6S smaller packs are much cheaper.

[kookie_guy]

How many of you use smaller packs say 4S and 2600 - 20C (example) and para wire them to give you 5200 mah and 40C.

Seems like it would be cheaper and stronger?

Give me some input, please. Seems like a cheaper solution to more more power and cheap. Even 6S smaller packs are much cheaper.

Would you get 40C? I don't think the discharge rate doubles. Yes, you get double the capacity, but the individual cells can still only discharge at their limit, which would be 20C.

[Jeff Wohlt]

hmmm..not what I understand about C rating. But this is the reason for me asking.

[kookie_guy]

I could be wrong too. Any battery experts care to chime in?

[BondoBrushless]

Weither 2 packs are joined in series or parralle the C-rating stays the same.

Series is double volatge and same Mah

Parralle is double Mah and same voltage

In parralle the amp discharge does rise some due to mah capacity has risen, but not much at all with small packs.

[sailr]

Parallel doubles the mAh
Series doubles the Volts

NOTHING doubles the C rating

[m4a1usr]

NOTHING doubles the C rating

G-freak does! Hah,...gottcha there Jim

John

[sailr]

Well, G-freak seems to do a lot of things that are, uh.....

[chuff]

Parallel doubles the mAh
Series doubles the Volts

NOTHING doubles the C rating

I beg to differ... strictly your answer is correct, but may confuse some viewers.

The C rating of each pack does not change when wired in parallel (as you say, NOTHING can change the pack RATING), but the current draw out of each pack will halve.

A given motor/prop/hull combination will draw a certain current (amps) and power (watts). In a ?S1P setup ALL that current comes out of the 1P pack. That is, ALL the current passes through EVERY cell in the pack. However, in a ?S2P setup made of two ?S1P packs half that current comes out of EACH pack. Such ?S2P layouts therefore do two things: they double the mAhrs, and they HALVE the current draw or "stress" on each cell in the packs. Single ?S2P packs offer similar benefits.

Chris

[Fluid]

... strictly your answer is correct, but may confuse some viewers.

In reality with higher draw setups, paralleling packs does not halve the total draw. By reducing the internal resistance (going 2P) the packs can deliver a higher watt output; this is why you will see a speed increase in a hot setup when going from 1P to 2P.

But to return to the original post: a 4S1P/20C/2600 mAh pack has a "maximum" recommended discharge of 52 amps. A 4S2P/20C/2600 mAh pack has a "max" discharge of 104 amps.



.

[sailr]

So what are you 'differing' about!? Your explanation is also correct but a simple question was asked and a simple answer given. I chose not to explain how to build a watch when somebody asked what time it was!

I beg to differ... strictly your answer is correct, but may confuse some viewers.

The C rating of each pack does not change when wired in parallel (as you say, NOTHING can change the pack RATING), but the current draw out of each pack will halve.

A given motor/prop/hull combination will draw a certain current (amps) and power (watts). In a ?S1P setup ALL that current comes out of the 1P pack. That is, ALL the current passes through EVERY cell in the pack. However, in a ?S2P setup made of two ?S1P packs half that current comes out of EACH pack. Such ?S2P layouts therefore do two things: they double the mAhrs, and they HALVE the current draw or "stress" on each cell in the packs. Single ?S2P packs offer similar benefits.

Chris

[Jeff Wohlt]

Jay....bingo! That was the answer I was looking for. Amps being pulled. Maybe I did not state the question right. So I am right that I can use smaller packs and be able to pull more amps on 2P than 1P? Not that I will want to push them hard but 2P has the ability to let more juice flow if needed.

The reason is I would like to get a couple of 4S 2600 packs at 20 or 25c and be safe to pull 80 amps or so and still have a large "gas tank" if you will. These would be for my cats or smaller rigs.

[FighterCat57]

In reality with higher draw setups, paralleling packs does not halve the total draw. By reducing the internal resistance (going 2P) the packs can deliver a higher watt output; this is why you will see a speed increase in a hot setup when going from 1P to 2P.

But to return to the original post: a 4S1P/20C/2600 mAh pack has a "maximum" recommended discharge of 52 amps. A 4S2P/20C/2600 mAh pack has a "max" discharge of 104 amps.



.

So, it essentially doubles the available C Amps, but not the rating in type.

Perhaps a flaw in the rating setup? Or the opportunity for a new rating? Available C?

Or just a simple calculation we should extrapolate when we see the "2P"... we know to double the "C" for available amps...


I love coffee.

[FighterCat57]

Jay....bingo! That was the answer I was looking for. Amps being pulled. Maybe I did not state the question right. So I am right that I can use smaller packs and be able to pull more amps on 2P than 1P? Not that I will want to push them hard but 2P has the ability to let more juice flow if needed.

The reason is I would like to get a couple of 4S 2600 packs at 20 or 25c and be safe to pull 80 amps or so and still have a large "gas tank" if you will. These would be for my cats or smaller rigs.

Jeff, I've been doing this for some time with some tiny 20c packs in 2p and 4p to get the amps necessary for these big setups before I buy the big expensive packs. So far, it's been working out great. Some times cheaper going 4P, but rarely lighter.

[Jesse J]

Ya, my latest kick (mainly 'cause I'm a poor student still-and they were in stock) is the 3.6 aH Turnigy packs for $20-$30 a pop that are 30-40C and double, triple or even quadruple them up. I built me a 4P adapter out of 5.5mm bullets and have a great long and punchy ride. I spent $150 for a nice suite of identical batts (4x2S, 2x3S, 2x4S and 2x5S) then I can do many configurations in 2-4P.