Parallel & Discharge rate

[gartman]

Hello, I now Know if you run two 2200 mah in parallel it will double ,but will the C (discharge rate) double also ? [email protected]

[Diesel6401]

Hello, I now Know if you run two 2200 mah in parallel it will double ,but will the C (discharge rate) double also ? [email protected]

I don't beleive it does. Only mah is doubled, but the cells c rating is still only it's individual ability to deliver at a specific rate. I may be WAY off on that though. I am looking forward to reading more detailed responses.

[Drag Boat Bob]

When in parallel each battery can deliver current at it's given rate, thus increasing total current delivery.

[gartman]

When in parallel each battery can deliver current at it's given rate, thus increasing total current delivery.

2x 2200mah 25c lipo would be a good match for a 88 volt motor ?

[britscoot]

http://www.offshoreelectrics.com/inf...l-parallel.php

[Drag Boat Bob]

2x 2200mah 25c lipo would be a good match for a 88 volt motor ?

Are you sure about the 88 volt motor?

[Fluid]

2x 2200mah 25c lipo would be a good match for a 88 volt motor ?

Just barely. Using the 80% rule those cells in parallel will supply 88 amps continuous safely...if we can believe the numbers printed on the packs. Based upon what happened with NiCd and NiMH cells in the past I will only trust the numbers on packs from reputable assemblers - and I wonder about those. The consumer has no easy way to test the capacity or "C" rating anyway, and because the consumer bases his purchasing decision on price and "the numbers" the incentive to just "print a label" is huge.



.

[gartman]

are you sure about the 88 volt motor?

yes

[Diesel6401]

2x 2200mah 25c lipo would be a good match for a 88 volt motor ?

Are you sure about the 88 volt motor?

yes

Gartman, I think DBB is saying you have it listed as 88 volts, meaning you would need 4 6s packs in series for that (WOW). I'm pretty sure you meant to say 88 amps. Switching words around can make a HUGE difference.

[Diesel6401]

http://www.offshoreelectrics.com/inf...l-parallel.php

That is written for nimh pack which discharge rate is not factored in for and informs us what we already know that the mah will increase, but what will the discharge rate do is the big question. Good information always in the tips section of OSE.

[Drag Boat Bob]

yes

I thought Jay's intuitive answer above covered your question, but if not could you please give a bit more information concerning what you are looking for.

i.e.
Motor operating voltage
Boat size
Desired use
etc.

[Diesel6401]

When in parallel each battery can deliver current at it's given rate, thus increasing total current delivery.

So it's discharge rate doubles as well?
So 2 5000mah 40c packs in parallel are capable of 800 amps? 10,000mah x 80c = 800amps? If so HOLY S*#@

[Drag Boat Bob]

So it's discharge rate doubles as well?
So 2 5000mah 40c packs in parallel are capable of 800 amps? 10,000mah x 80c = 800amps? If so HOLY S*#@

Unfortunately there are many other variables to take into account (wire sizes, current demand, impedance etc.), but using your example above, each pack can deliver current at 40c (a non-standard rating however). You would get something near double their available current delivery rate.

Keep in mind just because you have a battery "capable" of delivering huge amounts of current, it will only deliver the amount of current demanded by the motor (usage). As the voltage goes up, the current goes down for a given wattage. I x E = W or W / E = I etc.

[Diesel6401]

Unfortunately there are many other variables to take into account (wire sizes, current demand, impedance etc.), but using your example above, each pack can deliver current at 40c (a non-standard rating however). You would get something near double their available current delivery rate.

Keep in mind just because you have a battery "capable" of delivering huge amounts of current, it will only deliver the amount of current demanded by the motor (usage). As the voltage goes up, the current goes down for a given wattage. I x E = W or W / E = I etc.

That part I knew.

Theirs always "variables", unless a eagletree or another type of data device is hooked one may never know the "exact" numbers on our set-ups and with over listed mah & discharge rates it makes it that much harder, that's why I like to provide more then the minuim just in case number are fudged.

I was just not sure about the "C" rating in paralell. All the other info/wiring junk I get. I don't deal with the discharge rates on planes just the series/parallel wiring

Thanks for information provided

[gartman]

Are you sure about the 88 volt motor?

Sorry 88 amp