Electric Newb Question

[revo_rob_1984]

I understand about the wiring batteries in series and parallel but my main question is that if my two 7.2 volt batteries are wired in parallel is it still putting out 7.2 volts and just doubling the MaH????
then if this if this is true then in theory i should be able to wire up 4 batteries in parallel and then using one series connector and be able to get twice the run time with all the punch, right??


If i am completely wrong in my thinking please let me know cuz as you all can plainly see in the title block i am a complete newb when it comes to electric

P.S. I have no intention on going lipo

 

[NitroRC4Life]

well first, I know a little bit about electric so here goes, No if you run two batts in parallel or series you will double your voltage so two 7.2v are gonna be 14.4v and series will make more power, and parallel will double the run time, or vice versa (IDK) and for you to wire up four batts you would have to wire your own connector to have 4 female ends, and one male, a normal series or parallel just has two female and one male but I think four batts to one or two motors is a lot!

 

[Lessen]

I may be a little confused as to how you are thinking of wiring 4 packs. It sounds to me like you want to have to sets of packs, each wired in parallel, but then the two sets wired in series? If that's so then you would be at twice the voltage and twice the capacity of one of those packs (if one packs is 7.2v and 4500mah then your entire setup would be 14.4v and essentially 9000mah)

I think.

 

[revo_rob_1984]

Lessen you are exaclty correct on how i was thinking of doing that, so i could honeslty do that and not be over my voltage???. . .my esc can handle 14.4 volts

 

[NitroRC4Life]

so what you wanna have is two batts in parallel, then the same for two more. And then put a series connector to the four packs in parallel?

 

[revo_rob_1984]

yup exactly, just wondering if it is possible, and to not be over my voltage

 

[NitroRC4Life]

well I'm pretty sure you will be able to do it but how many volts is each pack?

 

[revo_rob_1984]

7.2 1600MaH

 

[NitroRC4Life]

well unless you have a esc that will handle 28.8v of power than know because for eac set of packs that are in parallel will be 14.4v and then both of those in series will be 28.8v. So no unless they make an esc to hold that! srry dude

 

[hamz9561]

If you wire 2 packs (7.2v) in parallel, you will have 7.2v out with double the capacity if the batteries have the same mAh rating. Then running them in series with another like setup will give 14.4 v not 28.8v like was stated in the previous post.

 

[Lessen]

I mistakingly did this up with 7-cell packs but the same holds true.

 

[NitroRC4Life]

If you wire 2 packs (7.2v) in parallel, you will have 7.2v out with double the capacity if the batteries have the same mAh rating. Then running them in series with another like setup will give 14.4 v not 28.8v like was stated in the previous post.

I'm sorry if I was wrong but i just wanted to know how you put two packs together and dont have double the amount of volts? how do they stay the same? I was just wondering about that! thanx

 

[Lessen]

I'm sorry if I was wrong but i just wanted to know how you put two packs together and dont have double the amount of volts? how do they stay the same? I was just wondering about that! thanx

If you wire two packs in parallel they voltage will stay the same. If you wire them in series the voltage doubles. Check out my handy diagram...

One battery pack is wired in series. Positive to negative to positive to negative etc. That's how you get 7.2v for six 1.2v cells. Add one more and you get 8.4 etc.

Now parallel wiring is essentially splitting. Positive to positive, negative to negative. When you do this you maintain the same voltage. If a 6-cell battery pack were wired in parallel it would only output 1.2 volts no matter how many cells it were. It would also have crazy capacity. If it were a 5000mah cell then the pack would be 1.2v / 30000mah. Not a whole lot of power, but lots and lots of runtime.

If you check out my diagram in my previous post you'll see that two packs on the left are wired together parallel (the leads of the two packs connect via like poles). Therefore the voltage remains the same as one pack but the capacity is equal to the sum of both packs (8.4v / 2x mah). Now there are two sets of these. Those two sets are wired in series so you get the voltage that equals the sum of both sets (16.8v) and capacity that equals the average of both sets (2x mah).

Here are the same 4 packs wired completely in series..

 

[revo_rob_1984]

hey lessen thank you for clearing that up for me, now i have a plan to get crazy long run time and lots of punch. . .hehe. . .i'll keep every one posted on how/if it works the way i want it too

 

[NitroRC4Life]

thanks lessen. I just wanted to know so I know for later when I an electric but rob. thats gonna be one sick car!!! good luck

 

[revo_rob_1984]

yeah its gonna be fast and its gonna be fast for a long time. . .i can't wait, i'll keep everyone posted on my progress

 

[ecajoe]

before you do that just be safe you could be upin your amps you will still have a low volt and high amp

 

[Brushlessboy]

well first, I know a little bit about electric so here goes, No if you run two batts in parallel or series you will double your voltage so two 7.2v are gonna be 14.4v and series will make more power, and parallel will double the run time, or vice versa (IDK) and for you to wire up four batts you would have to wire your own connector to have 4 female ends, and one male, a normal series or parallel just has two female and one male but I think four batts to one or two motors is a lot!

If you re read this you will get more confused...
Running batteries in parallell doubles the Mah rating and NOT the voltage.
Running is series doubles the voltage.
What you need to think about is the fact that runtime is great, but your electric motor need time to cool down, so constant running will see you continuously buying new motors, and probably complaining that they must be faulty.
The other point is that 4 NiMh packs will weigh so much that you speed will be down probably 30%, and the load on your motor will be increased considerably... See above....
I have to assume for some reason that you can't just buy higher amp packs.
Not a good idea really.

 

[revo_rob_1984]

If you re read this you will get more confused...
Running batteries in parallell doubles the Mah rating and NOT the voltage.
Running is series doubles the voltage.
What you need to think about is the fact that runtime is great, but your electric motor need time to cool down, so constant running will see you continuously buying new motors, and probably complaining that they must be faulty.
The other point is that 4 NiMh packs will weigh so much that you speed will be down probably 30%, and the load on your motor will be increased considerably... See above....
I have to assume for some reason that you can't just buy higher amp packs.
Not a good idea really.

i was actually thinking that my self and got rid of my idea completly for the simple fact that as you said it will increase the weight and put more stress on my motor, and as far as higher MaH packs its a mini-revo and i WILL NOT go lipo, i don't like the mini on lipo, it never wants to settle down so i am just gonna do NiMh and the biggest ones i have found for the mini is 1600's