lipos

[saleens7]

the motor pull about 75 amps....the batteries are rated for 40 amps, but run the best around 35-40 amps....but if i run them in parallel, i wont get the required voltage...but if i dont i will be pulling too much amps for the batteries to handle...

basically, ill need to either run four 4S packs with 2 groups of two pack running in parallel or either run two packs not in parallel but i woll be pulling too much amps for the batteries to handle....with both options, ill either have to replace my esc or motor....did i get this right? i think i did....correct me if im wrong...

how many amps does a feigao 14XL pull??

[saleens7]

if i wire two 4S packs in parallel, then wire another two 4S packs in parallel and connet the two groups of two packs in a series to double the voltage, that will give me the desired voltage AND current and capacity ability, but will this be too many cells for my esc to handle? it can take up to 10 cells, a 4S has 4 cells right? then all together, the 4 packs will have 16 cells, WAY more than my esc can handle...is there any 14.8 volt pack that already has around 20C that i can just hook both up in a series so i wont have to get a new esc?

[sjslhill]

Nope, nope, nope, nope....when you parallel you do not count the added cells. 14.8V is 4 cells, period.

If you wired two 14.8V in series, you have an 8 cell count.

[saleens7]

so if i run 4 4S cells (two groups of 2 packs in parallel) and then connect the two groups in a series, i will essentially have two 4 cell packs with double the current ability and capacity as a regular one....thats good, but it means more cash to earn to buy the packs......
i think i have figured out what ill need to run lipos in this boat then....

but what else will i need (balancer, lipo cutoff, etc.)??

thanks for the help Battlepack, i really needed it)

also, how would i wire two lipo packs in a series?

[sjslhill]

Woops, forgot you needed alot more voltge, your wanting 29.6V

[saleens7]

where can i find 20C lipo packs?

ive been looking in all the regular places and all of the 14.8V pack are only 10-12C....

[sjslhill]

How many Volts are you running again?

[saleens7]

29.6 volts

[sjslhill]

Geewizz.....if you want my honest opinion, sell that boat and get two of something else. LiPoly is cost you a fortune if you run 20C packs.

[saleens7]

but i can still run 4 4S packs in the way i described earlier..... (i think ill also use these packs in the Drifter L once i get that started....)

if i do, ill be spending 240$ on batteries....but i cant go nimh becuase by the time i can get them you probably wont have enough left of those 400 old IB3600 cells left...this sucks, either i spend a whole lot of cash on a reliable lipo setup, or go the cheap way and use batteries that will eventually fail on me anyway.....

[sjslhill]

There will be NIMH cells around, stay with that if I were you.

[saleens7]

ok, in that case, i will.....but i will probably have to use expensive lipos on my drifter.....but thats fine with me, i was planning on spending way more than 1000$ on that build anyway.....

anyway, thanks for the help, i basically went from a lipo newb to almost completely understanding them in about one day thanks to your help...

[saleens7]

how to run lipo's in parallel? any pics of it?

[sjslhill]

Two black wires together and two red wires together for parallel.

Series would be + - + - The + - in the middle would be joined.

[saleens7]

you mean like this? i can understand a picture better, so just make sure i made one....