Hi Everyone! Looking for some advice on how to setup my new battery pack. I currently have on my board a zippy compact 5s lipo 4500mah 35C continuos discharge (157 continuos amps at full throttle and over 200 amps - 45c - for bursts) which gives me 12km of range and 36km/h top speed. I’m 60kg, using street wheels, 260kv motor and 16T to 36T ratio.
I have now bought 21 Samsung 18650 30Q because I was planning to do a 7s 3p setup to increase range and top speed but I’m getting some doubts about the performance I can expect from this pack. From my understanding, since I have a higher voltage pack (passing from 5s to 7s) I should get the same performance with lower amps (P=V*I). This 7s pack should deliver up to 60amps (being a 3p) which is anyways what the vesc was limiting the current at even in the previous setup. This being said, I was expecting to get: -higher top speed and acceleration given the higher voltage (same current, higher voltage --> higher power) -at least doubling the range since I have 9000mah capacity (3x3000mah) and 40% higher voltage.
Now, reading more about it I’m starting to get worried about the amps you can get from a 3p setup and wondering if:
A) would I be stressing the batteries too much and (or) even just not get good performances out of it?
B)should I use the 21batteries I have (leaving one out) for a 5s4p setup to increase withdrawable current? I know I’d be reducing the voltage but the current set up I have with the current 5s lipo is already a beast… It starts uphill and accelerates fast without pushing (without getting hot!) Just not sure I can compare performances of lipo and 18650 just simply looking at voltage, capacity and amps. BTW this setup is very tempting also because I could skip the BMS and keep on using my charger.
Any advice or experience you had will be very helpful! I’d love to avoid having to set up the battery pack and take it apart several times to try all the combinations