Quote:
Originally Posted by florianz
the negative of high voltage is the extra weight. 4000mah 4s is lighter then 6s 4000mah. every gram of mass extra, you have to accelerate and stop. this causes stress on the components. your cars isn't heavy, so it's not that hard work for a 74mm motor.
I have once read, that in 1:1 car racing every extra kg requires xx horsepower to be the same fast. that's why I don't like today's cars with all that electric extra stuf nobody needs. that's why I like my vintage benz...
|
Your statement may be true that addl weight causes addl stress, but that is not a negative of higher voltage setups. If you run a 4000mah 4s pack and go to 6s, you reduce the mah to get the same runtime. The weight of a battery per watt is pretty much fixed. So if you want X mins of runtime at X speed you will end up with the same weight battery regardless of voltage.
Basically a 4s 4000 packs will equal an 8s 2000 pack. Keep in mind you will run a motor with half the kv for the 8s setup compared to the 4s. Plus amp draw will be less on the 8s setup (half or more) and that will provide better efficiency due to the lesser voltage drop on the 8s setup.
There is no negative aspects to a HV setup. Currently not alot of choice in escs for cars over 6s, and finding a good charger can get expensive. Also, 6s seems to work well for 1/8 scale, so no real need to go up to HV unless you are going for higher than normal speeds, or have a very heavy vehicle.