RC-Monster Forums - View Single Post

BrianG · 10:50 AM

lol, a 200w resistor would be about the size of an ESC! If you look closely, that 200w value is the power dissipated on initial hookup but only lasts for around 50ms (assuming you left the total charge time at 0.25 sec); after that, the differential voltage is high enough to limit power greatly. The heat is not "instant" since any thermal changes take time, and the overall temperature will average out.

Anyway, for 7000µF capacitance and 10s lipo, a 22Ω, 5 watt resistor should be fine. That resistor value would cause the caps to be charged in around 800ms. And that 22Ω doesn't have to be exact, as long as it is fairly close.

	(#6)
BrianG RC-Monster Admin Offline Posts: 14,609 Join Date: Nov 2005 Location: Des Moines, IA	02.24.2012, 10:45 AM lol, a 200w resistor would be about the size of an ESC! If you look closely, that 200w value is the power dissipated on initial hookup but only lasts for around 50ms (assuming you left the total charge time at 0.25 sec); after that, the differential voltage is high enough to limit power greatly. The heat is not "instant" since any thermal changes take time, and the overall temperature will average out. Anyway, for 7000µF capacitance and 10s lipo, a 22Ω, 5 watt resistor should be fine. That resistor value would cause the caps to be charged in around 800ms. And that 22Ω doesn't have to be exact, as long as it is fairly close. Last edited by BrianG; 02.24.2012 at 10:50 AM.