RC-Monster Forums - View Single Post - On-road BL project

BrianG · 08.17.2006, 12:43 AM

Wow, I guess I am OK then. I just don't like heat in my electronics - I get upset if my Athlon64 CPU gets above 113 degrees! I'll get a better feel for the real temps when I take it out and really put it through its paces at full speed. When I got the ESC I figured since the battery voltage at 2s wouldn't be high enough to cause the BEC to heat up too much. But that MM heatsink is sooo tiny! Makes my Quark look like a monster!

Even though my 2s2p emoli pack seems to hold up very well, I am a bit concerned about them. When I try to charge them at 6A (1C), I get a "voltage too high" alarm on my Hyperion 7i, even when hooked to the balancer. What I do to counteract this is charge at 6A until the voltage gets to ~8.3, then I lower it to 5A. This makes the voltage go down to ~8.0v. I again wait until the voltage reaches ~8.35 and then lower it to 4A, which reduces the voltage to 8.0v again. I keep doing this until I get down to 3A at which time it will charge properly without the alarm. During this, the LBA10 balancer LEDs flash for each cell at various times meaning the cell voltage is too high or each cell is out of balance. So, what I think happens is that the charger gets to 8.38-8.39v while the balancer is discharging and when the cells become OK, the reduced balancer discharge load causes the charger voltage to increase a little to the alarm stage. That's why my procedure, as tedious as it is, works. It is always right at the point where the charger switches from constant current to constant voltage mode. Is this common for people with emolis?

	(#83)
BrianG RC-Monster Admin Offline Posts: 14,609 Join Date: Nov 2005 Location: Des Moines, IA	08.17.2006, 12:43 AM Wow, I guess I am OK then. I just don't like heat in my electronics - I get upset if my Athlon64 CPU gets above 113 degrees! I'll get a better feel for the real temps when I take it out and really put it through its paces at full speed. When I got the ESC I figured since the battery voltage at 2s wouldn't be high enough to cause the BEC to heat up too much. But that MM heatsink is sooo tiny! Makes my Quark look like a monster! Even though my 2s2p emoli pack seems to hold up very well, I am a bit concerned about them. When I try to charge them at 6A (1C), I get a "voltage too high" alarm on my Hyperion 7i, even when hooked to the balancer. What I do to counteract this is charge at 6A until the voltage gets to ~8.3, then I lower it to 5A. This makes the voltage go down to ~8.0v. I again wait until the voltage reaches ~8.35 and then lower it to 4A, which reduces the voltage to 8.0v again. I keep doing this until I get down to 3A at which time it will charge properly without the alarm. During this, the LBA10 balancer LEDs flash for each cell at various times meaning the cell voltage is too high or each cell is out of balance. So, what I think happens is that the charger gets to 8.38-8.39v while the balancer is discharging and when the cells become OK, the reduced balancer discharge load causes the charger voltage to increase a little to the alarm stage. That's why my procedure, as tedious as it is, works. It is always right at the point where the charger switches from constant current to constant voltage mode. Is this common for people with emolis?