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BrianG · 07:27 PM

You really can't calculate amp draw since there are SOOO many variables and there will be spikes of current flow as you accelerate.

You can either get something like the eagletree systems unit, which lets you record and plot your energy usage, or calculate your average amp draw.

To calculate the average amp draw, just multiply your battery Ah by 60 (to get amp-minutes), then divide that by the number of minutes you ran before the pack was dead. This is the average amp draw. Just remember; the actual draw varies widely during the cycle.

Also, this assumes that you drain the exact Ah rating of battery, which is most likely not true. When you pull heavy currents, the real-world Ah rating will go down a little.

	(#9)
BrianG RC-Monster Admin Offline Posts: 14,609 Join Date: Nov 2005 Location: Des Moines, IA	10.05.2006, 07:26 PM You really can't calculate amp draw since there are SOOO many variables and there will be spikes of current flow as you accelerate. You can either get something like the eagletree systems unit, which lets you record and plot your energy usage, or calculate your average amp draw. To calculate the average amp draw, just multiply your battery Ah by 60 (to get amp-minutes), then divide that by the number of minutes you ran before the pack was dead. This is the average amp draw. Just remember; the actual draw varies widely during the cycle. Also, this assumes that you drain the exact Ah rating of battery, which is most likely not true. When you pull heavy currents, the real-world Ah rating will go down a little. Last edited by BrianG; 10.05.2006 at 07:27 PM.