RC-Monster Forums - View Single Post - Li-Po or NiMH? I'm confused.

lipomax · 03.13.2005, 09:00 PM

Liborland: If you haven't gotten into brushless yet, let me give you my 2 cents. If you go with an 18 cell controller for an emaxx and want to go Lipo, you have to have some high discharge lipos such as the Kokam 3200 which are 20C. However, those packs are not as energy dense as Polyquest or Thunderpower packs. Approximately 30% LESS energy density. For long runs and excellent speed, I suggest going to a controller that can handle more cells and going 8s 3500 polyquest packs. The difference between those packs and Kokam 6s3200 is only about 1.5 ounces per pack, but you're getting 33% more voltage and 10% more capacity!

Go 8s, and go with something in the 1000-1200 KV range. With that setup, you'll cruise around in first gear around high 20's or 30 mph for almost 30 minutes and second gear will take it to 40 mph w/o even breaking a sweat. Not to mention, insane torque.

The reason why I haven't done that is because I've still got the stock chassis and need my lipos to FIT into the stock 6 cell trays. So, the most powerful batteries that fit into the stock 6 cell trays is the Kokam 3s 3200 packs. I do have the 4s 3100 polyquest so I can go 8s also - but I'm not interested in going super fast anymore. If I had the 1200 motor, I'd go 8s. Figure 8s is almost 30 volts and with 1600 KV, that's 48,000 rpm - too much for good efficiency. A 1200 KV at 30 volts is 36,000 rpm - much better!

Problem is, controllers that allow you to go many cells cost more. I'm presently using a Schulze 24.89 which is slightly beyond it's limits when I run 8s but I got the controller for "only" 259$.

Heck, I think I might just go and buy that 1200 motor... So I can do what I preach.

	(#3)
lipomax RC-Monster Carbon Fiber Offline Posts: 191 Join Date: Feb 2005	03.13.2005, 09:00 PM Liborland: If you haven't gotten into brushless yet, let me give you my 2 cents. If you go with an 18 cell controller for an emaxx and want to go Lipo, you have to have some high discharge lipos such as the Kokam 3200 which are 20C. However, those packs are not as energy dense as Polyquest or Thunderpower packs. Approximately 30% LESS energy density. For long runs and excellent speed, I suggest going to a controller that can handle more cells and going 8s 3500 polyquest packs. The difference between those packs and Kokam 6s3200 is only about 1.5 ounces per pack, but you're getting 33% more voltage and 10% more capacity! Go 8s, and go with something in the 1000-1200 KV range. With that setup, you'll cruise around in first gear around high 20's or 30 mph for almost 30 minutes and second gear will take it to 40 mph w/o even breaking a sweat. Not to mention, insane torque. The reason why I haven't done that is because I've still got the stock chassis and need my lipos to FIT into the stock 6 cell trays. So, the most powerful batteries that fit into the stock 6 cell trays is the Kokam 3s 3200 packs. I do have the 4s 3100 polyquest so I can go 8s also - but I'm not interested in going super fast anymore. If I had the 1200 motor, I'd go 8s. Figure 8s is almost 30 volts and with 1600 KV, that's 48,000 rpm - too much for good efficiency. A 1200 KV at 30 volts is 36,000 rpm - much better! Problem is, controllers that allow you to go many cells cost more. I'm presently using a Schulze 24.89 which is slightly beyond it's limits when I run 8s but I got the controller for "only" 259$. Heck, I think I might just go and buy that 1200 motor... So I can do what I preach.