Originally Posted by drgrieve
This looks the easiest build I've seen around. I have a few questions if you don't mind:
1. I'm looking at 5p. Do you think that will still be doable with this design?
2. What is the weight of one of your modules (so I can see how much weight to plan for).
3. From others testing it seems that most of the heat manifests at the tabs. Perhaps allow room for a fan to be added later if needed.
4. Are the cooling fins structural or can they be replace by insulators
PS Another vote for video. You might ask Jack Rickard if he is interested in the videos - not sure how turned off them he is after his mishaps.
No worries on the questions, by all means.
1) 4p would work but I am unsure about 5p as you would be distorting the top of the cells a lot. I would ask why do you need 5p? That is a lot of capacity. are you running max voltage of your controller? Even with my soliton1 and a ~250VDC pack I will only be pulling 680amps peak for my motor (170v max). I would try to maximize the voltage limit of your controller with cells in series and then add cells in parallel for capacity and current from there.
2) For 72cells it's about 34kg. The parts only weight ~2kg total so just add that to the weight of your cells. The pack system is insignificant to the weight of the actual batteries.
3)I'd be curious to see that data. I have a design that integrates to PC fans into the top cover but I haven't seen anything so far that would convince me I need to do it. There will be plenty of free airflow on it's own.
4) If you don't think you need cooling (say max of 3-4C) then just eliminate the fins all together. But everything I have seen and read shows that you want some cooling to maximize cycle life.
PS. I actually offered to Jack a couple weeks ago as it was the easiest way to share with people. Most of the video I shot 2 months ago but have been too busy to do anything with it. But Jack wasn't interested in the video and suggested I sign up for EVCON (too far of a drive and I have to work anyway).
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