aaronski wrote:I'm new to the forum and found your backpack in this thread intriguing. how hot does the battery/controller get inside the backpack?
Batteries are stone cold. Controller's warm-ish, probably because the batteries are sinking a lot of heat out of it. Plus, even if it is an enclosed space, the mesh of the thing's weave isn't particularly fine, so there's at least a small amount of airflow through it.
aaronski wrote:I read to the end and thought, perhaps a hotplate and a heat spreader like baking dish might spread out the heat and last long enough to soften the plastic.
Possibly, but I'm thinking that's way too great of an effective surface area increase for any material to spread heat around evenly enough to avoid charring at the heat source, save for, perhaps, a flat heatpipe. And the problem is mostly that 2ft^2 of surface area just exposed like that is capable of convecting quite a bit of heat to air. Looks like I'm going to have to make it an actual box instead of just...uh...the sides of a box.
Oh, and my grandma basically ran over the thing.
It's all bent now. Oh well, I was gonna take it apart, anyway. Deal with that whenever the mica gets here.
You know, now that I think about it, I wonder if the "HC" addendum on the plastic's title has something to do with it working at a slightly higher temperature than normal ABS, because I noticed that the beige plastic sheet was more difficult to bend on the heat strip (need to re-do that too, I think) than the black stuff...
Also I'm feeling semi-lazy because it's almost 6AM and I only slept from about 11:30 to 3 because it's too damn hot in here. I woke up sweaty and pissy, and am not really in a mood to go look for a DC/DC capable of turning wattage from a 44-88V battery back (yes, adding a relay system to the packs) into 12V and, say, 5A to power the fans, pump, and temperature monitor. Anyone care to do it for me?