jonescg wrote:4P boards are in!
What does this mean? I can build you a 14s4p battery which weighs about 8 kg, stores 1 kWh and is just 252 mm long, 100 mm wide and 150 mm tall. It can be balanced effortlessly with a Hyperion 1420 balancer, and can be charged with a standard 58.4 volt KingPan style charger from Cell_Man or the like. You can even get 3 of method's 5S "Complete HobbyKing LiPo Protection Kits" and they solder right onto the packs.
All I need is for HobbyKing to stock more 40C cells...
jonescg wrote:Kits for overseas buyers:
For the keen DIYer, I can send the boards and tinned copper to you. You can order the cells from HobbyKing yourself, and pay whatever shipping it comes to yourself. You will need to know what you're doing with a pair of big soldering irons, and be well prepared. I can guide in this area
For a 38 volt, 15 Ah pack like the one pictured, I reckon I could sell the kit minus cells for $80 plus shipping (which won't be much). Can't get over the high cost of cut copper...
jonescg wrote: I have my own ideas for EIG cells, but they will be 2P, maybe 3P depending on the application.
jonescg wrote:I don't think their system is as space efficient as it could be. Sure, to have a nice box to put them in is handy, but their terminations are bulky. I reckon I can do a better job
jonescg wrote:Just finished two of Rodney64's 6 packs.
Isn't this the most compact 15 Ah, 22 volt pack you've ever seen?
I still need to solder the balance leads in, as well as the 90 degree bolted terminations. But I was surprised at how quickly they come together. With a bit of practice I should be able to belt out a 24s3p pack in a day.
I have also taken about 3 gig worth of instructional footage, and while I could stitch it all together and upload it to youtube I might just wait for DeVries to chip in.
Sounds goodjonescg wrote:I have the irons on for about 10-12 seconds, and most of the heat stays in the copper block while the solder melts. The cells will only really get the last bit of heat as the solder on the tabs gets molten, and this is only quite brief. As the whole lot sinks down I take the irons off and dab it with a sponge and cold water. I always feel the cells afterwards to see if the got hot, but nothing does. The tops of the cells get a bit warm, but within about 30 seconds they are cold again.
I would stay away from PVC electrical tape because it leaves leaves a horrible mess. Kapton tape might be better or even sheets of thin polycarb / lexan glued over the bars on each brick or group of bricks and then you could wrap the bolted connections in self amalgamating tape.jonescg wrote:And yes, for the mercy of Dog I will be insulating the terminations! I don't know what would be ideal, maybe Kapton tape or just a few rounds of PVC tape? I want the balance leads to stay out of the way as best I can manage.
Rodney64 wrote:Looking good Chris but I would be feeling better if I had a frame to put it in. How did the shed handle to storm. 150 high is that to the top of the terminations.