Recent content by Teslafly

This project is dead. The enoid bms (https://www.ennoid.me/) or fox bms (https://foxbms.org/) are good other options.

Does anyone have more information on the c350 and c700? The c350 seems to be a bit optimistic with it's phase amps considering it has 8awg output wires and 2x 12awg input. Looking to power a ME1117. (http://www.motenergy.com/me1117.html) The c350 seems like it may be a good fit, if slightly...

So the vesc actually supports the mt6816 encoder ic in spi mode. The main problem is you need to tie pin 2 to 5v instead of gnd and pin 1 is chip select (cs) instead of the 5v in abi mode. There is also someone working to add pwm encoder input support to the vesc. But that hasn't gotten too far...

While I have investigated mid drives, and they definitely have a better torque option, there are a couple of things I don't like: - loss of regen - integrated controller (I eventually want to design / experiment with my own brushless controller) - higher cost - more complex and higher wear. I...

The time has come to build myself an Ebike. With a monster hill on campus when I'm at school, a 4 mile commute to work during the summer (reasonably flat & bikeable, but leaves you fairly winded), and a slight amount of inspiration coming from the Moar kickstarter, the time has finally come to...

All prototypes are currently spoken for. Rev2 may come into existence in 1-2 months. I am currently writing the post detailing this.

Nope. They turned out perfectly. I think I used a -.05% swell and got my stencils from oshstencils. $6 per stencil for a project like this isn't bad.

Progress update Lots of stuff has happened since the last big update, and if that one was a "design" iteration, then this one is definitely a "test" iteration. This post is probably also longer than strictly needed, but I partially want to document this thing so I can go back and look back at...

There are no provisions at the moment for full current battery passthrough. There are two npn power mosfet outputs that could be used to drive a contactor or your own high current mosfet bank though. I made this decision because I figured it was much easier, cheaper, and scalable to use simple...

Well, A lot has happened since my last update. I've been working on the BMS almost the entire weekend and have made lots of progress. (aka, boards assembled, code tested with balance resistors and voltage measurements -intermittently?- working) I'll post the actual update tomorrow or tuesday...

Huh, well I guess that this system wouldn't be the best for them unless they wanted to spend the extra $ for a 6s board that effectively manages 1 cell. You may be better off knocking off a cell or using a cheap Chinese "BMS" for those lower power setups. Blocks of 6s are the best, but if you...

Do you mean 12S system? I am unaware of 13S being a standard, but am aware of 12S, 16S, 20S and 24S being pretty common. Each balance board can handle 4-6 cells, so for 13 cells you would need 3 boards, and because they have a minimum of 4 cells par balancer you would need 5 cells the first...

... Not really. not really at all. All BMS systems are going to have a bit of the same design concepts because they accomplish the same function, but the board you linked to really doesn't have anything to do or contribute to this project. Rather, it is part of the problem it is trying to...

UPDATES! REV 1 is ready for prototype manufacture. The Rev 1 Balancer board has had it's silkscreen cleaned up, mounting "holes" added, and BOM completed. All parts are selected and ready to be ordered. The final estimate for parts cost is ~$18, not including solder paste and other...

Development wise this project has slowed but not stopped as of late. School has been a bit more work intensive and I haven't had that much time to work on this until this weekend rolled around. I have started writing code and believe I have most of the rudimentary communication pinned down. This...