tag:blogger.com,1999:blog-369941762441967690.post8646665784839590259..comments2022-11-26T01:46:19.151-08:00Comments on EV Z3: On Battery Balancing and ChargingTim Catellierhttp://www.blogger.com/profile/02801279544184321528noreply@blogger.comBlogger3125tag:blogger.com,1999:blog-369941762441967690.post-18717063089611182682010-12-30T15:10:42.972-08:002010-12-30T15:10:42.972-08:00Hi Tim,
I don't know how I didn't see thi...Hi Tim,<br /><br />I don't know how I didn't see this post before, but it was great to hang out with you and learn about your experience! I haven't given up on the 911 conversion, but it will be a while before I can drop the cash into the project. On to read your more recent posts...<br /><br />Best, <br /><br />AlexAlexhttps://www.blogger.com/profile/00489761192866964078noreply@blogger.comtag:blogger.com,1999:blog-369941762441967690.post-42144675870921291442010-10-19T16:29:42.311-07:002010-10-19T16:29:42.311-07:00Thanks for the comment Gene. I read through the l...Thanks for the comment Gene. I read through the literature on the miniBMS, and it does exactly what I had laid out as optimal in the post. How about that, I'm not as original as I'd thought ;) <br /><br />One thing it mentions is that you can get the boards with, or without the shunting feature. The only problem is that I didn't see the non shunting variety on the products page. <br /><br />If I decide that I want to have a high voltage cut off system, I'll be giving them a call to find out what's involved in getting a system with no power shunting. Thanks again!Tim Catellierhttps://www.blogger.com/profile/02801279544184321528noreply@blogger.comtag:blogger.com,1999:blog-369941762441967690.post-51339632844670200452010-10-18T13:35:14.958-07:002010-10-18T13:35:14.958-07:00Hi Tim,
The BMS idea you have sounds exactly like...Hi Tim,<br /><br />The BMS idea you have sounds exactly like what the miniBMS does - modules directly mounted on the batteries, one wire starts at a little control board, daisy chains to all battery modules, and back to the control board. Any monitor module that detects either batt volts too high or too low will open circuit the wire loop.<br /><br />Here's the good part - the control board gets 12 volts all the time plus the keyswitch on voltage. If the keyswitch voltage is present, there is a relay you can use to reduce motor performance (like turn on valet mode on a Zilla, or add a resistor to the potbox for other controllers) if any battery drops too low. If keyswitch voltage is not present, that means the car is not running and probably charging. An open wireloop means a battery is too high, so another relay can be used to stop the charger.<br /><br />The clever thing is that what the open loop means is dependent on whether the key is on or not, and the control board has the logic to determine what relay to use.<br /><br />BTW I am doing a conversion too, http://www.ebeetle.blogspot.com<br /><br />Good luck! - Gene<br /><br />p.s. I've decided to go lithium after all. I watch the Friday shows :)Anonymousnoreply@blogger.com