On Thursday 19 July 2007 12:59, Jonathan Starr wrote: > Each "battery box" is going to consist of four 12V packs wired in > parallel. One complication is that there needs to be a microcontroller > and circuitry to perform battery monitoring and protection.
Take a look at the AVRMega406. http://www.atmel.com/dyn/products/product_card.asp?part_id=3587 Absolutely stay away from Application Note *AVR450* that you may run across for use with anything but Lithium batteries. The 406 examples had a few problems of its own as well. > Additionally, another complication is that the packs need to be charged > in series at 48V. I've had the miss fortune of having to do something similar. It can be done with a few diodes and a few FETs to switch between parallel and series. Look up the TI UC3906, and UC3909, and related application notes at http://www.ti.com for background on charging lead acid batteries. > Basically, the problem is that I lack a background in power electronics. Be careful, there is far more energy in batteries that most people realize, treat them with a lot of respect. Stating clearly your requirements always makes a project go smother. > I apologize if this is an inappropriate place to ask this question, but > finding help is part of my difficulty. :) Thank you in advance for your > help! We are all happy to help, we are however reluctant to do a students homework assignment. -- http://www.wearablesmartsensors.com/ http://www.softwaresafety.net/ http://www.designer-iii.com/ http://www.unusualresearch.com/ _______________________________________________ geda-user mailing list [email protected] http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
