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Batteries

Should you install a Battery Management System to protect those expensive Lithium batteries?

Posted on:
Wednesday, May 15th, 2013
Author:
Ken

  The 45 cell LiFePO4 battery pack in my electric MR2 costs $10,500. A Battery Management System (BMS) can easily cost another $1200. If you are considering a set of Lithium batteries for your conversion, should you invest in a BMS to protect your batteries or not? I chose not to, and it has served [...]

Posted in Batteries, BMS, Cell log 8, Charger, Instrumentation, MR2EV | 11 Comments »

How I maintain the LiFePO4 battery cells on a monthly basis.

Posted on:
Sunday, March 17th, 2013
Author:
Ken

Key things to remember: 1. DO NOT keep the cell log 8s connected permanently (even if switched off), each pin will draw different amps from the cells.  Some random sampling suggested a range of 2 mA to 790mA.  This doesn’t seem like much draw, but over time, it will eventually cause your pack to go out [...]

Posted in Batteries, Maintanence, MR2EV | No Comments »

Met my neighbor who owns a Tesla Roadster.

Posted on:
Tuesday, July 17th, 2012
Author:
Ken

I recently met my neighbor who owns a Tesla Roadster. He bought it in 2009 and has about 15,000 miles on it and loves it (as I do too!). I’ve not convinced him to let me drive it yet, but I’m working on it! We were just chatting on the topic of renewable energy and [...]

Posted in Batteries, Misc, MR2EV | No Comments »

Battery maintenance and donating gas savings follow-up.

Posted on:
Sunday, July 15th, 2012
Author:
Ken

Well, the consensus from polling other fellow EVer’s is that the loosening of the battery terminals is expected by should go away with time. It makes sense that as we torque the bolts on the terminals they will compress. Compression deformations that becomes permanent (rather than acting as a spring) will loosen the terminals over [...]

Posted in Batteries, EV Club, Maintanence, MR2EV | No Comments »

10,000 mile, 1 year maintenance

Posted on:
Tuesday, July 10th, 2012
Author:
Ken

I just spent 2 hours doing some maintenance on the MR2. Here’s my list: 1. Check tire pressure. OK at 45psi 2. Check all high current connections including battery terminals and NEMA connections * 3. Check all bolts: Racks (found some loose ones!!), CV drive shaft (all looks good here after that last accident!). 4. [...]

Posted in Batteries, Maintanence, MR2EV | No Comments »

Questions about Lithium Battery Recycling

Posted on:
Friday, May 11th, 2012
Author:
Ken

As I’ve met people and shared the my story, I kept getting the same question around Lithium mining and recyling. “Electric cars have all these lithium batteries. Isn’t lithium mining and recycling hazardous and bad for the environment?” Here are my thoughts on this topic. Whether we like it or not, battery technology is here [...]

Posted in Batteries, MR2EV | No Comments »

EV display and Lighted Ammeter

Posted on:
Saturday, December 17th, 2011
Author:
Ken

Now that it’s getting dark early, my ammeter display has not been visible on the drive home from work. Also the original dash lights were also not working, so reading the dashboard was difficult. I purchased some LED bulbs from autolumination.com and now I have a lighted dash and light ammeter. I also replaced the [...]

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Posted in Batteries, Instrumentation, MR2EV, Range | No Comments »

Weight Gain

Posted on:
Monday, July 11th, 2011
Author:
Ken

I got the car weighed again today. 2725 lbs from 2365 lbs… a gain of only 360 lbs! Try that with lead acids!!!

Posted in Batteries, MR2EV, Weight | No Comments »

Pictures

Posted on:
Monday, July 4th, 2011
Author:
Ken

Here are some pictures… EV gauges Charger Located in front. The Manzanita Micro Charger lets me charge anywhere up to 240V and 30amps. Control Boards located in the motor bay behind passenger and driver seats 17 Batteries up front 22 Batteries in the rear Cheap Battery monitor system Be safe! New Suspension System Look ma, [...]

Posted in Batteries, Charger, DriveTrain, Instrumentation, Motor, MR2EV | 2 Comments »

Range Test

Posted on:
Monday, July 4th, 2011
Author:
Ken

So I charged the LiFePO4 cells to 3.4 volts each for a full charge and tested range this weekend. After 82 miles (freeway/local roads – top speed 80 mph on flat), the cells were averaging 3.14 volts each at rest. The battery manual from the manufacturer suggested that at 3.1V the batteries would have been [...]

Posted in Batteries, Maintanence, MR2EV, Range | No Comments »