July 16 – August 3, 2008
It’s been a while since I did an update, partially because I haven’t done much and partially because I haven’t had much to do. The good news is I finally got my classroom cleaned, but with each good thing comes the bad – I’m still waiting on the remainder of my order. To be fair, I did get a care package from Belktronix – part of my BMS (battery management system) came and that is what I have been working on. I did make the quick trip to visit the in-laws and got some things around the house done, but it was a mini “not working on the EV” vacation.
The BMS – it truly is a whole lot of wires! First there is the circuit board that has 8 hook-up points and a temperature sensor. One set of wires comes directly from the battery, one set goes to a power resistor, one set is for the OVP (over voltage protection) and the other is for LVP (low voltage protection). Each unit is custom designed for the size and type of battery (group 31, AGM in my case) and all 12 of them work as an integrated system. The three components I am still missing work with these BMS’s so all I can do is wire them up. The wiring pretty much follows the power cables (the big 2/0 battery cables). Each OVP and LVP wire is wired in parallel to the next battery in the same order the power cables go. The big pain for me is half of my batteries are in the front and the other half are in the back. So I start with three in the back, make the long run to the front to do six and then to the back to get the last three. I drew a new battery layout diagram so I wouldn’t screw things up – like I said, there are a bunch of wires. I am as far as I can get with these until the other parts show up –but I still have a few things to do to the car.
I also got all of the parts to put together my power brake vacuum pump. When testing the pump though, it came up short of the expected vacuum. I tested it several ways and got the same results. The person I bought it from on Ebay has a six month guarantee, so it is going back tomorrow. I will go more into detail when I get it done, but I expect to save $100-200 over the cost of a pre-made unit you see at the EV website.
To finish on a good note, I had company today. So many times we get to know someone through the internet and yet never get to meet them. So today I got to meet Larry (and his buddy Adam). Larry is a fellow Fiero converter from Columbus, OH (just an hour away). We linked up through EV Album and my blog. Larry vehicle can be seen at http://www.evalbum.com/1866. As many have realized, waiting is part of the game and Larry is waiting. So he borrowed my motor model that I used to build my adapter so he can do more work on his battery boxes in the rear part of his car. To say the least, it was a nice afternoon with a fellow EV converter and Fiero guy – thanks for the visit.
So until I get something else done….