I install thirty US Battery 6 volt 250 AH batteries on Sept 4 2009. This time, I made changes to the fiberglass battery box by coating the surfaces with acid proof epoxy coating. Install a explosion proof and acid proof inline exhaust fan which is connected to the battery box with acid proof pvc thick wall tubing.
The exhaust outlet of this tubing is connected to a pvc exhaust tip which extends down and to the rear like a exhaust pipe. Before placing the batteries in the battery box, I lay in a 1/2 inch of baking soda for setting the batteries on. The batteries post are auto type with a stud on top. Used very heavy duty battery clamps that go around the post torque to 75 inch lbs. The torque the top stud to 75 inch lbs which puts addition internal pressure to the battery clamps. Drive the first 5 miles at about 100 battery amps and retorque the battery connections again, which may loss up to 5 inch lbs which is normal. Coat all the battery connections with petroleum jelly. I have recorded every single daily run which I use a five mile run as a bench mark. My first run back in 2009 at five miles all city driving at 30 mph, the battery display a ampere usage of 22 ah which was battery cycle No. 2. Yesterday, I completed the same 5 mile run and the ampere hour usage was 17.8 ah. The number of charging cycles are now at 3191 cycles which the battery SOC never went below 90 percent. If one full battery cycle is counted at one cycle at 50 percent SOC, then at 90 percent SOC equals about 1700 cycles. I then calculated I should go another 4.8 years or a total of 9.6 years never discharging below 90 SOC. The last pack which was a Trojan 245 Ah pack went 8.6 years which was still ok on level driving. In hill climbing which is about 50% of any runs I do, was very slow. I gave the batteries to another guy that built a EV and he drove it for another 2 years using the best 20 batteries for a 120 V battery pack. My next battery pack, may be the Nissan Leaf Modules stack up for 255 volts which will be 1500 lbs lighter than the batteries have now for a 20 mile increase range on the level and 6 mile increase range on hill climbing. Is this a good choice or is there any other battery that will work as good? Roland -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20140630/fd609679/attachment.htm> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
