Battery Vehicle Society

So if I've understood right: 22 miles from just under 3 kWh means you're using less than 140 Wh/mile? Excellent :D What was your average speed Greg and do you know roughly how much the Fiat weighs now? I am going to say 150 Wh/mile which is what I was aiming for, or 225Wh/mile at the wall. Average ...

geekygrilli wrote:This is great info...

How many miles have you done to remove the 41Ah?

22 miles

I used 8mm threaded rod cut into 40mm-50mm lengths last time on my 30 TS 200ah cells. I needed studs and nuts to fasten interconnect with a decent amount of torque, and then fasten bms board lightly on top of that with another nut. I used spring washers as well. Cool, I will use just normal steel t...

I made some very crude measurements of voltage sag on my journey to work this morning. The current readings are taken from the e-meter and pack voltage from the Paktrakr. Each instrument only updates about once a second, and not at the same time! Also had to concentrate on driving and trying to hold...

I have my new Li-ion cells and am not happy with the supplied interconnects. http://www.go-ev.co.uk/images/Misc/Image017.jpg Problem is that after a drive some are warm while others are not. Also the slot head aluminium screws are not very good. I have got a quote for making up some interconnects fr...

I have added a picture above. What current have you been pulling? What Voltage sag have you seen so far? Peter At 50 mph I am drawing around 100 amps. Will pay better attention to voltage sag and report tomorrow 50, 100 and 200 amp sags. So far the most I have seen is around 2.75 volts per cell unde...

O.K. Peter since you asked so nicely here is a not very good picture. http://www.go-ev.co.uk/images/Misc/Image015.jpg I was short some interconnects so used the ones I had lying around. You can see my chargers connected. I charge with all of them until they get to the constant current phase then for...

On Monday night I collected my 24x 100ah cells from David. Last night fitted them into my Fiat 126 after fully charging them. At the moment I am using 6x Ring RSC16 Smart Chargers. Although these are designed to charge all types of lead acid, including sealed and gel cell batteries, they provide con...

Peter Hopefully have something to post by the end of next week. I have taken a different approach to you in that I am connecting together "off the shelf" components. I have a programmable controller from http://www.splatco.com/cc16p1.htm as the brains and am using BMS boards designed for e...

I printed your latest schematics etc off last night but haven't looked at them properly yet. Also consider that for option 1 if your wires to the charger short together that will drive the charger voltage high regardless of the extra resistor. Could this possible damage the charge? I don't know but ...