Haven't done an update in a while but lots of stuff to report. Got the 1 going in mid August and have since put about 4400 miles on it. I'm doing around 1300 miles/month. I've saved $1133 in just over 3 months
, well on my way to the estimated $2500-3500/year when I decided to build this thing! At this clip, by next August I'll have saved about $4500! And this is after deducting for property taxes and insurances costs.
A bit of disturbing news now. Today I hit the 10,000 mile mark on the pack and I've noticed a significant drop off in the capacity of the Calb pack.
It's much worse than I expected IF my metering is correct. I'll need to do it again to verify the CA info, I'll explain.
Originally the mileage limit tested to around 110-120 miles. I did a LOT of driving one day last week and when I made it home I was at about 190Ah. Voltage was still OK so I didn't sweat, after all these batteries were tested to about 210+ Ah when new. Being near empty I decided to go ahead and see just how much I could use before serious voltage drop so I drove down the street to stay within walking distance. I ran it down to 198 of the 200Ah capacity per the CA and the controller shut down at 150V or 3.0 VPC as I had set it to do. I walked the mile to the house, took the PC and lowered the threshold to 135V and drove it back.
198Ah wasn't the correct Ah though as the CA had drifted and was showing 5Ah once recharged. That said, it looks like the pack was depleted at only 193Ah
. I don't reset the CA every time I recharge so the error accumulates until I reset it. On this trip, I documented and charted the last 40 Ah or so versus the voltage after no throttle for 5 seconds at each reading on a trip back home but the numbers on the chart aren't in even increments.
So in short, at 10,000 miles it appears my Calb pack purchased in January 2011 has lost about 9% capacity. I need to test it again after resetting the CA to verify this. If this is the case, it doesn't look good if this capacity decrease is linear. By the time I reach the 100K mark, I'll have no pack but I'll still have saved an estimated $22000 or so which will completely cover the cost of the conversion and several thousand dollars to boot. In reality I'm not convinced it will last that long. At the rate I'm going now though it won't take long to find out.
I'll continue to document my capacity and mileage over time and repost it if my old head remembers to do so!