This week I've ridden the Lectra to work twice and had an odd thing happen. It's 10 miles each way. On the trip to work it's 8:30 or so and I barely make it to work, the battery pack hit the wall about a half mile from campus leaving me at a crawl on the side of the road going maybe 15 miles/hr the battery voltage reading (under load) around 30 volts on a 60 volt pack (nominal) etc. The final voltage at rest at the end of the ride was 11.8 volts per battery maybe less. Yes that's damaging to the pack, I know. On the way home, same route, same distance, I make it home fine and the pack voltage is at 12.3 volts per battery or comfortably above 60 volts at rest.
Same distance.. but a very different result. I try to be careful with the throttle but maybe my riding habits in the morning differ from the evening. This is the first time I've seen this behavior. Previous weeks both rides would go fine with ample capacity at the end of the ride.
Something is clearly different this week... The bike is the same of course.
This week is the first cool snap of the season in the SF Bay Area and this may have something to do with the following. Such as, in the morning the pack is cool but in the afternoon it's been in the sun and is warmer.