Over on the Brammo Owners Forum, user BrammoBrian (a/k/a Brian Wismann, director of product development at Brammo) answered some questions that have been vexing us about charging the Enertia Plus and the Empulse.
The Enertia Plus will be fit with an 850W on-board charger that will charge from a typical 120V/15A household outlet. As you’ve mentioned, 12A is the maximum current draw to leave appropriate headroom on the line. During the beginning of the charge cycle with the bike near full discharge, the charger will draw 12A for perhaps the first 5-10 minutes, then it tapers off to a fairly consistent 10A for the bulk of the charge. From about 95% onwards, it enters constant voltage mode and the current will begin to drop off to less than 1A at 99% SOC.
At this point, it looks like the Enertia Plus and the Empulse will have a custom connector accessible that will allow them to be “fast charged” from a Brammo off-board charger. The first fast charge stage will allow you to charge at 17A with the charger plugged into an 120V outlet upgraded to a 20A breaker. The second stage will allow charging at 34A with the charger plugged into a 240V single phase household dryer outlet. This project is still in the works, so I may be revealing too much too soon, but I figure you guys (and gals) are here to get the inside scoop, so now you’ve got it…
Suh-weet. The ability to charge in half the time would make a big difference in my “recreational miles.” Right now, if I take a decent ride on a day I’m playing hooky from work, I plug in as soon as I get home, have a bite to eat and then want to ride some more. But at 10-12 amps of juice pumping into the battery, I need to cool my heels for a couple of hours. Either I need to eat slower, or that bike needs to charge faster. Sounds like I might have some options in the future.