Charging when ebiking - Page 1
Forum section: electronics / beginners

author: Thomas Martinussen
author_rank: Newbie
timestamp: August 11, 2019, 07:08:53 pm
content: Hello!I wish to charge my spare battery when ebiking (hiking). Ebike have a trailer with some room for a solar panel. Bike battery is 36volt, and 14a. 220 volt home charger charges the battery with 1,8a and 42 volt. (1,8ax42v-75w)? Is this possible?

author: TheHolyHorse
author_rank: Regular Contributor
timestamp: August 11, 2019, 07:20:20 pm
content: I don't know the power of a typical solarcell that's gonna be suitable for your application. But as long as you can get good enough power from a solarcell to be worth it, sure it's most certainly possible.

author: langwadt
author_rank: Super Contributor
timestamp: August 11, 2019, 07:22:58 pm
content: maybe,https://youtu.be/wOyITnO7QZ0

author: richi
author_rank: Newbie
timestamp: August 11, 2019, 07:52:12 pm
content: Hi, not realy.I Charge my e-bike with Solar in my Gardenhouse. I have 2 Panels with around 170W. The Voltage what you get is not enough from the standard Panels (19V-21V), you need 2 with serial.The good Solarcharger makes MPPT, this is a technique for maximum performance of the Panels (Voltage and Ampere for max Watt).I charge an 12V Battery, this drives my automower, camera, and many others. If ich Charge my e-bike i use an Step up driver with adjustable Current and Voltage. I have noticed that most e-bike batteries are very sensitive to the voltage applied. 41,8V --- with 42,8V Bike says Battery error :-(.You made many equipment for this way to Charge, I think it is easier to take a charger. Low weight ;-)

author: TheHolyHorse
author_rank: Regular Contributor
timestamp: August 12, 2019, 07:56:57 am
content: As long as the panel outputs enough power you can just boost it the actual voltage output from the panel doesn't really matter. You're gonna need additional circuity to handle the charging anyway.

author: Marco
author_rank: Super Contributor
timestamp: August 12, 2019, 10:45:29 am
content: If it's a highly proprietary battery system you'll probably need to make a round trip through a 12v battery. Charge 12v battery, run official charger off an inverter for a while until 12v battery goes too low, turn off the inverter and repeat.Possibly the hysteresis of the undervoltage lockout of the inverter would be enough to make this work.

author: Domagoj T
author_rank: Frequent Contributor
timestamp: August 12, 2019, 11:22:13 am
content: Are you talking about charging the battery while riding the bike?It is possible, but requires a bit more than "some room" on the trailer. It requires quite a big panel.https://electrek.co/2018/09/27/solar-powered-electric-bicycle-journey/That guy went from France to China (12 800 km) in 64 days. That's 200 km per day. And he was not even the fastest! The fastest guy did it in less than 45 days.https://www.thesuntrip.comSo yeah, it's quite possible. Especially if you don't need to drive 200 - 300 km per day.

author: Marco
author_rank: Super Contributor
timestamp: August 12, 2019, 12:40:52 pm
content: That's going to mean interfering with the power system during operation ... hope you don't have something highly integrated and proprietary like Bosch, because that would give you a lot of pain. A motor system with open specs for compatibility with 3rd party batteries, like the motor mentioned in the above article, would make life a lot easier in that regard.