Electro-Fox wrote: The dealer that sells ebikes had the following comment.
The idea of charging your batteries with a solar panel isn't really a viable solution with any quality E-Bike battery, These batteries are high capacity and have been designed to charge most effectively when using the provided charger witch requires 120v at 15amps (standard home outlet). This amount of power would require an extremely large Solar panel set up. Solar panels can not be hooked up directly to any E-Bike battery, you would have need to store the energy via capacitors and have it converted to a 120v 15amp AC so that you could use the charger provided. Bear in mind all Quality E-Bikes use batteries and chargers that work together exclusively using battery management systems.
I don't know who is right...
LOL.. that kind of response is just blowing smoke up your ass from someone who does not understand what they are selling or dealing with. If i were you, i would not be buying anything from that dealer in the future.
120v x 15 amps = 1800 watts. He's saying that the minimum power requirement for a "quality ebike" ( what's the definition of that? ) is 1800 watts at the power source.. now tell me, have you ever seen a production ebike ship with a 1000w or higher charger?
I can't say i have seen such a thing.. 95% of OEM chargers i've seen are in the 100-500w range.
So, obviously you don't need a bare minimum of 1800w of solar panel output.
Also, the bike's batteries' BMS operates independently of the charger 99% of the time, so you just need a component that can convert the solar panel voltage to your bike battery voltage and limit the current, skipping the bike charger that wants 120v AC current altogether. There are some power supplies on the market that can do this. Capacitors are not necessarily required to buffer the charge, but would be helpful.
In my opinion, if you will be carrying solar panels on your bike, i would skip out on this idea entirely because the weight of the panels is going to require more energy under the bike's motion than they will produce. This is because the power density of solar panels is extremely low. We are talking 15-20lbs for a 100w panel that will create 100 watt hours per hour at absolute best if aimed optimally.
For 15lbs of weight, you could have 1.5kw-hrs of lithium battery.. you could build such a battery for around $1000 yourself. charge it up.. bring it to camp, and swap out your battery rather than even bother carrying a solar panel. Because the HPC solar panel is so wildly expensive ( a standard 100w solar panel can be had for $100 easily ), the battery is actually the more economical choice..