There might be custom voltage/amperage controls and/or electronics that could cause damage to the bike. As I don’t have specs, any “creative solutions” would need to be examined. The wattage of the solar panel and quantity of sun it gets is key. If the panel can’t get enough sun the batteries will ultimately die. It’s just a way to cram extra power in a comparatively small package. Because I’m carrying them, low weight and high capacity is necessary.