Yes, you could. The leisure battery would need to have about twice the capacity of the bike battery if it's Lithium. More if lead acid. As to pure sine wave, depends on your charger but they aren't that much more expensive. You would need an invertor that has twice the continuous charging rate...
As the fast charger for the Bosch battery is made and sold by Bosch i expect they tested it and it will be safe to use.
I've used it for 5000+ km and range is down 2km.
I put my hybrid bike on a rack on our camper at shoulder height no problem at all (minus battery) There is a secret trick to doing it that I would share, but then I would have to kill you. [emoji57]
Third party cover free with my house insurance. I cover the other risks myself. Try injuring a pedestrian and see how many bikes that will buy them. A few bruises and their good lawyer will cost you half a bike.
I hope that's clear. If you have a12 volt charger you don't need the invertor, but in either case go direct from the battery terminals and not from the controller output labelled load. Keep the wires between battery and invertor as short as possible and use 10AWG just for this part of the...
My bike shop reckoned that one chainring would see off two casettes and at least four chains. You know you can get a gauge to measure the wear on the gear teeth? And wipe the chain down after every 50 or so Kms helps.
Sure, no problem. It's pretty straightforward. You can use one or two or as many 12 volt batteries as you like which you need to wire in parallel. They do need to be identical though.
Then you connect battery to controller first before plugging in the panel. That's it, really. I used a flex...
Here you are. The box that holds the batteries etc is just a plastic storage box with a cigarette lighter socket in the side for use on arrival.
And here is the trailer on the bike. Minus the panel in this picture, but you get the idea.