Bike Forums - E-bike expense

Hi Peeps, a few more questions from me that I was hoping to get some help with:

In the future i'd like to to put an e-assist on my V3 Mundo as although my commitment to car-free is for 12 months, I honestly doubt I will go back to car driving for 99% of my daily life after the 12 months expires. I know Yuba sells a kit and E-Bikes sells a kit- has anyone had any experience with these and have a preference? Is there a less expensive way to go?

What other expenses are there to doing this, I know I need new brakes...anything else?

What is maintenance like on them (the assist part)? Is there any?

Do they recharge while you pedal or run off a battery only?

Sorry if there are very basic questions, I'm really new to all this. If someone had said I would be riding a bike everywhere to me six months ago I would have fallen off the sofa laughing.

I have posted this in both forums (electric/utility)just in case.