I’ve started doing some bike delivery and decided I’m putting down enough miles that an e-bike kit would be nice. My goal is ~30mi range. I don’t mind helping with pedal assist getting going and when hills start to get steeper, but I’d rather not have to be pedaling all the time. Lastly, and most importantly, I don’t have a ton of money to throw into this experiment. If it all works out great I’ll upgrade to a better system in the future.

My questions are is an ebike fine to ride in the rain? Would the 36v motor be enough power to not need to pedal most of the time in a fairly flat area? Will a 15Ah battery get me around my 30mi range goal? I weigh ~150lbs. And the kit I’m looking at says 250-350w kit in the title, but 250w motor in the specs. Thoughts? This is the kit and battery I’m looking at. Let me know if you know of something decent for cheaper.
Kit - https://www.greenbikekit.com/electri...-bike-kit.html
Battery - https://bmsbattery.com/ebike-battery...r-battery.html
Also, are batteries like that generally easily removable to take inside to charge or do I need to bring the bike in the charge it?