Reddit reviews Bafang Bike Conversion Kit 48V 500W Rear Hub Motor for Bicycle 20" 26" 27.5" 700C Rear Wheel Kit with PAS LCD Display Ebike Battery and Charger
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[Strong and efficient]---Only compatible with the disc brake, has a rated power of 500W, a maximum torque of 48 N.m, providing ideal power for vehicles. Working together with a cassette or freewheel speed change mechanism, greatly enhances riding comfort and is suitable for touring bikes, commuter bikes and mountain bikes.[Conversion Accessories]--- All necessary mounting accessories are included. Please see the packing list image. Rear wheel & motor(with rim and spokes), battery(four batteries optional).[Speed & efficiency]---Maximum speed can reach 38-40 KMH, 470 RPM, efficiency ≥ 80%. Effective stopping power as soon as you hit the brakes.[Installation Precautions]---Suitable for bicycle rear wheel 20"/26"/ 27.5"/700C. Installation Widths (mm / OLD):138; Max. Housing Diameter (mm):158.5. Upgraded connectors for the controller and a series of accessories, easy to recognize and fast to connect well with all kits in an hour.[Maintenance & Warranty]---1 year warranty and US maintenance service and technical support(US ph:7025766881). If there any issue with it, don't hesitate to contact us, and we will response and solve it within 24 hours. Your satisfaction is our top priority.
Much of the vagueness relates to the nature of DIY ebike builds. There are many ways to build a bike, and many bikes to build upon. Most people approach it in phases:
Sounds like you're at phase 1 :)
There are two foundational elements you'll want to understand before you get started:
Volts, amps, and watts. What are they, and how are they related. You don't need to get your masters in electronics, but understanding the basics will really help you navigate choices like battery voltage and motor wattage.
Watt hours. Understanding watt hours is the fundamental element that will answer the "range" question.
There's obviously a ton more than that, but that's a great place to start. Don't be afraid to Google those terms, either. The more you know!
Based on your requirements, I think a hub motor setup would make a lot of sense for you. Since you're not tackling hills, you won't need the advantages of a mid drive.
Whether you go front or rear hub motor will depend upon your priorities. Personally, I'm not a fan of front hub motors because of the traction issue. I want the front tire to steer only. There's a decent article on eBikeSchool.com - Front Hub Motors Vs Rear Hub Motors.
As far as cost, keeping things under $1k will primarily come down to battery size. There are a ton of inexpensive hub motor kits out there. For a beginner, you'll want to stick with one of the major brands. Bafang is very popular, so components/parts are very easy to come by.
This Bafang 500W hub drive kit is $620 when configured for cassette 27.5" (700c) with the DPC-18 display. You'll also need a battery. To keep things under $1k, you can start with a 300Wh Luna Cycle Mighty Mini Cube battery with bag and charger for $379. Be sure to select the free battery bag and advanced Luna Charger. It has a selector that will let you charge your battery to 90% instead of 100%, which will extend its lifespan. When I configured this on the Luna site, it said the pack was currently unavailable, so you'll want to message them to check on availability.
One of the nice things about this tiny battery is that you can mount it in a small bag that fits under your seat, or in the top corner of your bike's triangle, near the seat. This leaves your water bottle mounts free for water bottles. If you keep speeds under 15 MPH and are willing to contribute effort with pedaling, you can get 20 miles of range out of this combo. You can configure limits to keep you from using up your battery too quickly.