How do I wire it?

Now I have a 36V electric bike without the battery. A 36V solar panel on a trailer and two 1.5ah 18V lithium drill batteries.

What I want to do: Have the batteries buffer the panel's output so that the panel is continually charging the batteries and the batteries are driving the motor.

How do I wire it?

Could someone direct me to a wiring chart? or describe it? Any pointers are welcome.

I'm not trying to go fast or far. It is only a demo project for my students.

i would have used a solar charge controller with a couple 12v sla to save complicated wiring

Similar questions have been asked before.
Amberwolf posted this search result to help someone else,...it should help you too.
https://endless-sphere.com/forums/search.php?keywords=solar+charg*&terms=all&author=&sc=1&sf=titleonly&sk=t&sd=d&sr=topics&st=0&ch=300&t=0&submit=Search