Here are some videos with technical solar content for contractors. By solar installers for solar installers.

• Intro Solar

Energy 101: Solar Power
Solar power: an introduction
How do Solar cells work?

• Different Types of Systems

Solar Home Basics: On Grid vs Off Grid Solar Panels
Grid-Tie System and Net-metering Explained
How does an On-Grid Solar PV System work?
How does an Off-Grid Solar PV System work?

• Designing a Solar System

Tilt & Mount Angle
How to Size a Solar System
Off-Grid PV System – Block Diagram
On-Grid PV System – Block Diagram
On Grid PV System Component based Block Diagram

• Estimating Solar Cost

How to calculate your solar panel payback
How to Size My Off-Grid Solar System & How Much Does it Cost?
How much do solar panels cost?

• Installation of Panels

How to install solar panels yourself on your roof
Solar Power Installation on Tiled Roof
Mounting PV Array Frames

• Installation of Racking

Unirac Standoff and Rail Assembly
How to Install an IronRidge SGA Solar Ground Mount
Installing Quick Mount PV’s Patented Quick Rack Rail-Free Mounting System

• Installation of Inverters

Enphase IQ7 Micro Inverter Installation for Solar System
How to Install SolarEdge – North America version
Installing the Sunny Boy 5.0-US/6.0-US

• Installation of Batteries

PWRcell Solar + Storage | Generac Clean Energy | Presented By Soligent
Commisioning GENERAC PWRcell system
Tesla Powerwall Installation and Overview
Tesla Powerwall Installation by Sun Dollar Energy

• Monitoring

SunPower Monitoring System
SolarEdge Monitoring Introduction
How to view & use the Enphase Enlighten App

• Charge Controllers

Solar Charge Controller | What is it and How it works in a Solar Power System
MPPT Charge Controllers Explained
Why do we need a Solar Charge Controller?

• Solar Financing

Should I Finance Solar Panels?
Solar Loans Explained
Going Solar Simplified – Cash, Financing, Leases and PPA’s explained

• Solar Incentives

Understanding Solar Incentives
What is the Federal Tax Credit for Solar Energy?

• Becoming a Solar Installer

Careers in Solar: Solar Installer
How to Become a Solar Installation Lead
A Day in the Life of a Solar Installer

• Solar Sales

Careers in Solar: Sales
Synergy Solar Sales Training
Super Saturday Solar Sales Training