You can build a battery pack from recycled cells from decommissioned rechargeable equipment or even the modern-day hybrid vehicles for instance Nissan E power /Leaf or Outlander (forget about Toyota they use a different battery chemistry which is very hard to work with ).
I have been using such...
If you are planning to go solar in either an off-grid or hybrid system this post will help you understand what you need. Getting everything right from the planning stage will save you a lot of money.
An energy audit is the first stepping stone to building a solar system that supplies your needs...
