Battery Pack Building

Champlain Explorer uses 74 hand picked 18650 Li-Ion batteries. These batteries were scavenged from old toy hoverboard battery packs (remember when hoverboards were bursting on fire? Yeah..those batteries -- minus the bad stuff). Each individual cell has been capacity checked and matched to insure equal performance throughout the overall pack. 
The blue circuit board below is the charge controller. This will transfer power from the 2 X 100 watt solar panels into the battery pack and maintain equal voltage levels between each cell.