Why use Li-ion battery packs for solar systems?

 

Rechargeable Li-ion for Renewable Energy
“The change to Li-ion is faster than the advancement of the Internet.”

battery cells

battery cells

Li-ion is less expensive per cycle with longer life than lead acid
No sulfation problem if battery is not fully charged
Potential for rapid charging solutions

Although It is higher in initial purchase price, the cost per cycle of Li-ion is cheaper than lead acid. Li-ion is superior to lead acid in size, weight and service life, reducing shipping cost.

Lead Acid                               Li-ion
Lifespan         500 cycles at 50% DoD          1900 cycles at 90% DoD
Battery cost    $21,000                                 $57,000
Cycle cost      $42                                         $30

 

rechargeable lithium ion battery pack

rechargeable lithium ion battery pack

Replacing Solar system with Li-ion battery packs .
Li-ion batteries with loading capabilities of 1000A can be economically built using 18650 26650 cells in a 4S50P configuration (4 in series, 50 in parallel). Li-ion has a different charge algorithm than lead acid it replaces and some modification may be needed.