Heliora cost model

Fictional product. Every number on this page is illustrative.
Estimated bill
Heliora cost
Surplus refund
Difference

$0 $60 $120 $180 $240 100 450 800 1150 1500 kWh used per month
Estimated utility bill Heliora cost after refund Breakpoint: refund hits $0
Show the exact math