AddressYour roofYour billYour estimate

Your power bill and a battery

48 Hoku Lane, Kailua. We size the system to cover about 90% of what you use.

Your average monthly HECO bill

$310

a month

$50$650

Not sure? Use your latest bill. You can change it on the next step.

BatteryRecommended on Oahu

Solar and one 13.5 kWh battery Stores daytime solar for the evening. Covers evening use for a home like yours, and keeps the lights on in an outage. Solar only Lower price. Power you do not use in the day goes to the grid at a low credit.

How we worked this outHide

Step	Working	Result
Yearly use	$310 / $0.42 per kWh x 12	8,857 kWh
Target	90% of 8,857 kWh	7,971 kWh
Your roof	From Google's Solar API, this layout	1,450 kWh per kW
Panels	7,971 / 1,450 / 0.43 kW = 12.79, rounded up	13 panels
System size	13 x 430 W	5.59 kW

$0.42 per kWh is an example Oahu residential rate. Panels are 430 W. 13 of the 30 that fit, so there is room to add more later.

Your system

13 panels on the sunniest part

Panels: 13 x 430 W
System size: 5.59 kW
Battery: 1 x 13.5 kWh

See my estimate Back to your roof