About

Site	Japan Solar & Battery Calculator
Operator	Jitty
What it does	Free tool estimating output and economics of home solar and batteries in Japan from public data
Contact	(coming soon)

This site does not sell, install or quote solar or battery systems and is not produced by the government or a utility.

Data used

• JMA climate normals (1991–2020): global radiation and temperature
• METI FY2026 purchase prices and surcharge
• Procurement Price Calculation Committee, 110th meeting (system and O&M costs)
• METI stationary battery cost trends