The solar calculator
What could your rooftop make possible?
A useful first estimate, with the assumptions in plain sight. Start with what you know and explore from there.
Make it your estimate.
Use your own bill and units where possible. Every assumption is visible.
See the assumptions and calculation
Monthly units = entered kWh, or bill ÷ entered rate if kWh is unknown. Energy yield per kW = 4.5 peak sun hours × 0.78 performance ratio × 30 days = 105.3 kWh/month. Indicative capacity is the lower of demand ÷ yield or space ÷ 100 sq ft per kW, rounded down to 0.1 kW. Savings = the lower of monthly use or generation × self-consumption, multiplied by your assumed rate. Annual figures multiply this representative month by 12 and do not model seasonality.
Location and property type help contextualize an inquiry; they do not change the yield model. System preference does not size batteries. Shading, temperature, orientation, seasonal changes, structural suitability and actual equipment are not modeled. A survey and design can produce different results. Assumption set: 2026-10-planning-v1. A site-specific assessment may use different assumptions.
From a number to a conversation
Let’s add the real-world details.
A site-specific assessment is the next step. Your current inputs will be attached to the inquiry.