Solar glossary
Energy independence: what it means and why it matters
The share of a building's energy that the solar and battery system supplies on its own.
Why it matters in Nigeria
It answers the question people actually ask: how much of the time can I stop caring about the grid and the generator?
How PureWatts measures it
Median Energy independence (Solar + battery)
med_sc2_energy_independence_pct
Median over the buildings in the group. Medians DO NOT COMBINE — never average these across groups; re-derive from the histograms instead. Share of demand met without the grid.
Solar + battery: PV sized to cover FULL demand including round-trip losses: kwp = min(demand x (daylight + (1-daylight)/0.90) x 1.10 / net_yield, pv_max_kwp); battery = night demand / (0.80 DoD x sqrt(0.90)), capped at 2.0x PV kWp
Sized to LATENT demand — the energy the building would use if it could. Against a cash baseline that only reflects today's spend this looks oversized; that is what sc3 exists to fix.
Median over the buildings in the group. Medians DO NOT COMBINE — never average these across groups; re-derive from the histograms instead.
See these numbers for your area
Every state and local government area page reports energy independence for its own rooftops. Browse the Nigeria rooftop solar data.