Solar Glossary
EV charging terms in plain English. From kWh to NACS, what they mean and why they affect your bill.
ITC (Investment Tax Credit)
The US Federal Investment Tax Credit lets homeowners deduct 30% of solar install costs from federal income taxes. Sectio...
SEG (Smart Export Guarantee)
UK scheme requiring electricity suppliers with 150,000+ customers to pay solar exporters for surplus power. Rates vary b...
STC (Small-scale Technology Certificates)
Australia's solar rebate. Each STC equals about 1 MWh of estimated production over the panel's deeming period. STCs are ...
EEG (Erneuerbare-Energien-Gesetz)
Germany's renewable energy law that sets feed-in tariffs for solar exports. 2026 rate: €0.082 per kWh for systems up to ...
Production Factor
Annual solar production per kW of installed capacity. Phoenix is ~1,800 kWh/kW/year. Seattle is ~1,100. UK averages 950....
Net Metering
Billing arrangement where surplus solar exports are credited at the full retail electricity rate. Most US states still o...
PPA (Power Purchase Agreement)
Contract where a third party owns the solar system and sells the electricity to the homeowner at a fixed per-kWh rate, t...
Panel Degradation
Annual loss of solar panel output. Tier-1 panels degrade 0.4-0.5% per year. After 25 years, output is 80-87% of original...