Practical, data-backed guides to generator sizing, maintenance and running costs — compiled from the manufacturer documents behind this site.
Real generator service intervals from 51,203 records: change oil and oil filter every ~500 h or yearly, plus fuel/air filters and daily checks.
Real per-model generator fuel consumption: diesel gph and lph at 25/50/75/100% load by kW size, plus the runtime formula (tank ÷ gph) with examples.
Add up your running watts, add the biggest motor's starting surge, then add 20–25%. Real generator picks by kW size band, from RV to industrial.