Electricity & Energy guides
5 guides — practical answers with the math shown, each paired with a free calculator.
How Many Solar Panels Do I Need? Sizing From Your Real Usage
Daily usage divided by what one kilowatt makes in a day, why sun hours dominate the count, and the wattage trade that saves a tight roof.
July 23, 2026 · 13 min read
How Much Does Heating Cost? By Fuel, Per Month, With Math
The watts-times-hours formula, the $63 default month, why every 1,500 W heater costs the same to run, and where gas and heat pumps land.
July 23, 2026 · 13 min read
How Much Does It Cost to Charge an EV? Home vs Public, Per Mile
The three-line formula, the losses you pay for but never keep, and why home charging beats public by two to four times.
July 23, 2026 · 13 min read
What Size Generator Do I Need? Wattage by Scenario
Running watts plus one surge, times 1.2. The honest tally that gets it right, and the mistake that stalls a generator the moment the compressor kicks in.
July 23, 2026 · 13 min read
How Much Does Electricity Cost? Reading Your Bill in kWh
The kWh formula, the rate your bill actually charges, and what a heater, an always-on device, and standby power really cost.
July 20, 2026 · 6 min read