Guides and real-world cases
Step-by-step tutorials and worked cases. Every number comes from our calculators.
Worked case1.5 HP Well Pump 200 Feet Away: Wire Size at 240 VA new house on acreage gets a drilled well. The 1.5 hp submersible pump will hang 120 feet down the casing, and the wellhead is 80 feet from the house panel, so the motor sits at the end of 200 feet of copper.
Worked case12V 100Ah Lithium Battery: How Long Will It Run a Fridge?
Worked case200 Amp Service: What Size Wire, Copper or Aluminum?
Worked case24,000 BTU Mini Split: Breaker and Wire Size
Worked case27 kW Tankless Water Heater: Breakers and Wire Size
Worked case30 Amp RV Hookup 100 Feet Away: What Size Wire?
Worked case48-Amp EV Charger 100 ft From the Panel: Wire and Breaker
Worked case50 Amp RV Outlet: Wire Size and Breaker by Distance
Worked case60 Amp Subpanel in a Garage 150 Feet Away: Wire Size
Worked caseBathroom Exhaust Fan CFM: How to Size It
Worked caseCold-Climate Heat Pump Size for a 2,000 sq ft House
Worked caseConcrete for a 12x12 Patio: Cubic Yards and Bags
Worked caseConcrete for Fence Posts: How Many Bags per Post?
Worked caseElectric Dryer 30 Amp Circuit: Wire Size and Receptacle
Worked caseElectric Range 50 Amp Circuit: What Size Wire?
Worked caseHot Tub on 50 Amp GFCI, 75 Feet Away: Wire Size
Worked caseHow Long Will a 13.5 kWh Battery Run My House?
Worked caseHow Many kWh Does an EV Use per Month?
Worked caseHow Many Solar Panels for 1,000 kWh a Month?
Worked caseHow Much Paint for a 12x14 Room? Gallons Worked Out
Worked casehp to kW: Converting Motor Horsepower (and Amps)
Worked caseWhat Size Inverter Do I Need for a Sump Pump?
Worked caseIs 400 Watts of Solar Enough for an RV?
Worked caseLevel 1 EV Charging at 120 V: How Many Hours?
Worked caseMPPT Charge Controller Size for a 48 V Battery Bank
Worked caseNEMA 14-50 Outlet vs Hardwired 40 A EV Charger
Worked casepsi to bar: Tire and Air Compressor Pressures
Worked caseWater Heater Size for a Family of 4: Gallons and FHR
Worked caseWhat Size AC for a 1,500 sq ft House? Tons Worked Out
Worked caseWhat Size Whole-House Generator Do I Need?
Worked caseWindow AC Amps: Can It Share a 15 A Circuit?