Solar & Off-Grid

Array sizing, battery banks, charge controllers, inverters and generators.

• Generator Size Calculator Size a generator from running watts and starting surge, with the fuel it will burn per hour.
• Inverter Size Calculator Size an inverter from your running load and the surge of the largest motor, with the DC current it will draw.
• Off-Grid Battery Bank Calculator Battery bank size for an off-grid system — usable capacity, days of autonomy, depth of discharge and temperature derating.
• Solar Charge Controller Calculator Size an MPPT or PWM charge controller — output current, safety margin, and the maximum array the controller can take.
• Solar Panel Calculator How much solar you need — array size in kW, how many panels, and what it will generate over a year.
• Solar String Sizing Calculator How many panels can go in series — with the cold-weather voltage rise that decides the real limit.