Battery Bank Calculator Estimate the battery capacity required based on daily energy use, autonomy days, system voltage and chemistry. Open Energy
Solar System Sizer Size your off-grid solar system based on loads, sun hours, autonomy and voltage. Open Energy
Heating Needs Calculator Estimate required heating power (kW/BTU·h) and daily energy, plus rough wood/propane usage based on area, insulation, ΔT and infiltration. Open Heating
Rainwater Harvesting Estimate annual collectible rainwater, daily coverage, and suggested tank size. Open Water
Water Tower Pressure Calculate static water pressure from tank height (head) and convert between kPa, bar and PSI. Open Water
