PORTABLEENERGYLAB.COM
Calculators
Quick planning calculators for portable power stations: runtime, solar charging, charging time, and capacity conversion.
Runtime
Runtime Planner
Estimate runtime from battery capacity (Wh) and total load (W). Includes usable fraction (DoD) and conversion efficiency.
Usable energy
— Wh
Estimated runtime
—
Tip: For longer runtime, prioritize low-watt essentials and stagger high loads.
Read capacity sizing guide →
Solar
Solar Charging Planner
Estimate how much energy you can harvest per day from solar and how long it takes to add the energy you need. (Planning estimate only.)
Energy to add
— Wh
Estimated solar harvest / day
— Wh/day
Estimated time
—
(≈ — sun-hours)
Real results depend heavily on sunlight, shading, temperature, and input limits.
Learn solar charging basics →
Charge
Charging Time Estimator
Estimate charging time from energy to add (Wh) and charger input (W). Use this for wall/car/solar input planning (high-level estimate).
Energy to add
— Wh
Estimated charge time
—
Charging often slows near 80–100% (taper), so real time can be longer.
Charging methods explained →
Convert
Capacity Converter
Convert mAh/Ah at a given voltage into Wh and see a simple equivalent at 12V. (Useful for power banks and battery specs.)
Energy
— Wh
Equivalent at 12V (rough)
— Ah @ 12V
Note: Device output conversion reduces usable energy in practice.
Battery safety basics →