Ham Radio Power & Portable Calculators
Eight power and portable calculators for amateur radio: battery runtime, solar charge time, LiFePO4 vs SLA comparison, watts to dBm, QRP field day power budget, DC voltage drop, fuse rating, and PWM/MPPT solar controller sizing.
Battery Runtime Calculator
Operating time from battery capacity, average current draw, and depth of discharge. Covers LiFePO4, SLA, and NiMH chemistries.
Solar Panel Charge Time Calculator
Time to recharge a battery from solar, accounting for panel output, peak sun hours, charge controller efficiency, and battery state of charge.
LiFePO4 vs SLA Battery Comparison
Side-by-side weight, usable capacity, and cycle life comparison between LiFePO4 and SLA batteries for a given capacity requirement.
Watts / dBm / dBW Converter
Full power unit conversion with reference table. Useful for QRP power budgeting and comparing TX power levels.
QRP / Portable Power Budget Calculator
Full power budget for a portable or Field Day operation: TX power, RX current, accessories, battery requirement, and estimated runtime.
DC Voltage Drop Calculator
Voltage drop and power loss in a DC feed cable. Shows required wire gauge to keep drop below a target percentage.
Fuse and Circuit Breaker Rating Calculator
Recommended fuse size for a given load current and wire gauge. Includes Anderson Powerpole and standard automotive fuse size recommendations.
PWM / MPPT Solar Charge Controller Sizing
Required charge controller current rating for a solar array. Compares PWM and MPPT efficiency for your panel and battery voltage combination.