Trek4Tech
Compare current prices on portable power stations, solar generators, and off-grid tech across top retailers — with runtime math from published specs, not marketing copy.
Portable Power
Start With the Question, Not the Product
Every guide here answers one operator question with a formula and a spec sheet. No hands-on testing is claimed anywhere on this site — each number reconstructs from published specs, a 0.85 inverter factor, and a dated price check. Pick the question.
How many nights will a power station run my CPAP?
Sizing by machine wattage, humidifier on or off, and a nights-per-station table built from rated capacity × 0.85.
CPAP runtime calculatorWhy does my fridge trip a 1000W power station?
Startup surge is 3-10× running watts. Size for the spike, not the nameplate.
Appliance surge sizerCan a power station replace a UPS?
Advertised switchover is 10-30ms depending on model. Routers ride it out; most desktop PCs do not.
Why does my solar generator charge slower than advertised?
MPPT voltage windows, amperage caps, and the 0.65 field factor behind every panel rating.
LiFePO4 or NMC?
The cycle-life spec that decides whether the battery lasts 3 years or 12.
How many solar panels do I need?
The sizing formula, with the planning multiplier that turns rated watts into a realistic daily harvest.
Latest Buying Guides
Runtime math, honest picks, and off-grid power advice
CPAP wattage from manufacturer specs: ResMed AirSense 10 and 11 and AirMini typical and peak draw, Philips and Luna power-supply ratings, and what each number means for battery runtime.
Powering a CPAP through an AC inverter wastes 15-20% of your battery. How DC power paths work, which cords you need, and when AC is still the right call.
Heated humidifiers draw more power than the CPAP motor itself. Turn them off and extend battery runtime 2-3×. Here's the math and how to sleep comfortably anyway.
CPAP runtime comparison by power station: Wh-per-night math for common setups, a nights-per-station table, and how humidifier settings change everything.
Are folding solar panels fragile? Laminate clouding, hinge fatigue, bent-cell damage, and output fade — plus when folding still beats rigid.
Three numbers decide your real panel count: daily watt-hour use, real panel output, and usable sun hours. The recharge math with worked examples.