What the spec sheet says vs. what we actually got.
Eight years, one ProMaster, two power stations, real climates. Every number below is from gear we owned and ran — not a launch-week press kit.
Rule of the house: a measured charge time and a spec charge time are not the same promise.
How we label every figure on this page — order of trust is measured → spec → reported → estimate:
Measured tested firsthand on our own unit · Spec manufacturer-stated · Estimate calculated from known inputs · How we test →
Recharge speed — wall outlet
The single number that decides whether a cloudy week wrecks you. Going from the Yeti to the Elite turned a full-day charge into a lunch break.
Battery longevity — cycle life vs. real life
Rated cycles are a lab number. Here's what the road did to them.
| What we ran | Spec / claim | What we measured | Conditions | Source |
|---|---|---|---|---|
| Goal Zero Yeti 1400 (NMC) | Spec ~500 cycles rated | Measured ~7 years full-time (2018–Nov 2025); gradual fade, then a sharp drop after 8 months in storage. Eventually zeroed out on an induction burner. | Daily cycling, all climates. Maintained at 30–80% during the storage stretch and still lost real capacity. | Yeti 1400 review |
| BLUETTI Elite 200 V2 (LiFePO4) | Spec 6,000+ cycles rated | Measured in progress — owned since Black Friday 2025. We won't fake a number we haven't lived yet. | Daily driver since the Yeti retired. We'll update this row as the years stack up. | Elite 200 V2 review |
Cold weather — the number nobody puts on the box
A spec sheet won't tell you the battery quits before you do.
| What we ran | Spec / claim | What we measured | Conditions | Source |
|---|---|---|---|---|
| Goal Zero Yeti 1400 (NMC) | Spec lithium low-temp charge cutoff | Measured won't accept a charge once internal temp drops near freezing — solar controller just sits there in full sun. Dead until warmed 6–24 hr indoors. | Two to three Colorado winters. Van interior dropped below freezing overnight; we hauled the unit into a Lakewood house to thaw. | Cold weather killed my charging |
Fridge draw & solar harvest
The two figures every "how many watt-hours do I need" calculator gets wrong because they use rated numbers, not lived ones.
Solar: what we ran vs. what we'd run today
The calibration step that fixed both our stations
Both the Yeti 1400 and the Elite 200 V2 drifted on their battery-percentage readout. The fix is the same on almost any station, and it’s the first thing we do with a new unit: run a full 100% → 0% → 100% calibration cycle with nothing plugged in during the drain and the recharge. Do it the day you unbox.