Outage backup is the use case where the spec sheet meets reality fastest. A 4-hour neighborhood outage during a summer storm is the median event in most EU/US grids — long enough that your fridge will start losing temperature, short enough that a generator is overkill. The right PPS for this scenario: at least 1500 Wh LFP, 1800W+ continuous AC output, UPS-style transfer for the appliances on it, and a high-power AC charging mode so you can refill it overnight when the grid returns.
The sizing math for the typical 4-hour blackout: fridge 150W avg × 4h = 600 Wh, router + modem 25W × 4h = 100 Wh, two laptops 60W × 4h = 240 Wh, four LED bulbs 30W × 4h = 120 Wh. Total ~1100 Wh — comfortably within a 1500 Wh station's 85% usable capacity. For the rarer 24-hour outage, you'd need a 5-6 kWh station OR an expandable 2 kWh primary + 1 expansion battery. The compare table is filtered to ≥ 1500 Wh and ranks by AC continuous output.
UPS passthrough — the unit acting as a pass-through between wall and appliances, instantly switching to battery when grid drops — is the feature that makes blackout backup actually useful. Without it, the unit sits charged in the closet and you only remember it after the lights go out. Bluetti AC180/AC200/AC500 all advertise <30ms transfer; Jackery Explorer Plus models do too; EcoFlow Delta 2 / Delta Pro have 30ms grid-to-battery transition. Older Jackery Pro models don't have UPS at all.
No models match this use case yet — the catalog is still growing.