Under $500, the catalog is dominated by 200-700 Wh LiFePO4 units. The cheapest legitimate stations start around $150 (Bluetti AC2A, Jackery Explorer 100 Plus) for a 200-300 Wh unit that handles a phone or laptop charge cycle and not much else. The sweet spot is $300-400, where you get 500-700 Wh of LFP — enough for a fridge for 5-8 hours, a CPAP for 1.5-2 nights, or a laptop for 2-3 working days.
Watch the chemistry tag on the table below. Some Li-ion holdouts (older Bluetti EB lineups, Jackery Explorer 240/290 first-gen) still appear in this price band. They're cheaper at retail but the 500-cycle rating means you'll see meaningful capacity drop after 2 years of weekly use, versus 8-10 years on the equivalent LFP. The price-per-Wh-per-cycle math always favours LFP at this tier.
AC output is the second filter to apply. A 300W AC station tops out at running a small fridge (180W) or a laptop (60W), but a hairdryer (1500W) trips the inverter immediately. Sub-$500 stations rarely deliver more than 600W continuous — match that to your worst-case appliance load. The compare table sorts by Wh-per-dollar by default; tap 'AC out ↓' if continuous output matters more than total energy.
No models match this use case yet — the catalog is still growing.