Premium Power,
Budget Price.

Two stations can wear the same price tag and store wildly different amounts of energy, so the headline number tells you almost nothing on its own. The honest yardstick is dollars per watt-hour — what you pay for a unit of stored energy. Across the sub-$500 field that figure varies far more than the stickers do. Our two big picks land near the bottom of that range — $0.47/Wh on the DELTA 3 Classic and $0.47/Wh on the AC70.

So why are the SOLIX C300 ($1.49/Wh) and Elite 30 V2 ($1.01/Wh) our value picks despite the worst $/Wh here? Because tiny batteries carry a fixed-cost floor: the case, the BMS, the ports, the screen and (on most) the inverter cost about the same whether you wrap them around 250 Wh or 1,000 Wh. Spread that overhead across fewer watt-hours and the per-Wh price climbs. $/Wh ranks stored energy per dollar honestly — it just can't see how long that energy lasts. That's the next chart's job.

A battery's real cost isn't what you pay once — it's what each kilowatt-hour costs every time you use it. Divide the price by the energy you'll ever pull from it: price ÷ (cycles × kWh × ~0.8 usable). Run the AC70: $359 ÷ (3,000 × 0.768 × 0.8) ≈ $0.19 per delivered kWh. The DELTA 3 Classic lands at ≈ $0.19.

Now take an old NMC-era unit still on shelves — a Jackery Explorer 300 (293 Wh, 800 rated cycles, $289): $289 ÷ (800 × 0.293 × 0.8) ≈ $1.54 per kWh. That is eight times worse than the LiFePO4 units, and it's the entire budget story in one number. A cheap NMC pack isn't cheap electricity — it's the most expensive electricity you can buy. LiFePO4 at 3,000+ cycles is the whole game; a lower sticker on short-cycle chemistry just defers the second purchase.

Stand the AC70 next to a flagship at twice its price and ask what the extra money actually buys. Mostly headroom: 2,000W-plus continuous output and a bigger surge ceiling for hard-starting motors; 140W USB-C instead of 100W; a full recharge in well under an hour; a deeper expansion ecosystem; and a nicer app, screen, and port layout. Real engineering — but headroom you may never touch.

For the loads most budget buyers actually run — phones, lights, a CPAP, a laptop, a router — none of those cuts change your night; a good sub-$500 unit does the job identically. They start to bite the moment you reach for something with a heating element or a big motor: a coffee maker, a microwave, power tools, a space heater, or running several of those at once. Buy for the loads you have, not the flagship spec sheet.

The one budget mistake that costs the most is buying too small and buying twice. Two SOLIX C300s (576 Wh combined) run $859.98; a single AC70 gives you 768 Wh for $359 — more energy, one inverter, one thing to carry, and a lower $/Wh. Doubling up on small units stacks their fixed-cost floors on top of each other.

Size for roughly 125% of your biggest realistic day, so a cold snap or an extra device doesn't leave you dark. If you genuinely can't commit up front, buy into a line that grows: EcoFlow's DELTA 3 — the Classic's pricier sibling — takes a plug-in battery to about 2 kWh, and the RIVER 3 Plus accepts a clip-on pack that doubles it. Nothing on this list expands, the DELTA 3 Classic included, so if growth matters, that is the reason to spend past it. That expansion path — not a second standalone unit — is the honest middle road.