Portable power and solar generators

Which Power Stations Take an Extra Battery, and How Far Each Brand Lets You Go

Published · By the SolarPanelX editors · Prices and specs as of that date, from the pages under Sources

Summary

Expansion runs from 286 Wh to 53.8 kWh depending on the brand and the base unit. EcoFlow stacks one Extra Battery 300 on a RIVER 3 Plus for 572 Wh, and lists four extra batteries for the DELTA 3 Plus. Jackery's packs are model-specific and it names six stations that accept one. BLUETTI sells the same B300K pack under three listings, one per base unit, at three prices. Anker's F3000 reaches 24 kWh and the F3800 family 53.8 kWh; EcoFlow's DELTA Pro 3 reaches 48 kWh. The catch in every case is compatibility by exact model, not by brand.

Brand by brand

Base unitExpansion packPack capacitySystem maximumNote
EcoFlow RIVER 3 Plus (286 Wh)Extra Battery 300 (EB300)286 Wh572 Whstacks without a cable, per EcoFlow
EcoFlow DELTA 3 Plus (1,024 Wh)DELTA 3, DELTA 2, DELTA 2 Max or DELTA Pro 3 Extra Batteryvaries by packnot stated as one figureall four connect via an Alternator Charger XT150 Output Cable
EcoFlow DELTA Pro 3 (4 kWh)DELTA Pro 3 Extra Batterynot captured48 kWh$4,459 with one extra battery on October 4, 2026
Jackery Explorer 2000 Plus (2,042.8 Wh)Battery Pack 2000 Plus2,042.8 Wh6 kWh bundles were sold as refurbished$799 for the pack on September 23, 2026
Jackery HomePower 2000 Plus v2Battery Pack 2000 Plus v2not capturednot captureda different pack from the one above
BLUETTI Apex 300, AC200L/AC300, AC500B300K2,764.8 Wh (51.2 V, 54 Ah), 29.5 kgnot capturedthree listings, $1,200 / $1,499 / $1,249 on September 23, 2026
Anker SOLIX F3000 (3,072 Wh)BP30003,072 Wh24 kWh240 V needs two units plus a hub
Anker SOLIX F3800 / F3800 Plus (3,840 Wh)BP38003,840 Wh53.8 kWh, up to six batteries and two units

Figures for EcoFlow's RIVER 3 Plus and DELTA Pro 3 are from October 4, 2026; the rest are from our September 23, 2026 readings linked under Sources.

Three things that go wrong

When expansion beats a bigger unit

Expansion keeps the inverter you already own and adds hours; it does not add watts. A DELTA 3 Plus with an extra battery still delivers 1,800 W, and an F3000 with a BP3000 still needs a second F3000 for 240 V. If the problem is a load that will not start, the answer is a larger base unit, not a pack; if the problem is the second night, a pack is the cheaper route.

Shopping for one? Browse portable power stations →

Sources

  1. EcoFlow US — RIVER 3 Max (RIVER 3 Plus + Extra Battery 300)
  2. EcoFlow US — DELTA 3 Plus Portable Power Station
  3. EcoFlow US — DELTA Pro 3 Portable Power Station
  4. Jackery Support — Which models support the battery capacity expansion feature? (updated August 6, 2026)
  5. Jackery — Battery Pack 2000 Plus
  6. BLUETTI — B300K Expansion Battery
  7. BLUETTI — Expansion Battery collection
  8. Anker SOLIX — F3000 Portable Power Station
  9. Anker SOLIX — F3800 Portable Power Station

We have not tested these products. Specs, prices, stock and terms are as published on these pages on the date above and can change; check the manufacturer or retailer before you buy.

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