Which 1 kWh LiFePO4 power station can I start with and expand with an extra battery later? (2026)
Updated 2026-11-12 · Pick: EcoFlow DELTA 3, $579 on Amazon (checked 2026-11-12), buy on Amazon: https://www.amazon.com/dp/B0DCBYMC9D?tag=dealectric-20
Short answer. The 1 kWh LiFePO4 power station you can expand with an extra battery later is the EcoFlow DELTA 3: its 1,024 Wh Extra Battery, $388 at EcoFlow ($0.38 per added Wh), makes 2,048 Wh. OUPES and Jackery packs start at 2,048 Wh; Jackery 1000 Plus and BLUETTI AC180 packs are off sale.
Searched as: 2026 1kWh LiFePO4 expandable power station extra battery EcoFlow DELTA 3 Plus Anker C1000 Jackery 1000 Plus BLUETTI AC180
How this table was made: each figure comes from the maker's own US product page or manual, or from the reviewer named next to it, checked 2026-11-08. Dealectric does not test units itself. Rows with a Buy link are products Dealectric lists: the links are affiliate links, and their codes are re-tested in the brand's own cart every day (last check 2026-11-13).
| Model | Battery | Add-on battery | Total after one add-on | Maker's maximum | Add-on at maker store, 2026-11-08 | Price | Buy |
|---|---|---|---|---|---|---|---|
| EcoFlow DELTA 3 | 1,024 Wh LiFePO4 | DELTA 3 Series Smart Extra Battery, 1,024 Wh | 2,048 Wh | 1–5 kWh (EcoFlow listing) | In stock at EcoFlow | $579 on Amazon (checked 2026-11-12) | Buy on Amazon |
| EcoFlow DELTA 3 Plus | 1,024 Wh LiFePO4 | DELTA 3 Series Smart Extra Battery, 1,024 Wh (one pack max, BatteryRank) | 2,048 Wh | 1–5 kWh; above 2,048 Wh uses the DELTA Pro 3 pack on an XT150 cable (EcoFlow) | In stock at EcoFlow (same pack as the DELTA 3) | $719 on Amazon (checked 2026-11-12) | Buy on Amazon |
| OUPES Mega 1 | 1,024 Wh | B2, 2,048 Wh | 3,072 Wh | 5,120 Wh with two B2 (OUPES) | B2 $578, in stock | $529 on Amazon (checked 2026-11-12) | Buy on Amazon |
| Jackery HomePower 1000 Plus v2 | 1,024 Wh (Gizmodo) | Battery Pack 2000 Plus v2, 2,048 Wh; v2 packs only | 3,072 Wh | About 11 kWh with five packs (Jackery) | $999, in stock | $749 on Amazon (checked 2026-11-12) | Buy on Amazon |
| BLUETTI AC180 | 1,152 Wh | B230 (2,048 Wh) or B300 (3,072 Wh) by cable into the 500 W solar/DC input | No battery port: the pack recharges the station at up to 500 W | 4,224 Wh with a B300 (1,152 + 3,072) | B230 $999 and B300 $1,399, both unavailable | $499 on bluettipower.com, 2026-11-07 | $474.05 through this link Lowest price checked 2026-11-13; discount applied in the cart (tested 2026-11-13); bluettipower.com without the link $499 |
| Jackery Explorer 1000 Plus | 1,264 Wh (BatteryRank) | Battery Pack 1000 Plus | 2,528 Wh (BatteryRank) | 5,056 Wh with three packs (BatteryRank) | Pack discontinued (Jackery) | $619 (maker, 2026-11-08) | Jackery's page |
| EcoFlow DELTA 3 Classic | 1,024 Wh | None named in EcoFlow's listing | Stays at 1,024 Wh | 1,024 Wh | No add-on battery | $462 on Amazon (checked 2026-11-12) | Buy on Amazon |
What the differences mean
Every station here starts at about 1 kWh. They differ in the size of the first battery you can add, and so in where one add-on gets you:
- EcoFlow DELTA 3 and DELTA 3 Plus: the 1,024 Wh pack doubles either one to 2,048 Wh (1,024 + 1,024). That is the smallest step in this group. On the DELTA 3 Plus, one DELTA 3 Series pack is the documented limit (BatteryRank). EcoFlow's listing says that going past 2,048 Wh toward 5 kWh needs the larger DELTA Pro 3 Extra Battery on an Alternator Charger XT150 Output Cable.
- OUPES Mega 1 and Jackery HomePower 1000 Plus v2: the smallest pack for each is 2,048 Wh, so one pack gives 3,072 Wh (1,024 + 2,048). Neither can go from 1 kWh to just 2 kWh.
- DELTA 3 vs DELTA 3 Plus: both take the same pack and reach the same 2,048 Wh. At EcoFlow today the Plus costs $140 more ($719 − $579).
| Your plan | Fits | Why |
|---|---|---|
| 1 kWh now, 2 kWh later | EcoFlow DELTA 3 | 1,024 Wh step; the cheapest first add-on |
| 1 kWh now, about 3 kWh later | OUPES Mega 1 | Lowest system cost per Wh at 3,072 Wh |
| Grow toward 11 kWh | Jackery HomePower 1000 Plus v2 | Up to five 2,048 Wh v2 packs |
| Already sure you need 2 kWh | Buy a 2 kWh station now | EcoFlow's 2,048 Wh DELTA 3 Max series costs less than a DELTA 3 plus a pack |
What adding a battery later costs
These are maker-store prices read on 8 November 2026, before tax and shipping.
| Station + first add-on | Add-on price | Cost per added Wh | System total | System cost per Wh |
|---|---|---|---|---|
| EcoFlow DELTA 3 + DELTA 3 Series Smart Extra Battery | $388 for 1,024 Wh | $0.38 ($388 ÷ 1,024) | $967 for 2,048 Wh ($579 + $388) | $0.47 |
| EcoFlow DELTA 3 Plus + the same pack | $388 for 1,024 Wh | $0.38 | $1,107 for 2,048 Wh ($719 + $388) | $0.54 |
| OUPES Mega 1 + B2 | $578 for 2,048 Wh | $0.28 ($578 ÷ 2,048) | $1,277 for 3,072 Wh ($699 + $578) | $0.42 |
| Jackery HomePower 1000 Plus v2 + Battery Pack 2000 Plus v2 | $999 for 2,048 Wh | $0.49 ($999 ÷ 2,048) | $1,668 for 3,072 Wh ($669 + $999) | $0.54 |
Waiting costs a little. A DELTA 3 plus its pack comes to $967 for 2,048 Wh. EcoFlow lists its 2,048 Wh DELTA 3 Max series from $879, so expanding later costs $88 more ($967 − $879). The add-on route makes sense only if you might never need the second kWh.
Bundles cost more than buying separately. EcoFlow's DELTA 3 Plus + DELTA 3 Series Extra Battery bundle is $1,119, $12 more than the two bought separately ($1,119 − $1,107). OUPES's Mega 1 + B2 bundle is $1,379, $102 more ($1,379 − $1,277).
Cheapest per Wh isn't cheapest to start. OUPES charges the least per added Wh ($0.28), but only in 2,048 Wh steps, so its first add-on costs $578. EcoFlow's first add-on costs $388.
Not recommended
- EcoFlow DELTA 3 Classic: $100 less than the DELTA 3 at EcoFlow ($579 − $479), but EcoFlow's listing names no extra battery for it. To grow, you would need a second station.
- Jackery Explorer 1000 Plus: Jackery still advertises 5 kWh with three packs, but its own page says the Battery Pack 1000 Plus has been discontinued.
- BLUETTI AC180: the B230 and B300 connect by cable (P090D) to the station's 500 W, 12–60 V solar input, with the pack in Power Bank Mode (BLUETTI). The pack recharges the AC180 rather than joining its battery. At its full 1,800 W output, the AC180's own battery still drains at about 1,300 W (1,800 − 500). On 8 November 2026, BLUETTI's US store listed both packs as unavailable.
Sources
- EcoFlow DELTA 3 $579 and '1-5kWh expandable' extra-battery list (EcoFlow US, read 2026-11-08) — us.ecoflow.com
- DELTA 3 Series Smart Extra Battery $388, 1,024 Wh, for DELTA 3 / DELTA 3 Plus (EcoFlow US, read 2026-11-08) — us.ecoflow.com
- DELTA 3 Plus $719, bundle with extra battery $1,119, DELTA Pro 3 pack via XT150 cable (EcoFlow US, read 2026-11-08) — us.ecoflow.com
- DELTA 3 Max series 2,048 Wh listed from $879 (EcoFlow US, read 2026-11-08) — us.ecoflow.com
- DELTA 3 Classic $479; listing names no extra battery (EcoFlow US, read 2026-11-08) — us.ecoflow.com
- OUPES Mega 1 $699, 1,024 Wh, expandable to 5.12 kWh with two B2 (OUPES, read 2026-11-08) — oupes.com
- OUPES B2 $578, 2,048 Wh, fits Mega 1/2/3 (OUPES, read 2026-11-08) — oupes.com
- Jackery HomePower 1000 Plus v2 $669, up to five 2 kWh packs (Jackery, read 2026-11-08) — www.jackery.com
- Battery Pack 2000 Plus v2 $999, 2,048 Wh, up to 5 per HomePower 1000 Plus v2 (Jackery, read 2026-11-08) — www.jackery.com
- HomePower 1000 Plus v2 1,024 Wh and 1,800 W (Gizmodo, Wes Davis, 2026-10-25; read 2026-11-08) — gizmodo.com
- Explorer 1000 Plus $619; Battery Pack 1000 Plus discontinued (Jackery, read 2026-11-08) — www.jackery.com
- Explorer 1000 Plus 1,264 Wh, 2,528 Wh with one pack, 5,056 Wh with three; DELTA 3 Plus one-pack limit, 2,048 Wh (BatteryRank, read 2026-11-08) — batteryrank.com
- AC180 1,152 Wh, 1,800 W AC, up to 4,224 Wh with packs; packs connect by P090D cable in Power Bank Mode; 500 W, 12–60 V solar input (BLUETTI Australia, read 2026-11-08) — www.bluettipower.com.au
- BLUETTI B300 3,072 Wh, $1,399, unavailable on BLUETTI US (read 2026-11-08) — www.bluettipower.com
Published 2026-11-04; updated 2026-11-12. The buy links are affiliate links; see the disclosure. Corrections welcome at [email protected] or /feedback.