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Anker SOLIX F3800
6 kW / 3.84 kWh portable. Best first buy for 240 V essentials.
- Energy
- 3.84 kWh
- Output
- 6,000 W · 120/240 V
- Surge (mfr.)
- 9,000 W
- Chemistry
- LFP
- Warranty
- 5 years (Anker page)
- Price snapshot
- $1,799–$2,000
Updated August 18, 2026 · Manufacturer list prices
Best home battery backup systems in 2026
Two categories, on purpose. Order-online systems can ship without a Tesla-certified queue. Installer-only systems are often the better built-in appliance. Mixing them in one “best” list without saying so is how review sites mislead people.
Federal 30% credit is not in these numbers
Section 25D does not apply to homeowner-owned property placed in service after December 31, 2025. Prices below are hardware list or typical installed ranges with no 30% subtracted. Sources.
Quick picks
Order online
Best cart whole-home
EcoFlow Ultra X
12 kW / 12 kWh start. $7,999 hardware bundle; $10,999 with SHP3 (EcoFlow US, Aug 2026).
Order online
Best portable 240 V
Anker F3800
6 kW / 3.84 kWh. $1,799–$2,000 on Anker’s site.
Order online
Best high-output stack
BLUETTI EP900
9 kW inverter + B500 modules. Confirm live kit price.
Installer · usually $0 affiliate
Best integrated appliance
Tesla Powerwall 3
13.5 kWh, 11.5 kW, 185 LRA, LFP, 10-year warranty.
Comparison (published specs)
| System | Path | Energy | Continuous power | Chemistry | Warranty (maker) | Price snapshot (Aug 2026) |
|---|---|---|---|---|---|---|
| Tesla Powerwall 3 | Installer | 13.5 kWh | 11.5 kW · 185 LRA | LFP | 10 years | Hardware often ~$8k–$10k; installed commonly $11k–$16k+ before local work |
| EcoFlow DELTA Pro Ultra X | Cart + optional EcoFlow install | 12 kWh start (2× ~6 kWh); to 180 kWh | 12 kW (to 36 kW paralleled) | LFP | EcoFlow lists 5-year on the Ultra X product page — confirm at checkout | $7,999 / $10,999 with SHP3 / $13,999 24 kWh+SHP3 |
| EcoFlow DELTA Pro 3 | Cart | 4 kWh; expandable | 4 kW (120/240 V) | LFP | Confirm on product page | From $2,799 (was $3,699 list) |
| Anker SOLIX F3800 | Cart | 3.84 kWh; expansion batteries extra | 6,000 W | LFP | 5 years (Anker product page) | $1,799.99 sale / $1,999.99 list |
| BLUETTI EP900 + B500 | Cart / DIY-leaning | ~4.96 kWh per B500; 2–8 packs typical | 9 kW | LFP | Often 10 years on this line — confirm on Bluetti | Kit pricing moves; historically ~$10k–$17k by pack count |
Sources: tesla.com/powerwall and Tesla Energy Library; us.ecoflow.com Ultra X and Delta Pro 3 pages; ankersolix.com/products/f3800; bluettipower.com EP900 materials. Installed Powerwall totals vary by panel, permit, and labor. Get local quotes.
Photo + spec cards
Official packshots (arrows for more angles) and the numbers we can cite. Tesla is not pictured — their site does not publish a scrapeable packshot we can host cleanly.
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EcoFlow DELTA Pro 3
4 kW / 4 kWh expandable portable.
- Energy
- 4 kWh, expandable
- Output
- 4,000 W · 120/240 V
- X-Boost (mfr.)
- up to 6,000 W
- Chemistry
- LFP
- Extra pack
- $1,899
- Price snapshot
- $2,799 sale / $3,699 list
Order online
EcoFlow DELTA Pro Ultra X
12 kW / 12 kWh starter whole-home stack.
- Starter
- 12 kW / 12 kWh
- With SHP3
- $10,999 list
- Scale claim
- to 36 kW / 180 kWh
- Switch
- <20 ms with SHP3
- Chemistry
- LFP
- Warranty on page
- 5 years — confirm checkout
Order online
BLUETTI EP900 + B500
9 kW inverter plus 4.96 kWh modules.
- Inverter
- 9 kW · 120/240 V
- B500 energy
- 4,960 Wh nom. / 4,464 Wh usable
- Typical kit
- 2–4 × B500 (9.9–19.8 kWh)
- Off-grid note
- 7.6 kW with 2 × B500 (Bluetti)
- Chemistry
- LFP
- Warranty
- 10 years (Bluetti page)
Notes on each
You can order this online
EcoFlow DELTA Pro Ultra X
Whole-home class you can order on EcoFlow US
EcoFlow’s own page (checked August 2026) lists a standard bundle as 1 inverter + 2 batteries = 12 kW / 12 kWh for $7,999. Adding Smart Home Panel 3 (32 circuits, <20 ms switch) is $10,999. Four batteries + SHP3 is $13,999 (24 kWh). Extra Ultra-series batteries list at $2,299 (~6 kWh). SHP3 alone lists at $3,099. Scale claims: up to 36 kW / 180 kWh with more inverters and packs. Surge marketing claim: up to 45 kW — treat as a manufacturer figure, not an independent test.
Warranty on that product page is described as 5 years. Some older EcoFlow lines advertised longer terms. Always read the checkout warranty, not a review written last year.
Cart-ready
Anker SOLIX F3800
The portable that can do 240 V well
Anker’s US page lists 3,840 Wh and 6,000 W, LFP, dual-voltage, 5-year warranty. Price snapshot: $1,999.99 list, $1,799.99 sale (August 2026). This is not a wall-mounted Powerwall replacement. It is the unit most people should start with if the job is fridge + well pump attempt + a few 120 V circuits, and they want a refundable box on the garage floor.
Check Anker F3800Cart-ready
EcoFlow DELTA Pro 3
4 kW · 4 kWh · from $2,799
Delta Pro 3 is a portable, not Ultra X. EcoFlow lists 4,000 W, dual 120/240 V, 4 kWh expandable, from $2,799 (sale vs $3,699 list, Aug 2026). Extra Delta Pro 3 batteries list around $1,899. Pairing with Smart Home Panel 2 is a different, older path than Ultra X + SHP3. Do not mix those accessory lines in your head.
Check Delta Pro 3Cart-ready / DIY-leaning
BLUETTI EP900 + B500
9 kW continuous is the reason this exists
EP900 is an inverter. B500 is a ~4.96 kWh LFP module. Two packs ≈ 9.9 kWh; four ≈ 19.8 kWh. 9 kW continuous is in well-pump / small-AC territory that a 3–4 kW portable will not hold. Retail kit prices change; confirm on Bluetti rather than any 2024 screenshot.
Check Bluetti EP900Installer-only
Tesla Powerwall 3
13.5 kWh · 11.5 kW · 185 LRA · LFP
Tesla’s published specs: 13.5 kWh, 11.5 kW continuous on-grid and backup, 185 LRA motor start, seamless transfer, 10-year warranty. US materials commonly state ~70% energy retention at year 10. Chemistry is LFP (Powerwall 2 was NMC). Integrated solar inverter; Tesla documents expansion packs. You generally cannot “add to cart” a permitted whole-home install. We include it because it is the product many readers will be quoted, and pretending EcoFlow is the same appliance would be false.
Tesla Powerwall page (informational)How we would choose in one paragraph
If you want a wall appliance, solar-ready integration, and you will get three installer quotes, start with Powerwall 3 and one non-Tesla bid (FranklinWH / Enphase / EcoFlow install). If you want something that can arrive this month and you will manage loads, start with F3800 or Delta Pro 3 for essentials, or Ultra X + SHP3 if you are ready to spend Powerwall money without waiting on Tesla. If a well pump is non-negotiable, do not buy a 2–4 kW unit and hope — read the pump page.
FAQ
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