Home backup batteries and transfer switch basics
Affiliate links. Disclosure
Checked: 2026-10-25. This is general background, not installation instructions. Connecting anything to your home wiring must be done by a licensed electrician, following local codes and permits.
Why a transfer switch or inlet matters
Ready.gov's generator advice is to connect appliances with heavy-duty extension cords. Feeding a house panel requires a proper transfer device so your backup source cannot feed the grid. Manufacturers sell or support these devices for their home-backup units:
- EcoFlow DELTA Pro 3: supports EcoFlow Smart Home Panel 2 (up to 3 units, 20 ms switch-over, up to 12 circuits), an Inlet Box via the NEMA L14-30R outlet, or a Manual Transfer Switch. EcoFlow notes Smart Home Panel 2 "requires installation before use".
- Anker SOLIX F3800 Plus: connects to Anker's Home Power Panel, a Transfer Switch or an Inlet Box. The page offers a Home Power Panel installation service.
- Jackery Explorer 5000 Plus: Jackery's product page lists a Smart Transfer Switch option covering up to 12 circuits at 120 V or 6 at 240 V (5040 Wh LiFePO4, 7200 W continuous, 14400 W surge, 120/240 V, NEMA L14-30R/14-50 outlet). Some bundles on that page showed "Sold Out" on 2026-10-25, so check availability on the page.
Pinned home-backup units
| Spec | EcoFlow DELTA Pro 3 | Anker SOLIX F3800 Plus |
|---|---|---|
| Capacity | 4096 Wh | 3,840 Wh |
| Expansion | 12 kWh per unit (2 extra batteries); system up to 48 kWh | Up to 6 expansion batteries (3.84 kWh each); up to 53.8 kWh |
| Continuous AC | 4000 W (6000 W X-Boost) | 6000 W max |
| Surge | 8000 W | Not published as a single figure on the pages or user guide we checked |
| Voltage | 120/240 V | 120/240 V |
| 240 V outlet | NEMA L14-30R (16.7 A), NEMA 6-20R | NEMA L14-30R (25 A) |
| Solar | 2600 W total | 3,200 W (2 × 1600 W) |
| Weight | 51.5 kg (113.54 lb) | 136.7 lb |
| Chemistry / cycles | LFP, 4000 to 80% | LFP, 3,000+ |
Planning checklist before calling an electrician
- List the circuits you want backed up (fridge, furnace blower, well pump, lights).
- Check whether you need 240 V (well pumps and central AC often do; check the appliance label).
- Compare starting watts with the unit's surge spec.
- Decide: manual transfer switch, inlet box, or the brand's smart panel.
- Ask about permits and local code. Do not back-feed through an outlet. OSHA's portable generator guidance says never to attach a generator directly to a building's electrical system unless a qualified electrician has installed it with a transfer switch, because back-feeding "can energize wiring systems for great distances" and risks electrocuting utility workers. The same principle is why the manufacturers above route home connections through a panel, transfer switch or inlet.
Affiliate placeholder: EcoFlow via Impact (no program active, no link) Affiliate placeholder: Anker SOLIX via Impact (no program active, no link)
Sources
- EcoFlow DELTA Pro 3: https://us.ecoflow.com/products/delta-pro-3-portable-power-station (checked 2026-10-25)
- Anker SOLIX F3800 Plus: https://www.ankersolix.com/products/f3800 (checked 2026-10-25)
- Anker SOLIX F3800 Plus user guide (A1790P): https://support.ankersolix.com/s/article/Anker-SOLIX-F3800-Plus-Portable-Power-Station-User-Guide-A1790P (checked 2026-10-25)
- Jackery Explorer 5000 Plus: https://www.jackery.com/products/jackery-explorer-5000-plus (checked 2026-10-25)
- OSHA, Using Portable Generators Safely: https://www.osha.gov/sites/default/files/publications/OSHA3286.pdf (checked 2026-10-25)
- Ready.gov Power Outages: https://www.ready.gov/power-outages (checked 2026-10-25)
Fact-check list
- ☑ DELTA Pro 3 and F3800 Plus specs from spec pages
- ☐ F3800 Plus surge: no single wattage on Anker's product page or user guide; table says so. (An Anker-authored technical brief hosted on a retailer site gives overload time limits, not a surge wattage; not used.)
- ☑ Jackery Explorer 5000 Plus specs and Smart Transfer Switch from the Jackery product page; availability flagged as variable
- ☑ Electrician / local code warning present at top
- ☑ Back-feed warning sourced to OSHA publication 3286