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How to use solar with a home backup battery

Solar does not replace a full charge from the wall before a forecast outage. It extends day two if the sky actually clears. Size the panel to the battery you own.

1. Charge from the wall first Every system on this site can refill from AC. Do that 24–48 hours before a named storm. Solar is plan B after the weather passes.
2. Read the host’s voltage window, not the panel’s marketing watts EcoFlow DELTA 3: 11–60 V, 500 W. DELTA 3 Plus: two 500 W ports. DELTA 3 Ultra Plus: up to 1,600 W PV. Anker C2000 Gen 2: 11–60 V, 800 W. F3000: 2,400 W dual input. F3800: 2,400 W. F3800 Plus: 3,200 W (11–165 V). AC200L: 1,200 W. Exceeding voltage is how ports die.
3. Prefer the brand’s own folding panel the first time EcoFlow 400 W lists $549 / $649. Anker sells 400 W kits next to F-series units. Bluetti lists 200 W and 350 W bundles on the AC200L page. Third-party panels work only if you own the adapter and the math.
4. Aim, keep it dry, and expect less than the sticker A 400 W folding panel in real weather is often a 1–2 kWh day — enough to offset a fridge, not a heat pump. IP ratings on the panel do not make the battery waterproof. Keep the station itself out of rain.
5. Do not feed rooftop solar into a portable during an outage unless the maker says so Anker’s F3800 Plus FAQ says you cannot recharge from rooftop solar through the Home Power Panel during an outage — connect 11–165 V panels directly. Ultra X + SHP3 is a different, documented path.

ECOFLOW

400 W folding panel · $549 / $649

The panel we can cite with a dated EcoFlow US price.

Check 400 W panel

ANKER

F3800 Plus + 400 W kits

Plus is the Anker unit that actually drinks 3,200 W of solar.

Check F3800 Plus

SMALLER ECOFLOW

DELTA 3 Plus if solar is the point

Same 1 kWh as DELTA 3, but two 500 W solar ports.

Check DELTA 3 Plus

BLUETTI

AC200L solar bundles

US page lists 200 W and 350 W kits. 1,200 W solar ceiling.

Check AC200L