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EcoFlow DELTA Pro Ultra X EcoFlow DELTA Pro Ultra X The EcoFlow DELTA Pro Ultra is the closest thing on the market to a true whole-home battery backup that does not require professional installation. A single 6 kWh module gives you enough capacity to run a typical American household's essential circuits — fridge, lights, modem, fans, even a small AC unit — for 12 to 24 hours. Stack three modules and integrate the Smart Home Panel 2 and you are looking at 18 kWh of backup at 21.6 kW peak output, which is genuinely competitive with a Tesla Powerwall on capacity terms but with the added flexibility that you can take the modules with you for off-grid use. It is expensive — $5,799 for one module, plus panel and installation costs — but if you are in a hurricane zone, on an unreliable rural grid, or building an off-grid cabin, this is the most capable consumer-grade unit we have tested. Who Should Buy It The DELTA Pro Ultra makes sense if you live in a hurricane region (Florida, Gulf Coast), an unreliable grid area (rural California, Texas), or you are building an off-grid cabin or van life rig where you want the option to scale up to whole-home power without redoing the wiring. It is also a strong fit for medical-equipment-dependent households where outage recovery time matters. Skip it if you have a stable grid, no medical needs, and your "backup" requirement is just keeping the fridge cold for a few hours — buy a DELTA 2 or DELTA Pro 3 instead and save $4,000. Specifications The DELTA Pro Ultra is modular: each module is 6 kWh and 7.2 kW continuous output. You can stack three modules per inverter (18 kWh, 21.6 kW), and run up to five inverters in parallel for 90 kWh and 36 kW. The cells are LiFePO₄ at 3,500 cycles to 80%. Inputs include 5,600 W AC, 5,600 W solar (high-voltage MPPT), generator input, and EV charger input. Outputs cover everything from USB-C PD 100 W up to dual 240 V split-phase for North American homes. What We Like The split-phase 240 V output is the most important spec on the page. Most portable power stations are 120 V only — you cannot run a well pump, an electric oven, an electric dryer, or a heat pump from them. The DELTA Pro Ultra's native 240 V means it actually runs a real home, including the high-draw appliances that smaller units cannot. The Smart Home Panel 2 integration is genuinely seamless. Once installed by an electrician, the panel detects grid loss in 20 ms and switches your selected circuits to the battery automatically. You will not see the lights flicker. This is what people expect from a Tesla Powerwall and it works the same way here, at roughly two-thirds the installed price. Solar input ceiling of 5,600 W per inverter is class-leading. With a real 5 kW rooftop array, you can solar-recharge a depleted module in roughly 90 minutes of full sun. What We Don't It is heavy and large. Each 6 kWh module weighs 116 lb. You are not moving these around without a hand truck and a partner. They live in your garage, basement, or utility room. The cost adds up fast once you include the Smart Home Panel 2 ($1,499) and electrician installation ($2,000–$5,000 depending on local rates and panel complexity). A meaningful three-module install is realistically $20,000–$25,000 all-in. Software is occasionally fussy. We have seen the app lose connection to the panel after firmware updates and need a manual re-pair. EcoFlow's customer service has improved year over year, but expect occasional friction. Real-World Testing We tested a single-module setup with the Smart Home Panel 2 connected to four circuits: kitchen fridge, networking gear, bedroom outlets, and one zone of LED ceiling lights. On a deliberate grid-down test, transfer was instant — the only indication was a quiet click. Total backup runtime under that load profile averaged 18 hours from 100% to 10%. Versus the Tesla Powerwall 3 The Powerwall 3 stores 13.5 kWh per unit at 11.5 kW continuous, all installed and warrantied by Tesla. It is more "set it and forget it." The DELTA Pro Ultra is more flexible — you can take a module to a remote cabin, or to a job site, or for van life — and roughly 30% cheaper installed at comparable capacity. If you never plan to move the battery, Powerwall has a nicer ownership experience. If you want the option to take some of your backup somewhere else, EcoFlow wins. Pricing and Where to Buy Single 6 kWh module: $5,799. Smart Home Panel 2: $1,499. Two-module bundle: typically $10,499 with frequent $1,500–$2,000 discounts during seasonal sales. We have seen the best prices during EcoFlow's October "off-grid season" sale and Black Friday. Final Verdict If you are serious about home energy independence and you have $15,000–$25,000 to spend, the DELTA Pro Ultra is the best modular option in 2026. It is not for everyone — most readers will be better served by a DELTA Pro 3 or DELTA 2 Max — but for the buyer it fits, nothing else on the consumer market combines this much capacity, this much flexibility, and this much output.   EcoFlow DELTA Pro Ultra X Read the full article