The decision in this example: RIVER 3 saves carrying weight, but does not cover the full 320 Wh device plan under our default assumptions. DELTA 3 covers the estimated energy with more weight. This is a comparison of two catalog candidates, not a claim that every laptop needs a 1 kWh battery.
Separate working hours from the planning period
Our editable example uses a laptop averaging 60 W for four total hours and a router at 10 W for eight total hours, within one 24-hour planning period. That is 240 Wh + 80 Wh = 320 Wh of device energy. These are chosen inputs, not typical consumption or measured runtimes.
The separate maximum running-power inputs are 65 W and 10 W: 75 W together. The example assumes no additional starting requirement for either device. Verify that assumption for your own equipment. Include a separate modem, fiber terminal, display or dock if you need it.
We apply the same assumptions to both batteries: a 90% usable charge range, 85% conversion efficiency and 3 W idle use across the full planning period. These are transparent planning choices, not measurements of either product.
- RIVER 3: estimated energy for devices
- 115.42 Wh
- DELTA 3: estimated energy for devices
- 711.36 Wh
- Example device requirement
- 320 Wh
RIVER 3's 300 W normal AC rating exceeds the 75 W load, yet its estimated energy falls short. DELTA 3's energy estimate exceeds the device requirement. Neither result proves adapter compatibility, a measured runtime or uninterrupted operation.
Review any saved plan before replacing it with the example. Your chosen inputs can then follow you into the model profiles.
A shorter plan can change the answer
RIVER 3: consider it when carrying less matters
The US RIVER 3 EFR705 has 245 Wh rated energy and weighs approximately 3.5 kg (7.7 lb). This is the 245 Wh RIVER 3, not RIVER 3 (230), Plus or Max. Its two AC outlets share 300 W; a higher combined-output or X-Boost headline does not change normal AC output.
If you edit the laptop to one hour and the router to three hours, the same illustrative draws total 60 Wh + 30 Wh = 90 Wh. With all other one-day assumptions unchanged, that is below the 115.42 Wh estimate. This shows why your usage can make a compact option worth considering. It does not verify your actual devices or demonstrate a product runtime.
DELTA 3: more energy, more to carry
The US DELTA 3 EF-DL-H10-3 has 1,024 Wh rated energy and weighs approximately 12.5 kg (27.6 lb). Its 1,800 W total continuous AC rating is much higher than this example requires; the additional energy is the relevant difference for longer working sessions.
There are six US AC outlets, all sharing that total output. Two USB-C outputs can provide up to 100 W each, 200 W combined. RIVER 3 has one USB-C output up to 100 W. A compatible USB-C setup may be worth investigating, but this article calculates AC use with the devices' adapters. Do not reuse its efficiency or idle assumptions unchanged for USB/DC operation.
A battery between these two sizes may also suit your own plan. We have not researched every model on the market, and this comparison makes no price or value ranking. Check actual energy needs and a realistic carrying limit before buying more output than you need.
Three checks before treating either as a backup
- Connection and regional version: check the exact US 120 V unit, frequency, outlet arrangement and your adapter requirements. USB-C needs compatible power profiles and cable capacity; a router's DC plug also needs the correct voltage, polarity and connector. Matching watts alone is not enough.
- Low-load behavior: review output timeout and energy-saving settings. A small network load must not be disconnected by an unsuitable setting. We have not measured either product's idle demand or tested its low-load behavior with your equipment.
- Continuity: a powered router cannot guarantee service if other networking equipment or the provider's infrastructure loses power. For automatic transfer, check the documented interruption and each device's tolerance. This guide does not establish UPS suitability or cover medical and other critical loads.
A cooler, refrigerator or other motor adds a starting check. The advertised peak or X-Boost value is not a verified start envelope for that appliance. Our camping and cooler plan shows why unknown startup remains open even when energy is sufficient.
These examples include no recharging, solar harvest, extra battery or connection to home wiring. Follow each manufacturer's temperature, ventilation and operating instructions.
Put your own numbers ahead of the model name
Edit the home example first. Then open a model profile to see its sources and the result for your saved plan. The interactive comparison lets you select RIVER 3 and DELTA 3 side by side.
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EcoFlow RIVER 3 · US 120 V
EcoFlow DELTA 3 · US 120 V
We do not check live prices or availability here. Confirm the exact base unit, electrical region and included accessories at the seller.
Manufacturer sources and calculation
- EcoFlow RIVER 3 official user manual — Specifications, US/BR rows
- EcoFlow DELTA 3 user manual — US examples; solar charging and technical specifications, PDF pp. 16 and 25–27
- EcoFlow US — DELTA 3 product specifications
- ChooseWatt calculation methodThe estimates above come from our calculation model and editable example, not manufacturer appliance-runtime graphics.
The German regional guide compares AC180 and DELTA 3 as DE 230 V models. It uses different regional candidates; these pages do not claim their electrical versions are identical.