How Much Does It Cost to Charge an EcoFlow DELTA Pro 3?
Estimate the grid electricity cost to recharge the 4,096Wh EcoFlow DELTA Pro 3 using current EIA residential rates and charging-efficiency assumptions.
The DELTA Pro 3 has 4,096Wh of nominal battery capacity, so a theoretical full grid refill needs more than 4.096kWh from the wall after charging losses.
What matters
- EcoFlow lists 4,096Wh nominal capacity for the DELTA Pro 3.
- At 90% charging efficiency, a 0–100% refill uses about 4.55kWh from the grid.
- Electricity rate matters more than the difference between nearby charging-efficiency assumptions.
- Partial charges should use only the percentage of capacity actually restored.
How to size it
- Convert 4,096Wh to 4.096kWh.
- Divide by charging efficiency.
- Multiply grid kWh by your local electricity rate.
- Use the actual state-of-charge change for partial charging.
At the EIA U.S. YTD residential average of 18.16¢/kWh and 90% efficiency, a theoretical 0–100% refill costs about $0.83. The same method is about $0.55 at North Dakota’s state average and about $2.09 in Hawaii.
Common buying mistakes
- Multiplying 4.096kWh directly by the utility rate without charging losses.
- Using a national electricity rate when your tariff is known.
- Confusing charge cost with total cost of ownership.
Grid energy is a minor ownership cost for a DELTA Pro 3. Purchase price, cycling, warranty and the value of the loads it protects matter far more.
Use your actual tariff when possible
State averages are useful for comparison, but the best charging-cost estimate comes from your own cents-per-kWh rate, the percentage of battery being restored and a realistic charging-efficiency assumption.
Next step
Calculate your charging cost → or Compare recharge cost by state →.