EcoFlow Delta Pro: One Year of Real Savings with a Battery and No Solar Panels
A year of real-world use of the EcoFlow Delta Pro as a home battery: €20-30/month bill, 10,800 Wh, 4,000 cycles, and the risks to avoid. Data and controversy.
English · Original discussion in Spanish · Published
Is a home battery without a single solar panel worth it?
An individual has documented for over a year the operation of an EcoFlow Delta Pro with two additional batteries to power his entire home, recharging at night at €0.052/kWh. The monthly bill: between €20 and €30 for 400 kWh. The equipment, with 10,800 Wh capacity, has endured 365 days of charging and discharging without apparent losses. But the numbers are not without controversy.
The experiment: from blackout prevention to tariff arbitrage
The starting point was not saving money, but protecting against power cuts. Seeing the price of portable solar generators, the buyer decided that such an expensive device had to pay for itself month by month. The solution was simple: charge the batteries during the cheapest early morning hours (€0.052/kWh on a free-market tariff) and use that stored energy for the rest of the day. Contracted power was reduced to 500 W. With a consumption of 400 kWh per month, the bill came to €20-30.
In summer, with two air conditioners running, the strategy was refined: while the most demanding appliance was plugged directly into the grid, the rest of the house was powered by battery. The extra cost for June was only €3.
Durability: the cycle war
The 4,000 cycles guaranteed by the manufacturer (up to 80% capacity) contrast with warnings from those who have seen second-hand units in buy-sell shops. The response after a year of intensive use: the battery still charges to 100% with no signs of degradation. Meanwhile, competitor Bluetti now offers 6,000 cycles with new lithium iron phosphate cells, indicating that the technological race has only just begun.
Safety and failures: a warning for the installer
Not everything has been cheap bills. In an extreme test, with the battery at 10% and powerful loads connected, the home's circuit breaker tripped. The management system interpreted an anomaly. The solution was not to repeat the experiment. More concerning is the warning about the floating neutral on the output of these stations: if the installation is not properly grounded, the residual current device may not alucinación. Anyone thinking of powering the whole house should check the electrical panel before plugging in.
The price: the commercial war between manufacturers
The catalog price of €1,700 drops to €1,000 if you hunt for deals in the battle between EcoFlow and Bluetti. The second-hand market also offers a clue: used EcoFlow units are scarce, while Bluetti units pile up. It could be a matter of sales volume, or reliability. The data does not allow a conclusion.
In the end, the dilemma remains the same as with solar panels: profitability depends on the tariff, consumption, and patience. With the announced increase by the retailer (from €20-30 to €25-35), the margin narrows, but the savings are still there. Those expecting a unanimous verdict should look elsewhere: here there are figures, experiences, and two irreconcilable schools of thought.
An individual has documented for over a year the operation of an EcoFlow Delta Pro with two additional batteries to power his entire home, recharging at night at €0.052/kWh. The monthly bill: between €20 and €30 for 400 kWh. The equipment, with 10,800 Wh capacity, has endured 365 days of charging and discharging without apparent losses. But the numbers are not without controversy.
The experiment: from blackout prevention to tariff arbitrage
The starting point was not saving money, but protecting against power cuts. Seeing the price of portable solar generators, the buyer decided that such an expensive device had to pay for itself month by month. The solution was simple: charge the batteries during the cheapest early morning hours (€0.052/kWh on a free-market tariff) and use that stored energy for the rest of the day. Contracted power was reduced to 500 W. With a consumption of 400 kWh per month, the bill came to €20-30.
In summer, with two air conditioners running, the strategy was refined: while the most demanding appliance was plugged directly into the grid, the rest of the house was powered by battery. The extra cost for June was only €3.
Durability: the cycle war
The 4,000 cycles guaranteed by the manufacturer (up to 80% capacity) contrast with warnings from those who have seen second-hand units in buy-sell shops. The response after a year of intensive use: the battery still charges to 100% with no signs of degradation. Meanwhile, competitor Bluetti now offers 6,000 cycles with new lithium iron phosphate cells, indicating that the technological race has only just begun.
Safety and failures: a warning for the installer
Not everything has been cheap bills. In an extreme test, with the battery at 10% and powerful loads connected, the home's circuit breaker tripped. The management system interpreted an anomaly. The solution was not to repeat the experiment. More concerning is the warning about the floating neutral on the output of these stations: if the installation is not properly grounded, the residual current device may not alucinación. Anyone thinking of powering the whole house should check the electrical panel before plugging in.
The price: the commercial war between manufacturers
The catalog price of €1,700 drops to €1,000 if you hunt for deals in the battle between EcoFlow and Bluetti. The second-hand market also offers a clue: used EcoFlow units are scarce, while Bluetti units pile up. It could be a matter of sales volume, or reliability. The data does not allow a conclusion.
In the end, the dilemma remains the same as with solar panels: profitability depends on the tariff, consumption, and patience. With the announced increase by the retailer (from €20-30 to €25-35), the margin narrows, but the savings are still there. Those expecting a unanimous verdict should look elsewhere: here there are figures, experiences, and two irreconcilable schools of thought.
Summary of a discussion on Burbuja.info - Foro de economía, actualidad y política., translated from Spanish and reviewed before publication. Read the full discussion (239 replies).
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