Which EcoFlow solar generator gives the most battery for the money?
The DELTA 3 Ultra Series ranks #1 of 4 on value, at 2.28 Wh/$ for 3072 Wh of battery. EcoFlow sells it for $1,349.00. The DELTA 2 Max comes in at #2 of 4 with 1.99 Wh/$, and it costs $1,029.00.
Third place goes to the DELTA 3 Max Plus at 1.78 Wh/$ and $1,149.00. Last is the DELTA 3 Max (Detachable Wheels), ranked #4 of 4 at 1.58 Wh/$. This ranking says nothing about weight, ports or how fast the battery refills.
Every model here uses LFP battery cells, and each one is listed with 5 years of warranty.
| Product | Best current price | Watt-hours per dollar | Value rank |
|---|---|---|---|
 EcoFlow DELTA 3 Ultra Series | $1,349.00 at EcoFlow | 2.28 Wh/$ | #1 of 4 |
 EcoFlow DELTA 2 Max | $1,029.00 at EcoFlow | 1.99 Wh/$ | #2 of 4 |
 EcoFlow DELTA 3 Max Plus | $1,149.00 at EcoFlow | 1.78 Wh/$ | #3 of 4 |
 EcoFlow DELTA 3 Max (Detachable Wheels) | $1,299.00 at EcoFlow | 1.58 Wh/$ | #4 of 4 |
What does the DELTA 3 Ultra Series offer on paper?
On paper, the DELTA 3 Ultra Series is rated for 3600 W of continuous AC output and a surge of 7200 W, with 3072 Wh of battery. The DELTA 3 Ultra Series rating of 3600 W is the highest here, next to 3000 W for the DELTA 3 Max Plus and 2400 W for both the DELTA 2 Max and the DELTA 3 Max (Detachable Wheels). Motors and pumps pull extra power for a moment when they start.
So check the surge rating as well as the running watts of the things you plan to plug in. The DELTA 3 Ultra Series measures 24.6 in tall, 15.6 in long and 12.9 in wide. At 72.1 lb it sits in the heavy (over 50 lb) class.
Solar comes in through 2 ports with xt60i plugs, rated for up to 800 W. At that input, the fastest full solar refill is 3.8 hours. Pass-through use is listed as yes, and the UPS switchover is listed at 10 ms at most.
The warranty is 5 years, that is 3 years as standard, plus 2 more when you register it in the EcoFlow app.
Strengths
- Large-load output: 2000 W or more of continuous AC output
- UPS switchover speed: 20 ms or less
Gaps
- Weight class: heavy (over 50 lb)
- Charging in freezing weather: does not charge below 0 °C
What ports come on the DELTA 2 Max?
The DELTA 2 Max has 6 AC outlets, 4 USB-A ports, 2 USB-C ports and 1 car port. App control over Wi-Fi and Bluetooth is listed as yes. More outlets can mean fewer power strips.
Its battery holds 2048 Wh, and EcoFlow lists a surge rating of 4800 W. This model can add batteries. For solar, it is rated for up to 1000 W across 2 ports.
Its solar limits are set per_input: up to 60 V and 15 A on each input. The fastest full solar refill at that rate is 2.0 hours. It weighs 50.7 lb, which puts it in the heavy (over 50 lb) class, and measures 19.6 in long, 9.5 in wide and 12 in tall.
The UPS switchover is listed at 20 ms.
Strengths
- Large-load output: 2000 W or more of continuous AC output
- UPS switchover speed: 20 ms or less
- Battery expansion: can add batteries
Gaps
- Weight class: heavy (over 50 lb)
- Charging in freezing weather: does not charge below 0 °C
How fast does the DELTA 3 Max Plus charge from the wall?
EcoFlow lists a partial AC charge time of 64 minutes for the DELTA 3 Max Plus. Of the models here, this page has a wall charge time only for the DELTA 3 Max Plus. The battery holds 2048 Wh, and the inverter is rated for 3000 W of continuous AC output with a surge of 6000 W.
Solar input is rated up to 1000 W over 2 ports, with limits that apply per_input. Each input is listed at up to 60 V and 18 A. With that much solar, the fastest full refill is 2.0 hours.
A quick wall charge helps when a storm is on the way and the battery is low. It weighs 48.7 lb, and it can add batteries. Pass-through charging is listed as yes.
Strengths
- Large-load output: 2000 W or more of continuous AC output
- Battery expansion: can add batteries
Gaps
- Charging in freezing weather: does not charge below 0 °C
How heavy is the DELTA 3 Max (Detachable Wheels)?
The DELTA 3 Max (Detachable Wheels) weighs 44.8 lb, the lowest weight listed here, next to 48.7 lb for the DELTA 3 Max Plus, 50.7 lb for the DELTA 2 Max and 72.1 lb for the DELTA 3 Ultra Series. It holds 2048 Wh and is rated for 2400 W of continuous AC output, with a 4800 W surge. Solar input tops out at 500 W, the lowest of the group, against 800 W on the DELTA 3 Ultra Series and 1000 W on the DELTA 2 Max and DELTA 3 Max Plus.
That gives a fastest full solar refill of 4.1 hours. At $1,299.00, it ranks #4 of 4 on value with 1.58 Wh/$. A lighter unit is easier to lift into a car or carry up stairs.
Pass-through charging is listed as yes for it.
Strengths
- Large-load output: 2000 W or more of continuous AC output
Which of these models can charge in freezing weather?
None of the models with a listed figure charges below freezing: the DELTA 3 Ultra Series, DELTA 2 Max and DELTA 3 Max Plus each does not charge below 0 °C. This page has no charging temperature for the DELTA 3 Max (Detachable Wheels).
For running loads, each model here is rated from -10 °C up to 45 °C. If a battery lives in a cold garage, plan to charge it somewhere warm.
How should you choose between these EcoFlow models?
Start with the largest load you plan to run, and match it to the continuous rating. Then think about where the unit will live and how often you will need to move it. If you plan to rely on solar, the solar input rating sets the fastest refill from panels.
Check the outlet types against the plugs you use most. Last, compare the value figures to see how much battery each dollar buys.