ECOFLOW DELTA 3 Plus vs ECOFLOW RIVER 2 Pro

Our Verdict

For only about £29 more, the DELTA 3 Plus gives you 33% more capacity (1024Wh vs 768Wh) and more than double the continuous output (1800W vs 800W), plus expandability up to 5kWh that the River 2 Pro doesn't offer at all. Unless portability is your top priority, the DELTA 3 Plus is the clearly better value at this price gap — and independent lab testing found the River 2 Pro's real-world usable capacity fell short of its rated 768Wh, which narrows the gap even further in the DELTA 3 Plus's favour.

Which one should you buy?

Home backup and higher-draw appliances: the DELTA 3 Plus's 1800W output (2200-2400W with X-Boost) comfortably covers things the River 2 Pro's 800W (1600W X-Boost) ceiling struggles with, and its expandability to 5kWh future-proofs the purchase if your needs grow.

Independent testing caveat: OutdoorGearLab's lab testing measured the River 2 Pro's usable capacity at roughly 600Wh against its 768Wh rating — about 81% of spec — which is worth knowing since it's not something you'd see on either manufacturer's spec sheet.

Portability and camping: the River 2 Pro is lighter and more compact, and reviewers note it's genuinely backpack/car-boot friendly in a way the larger DELTA 3 Plus isn't — if you specifically need the smallest, lightest option and don't need the extra capacity, it still has a place.

Noise: multiple independent reviews flag the River 2 Pro's fan as loud and inconsistent during charging and high-draw use, which matters if you'd use it near a desk or overnight — this is a real-world usability point that doesn't show up in the spec comparison.