(checked 2026-10-10)Sample under 1,500 ratings (1,365).
A fast-charging 1 kWh unit (about 50 minutes on AC in OutdoorGearLab's test) that you can expand to 5 kWh, and Amazon owners rate it highly. Only three of its six AC outlets are grounded, and it's heavier and more awkwardly shaped than many 1 kWh rivals.
Top complaints
- Only half the AC outlets are grounded
OutdoorGearLab says just three of the six AC outlets take three-prong plugs.
Source: OutdoorGearLab (Delta 3 review) - Heavy and awkward for its class
28.1 lb, heavier and larger than many 1,000 Wh competitors, with a long, narrow shape that is awkward to store (OutdoorGearLab).
Source: OutdoorGearLab (Delta 3 review) - Middling output score
Power output scored 5.6 of 10, its lowest category in OutdoorGearLab's testing. Performance gets 12 negative mentions on Amazon against 71 positive.
What owners love
- Very fast charging
OutdoorGearLab measured a full charge in about 50 minutes, faster than EcoFlow's advertised 56. Amazon owners say it charges rapidly to 100%.
- Good real capacity and expandable
870 Wh measured out of 1,024 Wh (85%), and it expands to 5 kWh (OutdoorGearLab).
Source: OutdoorGearLab (Delta 3 review) - Owners like the quality
Amazon's summary says it handles induction hobs and refrigerators, with quality mentioned positively 130 times and negatively 5 times.
- Most of your plugs are three-prong
- You want the lightest 1 kWh unit
- You need tight storage space
- Fast recharging between outages
- Starting small and adding batteries later
- Running a fridge or induction hob for a while
Scores (tap for why)
What experts say
- OutdoorGearLab: 6th of 14 (score 67, review 2026-07-23). Fast charging, a readable display and a high surge rating, but half the outlets are ungrounded and it's heavy for its class.