EcoFlow DELTA Pro Ultra (Home Battery System)
The DELTA Pro Ultra is EcoFlow's attempt to build a whole-home battery system that anyone can install. 6kWh LFP base capacity, expandable to 90kWh, whole-home backup, smart EV charging, and an integrated 7.2kW inverter. It requires professional installation in the UK — but it's designed to make that installation as straightforward as possible. It represents where the consumer solar market is heading.
Pros
- 6kWh LFP base capacity expandable to 90kWh via additional battery packs
- Integrated 7.2kW bidirectional inverter — charges from grid and discharges to home
- Whole-home backup with automatic switchover in under 30ms
- Smart EV charging integration — uses solar surplus to charge EVs
- Compatible with EcoFlow PowerStream ecosystem for panel integration
- Home Assistant integration with full telemetry
Cons
- £4,000–£6,000 for the base system before installation — not consumer pricing
- Requires professional electrical installation in the UK (G98/G99 requirements)
- Heavy and large — dedicated installation space required
- EcoFlow ecosystem lock-in for smart features
- Overkill for the vast majority of UK households evaluating plug-in solar
The EcoFlow DELTA Pro Ultra is where you end up if you buy an EcoFlow STREAM today and come back in five years wanting more. It's the ceiling of the EcoFlow ecosystem — a 6kWh whole-home battery system that actually competes with Powerwall and Sungrow SBR on specification, if not quite on price.
Why it exists
EcoFlow's commercial logic is clear. Get buyers into the ecosystem with a £499 plug-in kit. Build brand loyalty through the app experience. Offer increasingly capable products as their needs grow. The DELTA Pro Ultra is the top of that ladder — the product you buy when you've outgrown plug-in solar and want whole-home integration.
That ladder is the right strategy, and the DELTA Pro Ultra is a credible product at the top of it. The 7.2kW bidirectional inverter handles most UK homes comfortably. The 30ms switchover time for whole-home backup is competitive with Tesla Powerwall. The Home Assistant integration is genuinely capable.
The price reality
At £4,000–£6,000 before installation, the DELTA Pro Ultra competes directly with Sungrow SBR systems and second-generation Powerwalls — both of which have more established UK installer networks and longer track records. The EcoFlow premium here is largely for the brand integration and the consumer-friendly setup experience.
For a household starting from zero with a £5,000 budget, a Pylontech US5000 paired with a Sunsynk hybrid inverter is likely a better technical choice at lower cost. The DELTA Pro Ultra makes most sense for households already in the EcoFlow ecosystem who want a single-vendor upgrade path.
The verdict
The EcoFlow DELTA Pro Ultra is impressive hardware at premium pricing. It's the right product for EcoFlow ecosystem buyers who want whole-home battery capability without switching brands. For everyone else, there are more cost-effective whole-home battery options on the UK market.
