EcoFlow STREAM 5000: 5kWh Battery Model Preview
The EcoFlow STREAM 5000 adds a 5kWh battery to the plug-in solar system. Here's what we know about specs and UK pricing.
What Is the STREAM 5000?
The EcoFlow STREAM 5000 is a premium variant of the STREAM plug-in solar system that includes a 5kWh LFP battery for whole-home energy storage. It's designed for households that want to maximise self-consumption by storing daytime solar generation for evening use.
Key Specifications
| Spec | STREAM 5000 |
|---|---|
| Solar input | Up to 2000W DC |
| AC output | 800VA / 3.5A (UK limit) |
| Battery | 5kWh LFP (lithium iron phosphate) |
| Battery cycles | 3,000+ (to 80% capacity) |
| Battery lifespan | 10+ years |
| Smart scheduling | Yes, via EcoFlow app |
| Weight (battery unit) | ~45kg |
UK Compliance Question
The big question is whether the STREAM 5000 can be sold as a certified plug-in microgenerator under the UK's Interim Product Specification.
The IPS v2 prohibits batteries in the plug circuit. However, the STREAM 5000's battery operates on the DC side — it stores energy from the panels and the inverter manages what flows through the plug. Whether this architecture satisfies the IPS v2 requirements is pending certification.
If it doesn't qualify as a plug-in microgenerator, EcoFlow may sell the STREAM 5000 as a separate home battery system that works alongside a STREAM plug-in solar kit but requires professional installation for the battery component.
Expected Pricing
Based on European pricing and the standard STREAM kit cost:
| Configuration | Expected UK Price |
|---|---|
| STREAM 5000 (full system) | ~£2,500–3,000 |
| Battery unit only (add-on) | ~£1,800–2,200 |
Is a 5kWh Battery Worth It for Plug-In Solar?
With an 800W system generating roughly 2-4 kWh per day (depending on season and location), a 5kWh battery can store most of a day's generation. This lets you:
- Use solar power in the evening when rates are highest
- Run battery arbitrage on time-of-use tariffs
- Cover overnight base load from stored solar
- Reduce grid imports to near-zero on sunny days
However, the economics depend on your tariff. At the Ofgem cap (24.5p/kWh), the additional savings from a battery are roughly £50-80/year compared to solar without battery — giving a payback period of 20-30+ years for the battery alone.
The battery makes more financial sense on time-of-use tariffs like Octopus Agile or Octopus Go, where you can charge at 7p/kWh overnight and avoid 35p+ peak rates.
- 800W dual-panel plug-in solar kit
- 600Wh battery with smart scheduling
- App monitoring with real-time generation data
- Balcony, garden & flat-roof mounts available
Who Is It For?
The STREAM 5000 makes sense if you:
- Want maximum energy independence
- Are on a time-of-use tariff that rewards load shifting
- Plan to add more solar capacity in future (the battery can serve a larger system)
- Value having power during grid outages (depending on configuration)
For most households on flat-rate tariffs, the standard STREAM 800W kit without the large battery offers the best value.
Can the STREAM 5000 provide power during a blackout?
This depends on the configuration. If the battery feeds through the plug circuit, anti-islanding protection would disconnect it during a grid outage. EPS (Emergency Power Supply) mode may be available through a separate output, but this isn't confirmed for the UK version.
How does it compare to a Tesla Powerwall?
The Powerwall (13.5kWh, ~£8,000 installed) is designed for full rooftop solar systems. The STREAM 5000 is a fraction of the cost and capacity but pairs specifically with plug-in solar. They serve different markets.
Related reading
See how much plug-in solar could save you — with real data for your postcode.