Enter your postcode, tariff and usage. We model your local solar yield month by month, size a battery against it, and rank real plug-in solar kits by payback time — not marketing copy.
Every field pre-fills with a sensible UK default so you can see a result immediately — then refine it with your real numbers for an accurate figure.
Defaults to 10-year net saving per £1 spent (highest first) — use "Show" and "Sort by" below to filter to solar-only, battery-only, or full kits, and reorder by whichever matters most to you.
Pick any mix of batteries and panels — the totals and savings update live using the same model as the ranked list above, so you can compare your own combination on equal terms.
Plug-in solar (panels only, no battery) gets a simplified legal route from 27 August 2026, capped at 800W of inverter output. Battery-inclusive kits like the EcoFlow STREAM Ultra and Ultra X aren't covered by that simplification — they're bought and connected via the existing route, which normally means notifying your electricity network operator under G98. See our full explainer on the 2026 rule change for the detail.
EcoFlow STREAM kits on this site range from around £449 for a panels-only microinverter bundle up to roughly £2,400 for a STREAM Ultra X with 4×500W panels, before any discount. Use the calculator above to see current direct and Amazon pricing side by side for every combination.
Across the kits on this site, payback typically lands somewhere between 3 and 7 years, depending on your tariff, how much of your usage overlaps with daylight hours, and whether you're using a battery to shift demand away from peak pricing. Panels-only kits with no battery tend to pay back more slowly, since without storage you can only use power the moment it's generated.
For anything beyond a simple, compliant panels-only device under the new 800W rules, yes — a qualified electrician's input is the safe and normally required route, particularly for battery-inclusive kits, which also need a G98 notification to your electricity network operator before they export. This isn't legal advice; check your specific situation before connecting anything.
It varies by kit and changes over time as both retailers run sales. Our comparison list shows both prices for every product we've matched, and highlights whichever is currently cheaper — so it's worth checking on the day rather than assuming one retailer is always better.
The STREAM Ultra holds 1.92kWh of usable storage; the Ultra X doubles that to 3.84kWh. Both accept up to 2,000W of solar input through the same microinverter, so the choice mainly comes down to how much you want to store for evening and overnight use — the calculator above will size this against your own usage.