UK Fox ESS solar generation stats: June 2026 in review
If you are searching for UK Fox ESS generation stats from a summer month, this post is a full breakdown of what my system produced in June 2026. All figures come directly from Check My Solar.
My system setup
| Component | Detail |
|---|---|
| Inverter | Fox ESS H1 G2 Hybrid |
| Panels | 13× Aiko Neostar 2S 460 W (~5.98 kWp) |
| Storage | Fox ESS EP5 5.18 kWh × 2 (10.36 kWh total) |
| Location | United Kingdom |
| Installed | 23 May 2025 |
Solar generation
June 2026 produced 825.8 kWh, an average of 27.5 kWh/day. That is down from May’s 892.1 kWh (−7.4%), with more cloud and a run of weaker days mid-month before a stronger final week.
Daily generation by week
| Week | Dates | Generation (kWh) |
|---|---|---|
| 1 | 1–7 June | 153.3 |
| 2 | 8–14 June | 174.9 |
| 3 | 15–21 June | 180.8 |
| 4 | 22–28 June | 259.9 |
| 5 | 29–30 June | 56.9 |
Week 4 was the strongest of the month - five days in a row above 34 kWh as high pressure settled in.
Best days
| Date | Generation (kWh) |
|---|---|
| 19 June | 42.6 |
| 13 June | 41.3 |
| 25 June | 38.9 |
| 26 June | 38.9 |
| 22 June | 38.6 |
19 June was the peak day at 42.6 kWh - a clear day where the array covered the full house load from morning onward. The weakest day was 11 June at 8.2 kWh, showing the spread you can get even in high summer.
Grid export
June exported 521.1 kWh, or 63.1% of generation. That is a slightly higher export share than June 2025’s 61.3% - both batteries were close to full most mornings from overnight off-peak charging, leaving little headroom to store solar before it went to the grid.
| Metric | June 2026 |
|---|---|
| Generation | 825.8 kWh |
| Exported | 521.1 kWh |
| Export % of generation | 63.1% |
| Grid import | 246.4 kWh |
| House load | 482.2 kWh |
| Net grid (export − import) | +274.7 kWh |
Battery performance
| Metric | June 2026 |
|---|---|
| Charged | 150.8 kWh |
| Discharged | 149.3 kWh |
| Round-trip efficiency | ~99.0% |
That round-trip figure is unusually high for a single month and mostly reflects rounding over a small cycle total rather than a real efficiency gain - the year-to-date figure sits closer to 95–97%, which is normal for lithium storage. Batteries cycled lightly in June; with generation covering daytime load, most cycling came from off-peak overnight charging and evening peak discharge.
June 2025 vs June 2026
| Metric | June 2025 | June 2026 | Change |
|---|---|---|---|
| Generation (kWh) | 854.2 | 825.8 | −3.3% |
| Export (kWh) | 523.2 | 521.1 | −0.4% |
| Export % | 61.3% | 63.1% | +1.8 pts |
| Charged (kWh) | 137.4 | 150.8 | +9.8% |
| Discharged (kWh) | 143.8 | 149.3 | +3.8% |
| Peak day (kWh) | 39.9 (18 Jun) | 42.6 (19 Jun) | +6.8% |
Generation was down slightly year on year - 2026 had a weaker second week - but the peak day was higher than 2025’s best, and export held almost flat. The extra battery capacity added in November 2025 shows up as higher monthly cycling volume even with marginally lower generation.
Year to date
Through 8 July, 2026 has generated 3,760.5 kWh, exported 2,463.8 kWh, and cycled 1,333.5 kWh into the batteries. That is close to the entire first partial year (May–December 2025: 3,891.8 kWh). June was the third-highest month of the year so far, behind April and May.
Compare your stats on the leaderboard
Check My Solar has a community Leaderboard where Fox ESS owners can opt in and compare production, export, battery metrics, and generation efficiency (kWh per kWp) - globally and by country.
You can see the same numbers behind a public share link:
share.checkmy.solar/v0vc5af8bbbj?period=year&date=2026
Read how leaderboard privacy works before you opt in - only aggregated monthly and yearly totals are shared, never live readings or account details.
Track your own Fox ESS system
If you want a breakdown like this for your install:
- Sign in to Check My Solar and link your Fox ESS inverter
- Open History for daily, monthly, and yearly views with a calendar heatmap for spotting your best and worst days
- Optional: join the Leaderboard and grab your own public share link
Available on the web app and iOS. Questions? Join Discord or follow us on WhatsApp.