Inverters
Sigenergy SigenStor Energy Controller 3.6kW Hybrid Inverter
Single-phase 3.6kW hybrid inverter with built-in EPS backup and AI-driven scheduling, DC-coupled to Sigenergy's own stackable battery modules.
£941.67 ex VAT
How it scores
Scores based on published manufacturer specifications and weighted criteria — not lab testing. Methodology.
Specifications
- Supply phase
- single
- Hybrid inverter
- Yes
- Max power (kW)
- 3.6
- IP rating
- IP66
- MPPT trackers
- 2
- Backup capable
- Yes
- Warranty
- 10
- AC / DC coupled
- DC
- Battery compatible
- Sigenergy SigenStor BAT (1-6 stackable modules)
- Optimisers required
- No
- Peak efficiency
- 97.6
What I noticed
Sigenergy is a newer entrant (2023-24) building single-box hybrid inverters with proprietary DC-coupled battery modules and AI-assisted scheduling via the mySigen app. The EC-SP 3.6kW is their smallest UK single-phase unit, sized for arrays under 4kW.
Unlike this category's solar-only string inverters, the SigenStor Energy Controller has a built-in battery port and seamless EPS backup — it pairs with Sigenergy's own stackable BAT modules (1-6 units) rather than third-party batteries, so it's a closed ecosystem choice.
Who it suits
Smaller single-phase installs wanting battery-ready hardware and backup power from day one, and who are comfortable committing to Sigenergy's own battery line rather than shopping third-party.
What I'd watch for
Sigenergy is a young brand in the UK market — track record and installer familiarity are still building. Proprietary battery ecosystem means no third-party battery flexibility. Weight and dimensions were not independently confirmed at the time of writing.
Sources — verified 15 July 2026
- Sigenergy, official product page — sigenergy.com
- Quality Heating UK, SigenStor EC-SP 3.6kW retail listing (£1,130 inc VAT, converted to ex-VAT above) — qualityheating.co.uk
SigenStor Energy Controller 3.6kW Hybrid Inverter head-to-heads
Side-by-side scoring vs each alternative in our shortlist.
Other Inverters on my shortlist
Read next
Background reading and decision-tree pages that put this product in context.