Solis is our most-installed string inverter brand across the Midlands — for new installs where the customer wants reliable quality without paying a brand premium, and for inverter replacements on systems where the original Solis is being upgraded to a hybrid model.
The S5-GR1P range (single-phase residential) covers 1kW to 6kW in 0.5kW increments. The S5-GR3P range (three-phase) covers 3kW to 15kW. The Solis Hybrid range adds battery compatibility, supporting BYD and Pylontech batteries among others.
Reliability data is strong — Solis has held a Tier-1 reliability rating from PV Evolution Labs for multiple consecutive years. Our own field data across 500+ Solis installs in the Midlands shows lifetime failure rate of under 2% over 5 years, in line with the brand's published figures.
Where we don't recommend Solis: if you want the absolute slickest app experience, Fox-ESS edges it. If you want US-style production warranties, Enphase microinverters offer 25-year coverage. But for most domestic Midlands installs, Solis is the sensible default.
Pricing
Inverter only £450-£1,200. Installed as part of a full solar system from £6,500.
Best for
New solar installs where reliability and price matter more than premium-tier features. Inverter replacements on 10+ year-old systems.