Choosing the Right Solar Inverter: String vs Hybrid
Understand the practical differences between string and hybrid solar inverters so you can specify the right unit for every install.
The decision you're actually making
Every solar install boils down to the same question: what do you want the system to do when the sun isn't shining?
A string inverter converts DC from your panels into grid-ready AC. Simple, efficient, and cheap. But the moment the grid drops, the inverter drops with it.
A hybrid inverter adds battery integration. It stores surplus generation, releases it when pricing is high, and — with the right battery — keeps critical loads running through a power cut.
When string wins
- Pure FIT/SEG export installs where the customer has no battery interest
- Budget-constrained projects where ROI is tightly modelled against export income
- Simple domestic PV with predictable consumption patterns
Fox ESS S Series and Growatt MIN TL-X units consistently deliver 98%+ efficiency at this price point.
When hybrid wins
- Any install where battery is already on the quote, or likely within 2 years
- Commercial sites with time-of-use tariffs
- Customers who specifically ask about power cuts
The Growatt MIN TL-XH range is designed for retrofit: run it string-only today, clip in a battery six months later.
A cheaper rule of thumb
If the end client has asked a single question about resilience or time-of-use pricing, quote hybrid. The additional £150-£250 pays for itself the first time the grid drops, or the first time they look at their electricity bill in January.