A 2014 SunnyBoy inverter had been progressively under-performing since 2022. Three optimisers were also offline.
System size
Existing 4 kWp
Annual saving
£900 generation recovery
Payback
N/A (maintenance work)
Maintain FiT registration (worth £350/year on this system). Like-for-like replacement required, no upgrades that would void contract.
SMA SunnyBoy 4.0 like-for-like swap. Replaced 3 dead Tigo optimisers. Re-registered system with Ofgem (FiT meter unchanged). Cleaned panels under bird mesh.
Generation back up to 4,100 kWh/year (from 3,200). System now carries our 5-year workmanship warranty in addition to inverter's 10-year warranty. FiT contract preserved.
32 kWp
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Free survey, fixed-price quote, written PV*SOL projection.