Customer with a string inverter and an AC-coupled battery If you were an early adopter of solar between April 2010 and March 2019 , you are currently benefiting from the most generous green energy incentive in UK history. But as your original inverter approaches its 10th or 15th birthday, you might be facing a dilemma: Repair or Upgrade? At Quantum, we are seeing a massive surge in "Solar Doctor" calls from homeowners in Bridgend and Cowbridge  whose original inverters are fa