American company Enphase is world market leader in microinverters. Compared to regular string inverters, micro-inverters have the advantage that they provide higher yield in shade. Enphase's microinverters have undergone millions of hours of testing and have a very low failure rate of 0.051%. The IQ7 series has an even lower failure rate. Micro-inverters are made for roofs with shade and make a PV system safe due to the low DC voltage. Solarclarity supplies the IQ7A and IQ7PLUS, both with a 25-year warranty.