Enphase microinverters solve several significant limitations inherent with central inverters.
Systems designed with central inverters use strings of panels that must be matched and anything that brings down the output of even a part of one panel brings down the whole string. Panels with microinverters will output according to the amount of sun they receive irrespective of the other panels in the system.
Each inverter employs its own MPPT (maximum power point tracker) which optimizes the power curve according to the current conditions for maximum energy harvest for that individual panel. This results in energy gains of 5 - 25 %. Central inverter strings can only employ MPPT for the entire string. This means that the power curve is optimized at the average of all the panels in the string, lowering the harvest of higher potential panels.
Dust, debris and shading have markedly less impact on overall array harvest. Reduction of insolation only affects the panel(s) that are actually impacted, and even then the enphase MPPT works to optimize the individual cells that have available light.
No single point of failure. Each panel/microinverter is its own power generator unlike central inverters which take the whole system off line when the inverter shuts down.
Enphase "burst mode" offers panel by panel optimization for low light conditions further increasing energy harvest.
Enphase offers the longest inverter warranty in the business. 25 years. Not only is it the longest warranty but they service any necessary warranty work AND pay for any lost production!
Central inverters, with their 10 - 15 years warranties, will have to be replaced at full inverter cost. If a microinverter fails after the warranty expires, only the failed microinverter, at a fraction of the cost of a central inverter, has to be replaced while the others continue to produce.