If you are looking for a high return on investment from your project in the long run, it does not make sense to only look at the purchase cost of an inverter. The initial costs of the whole system, which are heavily influenced by the inverter, combined with the operating costs over its entire service life, are what really make the difference.

For successful PV systems it is worth taking a closer look at the three factors capital expenditures - CAPEX, operating expenditures - OPEX and return on investment.