Dear Isabel, if you allow me to make some observations. The inverter equipment floods the markets with promises of huge energy savings. Marketing is responsible for exaggerating the benefits of the product. IF they save but in the best case it is 30%. Repairing them when the warranty has expired is more expensive and delayed due to the difficulty of getting the parts. They are more expensive compared to conventional equipment. And my suggestion, with post-use cleaning in addition to regular maintenance, its conventional equipment lasts years of service. Its technical server in industrial electronics dedicated to repair white line is what he has been able to verify in the course of his work. As in medicine, accept a second and third opinion, to make a decision. A pleasure to collaborate. Regards.