Solar Grid Tie Micro Inverter 700W 600W 500W 350W 300W MPPT Input DC26V-60V PV Output AC110V/240V Home Solar On Grid System. Within 90 days of receiving the inverter. The inverter does not work. Please contact customer service. Due to a short period of time. Problems with the inverter. If it is inverter problem. We offer you free motherboard replacement. Because there is a possibility of damage due to improper operation or system mismatch. 2: Provide PV system parameters. Panel power how many watts. How many volts of voltage Voc. Series or parallel connection. 3: Provide what color the inverter LEDs are. It is better to record video. We can quickly determine the problem. Our 18-50V grid-tie microinverter requires a starting voltage of 24V and has an operating range of 18V-39V (Vmp). Please note that the Voc of the solar panel should not exceed 50V. It is not recommended to use 12V solar panels with a Vmp of 18-20V and a Voc of 20-24V, because weak sunlight may cause the operating voltage to drop below 18V, causing the inverter to work unstable and be damaged. Instead, we recommend using a solar panel with a Vmp of 30-39V and a Voc of 38-46V for optimal performance. Regarding the heating problem of the inverter. This is normal phenomenon. All electronic devices generate heat during operation. The inverter uses aluminum alloy material. Metal can conduct heat better. The inverter also has over-temperature protection if the temperature is high. Then the inverter will automatically reduce the working output efficiency. After cooling down, restart. It is recommended to install the inverter in a ventilated, dry and cool place. After a large amount of customer data feedback, the inverter cannot work because the DC or AC fuse is damaged. When you encounter this problem, we can send you accessories for free. And give you maintenance video instruction. You can easily replace it. We stand behind our products so you are always covered! Determine the cause of product failure through pictures, videos and text descriptions provided by the customer and remotely guide the customer to troubleshoot the problem.