Grid inverters (also called string inverters) convert the direct current from your solar panels into sinusoidal alternating current synchronised to the 50 Hz grid frequency — for self-consumption or grid injection, without battery storage. In the event of a grid fault or overvoltage, the inverter disconnects automatically (anti-islanding protection). Available in single-phase and three-phase, from 1 to 100 kW, with brands including SMA, SolaX and Sofar Solar. If you're considering storage now or later, go for a hybrid inverter instead.
Your goal: self-consumption or grid injection without a battery → grid inverter. If you want storage (now or later) → hybrid inverter.
Single-phase or three-phase: check your electrical panel. Single-phase for most homes, three-phase for large installations or commercial use.
Power (kW): must match your PV power. Practical rule: inverter = 80 to 110% of panel peak power. Use the solar simulator to validate.
Number of MPPTs: 1 MPPT is enough if all your panels share the same orientation. As soon as you have 2 orientations (east/west, partial shading), go for 2 MPPTs or more.
Grid injection or zero export: depending on your country and grid contract, you can inject surplus power or block it to zero via a CT sensor.
