By utilizing these two inverters , it is mandatory that protective/safety devices (including fuses/breakers) are installed. Protective devices such as SPDs 
(surge protective devices) are required for both your solar panel input and AC input to this inverter. 

SPDs protect against transient voltage spikes, surges, or electrical disturbances that could permanently damage the inverter. They are required for each PV string at the inputs and for each hot leg at the AC input.