First calculate the total watts required for your equipment. Let’s assume 50W.
Let’s assume your equipment will run 24hrs per day.
50W x 24hrs = 1200Wh ; so each day you are consuming 1200W
Figure out your worst case winter sun in your area; let’s assume it’s 3hrs peak sun per day.
So with 3hrs of sun you need to generate 1200W of power
1200W per day equipment load / 3hrs sun per day = 400W of solar panels*** This is the absolute minimum amount of solar you would require. With solar it’s always a good rule of thumb to add at least 20% additional capacity, so the recommended would be 500W minimum of solar panel capacity to support 50W equipment load with 3hrs of sun per day.