The day length difference between summer and winter months can be up to 5hrs. To get to some sort of average day length hours we will use 7 hours of available good sunlight for the calculations below. Let us use 275Watt panels in this example. How would 12 of these panels cope? The formula will be 275W panel x 12 panels x 7 hours of sunlight. This gives us 23,100 Watts or 23,1kW. Our need is 33kW as we determined previously. More panels are required. How would 18 of these panels cope? The formula will be 275W panel x 18 panels x 7 hours of sunlight. This gives us 34,650 Watts or 34,6kW. Our need is 33kW as we determined previously. This is a workable solution. Always have solar panels of the same make and model in a particular connected group. If you mix argument’s sake 275W panels with 330W panels, your grouped panels will be limited to 275W at best. You should also end up with panels in even numbers. There are many other factors that needs to be considered. Please read the 1st section named “Solar Panels”.
