What influences the eWPH?

The main factors that could make a certain solar panel installation perform with better eWPH values than its neighbours could be:

What are (equivalent) Watt Peak Hours?

Equivalent Watt Peak Hours, or eWPH, is the metric that allows us to compare 2 solar panel installations of different sizes. It is defined as daily production (kWh) / Installation capacity (Wp) and has 'hours' as unit.