Using a power quality or data logger like the Mavowatt 210 that captures power output, you can perform your own RENEWABLES & SOLAR audit to help you size your PV array. These unit are used by installers, homeowners, and renewable energy companies to check their photovoltaic installations calculate and compare the actual RENEWABLES & SOLAR input versus the actual output. With units like our Profitest PV and Profitest Sun Memo it is possible to record Solar Irradiance and DC Voltage/DC Current generated by the array, allowing users to check the efficiencies of their solar panels over time.