A Highway sign along 195 near Miami, Florida is powered by a 650 W PV fixed army

Question

A Highway sign along 195 near Miami, Florida is powered by a 650 W PV fixed army that is tilted at latitude +15 degree and facing south. The PV system encompasses a 48 V battery system, a MPPT charge controller, and an inverter with 95% efficiency. If the sign is illuminated for 4 hours per day in December, make reasonable assumptions and determine the power available for lighting. Determine the minimum batter)' system in Ah for 2 days of autonomy for December month. Use the average cool temperature correction factor of 0.9. How much energy will be available in the mouth of June if the sign is to be illuminated 6 hours per day?

Explanation / Answer

This average candle-power is also known as mean spherical candle-power (MSCP).

Mean Hemispherical candle-power (MHSCP): It is given by the total flux emitted in a hemisphere (usually the lower one) divided by the solid angle subtended at the point source by the hemisphere.

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