A stand-alone pedestrian crossing sign is located in Miami, FL. The sign is lit 24/7 with tiny LED lights located on the perimeter of the sign, which are powered by PV. During the day the PV panel supplies its power to the lights and at the same time it charges the battery. During the night the power for the lights comes from the battery. The lights are ON for 1 sec. and OFF for 2 sec. The designers have recommended the following equipment for lighting the sign: • 1-15W PV panel (17”x14”), Operating voltage: 6V • 1- 6V, 12Ah battery, 75% eff. & maximum depth of discharge 80%. • 8- LED lights operate @ 6V and draw a combined current of 1 amp. Determine if the designers provided the right type of equipment for the sign to perform as required. Assume the winter peak sun hours for Miami are 4. Also, assume 4 days of sunshine and 2 days of no sun, therefore the battery has to store power for 2 days.
A stand-alone pedestrian crossing sign is located in Miami, FL. The sign is lit 24/7 with tiny LED lights located on the perimeter of the sign, which are powered by PV. During the day the PV panel supplies its power to the lights and at the same time it charges the battery. During the night the power for the lights comes from the battery. The lights are ON for 1 sec. and OFF for 2 sec. The designers have recommended the following equipment for lighting the sign:
• 1-15W PV panel (17”x14”), Operating voltage: 6V
• 1- 6V, 12Ah battery, 75% eff. & maximum depth of discharge 80%.
• 8- LED lights operate @ 6V and draw a combined current of 1 amp.
Determine if the designers provided the right type of equipment for the sign to perform as required. Assume the winter peak sun hours for Miami are 4. Also, assume 4 days of sunshine and 2 days of no sun, therefore the battery has to store power for 2 days.
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