A kit for radiotelephones has the following feature:
1) reception Consumption: 0.5 amps
2) Consumption Transmission: 9 amps
3) Working voltage: 12 V
The equipment works in reception mode, 24 hours a day and throughout the year. About 120 daily Call Ringtone, a median time of 3 min duration each, except Saturdays and Sundays, which are carried out almost no calls are carried out. Autonomy is required to keep the equipment is 20 days, using a battery self-discharge of 4.5% per month, according to the manufacturer. The panels have been chosen have a nominal power of 20 W. How many panels and batteries should be installed?
Assume 5 hours of peak sunshine.
Efficiency 75% battery.
Depth of discharge for the battery is 80%