Specifications

4 - 10 12/16/97
SOLAR/BATTERY CHARGE BUDGET WORKSHEET
CHARGE DRAIN per DAY
Current ON Time DRAIN
(Amps) (min/hour) (min/day) (Amp-min)
A. Station _____ 60 1440 ______
B. AOM or Timer _____ ______ _____ ______
C. Radio on _____ ______ _____ ______
D. Transmit add _____ ______ _____ ______
TOTAL DRAIN/DAY = A + B + C + D = ______ Amp-minutes
CHARGE GAIN per DAY
E. Solar Panel Current @ 1000 W/m
2
_____ Amps
F. Peak Solar Irradiance _____ Watts/m
2
G. Day Length _____ hours
H. Cloud Factor _____
TOTAL GAIN/DAY = E (F/1000) x .55 x 60G x H = _____ Amp-minutes GAIN/DRAIN = ____
SOLAR/BATTERY CHARGE BUDGET Example: GroWeather with Timer and UHF Radio
CHARGE DRAIN per DAY
Current ON Time DRAIN
(Amps) (min/hour) (min/day) (Amp-min)
A. Station 0.018 60 1440 25.9
B. AOM or Timer 0.012 24 0.3
C. Radio on 0.100 24 2.4
D. Transmit add 0.800 6 4.8
TOTAL DRAIN/DAY = A + B + C + D = 33.4 Amp-minutes
CHARGE GAIN per DAY
E. Solar Panel Current @ 1000 W/m2 0.6 Amps
F. Peak Solar Irradiance 1000 Watts/m
2
G. Day Length 10 hours
H. Cloud Factor 0.75
TOTAL GAIN/DAY = E (F/1000) x 0.55 x 60G x H = 148.5 Amp-min. GAIN/DRAIN = 148.5/33.4 = 4.5