Panasonic Solar Cells Handbook, Page 41 August 1998
SOLAR CELL DESIGN - CONTINUED
2. Selection of Solar cell and Battery
1) Calculation of average current consumption
per day
1
R
=1.67 x 2
= 3.34 (Ah/day)
Equipment operating voltage V
L
=12V
Equipment current consumption I
L
=20W/12V=1.67A
Equipment operating time T=2h/day
2. Selection of Solar Cell and Battery
2) Calculation of operating current required from
solar cell
3) Calculation of storage battery capacity
4) Calculation of solar cell operating voltage
On the basis of the above, the most appropriate solar cell model is:
the solar module BP-HK36K (Vp=16.7V, Ip=1.44A)
the most appropriate storage battery is: the sealed lead-acid battery LS-90-6E(12V, 90Ah)
* Number of non-illumination backup days: 20
(Set at 7-30 days, taking into account equipment
performance)
* Solar cell average rated output generation time
per day: 3.21 hours
C= = 83.5(Ah)
3.34 x 20
0.8
I
P
= = 1.29(A)
3.34
0.85 x 0.95 x 3.21
VP = 14.5 + 0.4 + 0.5 + 1.3 = 16.7V
Storage battery charging voltage
Load
Conditions
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