8
Use the following equations to calculate your power needs:
Amp Hours (Ah) = Current (Amps) x Working Time (Hours).
Watts (W) = Current (Amps) x Voltage (V).
Remaining Battery Amp Hours (Ah) = Battery Capacity - Usage + Solar input.
With this configuration and a 100Ah battery, an 80W system with 8 hours of good
sunlight would give you 1 day of power (100Ah - 87.41Ah + 32Ah = 44.59Ah)
depleting the battery by 55.41Ah per day. A 160W system would comfortably
run the above for about 5 days (100Ah - 87.41Ah + 71.12Ah = 83.71Ah)
depleting the battery by 16.29Ah per day. The 240W system would be able to run
indefinitely as it will fully charge the battery each day.
This is only a guideline as many factors can influence the amount of charge, for
example less sunlight hours during winter, overcast days etc. will all lower the
amount of power generated by the solar panels. It is recommended to never fully
discharge your batteries, as this can cause permanent damage to the cells.
CHOOSING THE CORRECT SYSTEM
SYSTEM
WATTS
MAX AMPS
HOURS OF SUNLIGHT
AMP HOURS
TDR15005
80W
4A
8h
32Ah
TDR15006
120W
8.89A
8h
71.12Ah
12V RADIO
240W
13.3A
8h
106.4Ah
APPLIANCE
QUANTITY
WATTS
VOLTS
AMP
HOURS OF USE
AMP HOURS
FRIDGE
1
36W
12V
3A
24h
72Ah
LED LIGHTS
4
3W
12V
0.25A
5h
1.25Ah
RADIO
1
18W
12V
1.5A
5h
7.5Ah
TELEVISION
1
40W
12V
3.33A
2h
6.66Ah
TOTAL USE
87.41Ah
Choosing the Correct System
