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
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