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The following are some examples of a quick way to determine the solar power required to MAINTAIN A BATTERY running a 40L Engel fridge in varying circumstances.
If we take a typical situation of approx 6 hours of useable sunlight during the day (remember, direct sunlight - no cloud cover), a 50 watt solar
panel and a 40L Engel fridge (that uses 2.2 Amps per hour):
The formula we will use is:
1/ WATTS ÷ VOLTS = AMPS
2/ AMPS - 10% = USEABLE AMPS
3/ USEABLE AMPS X SUNLIGHT TIME
= TOTAL AMPS SUPPLY IN A GIVEN TIME
1/ 50 WATTS ÷ 12 VOLTS = 4.1 AMPS
2/ 4.1 AMPS - 10% = 3.6 USEABLE AMPS
3/ 3.6 AMPS X 6 HOURS = 21.6 AMPS in 24 HOURS
EXAMPLE 1
This means the fridge could run for 10 hours using a total of 22 Amps.
EXAMPLE 2
If we take a typical situation of approx 10 hours of useable sunlight during the day, a 60 watt solar panel and a 40L Engel fridge (that uses
2.2 Amps per hour):
1/ 60 WATTS ÷ 12 VOLTS = 5 AMPS
2/ 5 AMPS - 10% = 4.5 USEABLE AMPS
3/ 4.5 AMPS X 10 HOURS = 45 AMPS in 24 HOURS
This means the fridge could run for 20 hours using a total of 44 Amps.
If we take a typical situation of approx 6 hours of useable sunlight during the day (remember, direct sunlight - no cloud cover), a 50 watt solar
panel and a 40L Engel fridge (that uses 2.2 Amps per hour):
The formula we will use is:
1/ WATTS ÷ VOLTS = AMPS
2/ AMPS - 10% = USEABLE AMPS
3/ USEABLE AMPS X SUNLIGHT TIME
= TOTAL AMPS SUPPLY IN A GIVEN TIME
1/ 50 WATTS ÷ 12 VOLTS = 4.1 AMPS
2/ 4.1 AMPS - 10% = 3.6 USEABLE AMPS
3/ 3.6 AMPS X 6 HOURS = 21.6 AMPS in 24 HOURS
EXAMPLE 1
This means the fridge could run for 10 hours using a total of 22 Amps.
EXAMPLE 2
If we take a typical situation of approx 10 hours of useable sunlight during the day, a 60 watt solar panel and a 40L Engel fridge (that uses
2.2 Amps per hour):
1/ 60 WATTS ÷ 12 VOLTS = 5 AMPS
2/ 5 AMPS - 10% = 4.5 USEABLE AMPS
3/ 4.5 AMPS X 10 HOURS = 45 AMPS in 24 HOURS
This means the fridge could run for 20 hours using a total of 44 Amps.
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