solar/ engel calculations

Submitted: Friday, Feb 24, 2006 at 14:17
ThreadID: 31114 Views:6588 Replies:9 FollowUps:2
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Im have just rung my local engel dealer to find out the power consumtion of my fridge. I have a Engel SR70F-G4-Gl, 70 litre front door type with freezer.

He reckoned it _Affordable_Storage_Drawers.aspx 2.5A with a 40% duty cycle depending on ambient temp, beer consumption etc. So here goes....

2.5A x 40% = 1A
power consumption = 1A x 12v = 12W
=12Wh/h
=288Wh/day

A 64W solar panel mounted flat (80%) in perth (5.5.peak sun hours)produces :
64 x 0.8 x 5.5 = 281W

The efficiency of a battery is about 80% so usable power is :
281 x 0.8 = 225W

Therefore 2 of these panels would be required to be self sufficient.

The main problem I have is the 40% duty cycle rate for the fridge and would appreciate any information anyone has regarding this number, or experience with actual power usages.

Steve M
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