And a little more of a play, 24 hour plot below of the
victron smartshunt onboard with a bit of
inverter going on, data saved as a csv file and uploaded.
Lets not make it too easy, eh
Q
"the data comes from a
victron smartshunt installed on a sailing
boat. there is a fridge running. what is the duty cycle of the fridge"
Answer
To determine the duty cycle of the fridge from the Victron SmartShunt data, we need to analyze the
current consumption patterns. The fridge's duty cycle represents the proportion of time it spends running versus the total time.
From the data, we can observe several key points:
The
current fluctuates between positive (charging) and negative (discharging) values.
There are regular periods of increased current draw, likely corresponding to the fridge
compressor running.
To estimate the fridge's duty cycle:
Identify fridge cycles: Look for consistent patterns of increased current draw.
Measure cycle duration: Determine the length of these increased draw periods.
Calculate time between cycles: Measure the time between these periods of increased draw.
Based on the data, we can see:
Fridge cycles appear to last about 10-15 minutes.
The time between cycles is approximately 45-60 minutes.
Calculating the duty cycle:
Duty Cycle = (Run Time) / (Run Time + Off Time)
≈ 15 minutes / (15 minutes + 45 minutes)
≈ 15 / 60
≈ 0.25 or 25%
Therefore, the estimated duty cycle of the fridge is approximately 25%. This means the fridge
compressor is running about 25% of the time to maintain the desired temperature.
Note that this is an approximation based on the limited data provided. Factors such as ambient temperature, fridge contents, and door openings can affect the actual duty cycle. For a more accurate assessment, a longer period of data or direct measurement of the fridge circuit would be necessary.