Vent Fan. How Much Power for a Mobile, Marine, or Off-Grid Electrical System?
12 May 2024 · 4 min · 9K views
What this video covers
Nate measures actual watt draw across all 10 speed settings of a MaxxFan Deluxe installed in a Ford Transit campervan to show how to estimate daily vent fan power consumption for battery and solar sizing.0:58 The fan's instruction manual lists a 5-amp, 12-volt (60-watt) maximum, but measured draw ranges from 2 watts at speed 1 to 43.4 watts at speed 10; the manual figure overstates real-world consumption because it includes the brief lid-raising current spike.1:04 Rather than calculating hour-by-hour speed changes, Nate uses a two-bracket simplification: 43 watts for 16 hours plus 2 watts for 8 hours, totaling 704 watt-hours per day.3:00 Converted to a 12-volt battery bank, that equals 59 amp-hours — 59 percent of a 100 amp-hour battery in 24 hours.3:53 The lesson is part 9 of a system-sizing series and feeds into a later full power audit.0:15 Simplified two-speed bracketing produces a workable daily watt-hour estimate without the complexity of tracking every speed change throughout the day.2:34
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