[Public-List] Electricity Consumption

[Michael Grosh via Public-List]

Jonathan, you are making me reconsider just how badly I want a chart
plotter.
Michael G
#220

On Mar 17, 2017 2:07 PM, "Jonathan Bresler via Public-List" <
public-list at lists.alberg30.org> wrote:

> Did a back of the envelope calculation to see how much power Constance
> might use in a 24 hour day of inshore cruising.  A day of inshore cruising
> being defined as 16 hours of sailing and 8 hours anchored.
>
> What surprised me was the total usage....about 480 watt-hours,  which given
> 8 hours of sunshine on a panel derated by 50% means about 120 watt worth of
> solar panels are required. Holy Cow!     By way of comparison, the
> alternator may generate 55 or 80 amps when running full out, which could
> address the electrical need in less than an hour if it could/would run full
> out for that length of time.   Guess this is the argument for external
> regulation.
>
> Guessing that one conclusion is "turn off the GPS, turn it on when needed
> only".   Offshore turn off the GPS but for obtaining a fix every xxx hours,
> say every four or eight hours.
>
> Note: no allowance for a tiller pilot or other electrically power steering
> device.
>
> Thoughts ?
>
> Jonathan
>
> Single Day Estimated Electrical Consumption assuming 16 hours of sailing
> and 8 hours anchored
> ItemReferenceWattageTimeEnergy
> Anchor Light AquaSignal 20 <http://www.aquasignal.com.au/series-20/> 5W
> 8hr
> 40Wh
> Sidelights AquaSignal 25 <http://www.aquasignal.com.au/series-25-standard/
> >
> 10W 2hr 20Wh
> Sternlight AquaSignal 25 <http://www.aquasignal.com.au/series-25-standard/
> >
> 10W 2hr 20Wh
> Steaming Light ML-2 Combination Deck / Steaming Light
> <http://www.forespar.com/products/sail-combination-deck-bow-light.shtml>
> 10W
> 1hr 10Wh
> Deck Light ML-2 Combination Deck / Steaming Light
> <http://www.forespar.com/products/sail-combination-deck-bow-light.shtml>
> 20W
> 1hr 20Wh
> Compass Navigator Bulkhead Mount compass
> <http://www.ritchienavigation.com/research-compasses/
> compass-by-series/navigator/navigator-bulkhead-mount/>
> 10W 2hr 20Wh
> Depth Sounder ST 40 Depth <http://www.raymarine.com/view/?id=1089> >1W
> 16hr
> 16Wh
> GPS GPSMAP 192C
> <https://buy.garmin.com/en-GB/GB/marine/discontinued/gpsmap-
> 192c/prod319_010-00431-00.html>
> 10W 16hr 160Wh
> Knotmeter ST 40 Speed <http://www.raymarine.com/view/?id=1089> >1W 16hr
> 16Wh
> Wind Indicator ST 60+ Wind <http://www.raymarine.com/view/?id=595> >1W
> 16hr
> 16Wh
> VHF VHF 600
> <http://newcontent.westmarine.com/content/documents/pdfs/
> OwnersManuals/ELECTRONICS/VHF/WM-600%20Manual.pdf>
> ~6W
> recv 16hr 96Wh
> Interior Lights
> Radio
> TV
> Total 434Wh
> Total w/o GPS 274Wh
>
> --
> Jonathan M Bresler
> S/V Constance Alberg 30 #262
> Annapolis/Eastport MD
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