amp draws

[Gammara2]

Ok folks out there in sailing land- could someone out there give me a rough
idea of what various applianes on a 37 ft sailboat will draw on an hourly
basis, assuming dc use only? Similairly what will solar, wind and gas
generators produce? eg

lights
fridge/freezer
electronics
2 tvs
etc etc

thanks jim

[Vaughn]

Unfortunately, there is no answer. Are these 110 volt appliance with a
converter? How big a TV. How many lights and what wattage (by the way, the
wattage is the draw so you'll have your answer) freezer/refrigerator, what's
the usage, where are using it and what brand and what size.

Some 37 footers are similar some are plush. solar, wind and gas generators
all have their output on them, there is no standard.

Gammara2 wrote in message <20000409020431...@ng-cu1.aol.com>...

[LS]

In article <20000409020431...@ng-cu1.aol.com>,

gamm...@aol.com (Gammara2) wrote:
>Ok folks out there in sailing land- could someone out there
give me a rough
>idea of what various applianes on a 37 ft sailboat will draw on
an hourly
>basis, assuming dc use only? Similairly what will solar, wind
and gas
>generators produce? eg
>
>lights
>fridge/freezer
>electronics
>2 tvs
>etc etc
>
>thanks jim
>
>

Some general info about marine electrical systems:

Blue Sea Systems: Electrical Properties - Annealed Copper Wire
http://www.nas.com/electric/data.html

Blue Sea Systems: Fuses and Circuit Breakers
http://www.nas.com/electric/select.html

Blue Sea Systems: Circuit Protection
http://www.nas.com/electric/circuit.html

Marine Electrical Check List
http://www.islandnet.com/~robb/marine.html

Tips on Electrical System Use and Maintenance
http://www.yachtsurvey.com/ElectricalSystems.htm

Solving Chronic Battery Problems
http://www.yachtsurvey.com/batteries.htm

Electrical System Principles
http://catalog.com/bobpone/HotTipElect.htm

Solar Basics
http://www.windsun.com/Solar_Basics/solar_electric_basics_1.htm

Solar Electric FAQ
http://www.windsun.com/PV_Stuff/solar_FAQ.htm

PETER KENNEDY YACHT SERVICES: Recommended Reading
http://www.pkys.com/publications.htm

Lee Shroud
--
lee_s...@excite.com

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[LS]

One more:

Ancor: Technical Information
http://www.ancorproducts.com/technical.html

[Peter Kennedy]

Obviously its impossible to answer such a general question with numbers.
Its not that hard to work out the numbers however if you know the loads.

Multiply the amp draw for each appliance by the hours per day use and add up
the total to give daily amp hours

You might come up with different figures for different uses, ie 24 hour a
day offshore sailing would give you one figure and coastal cruising
anchoring at night would give you another. Generally the anchoring scenario
gives the most power consumption as you would normally have more lights on
in that case.

When you have come up with a figure then you have to work backwards to find
out how many hours you must operate your generating sources to equal that
figure and allow for some inefficiency in the system.

Just to give you an idea of the numbers you might come up with you could use
100 Amp Hours per day as a benchmark figure for a boat like yours.

You can see an example of the calculation done in more detail in Charlie
Wing's book. You will find details of that on my website.

Cheers,

--
Peter Kennedy
Peter Kennedy Yacht Services
Marine Electrical Systems
http://www.pkys.com

Gammara2 wrote in message <20000409020431...@ng-cu1.aol.com>...

[Capt. Ahab]

Gammara2 <gamm...@aol.com> wrote in message
news:20000409020431...@ng-cu1.aol.com...

> Ok folks out there in sailing land- could someone out there give me a
rough
> idea of what various applianes on a 37 ft sailboat will draw on an hourly
> basis, assuming dc use only? Similairly what will solar, wind and gas
> generators produce? eg
>

> lights flouresent> 5-10 ah 12 hrs
> fridge/freezer> 60 ah 2/3 on time
> electronics >5-10 Ah
> 2 tvs >1-30Ah
> etc etc> 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15Ah ......................etc
etc

Asume that your moving your house aboard! If this is so you consume a low
average of 600+ Kilowatts. Divide this by 30 days divided by 24 hours
divided by 12 volts and viola you have your total hourly draw. That would
be 70 amphours at 12 volts. That would be the equivelent of your auto
alternator going full blast. If you buy a 5-10kw watt diesel gen set you
will be well served, You will save space as you can pack more fuel than
batteries pound for pound. You would simply run the diesel when ever you
want high power. Run off a couple of old car batteries until they go flat
and then wumpum you start your electric iron genny!! and status is renued.

You may find that power boating is more to your liking cubby as sailing is
more of a tent camping mountaineer roughing it kind of sport.

Good luck!!

Captain Ahab