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 Catalina/Capri 25/250 Sailor's Forums
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 Power vs. Kids		  New Topic  Topic Locked
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NautiC25
Admiral

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USA
957 Posts
Initially Posted - 01/06/2010 :  11:57:55  Show Profile
So in an effort to keep the kids entertained, I thought about adding a DVD headunit, and running a monitor to the front. Who knows, maybe I'll use it too. lol
I just don't know how this will affect power consumption. I don't know what the numbers mean. I know you can run a head unit all day on 2 deep cells, but what about a nice monitor?
If a monitor had a power consumption of 45w, how fast would that drain 2 deep cells using an invertor? How about a 19" designed for a 12v system (car)?
1989 C-25 TR/WK #5894
Miss Behavin'
Sittin' in LCYC on Canyon Lake, Texas
Edited by - NautiC25 on 01/06/2010 12:02:51

JimB517
Past Commodore

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USA
3285 Posts
Response Posted - 01/06/2010 :  13:50:16  Show Profile  Visit JimB517's Homepage
You know at Frys or other electronic store they have portable DVD players, battery operated, that contain screen, speakers, and player. These cost about $100. I'd go with that. My laptop will play DVDs. I use that. It has screen, speakers, and player. It will not run off my 160 watt inverter, but it will charge off the inverter. A laptop has other uses, such as games, and internet. I use my cell phone to tether to the laptop for Internet.

As to power, I have 3, 11 watt flexible solar panels. My engine also has a generator. These meet my power requirements and I can live off the grid for ever.

My electric cooler is another story, and puts me well over the energy budget.
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islander
Master Marine Consultant

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USA
4024 Posts
Response Posted - 01/06/2010 :  14:31:11  Show Profile
You can determine you amperage use with these formulas.
Amps=Watts divided by Volts
Watts = Volts x Amps
Just put in the appropriate values.
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PCP777
Master Marine Consultant

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USA
1225 Posts
Response Posted - 01/06/2010 :  15:11:49  Show Profile
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by JimB517</i>
<br /><b>You know at Frys or other electronic store they have portable DVD players, battery operated, that contain screen, speakers, and player. These cost about $100. I'd go with that. My laptop will play DVDs. I use that.</b> It has screen, speakers, and player. It will not run off my 160 watt inverter, but it will charge off the inverter. A laptop has other uses, such as games, and internet. I use my cell phone to tether to the laptop for Internet.

As to power, I have 3, 11 watt flexible solar panels. My engine also has a generator. These meet my power requirements and I can live off the grid for ever.

My electric cooler is another story, and puts me well over the energy budget.
<hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">


^This^
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Voyager
Master Marine Consultant

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USA
5379 Posts
Response Posted - 01/06/2010 :  20:14:45  Show Profile
Ok, if we talk watts and hours, I think you can figure it out pretty readily.
One group 24 battery stores about 80 Amp-Hours. You can discharge an 80 AH battery about 50% and it will fully recharge. So you have 40 AH at your disposal.

At 12V, you can get 120 W if you pull 10A. With 40AH you can create 120 W for 4 hours.
If you only need 80 W, you will draw 6.5A. You can pull 80W for about 6 hours.

Likewise, at 60W, you have 8 hours.

If you have two group 24 batteries in parallel, you will double your power or time.

If you use an inverter, things are a bit different. Assume the inverter is about 80% efficient. 5A will provide you with 4A x 12v or 48W, not 60W. Given this loss, you will only get 8 hours until you expend 40AH.

If you use 12V appliances, you will have more time. With 120VAC appliances, you'll get sbout 15-20% less time.

Clear as mud, right?
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Stu Jackson C34
Admiral

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844 Posts
Response Posted - 01/06/2010 :  23:32:45  Show Profile
The West Marine Advisors are very helpful. Here's the one on inverters and calculating loads. Who thought you'd finally get something useful out of high school math that was boating related and fun!

http://www.westmarine.com/webapp/wcs/stores/servlet/westadvisor/10001/-1/10001/Inverters.htm

Just find the wattage of what you're considering buying, and only you know what batteries you have on your boat.
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NautiC25
Admiral

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USA
957 Posts
Response Posted - 01/07/2010 :  09:04:48  Show Profile
Thanks for the info. The calculations actually do help quite a bit. I only have a 9 watt panel, so it's not giong to charge my batteries near enough to use the tv every day, but it will be more than enough power for 1-2 day trips. Then the panel will charge the batteries over the work week.
There's some nice 19" 12v car tv's with built in DVD players that wouldn't be a bad option.

Thanks again!
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Unsinkable2
Captain

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USA
273 Posts
Response Posted - 01/07/2010 :  10:51:15  Show Profile  Visit Unsinkable2's Homepage
Check around the RV world too - I often find products targeted to RV owners that work really well for sailing. They're designed for low power consumption, 12v systems, off-the-grid use, and they are generally cheaper...
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.