pascal
Norwalk, CA, USA
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Joined: 08/31/2004
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Ok, with reading through a bunch of the posts, I think I just about have it understood, then all of a sudden I had a brain fart and I'm more confused than ever. Let's try it this way.
I have a tv that draws 190W on average. This goes with a DirectTv dvr receiver that draws on average 60W. Power source will be 6V batteries wired to 12V with a pro-sine inverter. Usage will average 10 hrs per 24 hr period with 3~4 of those after dark.
Can someone tell me the following; (and then explain why so I can use it later)
1. How many amps will I draw from the inverter?
2. How many amps will I draw from the batteries?
3. How many batteries will I need to meet the above power draw keeping them above the 50% charge level?
4. How many watts of solar panels will I need assuming Southern CA sun to keep them charged?
Anyone that can clearly answer these may learn me sumthin' that I can use myself..
-mike
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Bobbo
Memphis, TN
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Joined: 09/16/2007
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1. You have 190 watts + 60 watts = 250 watts at 120v = 2.08 amps from the inverter.
2. You have 190 watts + 60 watts = 250 watts + about 10% ineffeciency = 275 watts at 12v = 22.9 amps from the battery.
3. At 22.9 amps from the battery you will pull 229 amp-hours over a 10 hour timeframe. If that is the only usage you have and don't want to get below 50% you need 458 amp-hours of battery. That is about 4 of the 6 volt golf cart batteries. And keep in mind that is using no lights, no water pump, nothing else.
4. I know nothing about solar panels.
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ozhoo
Anza Borrego Desert
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Let me point you to a calculator. It'll shed some lite for you.
I just spent several months down there running 3 Kyocera 130 watt panels w/ 440 aH of storage. I never dipped below 70% but then I only watched a couple hours of tv per day.
O
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Wayne Dohnal
Banks, OR.
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I agree with Bobbo's numbers. On the solar panels it's pretty easy to make a rough estimate of what you'd need. Since you're drawing 275 watts from the battery for 10 hours a day, if you assume 10 hours of good sun per day, you'd need 275 watts output from the solar panels. (It really has to be somewhat more to account for charging inefficiencies). That will set you back over $1,000. I think looking at a lower consumption TV and satellite receiver is warranted here. As an example, my rig came with a 19" Jensen TV that operates directly from 12 volts and draws 3.5 amps, or about 42 to 45 watts.
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wa8yxm
Wherever I happen to park
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I too agree with BOBBO's numbers, he did good math, in fact he did a bit more than what I'd do (I just divide watts by 10 to get the 12 volt load, easier and not far from accurate.. BOBBO was more accurate)
Of course.. You said 6-7 hours of tv (10 hrs with 3 dark) and 24 hours of sat tv (Most folks miss that one) since it draws power all the time in most cases.
If those hours are DAYLIGHT a solar panel can indeed reduce the need for batteries as can the fact that during the day. You can usually run the Generator (You have either a class A with a nice Onan Emerald or other quiet box or a Honda or Yahama portable right) to charge 'em up
But a 2nd pair of U-2200's or US-2200's or T-105s would not be a bad thing.
Nothin adds excitment like something that is none of your business
Kenwood TS-2000 housed in a 2005 Damon Intruder 377
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