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Offline Homefire
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« Reply #10 on: August 31, 2016, 07:39:32 pm »
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  Stuff the wind power.  No were near reliable . 

  Two hundred watt panels should be able to keep your batteries charged enough to get you through the night. 

  When you say 270 Amps are you talking Amp Hour ?   Two 270 Amp Hour Batteries ? 

  What is your expected continuous load ? 

   Best to use 12vdc  as much as you can.  Converters Eat more then they Give.


   As long at it still run's your truck is a option too.  You can top up the batteries in route or even refresh them on site.

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« Reply #11 on: August 31, 2016, 08:07:38 pm »
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Quote:Posted by homefire
  Stuff the wind power.  No were near reliable . 

  Two hundred watt panels should be able to keep your batteries charged enough to get you through the night. 

  When you say 270 Amps are you talking Amp Hour ?   Two 270 Amp Hour Batteries ? 

  What is your expected continuous load ? 

   Best to use 12vdc  as much as you can.  Converters Eat more then they Give.


   As long at it still run's your truck is a option too.  You can top up the batteries in route or even refresh them on site.


Yeah Homie, I meant using 2 X 135 Amh Batteries = 270 Amps per Hour,, But using 2 sets of them having a pair that I can switch over to while the other set is charging, ? If that makes sense.

See my problem lies with the Micro wave oven I bought, they said it was about 7-800 watts but when I went through the book it says it is 1000 watts (input) and the 7/800 watt part is its output,

Now my Inverter will run it because it is a 1000 watts continuous  BUT it has a Surge power rating of 2500 watts so once it starts the inverter runs fine but it is those first TWO seconds that makes it bleep  with a warning, Once it is going it runs fine,

My Fridge only uses less than 0.87 Amps per hour over a 66 hour period so that should be fine

And my TV/ DVD player uses 50w per hour according to the power supply unit,   as does my laptop ? I think ??

If you think those 2 X 100 watt panel will supply enough power then maybe I could get away with the smaller wind generator ? which will solve mounting problems and save on storage space as well as money,  What do you think, ?

J
 

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« Reply #12 on: August 31, 2016, 08:50:12 pm »
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  The Microwave is a erratic use Item.  I would go with a 5oo Watt.  If needed you just cook longer.  No point in hitting a cup of soup or coffee with 1000 Watts. 

  Add up your total Continuous load. 

  Erratic stuff like the Micro Wave add to your continuous load  as a Average.  How many Watt for How Long.

  This calculator give a good Idea of what the battery can do.  It does not take into account  of any charging during use. 

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https://www.batterystuff.com/kb/tools/calculator-sizing-a-battery-to-a-load.html


I would spend the money for the Wind Gen on more Solar Panels or Batteries.  There just a Unreliable  source of power. 

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http://www.metoffice.gov.uk/renewables/wind-map


 

Posted on: August 31, 2016, 08:43:28 pm
Add up all your Continuous  Watts and convert to Amps  .   That would be your Draw on the Batteries.

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« Reply #13 on: August 31, 2016, 09:13:06 pm »
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Quote:Posted by homefire
  The Microwave is a erratic use Item.  I would go with a 5oo Watt.  If needed you just cook longer.  No point in hitting a cup of soup or coffee with 1000 Watts. 

  Add up your total Continuous load. 

  Erratic stuff like the Micro Wave add to your continuous load  as a Average.  How many Watt for How Long.

  This calculator give a good Idea of what the battery can do.  It does not take into account  of any charging during use. 

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I would spend the money for the Wind Gen on more Solar Panels or Batteries.  There just a Unreliable  source of power. 

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Ok well here is what I got so far,

microwave = 1050 watts (input) output is 700 watts, BUT if I use it on the next power setting down MED/HIGH, then it needs 808.5 watts to power it then the output is 539 watts,

So @ 808.5 watts Divided by ( 60 minutes ) = 13.475 watts per minute so RUNNING it for 4 minutes = 53.9 watts Divided by 12 volts = 4.491 Amps that it will consume, ?

Does that make sense to you ?

Once the fridge is cold it turns it's self off and don't kick back in until 2 hrs 30 mins later then it runs for 5 minutes and shuts off for until the next the temp drops again.



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« Reply #14 on: August 31, 2016, 10:38:13 pm »
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Watts / Volt = Amps      Continuous run time.


(808.5 watts) / (12 volts) =
67.37500 amperes     Per Minute.

Your Microwave will be pulling 67.37 Amps while it's running.

Your Battery is rated 270 Amps for One Hour.  

Your batteries would keep the Microwave running for like 4 hours.


 

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« Last Edit: August 31, 2016, 10:43:05 pm by homefire »
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« Reply #15 on: August 31, 2016, 10:55:07 pm »
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Quote:Posted by homefire
Watts / Volt = Amps      Continuous run time.


(808.5 watts) / (12 volts) =
67.37500 amperes     Per Minute.

Your Microwave will be pulling 67.37 Amps while it's running.

Your Batter is rated 270 Amps for One Hour.  

Your batteries would keep the Microwave running for like 4 hours.



I'm not sure about the figures because 808.5 watts divided 230 volts = 3.515 Amps Per Hour, Then How or what do you do to get the 12 volts Current Draw ?

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« Last Edit: August 31, 2016, 11:00:42 pm by Ridge Runner »
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« Reply #16 on: September 01, 2016, 06:42:42 am »
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  Your power source is 12 Volts.   To make watts it take Volts x Amps.       808 / 12  =  67.33333   

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« Reply #17 on: September 01, 2016, 06:57:54 am »
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Quote:Posted by homefire
  Your power source is 12 Volts.   To make watts it take Volts x Amps.       808 / 12  =  67.33333   


Arrr right so what ever the wattage it has to be divided by the Primary Voltage not the Secondary Voltage (230v) then, Thanks for that, I always new the maths parts but never new how the AC worked in relation to the DC Supply ,



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« Reply #18 on: September 01, 2016, 07:02:08 am »
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 If you had a 24V system you would only pull half that.  http://www.supercircuits.com/resources/tools/volts-watts-amps-converter

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« Reply #19 on: September 01, 2016, 07:09:08 am »
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Quote:Posted by homefire
If you had a 24V system you would only pull half that.  http://www.supercircuits.com/resources/tools/volts-watts-amps-converter


Yeah I did think about that but that would mean buying new inverters, and I have 3 Now, But I have found one that puts out 3000 watts and Surges at 6000 watts but I need a minimum of 2 X 270 Amp Batteries or it will kill the batteries, ?

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