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Posted by Another Pn'er on October 2, 2007, 4:39 pm
 
: quoted-printable

This might sound crazy, but I would like to know how to calculate Kw to =
dc voltage.

What I want to do is run a 5Kw diesel generator to charge deep cell =
batteries and have the batteries run a 1500 watt heater.

Can someone tell me the formula to calculate how many batteries I need =
and what kind?

Please email me at:

Garry
gag953@3web.com

Thanks
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<DIV><FONT face=Arial size=2>This might sound crazy, but I would like to know
how to calculate Kw to dc voltage. </FONT></DIV>

<DIV><FONT face=Arial size=2></FONT>&nbsp;</DIV>
<DIV><FONT face=Arial size=2>What I want to do is run a 5Kw diesel generator to
charge deep cell batteries and have the batteries run a 1500 watt
heater.</FONT></DIV>

<DIV><FONT face=Arial size=2></FONT>&nbsp;</DIV>
<DIV><FONT face=Arial size=2>Can someone tell me the formula to calculate how
many batteries I need and what kind?</FONT></DIV>

<DIV><FONT face=Arial size=2></FONT>&nbsp;</DIV>
<DIV><FONT face=Arial size=2>Please email me at:</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT>&nbsp;</DIV>
<DIV><FONT face=Arial size=2>Garry</FONT></DIV>
<DIV><FONT face=Arial size=2><A
<DIV><FONT face=Arial size=2></FONT>&nbsp;</DIV>
<DIV><FONT face=Arial size=2>Thanks</FONT></DIV></BODY></HTML>

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Posted by dogbreath on October 2, 2007, 5:51 pm
 
On Tue, 02 Oct 2007 12:39:24 -0400, Another Pn'er wrote:


voltage.

and have the batteries run a 1500 watt heater.

what kind?

Power = Current X Voltage
Assume 12V batteries:
1500 = Current X 12V
1500/12 = Current
1500/12 = 125A of Current
We're talking more batteries than it would be worth. If you are running a
5KW generator, why not just plug in the heater?
Jeffrey



Posted by Terryc on October 3, 2007, 1:11 am
 dogbreath wrote:


what kind?

Which is ten Trojan 125Amphr deep discharge lead acid batteries[1], but
I'm not sure how you'd go paralleling that many batteries without
individual battery current control.

[1] These were $AUS300 each when I last purchased them, but $AUS-$US
might make them cheaper if lead hasn't gone up too much.

You could also go for 13 of the 100AmpHr, which were only $00 per
battery more rcently,

Posted by Eeyore on October 3, 2007, 1:10 am
 

Another Pn'er wrote:



Posted by Roderick on October 3, 2007, 1:21 am
 Do you have any other sources of energy you can use for heat?  As the
other poster mentioned, it would be mighty expensive to run a heater
off batteries.  It would be better to use the batteries only for your
electronic loads, like computers and lighting, and if you need a lot
of power, fire up the generator.

Or even better, location permitting, get and store heat directly from
the sun.


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