Re: Some phoaties of a domestic solar system
- From: Scotty <nobody@xxxxxxxx>
- Date: Sun, 17 May 2009 00:23:24 +0200
On Sat, 16 May 2009 20:22:12 +1000, "Adam Whyte-Settlar" <ador@ble> wrote:
"Scotty" <nobody@xxxxxxxx> wrote in message
news:9vqo05lljd1qt8uqgi5h52vi3cov72b7oa@xxxxxxxxxx
As Adam says, the system can "pump" 120 amps at 12v but the cables would
have to have been the size of welding cables or motor car starter cable.
I was referring to your rather quaint use of the word "pump", one I've
never heard in electrical engineering circles... Did you see those funny
little things around the word?
I was being helpful, if you really have a system that can pump 60 amps then
you should be using the type of cable I mentioned or similar, or wire them
in series as I have or as I suggested, see below.
Er... I never said any such thing. If you are going to make ridiculous
claims about people at least get your attributions right.
Want to see the solar power system I designed and built for my housebus
from
scratch? Under normal sunny conditions it keeps me supplied perpetually.
If I do have to recharge them I can pump in 60 amps. It takes four hours to
charge them from 'flat' to a point where I can use them to power everything
I need for ten days.
Lets see the system you built smartarse.
My reply was:
<quote>
Lets see the system you built smartarse.
If we are talking about 60 amps of SOLAR current then you would have
approximately 8 average sized panels? 720 watts worth of solar panels, if
you have a 12 V system, I would have assumed that your bus would have been
built on a truck chassis and have 24 V batteries. In which case 60 amps
would be approx. 1400 watts.
The copper losses at 60 amps, the mass and cost for 60 amp cables is, well
extreme. The proper way, as I have done, is to wire the panels in series,
reducing the current to approx 7.5A and increasing the voltage to 120
volts, something much more efficient. Then you use something like this
next to the batteries with very short 60 Amp connections.
http://www.outbackpower.com/
Geddit?
I KNOW my memory is shot... etc.
.
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