post #21 of 21
You will want to have 2 times the power output of the solar panels as what your pulling. If your designed system is pulling 500 watts you will want 1000 watts at least from solar. why? because you will be needing to also recharge the batteries which will be drained. also deep cycle batteries you will not want to drain past 50% to prolong their life. Pay attention to stats for constant current draw and length. Batteries will most likely cost more then the solar.

SO a 500watt system (most inverters are about 85% efficient) will pull 575 watts from the batteries. Your system will be pulling 48 amps at 12V (24 amps at 24v....) so your batteries assuming needing to provide power for 12 hours, needs to have at least 575 Amp hours. Optima batteries have this but you will most likely want 3 of them since during winter you will have longer hours of dark and for occasions when its overcast.

You will be spending about:
$600+ in batteries - Recommend something like this ( http://www.odysseybatteries.com/battery/pc1800.htm )

$200 for inverters - Recommend something like this ( http://www.samlexamerica.com/product...roductsID=7017 )

And the Solar Panels (sounds like you already know where and who to buy from)

This is assuming that the solar panels have battery charging/regulating circuits. if not you will need a solar voltage regulator that will provide a constant voltage or off. Some do come with it some dont.


Quote:
Originally Posted by Drenlin View Post
Depending on the power supply and how willing you are to void its warranty, it may be possible so skip the inverter completely and just wire the 12V output of the solar panels through some deep cycle batteries and straight into the PSU. It'd take some creative re-working of the power supply's guts, but it'd be more energy efficient.
A PSU has a rectified 380Vdc bus line which then gets regulated out in to the different lines. the 5V line is not pulled off the 12V line in (any topologies that I know of) it comes off the 380 bus. so you would need a boost converter to up the 12V to 380V and then you can tie it into the PSU that way. you would go to about 90-95% efficient vs about 85%
Edited by Magus2727 - 2/23/11 at 5:24am
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Phenom II X4 965  GIGABYTE GA-790FXTA-UD5 MSI R9 285 CORSAIR DOMINATOR DDR3 
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