Author Topic: Oztules please  (Read 1090 times)

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Offline junglejoe39

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Oztules please
« on: October 02, 2015, 09:15:03 PM »
Sorry for asking for you personally but figured you would know this. Plus you know some of what Im talking about from my other post. So I have those 4-100 watt panels that are the 5 inch china jobs wired in parallel with a 150 watt of the 6 inch USA type going to a 12 v 600 watt inverter. Are the 5 inch jobs choking down the 6 inch and I have 2 more of the 6 inch panels wired in series going to a 24v 600 watt inverter. Im wondering if I will get more power and think I will if I hook the 3 150 w 6 in panels in parallel to the 12 v inverter and then the 4 100w 5 in in series and parallel to the 24v inverter

Offline oztules

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Re: Oztules please
« Reply #1 on: October 03, 2015, 03:17:36 PM »
It is probable that the 6x6 are pulling down the 5x5....not the other way around...... why?

I suspect your 6x6 run at a lower voltage than the 5x5 panels. As a generality, the 6x6 cell 250w panels are 60 cells ( 30x 2 for 12v panels) and the 5x5 cell 72 cells ( 36 x 2 for 12v panels).......or even some other combo.......... Same watts, but different current and voltage to get the same watts.... count the cells in each type of panel.

If the cell count ( or the Voc from the sticker)  in the 5x5 is the same as the 6x6, then no loss of watts in the parallel connection as the Voc is the same..... if different ( Voc is different)...... then you will do a bit better if you match them up as you suggest... 5x5 together and 6x6 together to independent inverters.

More in depth understanding of solar panels can be obtained here also in a series I wrote on another site

http://www.fieldlines.com/index.php/topic,145005.0.html


..................oztules
Flinders Island...... Australia

Offline junglejoe39

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Re: Oztules please
« Reply #2 on: October 03, 2015, 03:57:02 PM »
the 5 in. voc is 21.60 and the 6 in. is 22.92

Offline oztules

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Re: Oztules please
« Reply #3 on: October 03, 2015, 04:27:57 PM »
The difference is not enough to get me excited, although some minor improvement could be realised..... I would not worry if it required any work to change.....




...............oztules
Flinders Island...... Australia

Offline rossw

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Re: Oztules please
« Reply #4 on: October 03, 2015, 07:24:55 PM »
the 5 in. voc is 21.60 and the 6 in. is 22.92

For extracting the most from your PV, V(oc) is much less important than V(mp) anyway.

Offline junglejoe39

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Re: Oztules please
« Reply #5 on: October 04, 2015, 02:03:08 PM »
Again thanks guys. Part of the reason Im thinking of changing is using the panels as a roof over my deck. The wiring is indeed quite open to me. Also I seem to get a little better efficiency from the 24 v inverters.