TheBackShed.com

Forum Index : Windmills : Residential Solar Systems..

Author

Message

marcwolf

Senior Member

Joined: 08/06/2009
Location: Australia
Posts: 119

Posted: 12:27am 12 Jun 2009

Copy link to clipboard

Print this post

Hi Folks
With the sudden interest in residential solar systems I am sure (myself included) there are are folks intested in getting the both of best worlds (water power excluded :> )

After chatting with some suppliers it seems like a common configuration is this

Sunpower PV Panels 210W 40Volts
2KW Invertor

The configuration the fellow told me that he installs is 5 of these panels in series. That give 200VDC going into the invertor.

However they can wire in parellel however that still means about 40VDC

This could means some tricky rewiring of the stator to get the best voltage to tie directly into the system.. Or maybe a seperate invertor ($$$)

I am still getting more information so I'll keep you posted. But its somthing to keep in mind when designing your next F&P system.

Take Care
DaveEdited by marcwolf 2009-06-13

Coding Coding Coding..
Keep those keyboards coding..
RAW CODE!!!!!

Tinker

Guru

Joined: 07/11/2007
Location: Australia
Posts: 1904

Posted: 01:31pm 12 Jun 2009

Copy link to clipboard

Print this post

Dave, the 40V quoted is the open circuit voltage of that solar panel. You wont get that with a load (battery) connected.

I am planning to buy two of these panels (in parallel) to charge a 24V battery bank which powers a 24V, 1.2KW inverter.

Klaus

marcwolf

Senior Member

Joined: 08/06/2009
Location: Australia
Posts: 119

Posted: 07:08am 13 Jun 2009

Copy link to clipboard

Print this post

Actually the open voltage of the panels (SUNPOWER range - residentual) is 48.5 V The 41v is the rated voltage.

Hopes this helps

Dave

Coding Coding Coding..
Keep those keyboards coding..
RAW CODE!!!!!

Tinker

Guru

Joined: 07/11/2007
Location: Australia
Posts: 1904

Posted: 02:33pm 13 Jun 2009

Copy link to clipboard

Print this post

marcwolf said Actually the open voltage of the panels (SUNPOWER range - residentual) is 48.5 V The 41v is the rated voltage.

Hopes this helps

Dave

You are right Dave, I have the spec sheet in front of me.
However, if you look at the IV curve you'll see that even 40V is right at the curved region of the graph.
To charge a 24V battery bank one needs to have about 28V available and that falls neatly in the flat part of the IV curve.

Hope that helps as well

Klaus

Print this page

To reply to this topic, you need to log in.