How do I connect a grid-tie converter to my 12 volt stand alone solarsystem?

Posted by hundefar on January 4, 2011, 5:24 am

Greetings from Denmark!

I have a 180 watt stand alone solarpanel connected to a 12V/150 amp.
batteri, and between a STECA PR 2020 charge controller.

I need maximum 85 Watt for my 12 voltage system, that means the rest
100 watt solar panel is oversize. Is is possible to connect a grid tie
converter 300W to my system so it automaticaly switch to the grid-tie
converter when my battery is full loaded???

Can I buy a charge controller with this funktion build in?

I cannot find anything about the subject on the internet.

Does anybody have a link to a wiring diagram regarding this?

Please send me a short reply, and thank you in advance.

Sincerely,

Henrik Wyke - Denmark

Posted by Josepi on January 4, 2011, 12:52 pm

For a few hundred watts it would not be worth the cost of the cogen
circuitry.
My 3KW unit consumes over 150 watts just to turn it on. Cpgen units usually
have circuitry to detect low input power and disconnect themselves from the
mains / supply when not required. The commutation circuits running idle will
likely waste all your energy and your money.

Greetings from Denmark!

I have a 180 watt stand alone solarpanel connected to a 12V/150 amp.
batteri, and between a STECA PR 2020 charge controller.

I need maximum 85 Watt for my 12 voltage system, that means the rest
100 watt solar panel is oversize. Is is possible to connect a grid tie
converter 300W to my system so it automaticaly switch to the grid-tie
converter when my battery is full loaded???

Can I buy a charge controller with this funktion build in?

I cannot find anything about the subject on the internet.

Does anybody have a link to a wiring diagram regarding this?

Please send me a short reply, and thank you in advance.

Sincerely,

Henrik Wyke - Denmark

Posted by JERD on January 4, 2011, 6:51 pm

This info on a 24volt system may give you some pointers

http://www.swea.nl/PDF/StarterkitManualEng.pdf

JERD

Posted by Josepi on January 4, 2011, 9:31 pm

I didn't need any info on this but the OP might be interested.

This info on a 24volt system may give you some pointers

http://www.swea.nl/PDF/StarterkitManualEng.pdf

JERD

For a few hundred watts it would not be worth the cost of the cogen
circuitry.
My 3KW unit consumes over 150 watts just to turn it on. Cpgen units
usually
have circuitry to detect low input power and disconnect themselves from
the
mains / supply when not required. The commutation circuits running idle
will
likely waste all your energy and your money.

Greetings from Denmark!

I have a 180 watt stand alone solarpanel connected to a 12V/150 amp.
batteri, and between a STECA PR 2020 charge controller.

I need maximum 85 Watt for my 12 voltage system, that means the rest
100 watt solar panel is oversize. Is is possible to connect a grid tie
converter 300W to my system so it automaticaly switch to the grid-tie
converter when my battery is full loaded???

Can I buy a charge controller with this funktion build in?

I cannot find anything about the subject on the internet.

Does anybody have a link to a wiring diagram regarding this?

Please send me a short reply, and thank you in advance.

Sincerely,

Henrik Wyke - Denmark

Posted by Randy on January 6, 2011, 8:31 pm

Hi Henrik
I am not sure what voltage your panel puts out but this may work:
http://sunelec.com/index.php?main_page=product_info&cPath=6_37&products_idX0
If your system is 50 Hz, Enphase might have one for that use.
Hope this helps