My Solar Project !!! (Questions)

12 Posts
Dec 8, 2009 06:31 pm
My Solar Project !!! (Questions)

Hi guys i'm new to this and i'm little unsure to some of the concepts on solar panels.
I'm looking into buying 2 of those:  http://www.altestore.com/store/Solar-Panels/150-Watts-Up-Solar-Panels/Canadian-Solar-Inc-CS6P-190-190W-e-Module-Solar-Panel/p7014/  and installing the in parallel, it says they're are 18V, so is ok if I connected them to bank of batteries that output 12vdc or would i have to configure my batteries in a different pattern, also what kind of charge controller would i need to get?, a variable one? that accepts voltage between 12 and 24vdc? But my main concern is connecting solar panels to batteries, how do i configure that?  I would imagine 12vdc goes to 12vdc batteries but why do they make 18vdc?
thanks
 
578 Posts
Dec 8, 2009 06:43 pm
Re: My Solar Project !!! (Questions)

welcome to the forum.  before you buy anything, i would recommend some more reading and education.

here are some links that may help you

http://www.altestore.com/store/Books-Classes-Educational-Videos/Educational-Videos/Educational-Video-Solar-Electricity-Basics/p6053/

some of the info is a little dated, but it is still good for starters.

http://www.altestore.com/howto/Solar-Power-Residential-Mobile-PV/Off-Grid-Solar-Systems/c33/

http://www.altestore.com/howto/Calculators/c5/

lastly, i would suggest giving some insight to your project.  the classic "what are you trying to do?"  will help others help you with system design and component selection.

good luck.

james
altE staff

AltE
"Making Renewable Do-able"
http://www.altEstore.com/

Tel: 877.878.4060 x107  or +1.978.562.5858 x107
Fax: 877.242.6718  or +1.978.562.5854
 
12 Posts
Dec 9, 2009 12:49 pm
Re: My Solar Project !!! (Questions)

thanks I did see those videos.  My question was if i can connect those pv panels that are rated for 18v to 12v charge controller, or does it have to variable charge controller?
 
578 Posts
Dec 9, 2009 01:22 pm
Re: My Solar Project !!! (Questions)

if you intend to use an array in which the nominal voltage of the array does not match the nominal voltage of the battery bank, but instead is higher, the controller will have to be an mppt controller that is capable of down converting voltages and handling the ampacity of the array.

here is an article that may help you.

http://www.altestore.com/howto/Solar-Power-Residential-Mobile-PV/Solar-Components/Solar-Panel-Charge-Controllers/Sizing-MPPT-Charge-Controllers/a61/

james
altE staff


AltE
"Making Renewable Do-able"
http://www.altEstore.com/

Tel: 877.878.4060 x107  or +1.978.562.5858 x107
Fax: 877.242.6718  or +1.978.562.5854
 
12 Posts
Dec 9, 2009 03:43 pm
Re: My Solar Project !!! (Questions)

"My question was if i can connect those pv panels that are rated for 18v to 12v charge controller, or does it have to variable charge controller?"

Most any 12 volt charge controller will handle 18 volts input. Some panels have 21-22 open circuit voltage. It's the current handling ability of the controller that's important.
 
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