what panel I should use

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I purchased a 9900kw solar electric system from a local dealer with a 50% rebate It has 45 sunpower SPR-220 PV module panels. They don't make them any more and on S&P's site the substituts are SPR-230 SPR-225 SPR-215 SPR-210. Could you recemend one of these panels. I just found out about guarente highest minimum power out of box and can't figure wich to use. Green horn going green.

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  • westbranch
    westbranch Solar Expert Posts: 5,183 ✭✭✭✭
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    Re: what panel I should use

    Andy, what is it you wish to do? Add more panels? :confused:

    Crewzer has posted some good information on mix and matching panels of similar output on the Technical forum. They are a good read if you are wanting that type of information

    PS is it 9900 w ? (vs Kw)

    cheers
    Eric
     
    KID #51B  4s 140W to 24V 900Ah C&D AGM
    CL#29032 FW 2126/ 2073/ 2133 175A E-Panel WBjr, 3 x 4s 140W to 24V 900Ah C&D AGM 
    Cotek ST1500W 24V Inverter,OmniCharge 3024,
    2 x Cisco WRT54GL i/c DD-WRT Rtr & Bridge,
    Eu3/2/1000i Gens, 1680W & E-Panel/WBjr to come, CL #647 asleep
    West Chilcotin, BC, Canada
  • System2
    System2 Posts: 6,290 admin
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    Re: what panel I should use

    I would like a recommendation on which Sun Power Panels to use. I bought this system from a contractor and the choice of panels are what I need help with. Should i bail out of the contract and lose the $500.00 plus 50% rebate and start over. It is suppose to be a 9900 kw system which has 45 Sun Power 220 PV module panels, but they dont make them any more. Now I need to know which one is the best most efficent of the choices that I have to chose from which are : SPR210, SPR215,SPR225, and the SPR 230.I want to go green but now am unsure, not sure if it is worth it!
    PS I think 9900kw grid tie in
    Thank you Up In The Air
  • westbranch
    westbranch Solar Expert Posts: 5,183 ✭✭✭✭
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    Re: what panel I should use

    are these the right links?

    http://www.sunpowercorp.com/Smarter-Solar/The-SunPower-Advantage/~/media/Downloads/smarter_solar/DRoseWCPEC4%20FINAL.ashx

    http://www.perfectpowernetwork.com/ProductInfo.aspx?productid=SPR-220

    http://www.perfectpowernetwork.com/pdf/SPR-220.pdf

    compare to Mitsubishi for example:

    http://global.mitsubishielectric.com/bu/solar/products/pvmodule/spec01.html

    and Evergreen/Sun:

    http://www.evergreensolar.com/upload/pdf/us/S190_US_010407.pdf


    Note the specs and there are also references to grid tie systems to read up on.


    I see that the 220 w units you are asking about are rated @ ~40 volts therefore may be good for charging a 36 volt system, assuming a good MPPT charge controller. Some of the experts here can give you a more definitive answer.

    What other components are in the 'package'? These are wuite reelvant ot your evaluation of value...

    cheers
    Eric
     
    KID #51B  4s 140W to 24V 900Ah C&D AGM
    CL#29032 FW 2126/ 2073/ 2133 175A E-Panel WBjr, 3 x 4s 140W to 24V 900Ah C&D AGM 
    Cotek ST1500W 24V Inverter,OmniCharge 3024,
    2 x Cisco WRT54GL i/c DD-WRT Rtr & Bridge,
    Eu3/2/1000i Gens, 1680W & E-Panel/WBjr to come, CL #647 asleep
    West Chilcotin, BC, Canada
  • BB.
    BB. Super Moderators, Administrators Posts: 33,479 admin
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    Re: what panel I should use

    Remember that SunPower panels require POSITIVE GROUND systems... If they are connected to a negative ground system they may loose something like 50% of their power (connecting them back to positive ground system will "fix the problem" within hours--or faster).

    So, for Grid Tied systems, what inverter do you have? Typically it will be a Xantrex Inverter configured for positive ground.

    Solar Guppy would have to weigh in here whether or not a positive grounded GT inverter works well with normal SI panels---From what little I have read, it should not be a problem.

    WestBranch,

    The issue with using SunPower panels with MX 60 and other MPPT solar charge controllers is that (as far as I know) they are typically wired as negative grounded systems.

    And while you can wire some of them (like the MX 60 from Outback??? I think???) as a positive ground (like for telephone system applications)--it is non-standard and would probably cause lots of confusion for everyone that assumes a DC solar system is negative ground...

    -Bill

    PS: A 36 volt DC battery would require roughly a minimum of 50 volts from solar panels for proper operation...
    Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset