Help Midnite Solar Classic 150 Experts - Resting not float

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  • PhotowhitPhotowhit Solar Expert Posts: 5,495 ✭✭✭✭✭
    I have installed 200(watt) pv per piece and put it in series for 7 panels 
    There are some 200 watt 12 volt nominal panels out there but they are pretty unusual. Like Bill I'm worried you may have too high a voltage for the charge controller. If you could give us the VMP and VOC numbers from the back of your panels that could be helpful.

    Also in the previous replies to this old thread @boB gave you the method to discover why the charge controller is in 'resting'.  boB is a designer of the Midnite Classics, so this would be valuable information in trouble shooting your situation.  boB said;

    Take a look at the Reason for Resting number.  From the main status screen, HOLD down the LEFT-ARROW key and tap the ENTER key...   A new menu comes up and there should be a number at the top middle of the screen (and some other numbers).  OR, take a picture of it. 
    Home system 4000 watt (Evergreen) array standing, with 2 Midnite Classic Lites,  Midnite E-panel, Prosine 1800 and Exeltech 1100, 660 ah 24v ForkLift battery. Off grid for @16 of last 17 years. Assorted other systems, and to many panels in the closet to not do more...lol
  • SanmedrxgmppharmaSanmedrxgmppharma Registered Users Posts: 64 ✭✭
  • SanmedrxgmppharmaSanmedrxgmppharma Registered Users Posts: 64 ✭✭
    panel pv
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    default miildpniteite
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  • SanmedrxgmppharmaSanmedrxgmppharma Registered Users Posts: 64 ✭✭
    can you help me what to adjust in midnite
  • SanmedrxgmppharmaSanmedrxgmppharma Registered Users Posts: 64 ✭✭
    Type your comment.if i connect direct to the pv this will light if both connected midnite its off
  • SanmedrxgmppharmaSanmedrxgmppharma Registered Users Posts: 64 ✭✭
    dsetup
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  • boBboB Solar Expert Posts: 980 ✭✭✭✭
    You can't put 7 of those 43.2Voc panels in series on a 200V input controller.   The input could be above 300 volts Voc  It'l blow up

  • SanmedrxgmppharmaSanmedrxgmppharma Registered Users Posts: 64 ✭✭
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  • BB.BB. Super Moderators, Administrators Posts: 31,328 admin
    edited July 2019 #61
    That is a photo of the WBjr Shunt status... And no WBjr is installed (?)

    I think that this is the wrong status screen... Press and hold Left Arrow key and while holding < , tap the [enter] key.

    I have never seen a Midnite Classic--Just my understanding of the button presses.

    You have a:

    200 Watts
    Voc 43.2 volts
    Isc 6.17 amps
    Vmp 36 volts
    Imp 5.56 amps

    That means your Voc-array is ~7x43.2 volts = 302.4 volts (array cool at ~25C).

    Way over your controller's operational range.

    From using the Midnite Classic sizing tool for the 200 volt rated unit... You should be using 4 panels in series x 1 or 2 (or more) parallel strings. You could run 5 panels in series, but it is marginal .

    So, either your system shut down because of over voltage (Hypervolt)--Or was damaged by extreme overvoltage >> 248 maximum voltage). Or your system is OK, and presently your array wiring is "broken". 

    In any case, you need to rewire to 3 or 4 panels in series --- 5 is sort of OK... 6+ is too high.

    http://www.midnitesolar.com/sizingTool/index.php

    Here is the 4sx2p panel string (you current have 7 series x 1 parallel with 10C low to 45C high --Too many panel in series). You presently have 7 panels--So you either need +1 panel, or cut back to 6 panels for now (3s x 2p).

    How to use the Classic String Sizing Tool


    PV Array
    Rated PV Array Power:1600Watts
    Anticipated Array Power @ 45C:1456Watts
    Rated PV Array Current:11.12Amps
    Battery Charging Current @ 57.6 V:27.8Amps
    VMP (Maximum Power Point Voltage) :144Volts
    VOC (Open Circuit Voltage):172.8Volts
    VMP @ 10 C°:153.6Volts
    VOC @ 10 C°:181.2Volts
    Classic, Classic SL & Classic Lite Charge Controller Selection
    150200250
    Max Operating Voltage150200250
    Max Non operating VOC (HyperVOC) @ 48V Nominal Battery Voltage198248298
    Maximum Number Of Modules In Series345
    Max Number Of Modules In Series (Using HyperVOC)456
    Max Allowable Output Current Per Classic 
    Based On This Current Configuration
    766555
    Max Allowable Wattage Per Classic 
    Based On This Current Configuration
    443837963212
    Present PV Array Wattage Of This Configuration160016001600
    Design Check
    Max VOCMARGINAL 
    (HyperVOC)
    OKOK
    Temperature The Classic Will 
    Enter HyperVOC
    ALWAYS-23 C°-110 C°
    Array Power (Wattage)OKOKOK
    Classics Required0.40.50.5
    NOTE: MidNite Solar recommends a second controller be added after 1.2
    NOTE: Generally speaking you'll want to use the Classic 150 or 200 as they are less expensive and will handle more power. With MPPT controllers the higher the input voltage the less efficient they are. This is not a large value but it will add up to a little more heat in the controller and a point or two less in efficiency. BUT you also have to be careful not to have the input voltage to low. Most all MPPT controllers will want to see a minimum of 130% of the actual high battery voltage. So if we have a 48v battery and it has an Equalize voltage if 62.3 volts than we would multiply that by 130% and we would need a minimum of 81 volts on the input on the hottest day of the year in order to have enough headroom for the MPPT to work.
    WARNING: MidNite Solar makes no representation, warranty or assumption of liability regarding the use of the String Calculator. This tool uses data provided by other parties (such as PV module specs) and makes calculations based on assumptions which may or may not prove to be valid.

    -Bill
    Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset
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