Low voltage panels

mountainman
mountainman Registered Users Posts: 439 ✭✭
in Caravan, Recreational Vehicle, and Marine Power Systems #1

Has anyone tried these? Lol

Screenshot_20190409-132038.png


2kw array 6 345 q cells  make sky blue 60 cc
 6 230ah GC @36 volts 
18 amp accusense charger. 3650 champion 
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  • Tecnodave
    Tecnodave Registered Users Posts: 437 ✭✭✭✭
    #2

    Those panels are just plain weird! VMP 11.71 volts.....what would you do with those oddball panels....pretty useless...anybody got a 6 volt solar system.

    2 Classic 150, 2 Kid, 5 arrays 7.5 kw total  2ea.  2S6P Sharp NE-170/NE-165, 1ea. 12P Sanyo HIT 200,  2ea. 4/6P Sanyo HIT 200, MagnaSine MS4024AE, Exeltech XP-1100,  2 Banks L-16 battery, Rolls-Surette S-530 and Interstate Traction, Shunts with whizbangJr and Bogart Tri-Metric, iCharger i208B  dc-dc buck/boost converter with BMS for small form lithium 8S 16650 or LiFePO4,
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  • littleharbor2
    littleharbor2 Solar Expert Posts: 2,113 ✭✭✭✭✭
    edited April 2019 #3

    Long ago, (1991), Mobil Solar put out a 220 watt low voltage panel. The data label is a bit hard to read but shows 10.55 Vmp. at rather high current. Clearly intended for high module count series strings.

    Mobil Solar 230 2.jpg
    Mobil Solar 230.jpg


    Mobil Solar 220 Mobil RA-220 8b.jpg


    2.1 Kw Suntech 175 mono, Classic 200, Trace SW 4024 ( 15 years old  but brand new out of sealed factory box Jan. 2015), Bogart Tri-metric,  460 Ah. 24 volt LiFePo4 battery bank. Plenty of Baja Sea of Cortez sunshine.

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  • Estragon
    Estragon Registered Users Posts: 4,496 ✭✭✭✭✭
    #4

    Seems to me such a panel might be useful on its own for something like a low voltage remote road sign light, or data aquisition module.

    Off-grid.  
    Main daytime system ~4kw panels into 2xMNClassic150 370ah 48v bank 2xOutback 3548 inverter 120v + 240v autotransformer
    Night system ~1kw panels into 1xMNClassic150 700ah 12v bank morningstar 300w inverter
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  • mountainman
    mountainman Registered Users Posts: 439 ✭✭
    edited April 2019 #5

    They have them on eBay if you need some. Was wondering if you put 2 in series on pwm in the summer heat you wouldn't have to worry as much about voltage drop with longer distances.

    2kw array 6 345 q cells  make sky blue 60 cc
     6 230ah GC @36 volts 
    18 amp accusense charger. 3650 champion 
    · Share on Twitter
  • Tecnodave
    Tecnodave Registered Users Posts: 437 ✭✭✭✭
    edited April 2019 #6

    Let me guess.....from ML Solar in Cambell.....there are 4 separate strings in each panel.....they are about 7.5 amps @. 11.5 volts each string and can be wired in series or parallel on each panel..unusual to say the least! 216 cell panels in a 12 X 18 matrix. These were manufactured for utility scale feed in.....not for grid tie use. ML Solar buys manufacturers leftovers and sometimes assembles their own panels under another name.......Infinium.....BEWARE ! Infinium panels are not UL listed or on any list of acceptable panels for code use......they will not pass BEWARE ! These particular panels are not infinium but get it in writing and signed by Jeff that they are UL listed and acceptable to be used ( on the utility list of acceptable panels) Freind got burned for 5 thou there BEWARE Isaw these turkeys there years ago....... offer .12-15 cents a watt...off grid no code only!,

    2 Classic 150, 2 Kid, 5 arrays 7.5 kw total  2ea.  2S6P Sharp NE-170/NE-165, 1ea. 12P Sanyo HIT 200,  2ea. 4/6P Sanyo HIT 200, MagnaSine MS4024AE, Exeltech XP-1100,  2 Banks L-16 battery, Rolls-Surette S-530 and Interstate Traction, Shunts with whizbangJr and Bogart Tri-Metric, iCharger i208B  dc-dc buck/boost converter with BMS for small form lithium 8S 16650 or LiFePO4,
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  • mountainman
    mountainman Registered Users Posts: 439 ✭✭
    #7

    For a small system 400 watts. with a pwm cc. 25 feet to a portable array. Using 2 runs of 8 awg for 2℅ voltage drop. Summer Temperatures are 85f. Which of these panels would be the better choice?

    IMG_20190502_195927.jpg


    IMG_20190502_200015.jpg


    2kw array 6 345 q cells  make sky blue 60 cc
     6 230ah GC @36 volts 
    18 amp accusense charger. 3650 champion 
    · Share on Twitter
  • Estragon
    Estragon Registered Users Posts: 4,496 ✭✭✭✭✭
    #8
    You may want to look up temp coefficients for the lower Vmp panel, and recommended Vabsorb for your batteries.  With 2% wire loss drop, and maybe as much as 8-10% temp drop, it may or may not work well.  If the adjusted voltage is high enough though, the pwm controller should give more current with the first panel.
    Off-grid.  
    Main daytime system ~4kw panels into 2xMNClassic150 370ah 48v bank 2xOutback 3548 inverter 120v + 240v autotransformer
    Night system ~1kw panels into 1xMNClassic150 700ah 12v bank morningstar 300w inverter
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  • mountainman
    mountainman Registered Users Posts: 439 ✭✭
    edited May 2019 #9
    @Estragon thanks for the reply that's kinda what I was thinking. 16.4 was to low. Temp co ef and  line loss puts me at 15.62 into the cc. found a kinda weirdo 100 watt panel. the picture is not clear but the label  states isc is lower than imp. specs 17.9 vmp and 6.24 imp??  111 watts .Since pwm is amps in amps out im interested in higher amp panels. Seems this one would also be high enough vmp for summer heat.
     
    2kw array 6 345 q cells  make sky blue 60 cc
     6 230ah GC @36 volts 
    18 amp accusense charger. 3650 champion 
    · Share on Twitter

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