MT50 question

celticanuk
celticanuk Registered Users Posts: 2 ✭
in Solar Beginners Corner #1
Hi apologies for my ignorance but I'm after some advice about the MT50 please. I'm hoping this is normal operation and I'm worrying about nothing. The little arrows from the panel to the battery (charge display?) have stopped since plugging the van into mains at a camp site a few days ago. I can't seem to fine any info on normal operation. Can anyone advise?





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  • mcgivor
    mcgivor Solar Expert Posts: 3,854 ✭✭✭✭✭✭
    #2
    There is no load on thr battery, 12.7V represents a fully charged 12V battery at rest, try applying a load and see what  happens, as the voltage drops the PV should begin charging.
    Assumption. Loads are taken from the load terminals and the smiley face says everything is good.
    1500W, 6× Schutten 250W Poly panels , Schneider MPPT 60 150 CC, Schneider SW 2524 inverter, 400Ah LFP 24V nominal battery with Battery Bodyguard BMS 
    Second system 1890W  3 × 300W No name brand poly, 3×330 Sunsolar Poly panels, Morningstar TS 60 PWM controller, no name 2000W inverter 400Ah LFP 24V nominal battery with Daly BMS, used for water pumping and day time air conditioning.  
    5Kw Yanmar clone single cylinder air cooled diesel generator for rare emergency charging and welding.
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  • celticanuk
    celticanuk Registered Users Posts: 2 ✭
    #3
    Thanks mcgivor, I was hoping that was the case but wanted to make sure. Many thanks :)
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  • mcgivor
    mcgivor Solar Expert Posts: 3,854 ✭✭✭✭✭✭
    #4
    Is the controller a MPPT or PWM, if MPPT the input voltage may be too low to provide any meaningful charging. Just an afterthought.
    1500W, 6× Schutten 250W Poly panels , Schneider MPPT 60 150 CC, Schneider SW 2524 inverter, 400Ah LFP 24V nominal battery with Battery Bodyguard BMS 
    Second system 1890W  3 × 300W No name brand poly, 3×330 Sunsolar Poly panels, Morningstar TS 60 PWM controller, no name 2000W inverter 400Ah LFP 24V nominal battery with Daly BMS, used for water pumping and day time air conditioning.  
    5Kw Yanmar clone single cylinder air cooled diesel generator for rare emergency charging and welding.
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  • mountainman
    mountainman Registered Users Posts: 439 ✭✭
    #5
    If the battery is full shouldn't  the  pv show close to voc.
    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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  • littleharbor2
    littleharbor2 Solar Expert Posts: 2,113 ✭✭✭✭✭
    edited August 2019 #6
    According to the battery graphic the battery isn't much more than 1/2 full. Interesting... Also the arrows  are representing charging from the PV. No arrows, no charging.

    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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  • mountainman
    mountainman Registered Users Posts: 439 ✭✭
    edited August 2019 #7
    @littleharbor2 thats how my mt 50 shows the battery as not full @12.7 . It only shows full when changing at 14+ volts??. Are you seeing the arrow that indicates charging? Because I can't.
    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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  • littleharbor2
    littleharbor2 Solar Expert Posts: 2,113 ✭✭✭✭✭
    #8
    mountainman said:
    @littleharbor2 thats how my mt 50 shows the battery as not full @12.7 . It only shows full when changing at 14+ volts??. Are you seeing the arrow that indicates charging? Because I can't.
    What I'm saying is if there's no arrow flashing there's no charging. 

    12.7 is a nearly full battery without any loads or charging which is what your MT50 is showing.
    The voltage and the battery graphic aren't in agreement.

    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 ✭✭✭✭✭
    #9
    Maybe a silly question, but is the van now parked in any sort of shade at the new campsite?
    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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  • spacebass
    spacebass Registered Users Posts: 87 ✭✭
    edited August 2019 #10
    littleharbor2 said:
    According to the battery graphic the battery isn't much more than 1/2 full. Interesting... Also the arrows  are representing charging from the PV. No arrows, no charging.

    The battery graphic is not regarded as very accurate.like it will go from full to half in one go.


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