My charge controller was putting out high voltage.

bc buck
bc buck Registered Users Posts: 59 ✭✭
in Solar Beginners Corner #1
I noticed when opening cabin early AM after being gone all week the prostar mppt was putting 15.2 volts at 2A to the battery bank. Battery's showed 100% full. Charger setup absorp14.7v, float 13.5v. Was blinking as if in float stage. Controller seemed to work fine rest of weekend. Should I try to contact manufacturer for defective charger?
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  • Photowhit
    Photowhit Solar Expert Posts: 6,006 ✭✭✭✭✭
    #2
    Do you have it setup for auto equalizing?
    Home system 4000 watt (Evergreen) array standing, with 2 Midnite Classic Lites,  Midnite E-panel, Magnum MS4024, Prosine 1800(now backup) and Exeltech 1100(former backup...lol), 660 ah 24v Forklift battery(now 10 years old). Off grid for 20 years (if I include 8 months on a bicycle).
    - Assorted other systems, pieces and to many panels in the closet to not do more projects.
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  • westbranch
    westbranch Solar Expert Posts: 5,183 ✭✭✭✭
    #3
    Does it have a Temp sensor built in or remote?  Cold = higher volts while charging...
     
    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
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  • bc buck
    bc buck Registered Users Posts: 59 ✭✭
    #4
    Photowhit said:
    Do you have it setup for auto equalizing?
    I forgot to post that but no,was in float mode.  westbranch said:
    Does it have a Temp sensor built in or remote?  Cold = higher volts while charging...
    Yes the remote temp was 32F.
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  • Estragon
    Estragon Registered Users Posts: 4,496 ✭✭✭✭✭
    #5
    You could check temp compensation setting in controller vs battery recommended. Sounds like a high comp for that temp - I would have thought <1v higher. Maybe the CC had just come off absorb and voltage hadn't settled to float?
    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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