Same sun different charge rates

PluckaPlucka Registered Users Posts: 61 ✭✭
Yesterday lithium batteries were 13 volts @ 9 am and solar mppt charger was putting in 17.6 amps.                                                                         Today same weather batteries were 13.3 volts @ 9 am but charger was only putting in   15.6 amps .Is this normal or has a bird done it's business on my panels?            


  • mcgivormcgivor Solar Expert Posts: 2,394 ✭✭✭✭✭
    Higher voltage lower current, day to day temperature difference, different state of charge to mention a few possibilities, not something to be over concerned with, IMHO.
    1500W, 6× Schutten 250W Poly panels , Schneider MPPT 60 150 CC, Schneider SW 2524 inverter, 400Ah LFP 24V nominal battery bank 
    900W  3 × 300W No name brand Poly panels, Morningstar TS 60 PWM controller, no name 2000W inverter 400Ah FLA 24V nominal as a backup system. 
    5Kw Yanmar clone single cylinder air cooled diesel generator for rare emergencies and welding.
  • EstragonEstragon Registered Users Posts: 3,006 ✭✭✭✭✭
    As mcgivor notes, within normal day-to-day variation. If worried about a bird bomb, by all means go look with a damp sponge. Could also be an errant leaf or twig. I'd also ignore it unless it was a persistent problem.
    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
  • PluckaPlucka Registered Users Posts: 61 ✭✭
    edited August 12 #4
    today  is cooler -probally the difference. thanks
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