23.2 Voc Solar Panel vs 24v Battery

safaenet
safaenet Registered Users Posts: 1 ✭
in Solar Beginners Corner #1
Hi, I'm new to solar and have a question in my head: Can we use a 23.2 Voc Solar panel to charge a 24v Battery (2x12v in seris) using a 10Amp 12-24v PWM charge controller ?
Here are the specs:
Solar Panel:
Model: Yingli YL80c-18b Mono
Rated Power: 80w
Rated Voltage: 19.1v
Rated Current: 4.19A
Voc: 23.2v
Isc: 4.42A
Max system voltage: 50v

Batteris: 2x12v 4.5Ah conventional battery
Charge controller: LandStar LS1024EU which supports 12-24v
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Comments

  • Estragon
    Estragon Registered Users Posts: 4,496 ✭✭✭✭✭
    edited July 2018 #2
    You could put 2 panels in series for ~38Vmp and ~4a assuming the controller is ok with Voc. If you're in a cold climate, Voc could get close to the 50v limit of the panels..

    One panel wouldn't work for 24v nominal bank (needs ~28ish volts for charging).
    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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  • BB.
    BB. Super Moderators, Administrators Posts: 33,623 admin
    #3
    You need Vmp-std ~35-40 volts to "reliably/quickly" recharge a 24 lead acid battery in most conditions.

    Voc (voltage open circuit) is the panel voltage when there is no current flowing--Not useful for charging/running DC loads.

    Two of your panels in series would be the normal setup for a PWM controller charging a 24 volt  battery bank (Vmp-array~38.2 volts in standard test conditions).

    -Bill
    Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset
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  • Photowhit
    Photowhit Solar Expert Posts: 6,006 ✭✭✭✭✭
    #4
    The panel is a 12 volt nominal panel and you could put the batteries in parallel and charge it at 12 volts.

    The batteries are very small at "...12v 4.5Ah conventional battery..."
    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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