Cas Pengawal Penasihat
Lindungi bateri anda daripada pengecasan berlebihan. Padankan output arus tatasusunan panel anda dengan saiz pengawal yang betul.
Konfigurasi Tatasusunan
Penentuan Saiz Pengawal Cas
Pengiraan termasuk Pengganda Keselamatan 1.25 untuk lonjakan voltan cuaca sejuk dan pantulan langit cerah.
Keputusan Kejuruteraan
Masukkan kuasa tatasusunan untuk melihat strategi pengecasan terbaik untuk sistem anda.
Formula Penentuan Saiz
Padankan output arus tatasusunan panel anda dengan pengawal yang boleh mengendalikannya dengan selamat — ditambah penampan keselamatan.
Ampere Minimum Pengawal
A = (Array Watts ÷ Battery Volts) × 1.25 Pengganda keselamatan 1.25 mengambil kira lonjakan voltan cuaca sejuk dan keadaan pantulan terang di mana panel sedikit melebihi output berkadar.
Kecekapan PWM vs. MPPT
MPPT ≈ PWM Harvest + 20–30% Pengawal MPPT menjejaki titik kuasa maksimum panel, memulihkan tenaga yang hilang dalam sistem PWM melalui penukaran voltan-ke-arus.
How to Size a Solar Charge Controller
A charge controller sits between your solar panels and battery bank, regulating the voltage and current flowing into the batteries. Without it, panels would overcharge and destroy batteries. The controller's ampere rating must be high enough to handle the maximum current your array can produce — with a safety margin for real-world spikes.
Why the 1.25 Safety Factor Matters
On cold, clear days — or when bright clouds act as reflectors — solar panels can temporarily produce 20–25% more current than their rated short-circuit current (Isc). Sizing your controller without this buffer risks tripping protection circuits or causing premature failure.
PWM vs. MPPT: Which Should You Choose?
- PWM (Pulse Width Modulation): Simpler and cheaper. Works by rapidly connecting and disconnecting the array, which limits the panel to operating at battery voltage. Best for small systems (under 200W) where panel voltage closely matches battery voltage.
- MPPT (Maximum Power Point Tracking): Actively tracks the panel's optimal voltage-current operating point and converts surplus voltage into usable current. Recovers 20–30% more energy than PWM. Required for all arrays above 200W and any system where panel voltage significantly exceeds battery voltage (e.g., 36V panels on a 12V bank).
Step-by-Step Controller Sizing
- Find Your Array's Total Watts: Multiply panel wattage by the number of panels in your array.
- Note Your Battery Bank Voltage: Most systems run at 12V, 24V, or 48V. Higher voltage systems require fewer amps for the same power.
- Calculate Base Amps: Divide array watts by battery voltage. This is the approximate current the controller must handle.
- Apply the 1.25 Safety Factor: Multiply by 1.25 to guard against cold-weather and reflection spikes.
- Round Up to Standard Size: Controllers come in 10A, 20A, 30A, 40A, 60A, and 80A ratings. Always round up to the next available size.