Rainy weather often brings temperature fluctuations, which affect lead-acid battery chemistry. Cold reduces capacity, while heat increases water loss (in flooded types) and accelerates grid corrosion.
Since PV systems already struggle with low charging current in cloudy weather, cold temperatures further reduce charge acceptance, worsening sulfation. Conversely, high humidity combined with warmth may increase self-discharge rates.
Best Practices:
- Install batteries in temperature-stable locations.
- Use insulated battery boxes in cold climates.
- Monitor electrolyte levels (for flooded batteries).
