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MPPT charge controller Pakistan 2026 news: complete buyer guide. PWM vs MPPT efficiency comparison, 2026 architectural shift to built-in hybrid MPPT, when standalone still wins (off-grid / mobile / industrial), IEC 62109 + NEPRA 2026 certification rules, complete PKR price matrix 10A to 150A+, sizing formula (Wp / V × 1.25), premium 2026 features,...