Flat cover graphic titled ‘Solar Charge Controller Guide (2025)’ featuring a panel, MPPT controller, and battery in Solar Craftsman brand colors.

DIY Solar Charge Controllers: Sizing & Installation Guide for Tiny‑Home and Van Systems (2025)

In This Article1 Introduction2 1. What a Solar Charge Controller Does3 2. PWM vs. MPPT: Which Technology Should You Buy?4 3. How to Size a Solar Charge Controller4.1 3.1 Quick Formula4.2 3.2 Lookup Table (Common DIY Sizes)4.3 3.3 Voltage & Voc Limits5 4. Recommended Controllers for 20256 5. Wiring & Installation (Step‑by‑Step)6.1 5.1 Tools &…