Off-Grid Advanced

Off-Grid System Design: A Complete Walkthrough

Designing a complete off-grid system from scratch: load analysis, array sizing, controller selection, battery sizing, and inverter choice.

1-2 hours Comfortable with electrical concepts

Step 1: Load Analysis

List every appliance and its watts, then estimate hours used per day. Total daily kWh is your design target. Factor in large loads like pumps or power tools that spike current.

Step 2: Array and Battery Sizing

Array size = daily load / sun hours with ~20% extra for cloudy days and losses. Battery capacity covers 1-3 days of autonomy. Use our calculators to speed this up.

Step 3: Controller and Inverter Selection

Match your MPPT charge controller to array Voc and string current. Choose an inverter rated for your surge loads. Buy quality components — cheap ones fail fast off-grid.

Quick Safety Tips
  • Always disconnect power before working on any component.
  • Panels generate voltage in sunlight — even unplugged.
  • Use proper-rated DC breakers and fuses.
  • Check local codes and permit requirements first.
  • Contact a licensed electrician for grid connections.
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