Off-Grid Solar Calculators & Planning Tools

Explore the topic · Educational planning tools

Organize your energy and storage assumptions before comparing equipment. These tools provide estimates—not electrical designs, measured product tests, or guarantees of runtime.

Published calculators

Guides to help interpret your estimate

Get a useful starting estimate

  1. List daily energy use (Wh or kWh), separately from peak power (W). Use labels, utility data, or measurements where possible.
  2. Choose a realistic autonomy target and document your usable-capacity, efficiency, and reserve assumptions.
  3. Review nominal voltage and product limits. A calculated amp-hour value does not establish compatibility.
  4. Check the exact equipment manuals, current ratings, communications, operating temperatures, and warranty before purchase.

What a capacity estimate cannot do

The battery calculator estimates nominal storage from daily energy use, autonomy, usable fraction, efficiency, and reserve. It does not select array size, controller, conductors, protection, grounding, disconnects, mounting, battery configuration, or permits.

It cannot predict weather, aging, actual appliance consumption, simultaneous load peaks, or a particular inverter’s behavior. A product may meet a nominal capacity target while being unsuitable for the system.

Never use a result as a wiring diagram or permission to connect components. Follow current manuals and applicable requirements, and use qualified professional review for system design and installation.

SolOffGrid’s calculators are educational planning aids for U.S. readers, not a substitute for an energy audit or professional engineering. How we research.

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