Based on 5 reviews
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The calculators are genuinely useful for verifying wire sizes and battery banks. However, from the information available, it seems they do not offer deep engineering design or plan reviews, which is fair but limits their use for complex installations.
What stands out about SolarCalcWorks is the commitment to making every calculation auditable. Unlike many other free tools that return a single number without context, these calculators show the exact NEC 2023 section, the specific table, and the arithmetic behind the result. This is incredibly useful when deciding between wire gauges or sizing a battery bank, as you can verify the logic yourself. The methodology page clearly explains the order of operations, from daily energy use to wire protection, which helps prevent the common mistake of sizing components in the wrong sequence. The distinction between mandatory code requirements and design recommendations is also handled well, with voltage drop clearly labeled as a recommendation. It is reassuring that the site admits its limitations, stating it is a design aid rather than a substitute for a licensed electrician. The transparency regarding funding, with ads never placed between inputs and results, adds to the trustworthiness of the data provided.
Free and auditable solar sizing calculators that show their work. A practical resource for off-grid planning.
From the information available, SolarCalcWorks appears to be a robust resource for DIY solar builders who want to verify their own work. The fact that each calculator displays the specific code section, the table used, and the step-by-step arithmetic is notable. This level of transparency allows users to check the work line by line rather than blindly trusting a single output number. The tools seem well-structured, covering everything from wire sizing to inverter selection, and they clearly distinguish between mandatory code requirements and design recommendations.
These calculators are a refreshing change. I appreciate that every result cites the exact NEC 2023 section and shows the arithmetic. It makes verifying wire gauge and battery bank sizes much easier than guessing from other sites.
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Solar Sizing Calculators provides free online technical calculators for solar, battery, and DC electrical systems. The site offers tools covering wire sizing, voltage drop, fuses, battery banks, charge times, inverters, charge controllers, and solar array configuration. Results from each calculator cite the NEC 2023 code section and show the arithmetic used. The site also offers a Spanish-language edition adapted to the REBT standard with measurements in mm².