Cable Size Calculator

Cable Size Calculator — NEC Solar Wire Sizing App
NEC 690.8 · Solar Wire Sizing

Size solar cable right, every time.

Cable Size Calculator gives solar installers, electricians, and DIY builders instant, NEC-compliant wire sizing — voltage drop, ampacity, and derating handled in seconds.

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1.21%
NEC PASS · 12 AWG
What it does

Everything a solar wire run needs, in one tool.

From a single rooftop string to a full multi-segment system, size every conductor with confidence.

⚡

Instant Sizing

Enter voltage, current, and run length — get an NEC-compliant AWG recommendation instantly.

📊

Full AWG Matrix

Compare every wire gauge side-by-side: voltage drop, ampacity, power loss, and pass/fail status.

🛡️

NEC 690.8 Built-In

125% continuous-current multiplier, voltage drop thresholds, and derating factors, referenced in-app.

🔌

Multi-Segment Projects

Aggregate DC array runs, battery interconnects, and inverter AC lines into one project report.

🧵

Copper & Aluminum

Switch conductor material instantly and see how it changes your recommended gauge and losses.

✨

Optional AI Assistant

Bring your own API key (Gemini, OpenAI, Groq, Anthropic) for extra structural design advice.

125%
Continuous current multiplier (NEC 690.8)
≤ 2%
Recommended DC voltage drop target
3–5%
NEC branch / total system drop threshold

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Privacy policy

Privacy Policy — Cable Size Calculator ⚡ Cable Size Calculator ← Back to site Legal Privacy Policy Effective date: August 2, 2026 This Privacy Policy explains how Cable Size Calculator ("the App", "we", "us") handles information when you use our Android application. We built this app to work primarily offline and on-device, and we keep data collection to what's necessary to operate the app and its optional features. On-device data Calculator inputs & saved projects Voltage, current, distance, conductor material, and other values you enter into the calculator are processed locally on your device to generate wire-sizing results. If you save a project (using the Projects feature), that data is stored locally in the app's on-device database (Room). We do not upload your saved projects to our own servers. Optional feature BYOK AI Assistant (Bring...
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