# Solar Wire Sizer — NEC 690.8 Wire Sizer

> NEC 690.8 Wire Sizer (iPhone/iPad app by Rizvan Adzhoian.)

- Source: https://appshunter.io/ios/app/solar-wire-sizer/id6767838384 (this page in markdown: same URL + `.md`)
- Developer: [Rizvan Adzhoian](https://appshunter.io/developer/1891746079)
- Category: Utilities, Business
- Price: $0.99 with in-app purchases
- Age rating: 17+
- Requires: iOS 13.0 · 32 MB
- Languages: American English
- Released: 2026-05-11
- Data updated: 2026-09-08
- User reviews in markdown: https://appshunter.io/ios/app/solar-wire-sizer/id6767838384/reviews.md

## What is Solar Wire Sizer?

Solar Wire Sizer helps solar energy professionals select the correct wire size for PV systems based on NEC standards.

FEATURES:
- Wire sizing per NEC Table 310.16 ampacity ratings
- Max circuit current per NEC 690.8(A)(1): Isc x 1.25, then both printed 690.8(B) checks: base ampacity vs 156%, corrected ampacity vs 125%
- Voltage drop calculation with configurable thresholds (2-3%)
- Temperature derating per NEC Table 310.15(B)(1)
- Copper and aluminum conductor support
- DC, AC single-phase, and AC three-phase circuits
- 60C, 75C, and 90C insulation temperature ratings
- Wire sizes from 14 AWG to 500 kcmil

NEC COMPLIANCE:
- NEC 690.8(A),(B)(1),(B)(2) - PV circuit current and two-step conductor ampacity
- NEC 690.31 - Methods permitted for PV wiring
- NEC Table 310.16 - Allowable ampacities of insulated conductors
- NEC Table 310.15(B)(1) - Ambient temperature correction factors
- NEC Chapter 9 Table 8 - DC resistance values

OPTIONAL PRO UPGRADE - $2.99 ONE-TIME IN-APP PURCHASE
The following features require a separate one-time in-app purchase. They are not required to use the calculator:
- Unlimited saved calculation history
- PDF export of results
- Dark theme
- Ad-free experience

UPGRADE TO PRO:
- Remove banner ads
- Unlimited calculations
- Dark theme support

Designed for solar installers, electricians, and PV system designers working in the United States.

## Pricing and in-app purchases

Base price: $0.99.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Pro Unlock | $2.99 | one-time |



## Version history (last 3 releases)

### 1.0.2 — 2026-06-12

Conductor sizing now follows the printed two-step NEC 690.8(B) check:
- (B)(1) base ampacity vs 156% of Isc, (B)(2) corrected ampacity vs 125% - no more over-derating on hot or bundled runs
- Voltage drop now computed at 125% max circuit current (was 156%)
- Aluminum 300 kcmil corrected to printed 310.16 values (195/260 A)

### 1.0.1 — 2026-05-14

- Fixed cross-app links: tapping another SolarTools app in More Tools now opens its App Store page on iPhone and iPad.
- Minor stability improvements.

### 1.0.0 — 2026-05-11

No release notes.

## More apps by Rizvan Adzhoian

- [Conduit Fill Calculator-NEC](https://appshunter.io/ios/app/conduit-fill-calculator-nec/id6761846849)
- [Electrical Load Calc NEC](https://appshunter.io/ios/app/electrical-load-calc-nec/id6763250945)
- [Transformer Calc NEC](https://appshunter.io/ios/app/transformer-calc-nec/id6763311943)
- [Voltage Drop Calc NEC](https://appshunter.io/ios/app/voltage-drop-calc-nec/id6763312448)
- [Grounding Size Calc NEC](https://appshunter.io/ios/app/grounding-size-calc-nec/id6763312724)
- [Breaker Size Calc NEC](https://appshunter.io/ios/app/breaker-size-calc-nec/id6763312865)

All apps by Rizvan Adzhoian: https://appshunter.io/developer/1891746079

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-08.*