New EV charger shows PE Fault error despite installed grounding rod; need to reduce ground resistance to ≤4 ohms.

No easy way to measure ground resistance or know if bonding multiple rods will achieve the required ≤4 ohms.

Opp. Score

Severity

4High

Willingness to Pay

implied

Added

May 19, 2026

Workarounds Described

installed a 5ft grounding rod but still getting error
ordered a longer 10ft rod to try
considering bonding multiple rods of different lengths together
can turn off the PE fault error via software but wants proper solution

Implied Software Gaps

App that tells you exactly what ground resistance is needed and how to achieve it with rod depth and bonding

App Concept

GroundResist Pro

A mobile app that guides users through proper grounding installation for EV chargers, including resistance measurement recommendations, rod depth calculations, and bonding configurations. Connects to a low-cost ground resistance tester accessory (via Bluetooth) to give real-time readings and pass/fail status.

Key Features

Step-by-step grounding installation wizard with local soil type adjustments
Bluetooth-enabled resistance meter accessory to measure actual ground resistance
Bonding multiple rods: calculates optimal spacing and wire gauge based on target resistance
Regulatory compliance check for local standards (e.g., NEC, Philippine Electrical Code)

Target Users: Homeowners and electricians installing EV chargers in residential and commercial settings

Revenue Model: $14.99 one-time app purchase; optional $79.99 Bluetooth ground resistance tester accessory

Existing Solutions Mentioned

installed 5ft grounding rodordered 10ft grounding rod

Part of App Idea

New EV charger shows PE Fault error despite installed grounding rod; need to reduce ground resistance to ≤4 ohms.

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