User wants to design a battery isolation system that connects two car batteries in parallel only during starting and recharging, but does not know what size relay or solenoid is needed to handle starter current.

No specific existing solution mentioned, but user is seeking technical advice on component sizing, implying lack of clear guidelines for DIY battery isolation.

Severity

2Mild

Willingness to Pay

none

Added

May 4, 2026

App Concept

AutoBatt Pro Sizing Guide

An interactive web app that helps DIY car enthusiasts and mechanics select the correct relay or solenoid for dual-battery isolation systems based on engine size, battery specs, and starter current draw. It provides component recommendations and wiring diagrams instantly.

Key Features

Input engine type, battery specs, and starter type to calculate required relay/solenoid current rating
Generate wiring diagrams for common dual-battery setups (isolated, parallel, charging)
Database of compatible relays, solenoids, and battery isolators with purchase links
Community Q&A and verified installation guides

Target Users: DIY car enthusiasts and small auto repair shops working on custom dual-battery setups for overlanding, off-road, or work vehicles.

Revenue Model: Freemium: basic calculations free, $4.99 for detailed wiring diagrams and component discounts, or $9.99/mo subscription for unlimited access and community features.

Want to go deeper?

Sign up to save ideas, run AI analysis, and track opportunities in your personal workspace. Founding members get full access.

Join Beta

Solutions (0)

Discussion (0)

No comments yet