Optimize small‑EV charging and battery life with an aftermarket CAN‑dash

Small urban EVs like Renault Twizy–style microcars and light quadricycles suffer from crude charging controls, limited battery‑life management and no built‑in way to prioritise rooftop solar or optimise cell aging; those problems are faced by an estimated 2.0M eligible vehicles globally, urban commuters and small shared fleets who are price‑sensitive and more likely to retrofit than replace. Owners report degraded range and fast battery wear, and OEM updates for these low‑volume models are infrequent, leaving a clear gap for an aftermarket solution. You could build an aftermarket CAN‑dash: a compact CAN‑bus interface plus dashboard and cloud platform that implements PV‑aware smart charging, adaptive charge profiles to reduce degradation, telematics and OTA firmware updates, bundled as a device+service product at roughly $600 average. The market is timely — a $1.2B TAM (2.0M vehicles × $600), a market attractiveness score of 88/100 and an 82/100 revenue potential — driven by growing retrofit demand, accelerating residential solar adoption and the normalization of connected vehicle modules. To stand out you need vehicle‑specific CAN reverse‑engineering, validated battery state‑of‑health algorithms, a robust PV‑first charging scheduler and enterprise interfaces for fleet operators, plus clear safety certifications and field validation. Strengths include low direct competition and recurring revenue potential from OTA and analytics subscriptions; the real challenges are fragmented CAN implementations across models, certification and warranty/legal risk, and the upfront engineering and testing investment required to prove safety and ROI. If you can commit to rigorous engineering, compliance and a few anchor fleet partners, this is a practical niche with measurable unit economics and recurring service upside.