// Engineering Tools · engivoltpro.com
Audit Tools & Data Sources
Calculators and data sources used across EngiVolt Pro audits. All tools are free. All outputs use the same confidence label system as our published reports.
// TOOL-01 · EngiVolt Pro
C-Rate Calculator
kWh
V
kW
min
%
%
—
C
session average
session average
Thermal risk
Degradation risk per cycle
Audit note
// C-Rate Reference — LFP / LMFP Chemistry
1C or lessStandard overnight charging. Minimal degradation. Baseline for all cycle life warranties.
1C to 3CDC fast charging. Moderate thermal load. Well-characterised in peer-reviewed literature.
3C to 6CFlash charging range. BYD Gen 2 operates here (~5.8C avg). Long-term degradation: NOT PUBLISHED.
Above 6CExtreme rate. Lithium plating risk. No production vehicle sustains this across 10-80% SOC.
C-rate = charge power (kW) / battery capacity (kWh). Session-average C-rate = energy delivered / capacity / time (h).
Degradation thresholds: Casas-Cabanas et al., J. Power Sources 2025; Huang et al., Chem. Eng. Journal 2024.
BYD Gen 2 session-average ~5.8C from 800V Platform Audit.
// TOOL-02 · Data Source
EVCIPA Charging Network Database
China's official EV charging infrastructure statistics, published monthly by the Electric Vehicle Charging Infrastructure Promotion Alliance. The primary source for all charging network density claims on this site.
[V] Verified Source
Used in: 800V Platform Audit (infrastructure density figures), BYD Flash Charging Audit (public network coverage claim).Key data: Total public charging outlets, DC vs AC split, monthly additions, geographic distribution.
// TOOL-03 · Reference Standard
GB38031-2025 Battery Safety Standard
China's national standard for EV traction battery safety. Defines minimum cycle count requirements, thermal runaway test protocols, and post-cycle safety test procedures. Referenced directly in battery life audits.
[V] Verified Reference
Minimum standard: 300 fast-charge cycles before safety test.BYD Gen 2 tested at: 500 cycles (67% above minimum) + nail penetration while charging.
Used in: BYD Blade Battery Gen 2 Audit (battery life section).
// TOOL-04 · Checklist
Fleet EV Procurement Checklist
Three gates every fleet operator must clear before committing to EV procurement. Derived from audit findings across BYD Flash Charging and 800V Platform audits.
GATE 1 — Charging Infrastructure
Is there a compatible HPC station within 5 km of your primary operating base? Verify actual power rating — not advertised maximum. For BYD flash charging: confirm BYD Flash Charger specifically, not generic HPC.
GATE 2 — Route Coverage
For highway routes: is the route covered at 150 km intervals by operational HPC stations? Use session-average charge rate (not peak) to calculate session duration. Evaluate after May Day 2026 for BYD highway network.
GATE 3 — Climate & Duty Cycle
Does operating temperature regularly drop below -20°C? If yes: wait for Q4 2026 independent cold-weather test before committing. For flash charging fleets: long-term degradation data will not exist until 2027-2028. Use 77.5% at 6yr/150,000 km as TCO planning boundary.