EV calc model

Written by chivey on July 5, 2026 Tags: Design

EV calc (http://www.evconvert.com/tools/evcalc/) model of the StealthBus.

Summary

ConfigurationRange @ 30 mphRange @ 60 mphTop speed (Limit)
Lead pack / Logisystems43.625.7
GBS pack / Solition Jr48.529.0
Tesla pack / Solition Jr96.756.074 (Battery Voltage)

Vehicle (1973 Volkswagen Bus)

Drag Coeff0.38
Frontal Area27
Initial Curb Wt2900
Drive efficiency0.91
1st gear ratio17.366
2nd gear ratio9.40963
3rd gear ratio5.76277
4th gear ratio4.06273
Final ratio4.57

From various VW specifications

Motor (Net Gain – Warp 9)

Voltage192
Weight135
Horse Power35
Maximum RPM5000
Motor a46239
Motor b0.4564
Motor c2436
Motor d303
Motor k0.0069
Motor n1.5845

Standard model from EV Calc tool.

Battery (GBS)

Voltage12.8
Weight
Puekerts Exp100
Puekerts Cap1.05
Resistance0.006

Battery (Tesla 5.3kWh)

Voltage22.8
Weight55
Puekerts Exp232
Puekerts Cap1.05
Resistance0.006

System

Voltage144
# Batt Strings1
% DOD100
Charger Weight20
lbs Removed600
Misc Added lbs500
Incline1
Wind0
Tire Section195
Tire Aspect50
Tire Rim15
Rolling Resistance0.015
Brake/Steer Resistance0.003
Kwh Rate0.09
Commute Miles20

Battery Pack (C&D Tech Max Rate AGM 138Ah)

Voltage12.8
Weight100
Puekerts Exp1.082
Puekerts Cap163.244
Resistance0.0023

From C&D datasheet, converted to Puekerts using EV calc tools.

Controller (Logisystems AFX 156)

min voltage120
max voltage156
max current750
weight20
efficiency95

From Logisystems datasheet