EV Range vs. Tennessee Road Trip Planner

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EV Range vs. Tennessee Road Trip Planner

Plan your Tennessee road trip with your electric vehicle. Enter your EV specs and route details to calculate how many charging stops you'll need, total charging time, and estimated trip duration across Tennessee's highways and terrain.

### Vehicle & Battery

EPA Rated Range (miles)

Your EV's official EPA range rating

Battery Capacity (kWh)

Usable battery capacity

Current State of Charge (%)

Battery charge at trip start

DC Fast Charger Speed (kW)

Max DC fast charge rate your EV accepts

### Trip Details

Total Trip Distance (miles)

e.g. Nashville to Memphis ~210 mi, Nashville to Knoxville ~180 mi

Average Highway Speed (mph)

Typical Tennessee interstate speed 65–75 mph

Terrain Type

Flat (West TN — Memphis area) Rolling Hills (Middle TN — Nashville area) Mountainous (East TN — Smoky Mountains)

Terrain affects energy consumption

Climate / HVAC Usage

Mild (Spring/Fall, minimal HVAC) Hot (Summer, A/C heavy use) Cold (Winter, heat + battery loss)

Tennessee summers are hot and humid

Arrival Reserve SOC (%)

Minimum charge to arrive at each stop (recommended: 10–15%)

Charge To SOC at Each Stop (%)

Target SOC after each charging stop (80% recommended for speed)

Plan My Trip

function evCalc() { // --- Gather Inputs --- const epaRange = parseFloat(document.getElementById('ev-epa-range').value); const batteryKwh = parseFloat(document.getElementById('ev-battery-capacity').value); const currentSoc = parseFloat(document.getElementById('ev-current-soc').value); const chargerKw = parseFloat(document.getElementById('ev-charger-speed').value); const tripMiles = parseFloat(document.getElementById('ev-trip-distance').value); const avgSpeed = parseFloat(document.getElementById('ev-avg-speed').value); const terrain = document.getElementById('ev-terrain').value; const climate = document.getElementById('ev-climate').value; const reserveSoc = parseFloat(document.getElementById('ev-reserve-soc').value); const chargeToSoc = parseFloat(document.getElementById('ev-charge-to-soc').value);

const resultDiv = document.getElementById('ev-result');

// --- Validation --- const errors = []; if (isNaN(epaRange) || epaRange 600) errors.push("EPA range must be 50–600 miles."); if (isNaN(batteryKwh) || batteryKwh 200) errors.push("Battery capacity must be 20–200 kWh."); if (isNaN(currentSoc) || currentSoc 100) errors.push("Current SOC must be 1–100%."); if (isNaN(chargerKw) || chargerKw 350) errors.push("Charger speed must be 7–350 kW."); if (isNaN(tripMiles) || tripMiles 2000) errors.push("Trip distance must be 1–2000 miles."); if (isNaN(avgSpeed) || avgSpeed 90) errors.push("Average speed must be 30–90 mph."); if (isNaN(reserveSoc) || reserveSoc 30) errors.push("Reserve SOC must be 5–30%."); if (isNaN(chargeToSoc) || chargeToSoc 100) errors.push("Charge-to SOC must be 20–100%."); if (!isNaN(reserveSoc) && !isNaN(chargeToSoc) && chargeToSoc 0) { resultDiv.style.display = 'block'; resultDiv.innerHTML = 'Please fix the following:' + errors.map(e => '').join('') + ''; return; }

// --- Terrain Efficiency Multiplier --- // Flat: minimal grade impact; Rolling: moderate; Mountainous: significant const terrainMultiplier = { flat: 1.00, rolling: 1.08, mountainous: 1.18 }[terrain];

// --- Climate Efficiency Multiplier --- // Hot summer A/C in Tennessee can reduce range 10–20%; cold reduces 15–25% const climateMultiplier = { mild: 1.00, hot: 1.14, cold: 1.22 }[climate];

// --- Speed Efficiency Multiplier --- // Aerodynamic drag increases with speed squared; EPA tested ~55 mph blend // At 70 mph, real-world range ~10–15% less than EPA; at 75 mph ~15–20% less const speedMultiplier = 1 + Math.pow((avgSpeed - 55) / 55, 2) * 0.85;

// --- Combined Real-World Efficiency Factor --- const efficiencyFactor = terrainMultiplier * climateMultiplier * speedMultiplier;

// --- Real-World Range (miles) --- // realRange = epaRange / efficiencyFactor const realRange = epaRange / efficiencyFactor;

// --- Energy Consumption Rate (kWh/mile) --- const kwhPerMile = batteryKwh / realRange;

// --- Usable Range per Charge Cycle --- // From chargeToSoc down to reserveSoc const usableSocSwing = (chargeToSoc - reserveSoc) / 100; const usableKwh = batteryKwh * usableSocSwing; const rangePerCharge = usableKwh / kwhPerMile; // miles per charge cycle

// --- Starting Usable Range --- const startUsableSoc = (currentSoc - reserveSoc) / 100; const startUsableKwh = batteryKwh * Math.max(startUsableSoc, 0); const startRangeAvail = startUsableKwh / kwhPerMile;

// --- Number of Charging Stops --- // After first leg (startRangeAvail), remaining distance covered in rangePerCharge chunks let chargingStops = 0; let remainingMiles = tripMiles;

if (startRangeAvail >= remainingMiles) { chargingStops = 0; } else { remainingMiles -= startRangeAvail; chargingStops = Math.ceil(remainingMiles / rangePerCharge); }

// --- Total Charging Time --- // Each stop: charge from reserveSoc to chargeToSoc // Charging time (hours) = kWh to add / effective charger kW // DC fast chargers slow above 80% SOC — apply taper factor if chargeToSoc > 80% const kwhToAddPerStop = usableKwh; let effectiveChargerKw = chargerKw; if (chargeToSoc > 80) { // Taper: above 80% SOC, average effective rate drops ~35% const taperFraction = (chargeToSoc - 80) / (chargeToSoc - reserveSoc); effectiveChargerKw = chargerKw * (1 - taperFraction * 0.35); } const chargingTimePerStop = kwhToAddPerStop / effectiveChargerKw; // hours const totalChargingHours = chargingStops * chargingTimePerStop;

// --- Driving Time --- const drivingHours = tripMiles / avgSpeed;

// --- Total Trip Time --- // Add 10 min (0.167 hr) overhead per charging stop (parking, plugging in, etc.) const stopOverheadHours = chargingStops * (10 / 60); const totalTripHours = drivingHours + totalChargingHours + stopOverheadHours;

// --- Final SOC at Destination --- // Miles driven on last segment after final charge (or from start if no stops) let lastSegmentMiles; if (chargingStops === 0) { lastSegmentMiles = tripMiles; } else { const milesAfterFirstLeg = tripMiles - startRangeAvail; const fullStops = Math.floor(milesAfterFirstLeg / rangePerCharge); lastSegmentMiles = milesAfterFirstLeg - fullStops * rangePerCharge; } const lastSegmentKwh = lastSegmentMiles * kwhPerMile; const lastStartKwh = chargingStops > 0 ? batteryKwh * (chargeToSoc / 100) : batteryKwh * (currentSoc / 100); const arrivalKwh = Math.max(lastStartKwh - lastSegmentKwh, 0); const arrivalSoc = (arrivalKwh / batteryKwh) * 100;

// --- Format Helpers --- function fmtHours(h) { const hrs = Math.floor(h); const mins = Math.round((h - hrs) * 60); if (hrs === 0) return mins + ' min'; if (mins === 0) return hrs + ' hr'; return hrs + ' hr ' + mins + ' min'; }

function fmtNum(n, dec) { return n.toFixed(dec); }

// --- Terrain / Climate Labels --- const terrainLabel = { flat: 'Flat (West TN)', rolling: 'Rolling Hills (Middle TN)', mountainous: 'Mountainous (East TN)' }[terrain]; const climateLabel = { mild: 'Mild (Spring/Fall)', hot: 'Hot Summer (A/C)', cold: 'Cold Winter' }[climate];

// --- Charging Stop Breakdown --- let stopRows = ''; if (chargingStops > 0) { let cumMiles = startRangeAvail; stopRows += 'Stop #Approx. Mile MarkerCharge Added (kWh)Charge Time'; for (let i = 1; i ' + i + '~' + stopMile + ' mi' + fmtNum(kwhToAddPerStop, 1) + ' kWh' + fmtHours(chargingTimePerStop) + ''; cumMiles += rangePerCharge; } }

// --- Result HTML --- resultDiv.style.display = 'block'; resultDiv.innerHTML = ` ### ⚡ Trip Summary

Real-World Range ${fmtNum(realRange, 0)} mi vs. ${epaRange} mi EPA rated

Efficiency Factor ${fmtNum(efficiencyFactor * 100 - 100, 1)}% penalty ${fmtNum(kwhPerMile * 1000, 0)} Wh/mile actual

Charging Stops Needed ${chargingStops} ${chargingStops === 0 ? 'You can make it on one charge!' : 'DC fast charge stops'}

Total Charging Time ${fmtHours(totalChargingHours)} ${fmtHours(chargingTimePerStop)} per stop

Driving Time ${fmtHours(drivingHours)} at ${avgSpeed} mph avg

Total Trip Time ${fmtHours(totalTripHours)} drive + charge + stop overhead

Arrival SOC ${fmtNum(arrivalSoc, 1)}% ${fmtNum(arrivalKwh, 1)} kWh remaining

Total Energy Used ${fmtNum(tripMiles * kwhPerMile, 1)} kWh for ${tripMiles} miles

${chargingStops > 0 ? ` #### Charging Stop Breakdown

${stopRows}

` : ''}

Conditions Applied: Terrain: ${terrainLabel} (×${fmtNum(terrainMultiplier, 2)})  |  Climate: ${climateLabel} (×${fmtNum(climateMultiplier, 2)})  |  Speed: ${avgSpeed} mph (×${fmtNum(speedMultiplier, 2)})

Tennessee Context: Nashville→Memphis ≈ 210 mi  |  Nashville→Knoxville ≈ 180 mi  |  Nashville→Chattanooga ≈ 135 mi  |  Knoxville→Gatlinburg ≈ 35 mi

`; }

#### Formulas Used

1. Speed Efficiency Multiplier: Speed_Mult = 1 + ((avgSpeed − 55) / 55)² × 0.85 Aerodynamic drag force ∝ v²; energy consumption rises sharply above EPA test speed (~55 mph blend).

2. Combined Efficiency Factor: EfficiencyFactor = Terrain_Mult × Climate_Mult × Speed_Mult

3. Real-World Range: RealRange (mi) = EPA_Range / EfficiencyFactor

4. Energy Consumption Rate: kWh/mile = Battery_kWh / RealRange

5. Usable Range Per Charge Cycle: UsableKWh = Battery_kWh × (ChargeToSOC − ReserveSOC) / 100 RangePerCharge = UsableKWh / (kWh/mile)

6. Charging Stops: StartRange = Battery_kWh × (CurrentSOC − ReserveSOC) / 100 / (kWh/mile) If StartRange ≥ TripMiles → 0 stops Else: Stops = ⌈(TripMiles − StartRange) / RangePerCharge⌉

7. Charging Time Per Stop (with taper above 80% SOC): If ChargeToSOC > 80%: EffectiveKW = ChargerKW × (1 − TaperFraction × 0.35) ChargingTime (hr) = UsableKWh / EffectiveKW

8. Total Trip Time: TotalTime = (TripMiles / AvgSpeed) + (Stops × ChargingTime) + (Stops × 10 min overhead)

#### Assumptions & References

More Calculators

References

Related Authorities

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