EV Home Charging Cost Calculator (Arizona APS/SRP Rate Plans)

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EV Home Charging Cost Calculator (Arizona APS/SRP Rate Plans)

Estimate your monthly electric vehicle home charging costs under Arizona Public Service (APS) and Salt River Project (SRP) rate plans, including standard, time-of-use (TOU), and EV-specific rates.

Vehicle Efficiency (miles per kWh)

Typical range: 2.5–4.5 mi/kWh. Check your vehicle specs or EPA label.

Miles Driven Per Month

Average US driver: ~1,100 miles/month.

Charger Efficiency (%)

Level 2 chargers: ~85–95%. Level 1: ~80–85%.

Utility Provider

APS (Arizona Public Service) SRP (Salt River Project)

Rate Plan

-- Select Utility First --

% of Charging Done Off-Peak

Off-peak hours vary by plan. See plan details below.

Charger Power (kW)

Level 1: ~1.4 kW | Level 2: 3.3–11.5 kW. Required for demand-charge plans.

Calculate Monthly Charging Cost

(function() { // Rate plan data (2024 approximate rates — verify with utility for current tariffs) const ratePlans = { aps: { "aps-flat": { label: "APS Saver Choice (Flat Rate)", desc: "Simple flat rate, no time-of-use. ~$0.1289/kWh (Tier 1, summer). Best for daytime charging.", tou: false, demand: false, // Summer (Jun–Sep) / Winter (Oct–May) blended flat rate summerRate: 0.1289, winterRate: 0.1089, offPeakRate: null, onPeakRate: null, demandCharge: 0, offPeakHours: "" }, "aps-tou": { label: "APS Saver Choice Plus (TOU)", desc: "Time-of-use: On-peak 3–8 PM weekdays. Off-peak ~$0.0889/kWh, On-peak ~$0.2289/kWh (summer).", tou: true, demand: false, summerOnPeak: 0.2289, summerOffPeak: 0.0889, winterOnPeak: 0.1389, winterOffPeak: 0.0789, demandCharge: 0, offPeakHours: "Off-peak: 8 PM – 3 PM weekdays, all day weekends & holidays." }, "aps-ev": { label: "APS EV Advantage (EV-Specific TOU)", desc: "EV-specific plan. Super off-peak midnight–6 AM ~$0.0489/kWh. On-peak 3–8 PM ~$0.2489/kWh (summer).", tou: true, demand: false, summerOnPeak: 0.2489, summerOffPeak: 0.0489, winterOnPeak: 0.1289, winterOffPeak: 0.0489, demandCharge: 0, offPeakHours: "Super off-peak: midnight–6 AM daily. On-peak: 3–8 PM weekdays (summer)." }, "aps-tou-demand": { label: "APS Saver Choice Peak (TOU + Demand)", desc: "TOU with demand charge. Off-peak ~$0.0689/kWh, On-peak ~$0.1889/kWh + $8.00/kW demand (summer).", tou: true, demand: true, summerOnPeak: 0.1889, summerOffPeak: 0.0689, winterOnPeak: 0.1089, winterOffPeak: 0.0589, demandCharge: 8.00, offPeakHours: "Off-peak: 8 PM – 3 PM weekdays, all day weekends. Demand charge applies to peak kW used." } }, srp: { "srp-flat": { label: "SRP Basic (Flat Rate)", desc: "Standard flat rate ~$0.1089/kWh (E-13 plan, blended). Simple, no time restrictions.", tou: false, demand: false, summerRate: 0.1189, winterRate: 0.0989, offPeakRate: null, onPeakRate: null, demandCharge: 0, offPeakHours: "" }, "srp-tou": { label: "SRP Time-of-Use (E-26)", desc: "TOU plan. On-peak 2–8 PM weekdays (summer) ~$0.2589/kWh. Off-peak ~$0.0789/kWh.", tou: true, demand: false, summerOnPeak: 0.2589, summerOffPeak: 0.0789, winterOnPeak: 0.1289, winterOffPeak: 0.0689, demandCharge: 0, offPeakHours: "Off-peak: 8 PM – 2 PM weekdays, all day weekends & holidays (summer)." }, "srp-ev": { label: "SRP EV Price Plan (E-23)", desc: "EV-specific TOU. Super off-peak 11 PM–5 AM ~$0.0389/kWh. On-peak 2–8 PM ~$0.2689/kWh (summer).", tou: true, demand: false, summerOnPeak: 0.2689, summerOffPeak: 0.0389, winterOnPeak: 0.1189, winterOffPeak: 0.0389, demandCharge: 0, offPeakHours: "Super off-peak: 11 PM–5 AM daily. On-peak: 2–8 PM weekdays (summer)." }, "srp-tou-demand": { label: "SRP Time-of-Use with Demand (E-27)", desc: "TOU + demand charge. Off-peak ~$0.0589/kWh, On-peak ~$0.1789/kWh + $9.50/kW demand (summer).", tou: true, demand: true, summerOnPeak: 0.1789, summerOffPeak: 0.0589, winterOnPeak: 0.0989, winterOffPeak: 0.0489, demandCharge: 9.50, offPeakHours: "Off-peak: 8 PM – 2 PM weekdays, all day weekends. Demand charge on peak kW." } } };

const utilitySelect = document.getElementById('ev-utility'); const ratePlanSelect = document.getElementById('ev-rate-plan'); const ratePlanDesc = document.getElementById('ev-rate-plan-desc'); const touGroup = document.getElementById('ev-tou-group'); const demandGroup = document.getElementById('ev-demand-group');

function populatePlans() { const utility = utilitySelect.value; ratePlanSelect.innerHTML = ''; const plans = ratePlans[utility]; for (const key in plans) { const opt = document.createElement('option'); opt.value = key; opt.textContent = plans[key].label; ratePlanSelect.appendChild(opt); } updatePlanUI(); }

function updatePlanUI() { const utility = utilitySelect.value; const planKey = ratePlanSelect.value; if (!planKey || !ratePlans[utility]) return; const plan = ratePlans[utility][planKey]; ratePlanDesc.textContent = plan.desc; touGroup.style.display = plan.tou ? 'block' : 'none'; demandGroup.style.display = plan.demand ? 'block' : 'none'; }

utilitySelect.addEventListener('change', populatePlans); ratePlanSelect.addEventListener('change', updatePlanUI); populatePlans();

window.evCalc = function() { const resultDiv = document.getElementById('ev-result'); resultDiv.style.display = 'none';

// Inputs const efficiency = parseFloat(document.getElementById('ev-vehicle-efficiency').value); const miles = parseFloat(document.getElementById('ev-miles-per-month').value); const chargerEff = parseFloat(document.getElementById('ev-charger-efficiency').value); const utility = utilitySelect.value; const planKey = ratePlanSelect.value; const offPeakPct = parseFloat(document.getElementById('ev-offpeak-pct').value) || 80; const chargerKw = parseFloat(document.getElementById('ev-charger-kw').value) || 7.2;

// Validation const errors = []; if (isNaN(efficiency) || efficiency 10) errors.push("Vehicle efficiency must be between 1 and 10 mi/kWh."); if (isNaN(miles) || miles 5000) errors.push("Miles per month must be between 1 and 5,000."); if (isNaN(chargerEff) || chargerEff 100) errors.push("Charger efficiency must be between 50% and 100%."); if (!planKey) errors.push("Please select a rate plan."); if (ratePlans[utility][planKey] && ratePlans[utility][planKey].tou) { if (isNaN(offPeakPct) || offPeakPct 100) errors.push("Off-peak charging percentage must be between 0 and 100."); } if (ratePlans[utility][planKey] && ratePlans[utility][planKey].demand) { if (isNaN(chargerKw) || chargerKw 20) errors.push("Charger power must be between 1 and 20 kW."); }

if (errors.length > 0) { resultDiv.style.display = 'block'; resultDiv.innerHTML = 'Please fix the following:' + errors.map(e => '').join('') + ''; return; }

const plan = ratePlans[utility][planKey];

// Core formula: // kWh needed from grid = (miles / efficiency) / (chargerEff / 100) const kWhFromVehicle = miles / efficiency; const kWhFromGrid = kWhFromVehicle / (chargerEff / 100);

// Determine season split (Arizona: summer Jun–Sep = 4 months, winter = 8 months) const summerFraction = 4 / 12; const winterFraction = 8 / 12;

let summerCost = 0; let winterCost = 0; let demandCost = 0; let effectiveSummerRate = 0; let effectiveWinterRate = 0;

if (!plan.tou) { // Flat rate effectiveSummerRate = plan.summerRate; effectiveWinterRate = plan.winterRate; summerCost = kWhFromGrid * plan.summerRate; winterCost = kWhFromGrid * plan.winterRate; } else { // TOU: blend on-peak and off-peak const offPeakFrac = offPeakPct / 100; const onPeakFrac = 1 - offPeakFrac;

effectiveSummerRate = (offPeakFrac * plan.summerOffPeak) + (onPeakFrac * plan.summerOnPeak); effectiveWinterRate = (offPeakFrac * plan.winterOffPeak) + (onPeakFrac * plan.winterOnPeak);

summerCost = kWhFromGrid * effectiveSummerRate; winterCost = kWhFromGrid * effectiveWinterRate;

// Demand charge (summer only for most AZ plans) if (plan.demand) { // Demand charge = charger kW * $/kW (summer months only) demandCost = chargerKw * plan.demandCharge * summerFraction; // Add winter demand (typically lower or zero — using 50% of summer rate for winter) // Most AZ plans only have summer demand charges; winter demand is minimal } }

// Weighted monthly average cost const energyCostMonthly = (summerCost * summerFraction) + (winterCost * winterFraction); const totalMonthly = energyCostMonthly + demandCost; const totalAnnual = totalMonthly * 12; const costPerMile = totalMonthly / miles; const effectiveRate = totalMonthly / kWhFromGrid;

// Summer-only and winter-only monthly costs for display const summerMonthly = summerCost + (plan.demand ? chargerKw * plan.demandCharge : 0); const winterMonthly = winterCost;

resultDiv.style.display = 'block'; resultDiv.innerHTML = '### Monthly EV Charging Cost Estimate ' + '' + 'Miles per Month' + miles.toLocaleString() + ' mi' + 'Vehicle Energy Used' + kWhFromVehicle.toFixed(1) + ' kWh' + 'Grid Energy Required (incl. charger loss)' + kWhFromGrid.toFixed(1) + ' kWh' + 'Effective Summer Rate$' + effectiveSummerRate.toFixed(4) + '/kWh' + 'Effective Winter Rate$' + effectiveWinterRate.toFixed(4) + '/kWh' + (plan.demand ? 'Monthly Demand Charge (summer avg)$' + demandCost.toFixed(2) + '' : '') + 'Summer Month Cost$' + summerMonthly.toFixed(2) + '' + 'Winter Month Cost$' + winterMonthly.toFixed(2) + '' + 'Average Monthly Cost$' + totalMonthly.toFixed(2) + '' + 'Estimated Annual Cost$' + totalAnnual.toFixed(2) + '' + 'Cost per Mile$' + costPerMile.toFixed(4) + '/mi' + 'Effective Rate (all-in)$' + effectiveRate.toFixed(4) + '/kWh' + '' + (plan.offPeakHours ? 'Off-Peak Hours: ' + plan.offPeakHours + '

' : '') + '⚠️ Rates are approximate 2024 values. Verify current tariffs at aps.com or srpnet.com. Does not include base/service charges.

'; }; })();

#### Formulas Used

1. Grid Energy Required (kWh/month):

kWh_grid = (Miles ÷ Vehicle_Efficiency_mi_per_kWh) ÷ (Charger_Efficiency% ÷ 100)

2. Flat Rate Plans:

Monthly_Cost = kWh_grid × Rate_$/kWh

3. Time-of-Use Plans:

Effective_Rate = (Off_Peak% × Off_Peak_Rate) + (On_Peak% × On_Peak_Rate) Monthly_Cost = kWh_grid × Effective_Rate

4. TOU + Demand Charge Plans:

Monthly_Cost = (kWh_grid × Effective_Rate) + (Charger_kW × Demand_$/kW)

5. Seasonal Weighted Average:

Avg_Monthly = (Summer_Cost × 4/12) + (Winter_Cost × 8/12) Arizona summer = June–September (4 months); winter = October–May (8 months).

#### Assumptions & References

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