EV Charging GuideCharging CostThe Cheapest Charging Strategy: When, Where, and How Much to Charge
The Cheapest Charging Strategy: When, Where, and How Much to Charge
Maximize your EV savings with a smart charging strategy that combines off-peak timing, optimal SOC windows, and the right mix of home and public charging.
Try it with your car
Use our free calculator to simulate your exact charging time and cost.
The single biggest money-saving move for EV owners is shifting all home charging to off-peak electricity hours. In most European countries, off-peak rates (typically 10 PM to 6 AM) are 20-40% cheaper than daytime rates. On France's HP/HC tariff, you might pay €0.18/kWh off-peak versus €0.25/kWh during peak hours. Over a year of daily charging, that difference adds up to €200-€400 in savings.
The Cheapest Charging Strategy: When, Where, and How Much to Charge
Setting up scheduled charging takes five minutes and pays dividends forever. In your car's infotainment system or your wallbox app, set charging to begin at the start of your off-peak window. Most EVs let you set departure times so the car is charged and preconditioned exactly when you need it. Preconditioning while plugged in also uses grid power instead of battery power, preserving range.
For drivers on dynamic or real-time pricing tariffs (like Tibber or Octopus Agile), smart chargers can automatically shift charging to the absolute cheapest hours of the night. Some nights electricity drops to €0.05/kWh or even goes negative. These tariffs require more engagement but can cut charging costs by 50-70% compared to flat-rate contracts.
Optimal SOC Windows for Cost Efficiency
Charging between 20% and 80% SOC is the sweet spot for both battery health and cost efficiency. Below 20%, some EVs slightly increase consumption to protect the battery. Above 80%, charging speed drops dramatically on DC fast chargers, meaning you pay more per kWh on time-based billing and spend more time occupying a charger (risking idle fees).
On home AC charging, the SOC window matters less for cost per kWh since you pay the same rate regardless of charging speed. However, keeping your battery between 20-80% for daily driving extends battery longevity, which protects your biggest investment: the battery pack itself. A battery replacement costs €5,000-€15,000 depending on the vehicle, so preserving capacity is a genuine cost consideration.
For DC fast charging, the cost difference is significant. Charging a Hyundai Ioniq 5 from 20% to 80% on a 150 kW charger takes about 18 minutes. Charging from 80% to 100% takes an additional 25+ minutes. If you're paying €0.50/kWh, the energy from 80-100% costs roughly the same per kWh, but on time-based networks, the slower speed means each kWh in that upper range costs substantially more. The Plan EV Charge calculator visualizes this charging curve so you can see exactly where diminishing returns kick in.
Home vs Public Charging: Cost Analysis
For daily commuting, home charging is unbeatable on cost. A typical commute of 40 km/day uses about 7 kWh. At home rates of €0.20/kWh, that's €1.40/day or €42/month. The same energy at a public AC charger (€0.35/kWh) costs €73.50/month, and at a DC fast charger (€0.55/kWh) it's €115.50/month. Home charging saves €375-€882 per year just on commuting.
The economics shift on long trips. Home charging isn't available, and you need DC fast chargers for practical journey times. Budget €0.40-€0.65/kWh for highway fast charging. A 500 km trip in a car consuming 18 kWh/100 km needs about 90 kWh total, costing €36-€58.50 in charging. Plan your stops at cheaper networks and charge just enough at each stop to reach the next affordable charger.
Workplace charging is the hidden gem. If your employer offers free or subsidized charging, it effectively eliminates your commuting energy cost entirely. Even paid workplace charging at €0.25/kWh is competitive with home rates and eliminates the need for a home wallbox. If you don't have home charging, advocate for workplace charging as it benefits both employees and employers (through tax incentives in many countries).
Combining Strategies for Maximum Savings
The optimal charging strategy layers multiple approaches. For daily driving, charge at home during off-peak hours to 80% SOC. If you have solar panels, top up during peak solar hours when your panels generate excess power. This combination can bring your effective cost below €0.10/kWh in sunny months, rivaling the cost of running a bicycle.
For road trips, plan your charging stops using the Plan EV Charge calculator and a route planner. Identify the cheapest chargers along your route, charge to only 60-70% at expensive highway chargers (just enough to reach a cheaper option), and do your big charge at destination or at more affordable off-highway locations. Hotel destination chargers are often free or cheap, and charging overnight means you start each day with a full battery.
Track everything for at least three months. Record every charging session: location, cost, kWh, time of day. After three months you'll have clear data on your actual blended rate and can identify optimization opportunities. Many drivers discover they're spending 30-40% more than necessary simply because they haven't optimized their routine. The Plan EV Charge session logger automates this tracking and helps surface insights about your charging patterns.
Using Cost Optimization Tools
The Plan EV Charge calculator is your primary tool for cost optimization. By simulating charges at different power levels, SOC ranges, and electricity prices, you can quantify the cost impact of every decision. Want to know if charging to 90% instead of 80% is worth it before a long trip? The calculator shows you the extra time, energy, and cost for those additional percentage points.
Beyond the calculator, route planning apps like A Better Route Planner (ABRP) integrate real-time charger pricing to find the cheapest stops along your route. Charging network apps (Chargemap, PlugShare) show user-reported prices and help you avoid overpriced stations. Combine these with the Plan EV Charge session logger to build a personal database of reliable, affordable charging spots.
For home charging optimization, consider a smart energy management system that coordinates your EV charger with solar panels, home battery, and grid tariffs. Systems from myenergi (Zappi), Ohme, or Easee can automatically charge your car at the cheapest possible rate while respecting your departure time. The upfront investment of €300-€800 for a smart charger typically pays for itself within 1-2 years through electricity savings.
