Choose the power of your wallbox at home seems simple, but depends on three things that send: your electrical contract, if your housing is single-phase or three-phase and your driving habits, and load. Hit here saves you from unnecessary expenses, changes in supply and scares with the machine when you turn on your furnace and air at the same time.

In MiSolar install chargers residential in Javea and the Costa Blanca North, and, above all, integrate them with your pv to the car to “drink” of your surpluses whenever you can. In this guide, we give you a comparative clear of 3.7 kW to 7.4 kW and 11 kW, with actual speeds in km/h, electrical requirements, and when compensated to make the jump to three-phase.

If you want to go to the point: the majority of homes, single phase are overrun with 7.4 kW and load-balancing. The 11 kW only fits in if you already have three-phase or you're going to use the car for top-ups fast during the day.

The power of the charger determines the energy that goes into the battery each time. Convert it to km/h, it is useful for the day-to-day. As a rule, quick, a car that consumes 16-20 kWh/100 km wins:

-        3.7 kW: about 18-23 km per hour.

-        7,4 kW: about 35-45 km per hour.

-        11 kW (three phase): approximately 50-65 km per hour.

Translation practice: if you park 8 hours a night, 7.4 kW adds 280-360 km Even a 3.7 kW puts 140-180 km, enough for the week of many drivers.

Use this to estimate your km/h:

-        Km/h approximate = (Power of the charger (kW) / (energy Consumption in kWh/100 km) × 100.

-        Examples:

-        7,4 kW with 18 kWh/100 km: 7,4/18×100 ≈ 41 km/h.

-        3.7 kW with 16 kWh/100 km: 3,7/16×100 ≈ 23 km/h.

-        11 kW with 20 kWh/100 km: 11/20×100 ≈ 55 km/h.

If you already have plates, remember that the useful power to the car will depend on your surplus instant and the programming of the app from the inverter.

-        Single-phase: it is a common occurrence in homes. Supports shippers of 3.7 or 7,4 kW. To 7,4 kW, tends to become comfortable with powers contracted 5.75–6.9 kW in Spain if you use load balancing. Without balancing, you can skip the ICP when you match furnace, air conditioning and heat pump.

-        Three-phase: you need to 11 kW. If your house is already three-phase or you're thinking of aerothermal, swimming pool and other large consumption, it may make sense to distribute loads and to gain flexibility.

When compensates move to three-phase: typically when you already have or you are going to have several large consumers and concurrent need reloads faster on windows short, for example, you come at noon, connect 60-90 minutes and follow path. If loads of night and you can leave the car for several hours, a good 7,4 kW with balancing you resolve the same with less cost.

The load balancing measures the total consumption of the house and adjust the wallbox in real time to not exceed the limit that is hired. In order to avoid shots of the ICP when booting the air, the furnace or the heat pump. In practice, you will see that the charger goes up to 7.4 kW when there is margin and low to 2-3 kW if the house is “tiresome”. For many homes is the difference between extend power or not.

You should always install it by a licensed electrician according to the reglamento Electrotécnico para Baja Tension. For guidance:

-        Dedicated line from the box.

-        Magnetothermal and differential dedicated, curvature, and sensitivity according to the manufacturer and to the regulations in force. To 7,4 kW single-phase, the circuit breaker is usually in the environment of 40 A and a differential-type or F-type as recommended by the wallbox.

-        Cable cross-section dimensioned by power and distance. In short stretches, 6 mm2 to 7,4 kW is common; long distances may require 10 mm2 to limit voltage drop.

-        Grounded in correct values, and protections against overvoltages if the box is not included.

Note: these are general references, the final calculation depends on the length of cable, installation method, temperature, manufacturer, and local regulations. In garages community may require additional protections and communication to the community.

Where MiSolar brand difference is in the integration with your PV system:

-        Solar mode priority: the charger continues the surplus for the inverter and charge-only “solar” when you can, or in mixed mode limits the support network.

-        Schedules in the app of the investor: agenda windows to load when your plates give more or when your fee is cheaper. On the Costa Blanca, a strip 11:00-16:00 will usually be ideal in summer for charging with pv.

-        Virtual battery and surplus: if you want to maximize savings, we can help you set up agreements “battery” virtual and adjust the power of the wallbox to balance consumption with credit for export.

If you are looking for a broader view of self-consumption in the area, check out the page MiSolar in Spanish to know how we work in Javea and the Costa Blanca North. You will find real-life cases from customers and our focus on MiSolar. In addition, if you are weighing whether to expand your system with storage, you can see how we put the batteries to solar panels.

-        3.7 kW: ideal if you 20-40 km per day, loads for the night and your contract is adjusted. Cheap, simple, and enough for most people.

-        7,4 kW: the domestic well-balanced, single phase. Allows you to charge faster at night and take advantage of window solar. With sway, rarely you will need to upload contracted power.

-        11 kW: only if you have three-phase or you plan to put it and compensates for habits of loading of short duration or number EV at home. Does not accelerate beyond what is supported by the built-in charger of your car, always confirms the onboard charger of your model.

On the Costa Blanca North, a single family home single phase 3,7–7,4 kW, and the short course is usually resolved between a day and a half day of work. In middle lines, a day. Garage community-and three-phase, can be extended to 1-2 days for tours, trays and permits. If you want local references and a design adapted, you can start by the general page of MiSolar, where you'll also find information on the installation of solar panels and the integration with chargers.

-        What is better, a home charger of 3 kW or 7 kW? Depends on your habits, and contracted power. If you load many hours in a row and do a few km daily, 3.7 kW is enough. If you want more margin and windows, and shorter load, 7,4 kW is the sweet spot in single-phase.

-        It is sufficient for a load of 7 kW for domestic use? Yes in most cases. Provides 35-45 miles per hour, more than enough to recover from a week of travel in a single night.

-        What a charger 11 kW you need three-phase? Yes. 11 kW AC three phase. If your housing is single-phase, you will not be able to use 11 kW without passing phase.

-        Can I install a charger EV three-phase at home? Yes, if you have a three phase power supply or perform the change. It makes sense if you're looking for loads faster, repartes large consumption or have several EV.

-        What does a circuit breaker do I need for a charger 7.4 kW? As a guideline, a circuit breaker 40 A dedicated differential type A or type F is recommended by the manufacturer. The cable cross-section and final protection is calculated according to the distance and rules. You should always dimensionalize a licensed electrician.

-        3.7 kW for long cargo, and economic.

-        7,4 kW as standard for domestic single-phase load balancing.

-        11 kW only in three-phase and when you really need it.

Integrates the wallbox with your pv, program, load it in the app of the inverter and let it roll take care of your ICP. If you live in Javea and the Costa Blanca North and want a proposal that is clear to your house, our local team can visit your home, to design the solution, and leave the cargo list with priority to solar. It starts here on the web MiSolar and tell us how well you drive and how much you want to charge at home. We will advise you without obligation and we will help you to get the most out of your boards.