Modern cars are not only engines and suspension, but also complex electrical systems that require competent management. The electrical panel (or distribution panel) in the garage, workshop or even in the vehicle itself (for example, for campers or custom cars) becomes a key safety element. You can assemble it not only manually, but also online — with the help of specialized services that help you select components, calculate the load and visualize the circuit before purchasing the parts.
In this article, we will look at how to properly plan the assembly of an electrical panel via the Internet: from choosing automatic machines and RCDs to checking the circuit for compliance with standards. We will pay special attention automotive solutions - for example, panels for charging stations for electric vehicles or autonomous power systems in vans. You will find out what online tools save time, and where you can’t do without offline checking.
Important: even virtual assembly requires an understanding of basic electrical engineering. If you have never worked with voltage higher 12V, it is better to involve a specialist - errors in the switchboard can lead to a fire or failure of expensive equipment (for example, inverters in Tesla Powerwall or charging stations Wallbox).
Why collect a shield online: 5 key advantages
The traditional approach of buying components by eye and installing them blindly is fraught with cost overruns or, worse, accidents. Online assembly solves these problems:
- 🔍 Accurate load calculation. Services automatically take into account the power of devices (for example, a welding machine Fubag IR 200 or a car compressor) and select the ratings of the machines.
- 💰 Save up to 30%. Virtual “trying on” of components helps to avoid the purchase of extra modules or, conversely, a shortage of space in the panel (relevant for panels ABB Mistral65 or Schneider Electric Kaedra).
- 📐 Visualization of the circuit. You can see how RCDs, automatic circuit breakers and voltage relays will be located (for example, RN-111M) even before installation.
- ⚡ Checking for compliance with the PUE. Some platforms (eg. ElectroCalc) signal violations of standards (for example, the absence of RCDs for socket groups).
- 🚗 Custom Templates. There are ready-made solutions for car enthusiasts: panels for garages with connections
380V, backup power systems for Victron inverters or charging stations Zappi.
Example: if you are installing in a garage painting stand with a hood and compressor, the online service will tell you what for the line 220V/16A need a machine gun C16, and for three-phase equipment - S25 with RCD 40A/30mA. Without such a calculation, the risk of wiring overheating increases significantly.
Top 5 online services for assembling an electrical panel
Not all platforms are created equal. We tested popular tools and selected those that are suitable for automotive and garage projects:
| Service | Features | Free functionality | Who is it suitable for? |
|---|---|---|---|
| ElectroCalc | Calculation of cable cross-section, selection of machines, checking according to PUE | Yes (with a limit of 10 components) | Beginners, garage panels |
| Schneider Electric EcoStruxure | 3D visualization, databases Acti9 and Multi9 | No (demo version 7 days) | Professionals, complex schemes |
| ABB Electrical Installation Calculator | Catalog integration ABB, calculation of short circuits | Yes (full) | Shields with equipment ABB |
| ETAP | Load modeling, harmonic analysis (relevant for charging stations) | No (from $100/month) | Industrial facilities, electric vehicles |
| QElectroTech | Open source software, support for user libraries | Yes | Auto electrics tuning, non-standard circuits |
Critical feature: the services do not take into account the specifics of automotive networks (for example, voltage surges when starting the starter or operation from an inverter). Best for RVs or campers QElectroTech with manual adjustment of parameters.
If you are assembling a shield for an electric vehicle charging station (for example, Tesla Wall Connector), in the service, indicate the load 20-30% higher than the nameplate - this compensates for peak currents during charging.
Step-by-step instructions: how to assemble a shield online
Let's look at the process using the example of a service ElectroCalc for garage panel with single-phase connection 220V and a line for the welding machine.
Step 1. Determine the loads
List all appliances with wattage. For example:
- 🔌 LED lighting:
200W - 🔧 Welding machine Resanta SAI-190:
5.7 kW - 🚗 Battery charger CTEK MXS 5.0:
700W - 🌬️ Exhaust fan:
300W
In the service, enter this data in the section "Loads". Specify the simultaneity factor (for example, 0.7 - if not all devices will work simultaneously).
Step 2. Selection of machines and RCDs
The service will automatically offer:
- 🔋 For lighting: automatic C10, cable
VVGng 3×1.5 - ⚡ For welding: automatic S32, cable
VVGng 3×6, RCD 40A/30mA - 🔋 For charger: automatic C6, cable
VVGng 3×2.5
☑️ Check the diagram before purchasing
Step 3. Visualization and export of the diagram
The service will generate a diagram indicating:
- Module locations (for example, RCD on the left, machines on the right).
- Color marking of lines (according to GOST R 50462-2009).
- Installation recommendations (e.g.
"use a comb bus to connect machines").
Export the diagram to PDF or DWG - this will be useful for installation.
What to do if the service does not find the required component?
Some services (for example, Schneider Electric) are tied to their directories. In this case:
1. Select a module with similar characteristics (for example, instead of ABB SH203L C16 take IEK BA47-29 C16).
2. Manually adjust the parameters in the service (rating, number of poles).
3. Check compatibility on forums (for example, Mastercity or Drive2).
Common mistakes when building online
Even with services, it’s easy to make critical mistakes. Here's what's most often missed:
⚠️ Attention: If the switchboard provides a connection three phase compressor (for example, Fubag VCK/50), but the service indicates only a single-phase load, the machines will be selected incorrectly. Three-phase lines require 4-pole circuit breakers and a separate RCD!
- 🔌 Ignoring inrush currents. For example, an RV refrigerator consumes 3 to 5 times its rated value when starting up. The services do not take this into account - increase the rating of the machine by 1 step (for example, from C16 on S20).
- 📡 Lack of module reserve. After installation, a panel with 12 modules often does not have enough space for an additional voltage relay or meter. Always leave
2–3 free slots. - ⚡ Incorrect RCD for wet rooms. In a garage with a car wash or a caravan, you need an RCD with leakage current 10mA (not standard 30mA).
- 🔋 Neglect of selectivity. If the higher-level machine has the same rating as the group one, during a short circuit the entire shield will turn off. Use the rule:
nominal value of the introductory machine ≥ sum of group + 20%.
Case Study: User Drive2 with nickname @GarageMaster I assembled a shield online for the garage, but did not take into account that welding machine and vacuum cleaner should not work from one line. As a result, when both devices were turned on, the RCD was triggered due to excess leakage current. I had to redo the scheme with the addition of a second group.
Features of assembling a panel for auto electricians
If you are installing a shield for camper, caravan or garage with automotive equipment, consider the specifics:
- 🚐 Double insulation. In mobile systems (for example, in Ford Transit with accommodation) use cables marked
NG-LS(non-flammable, low smoke generation). - 🔋 Inverters and batteries. To connect the inverter Victron MultiPlus 3000VA need a separate line with a machine C50 and fuse ANL 200A next to the battery.
- ⚡ Charging stations. For Wallbox Pulsar Plus 22kW 3-phase input required
380V, automatic C40 and RCD type A (not AC!). - 📶 Surge protection. Be sure to install in the garage panel surge arrester (surge suppressor) or voltage relay RN-113 — surges in the network can damage the battery charger.
Example diagram for a camper van:
- Input: automatic C63 + RCD 80A/30mA.
- Inverter line: automatic C50 + fuse ANL 150A.
- Line of sockets: automatic C16 + RCD 25A/10mA.
- Lighting line: automatic C6.
For mobile systems (campers, yachts) use modular panels with DIN rails (eg Bluesea BS-12). They are compact and allow you to quickly reconfigure the circuit when loads change.
How to check the assembled circuit before purchasing
Online services provide only a theoretical model. Before purchasing components:
⚠️ Attention: If the circuit uses difavtomats (for example, ABB DS201 C16/30mA), make sure their sensitivity matches the type of load. For engines (compressors, pumps) we need automatic machines of the type D, not C!
- Selectivity check: Use manufacturer's selectivity tables (e.g. ABB). The machines must be turned off in cascade: first group, then introductory.
- Overload test: in service ETAP simulate the simultaneous switching on of all devices. If the machine turns off, increase its rating or divide the load into groups.
- RCD check: the total leakage current of all devices (indicated in passports) should not exceed
1/3from the nominal value of the RCD. For example, for RCD 30mA total leakage current should be ≤10mA. - Inverter compatibility: if there is an inverter in the panel (for example, MUST Solar 3000W), make sure that the machines are designed for non-sinusoidal currents (use series iC60N from Schneider Electric).
For final verification, download the diagram in format DWG and show it to an electrician. An experienced specialist will notice nuances that the service might have missed (for example, the need isolation transformer for wet areas).
Where to order components after online assembly
After the scheme is approved, all that remains is to buy the components. For car and garage panels we recommend:
| Component type | Recommended Brands | Where to buy | Average price |
|---|---|---|---|
| Automatic machines, RCD | ABB SH200, Schneider Acti9, IEK BA47 | 220Volt, ETM | from 200 rub. per module |
| Shields | ABB Mistral65, Schneider Kaedra, IEK KMPn | Leroy Merlin, Ozon | from 1,500 rub. (12 modules) |
| Cables | VVGng-LS, NYM | Kabel.RF | from 50 rub./m |
| Inverters, charging stations | Victron, Wallbox, Tesla | Solar-Battery | from 50,000 rub. |
Tip: when ordering, please check certificates of conformity (for example, GOST R 51321.1 for automatic machines). There are many fake brands on the market ABB or Schneider, which are externally indistinguishable, but cannot withstand rated currents.
FAQ: Frequently asked questions about assembling a shield online
Is it possible to assemble a shield for charging an electric car online?
Yes, but with reservations. Services like ETAP or Schneider EcoStruxure allow you to simulate a three-phase load (for example, for Tesla Wall Connector on 22 kW). However:
- Specify that the load nonlinear (charging stations generate harmonics).
- Select RCD type A (not AC), since it reacts to a constant leakage current.
- Add surge suppressor (OPN) - network surges can damage the car’s on-board computer.
After assembly, the circuit must be approved by an electrician with a permit. PTEEP (rules of technical operation).
How to take into account the connection of a welding machine in an online diagram?
Welding machines (eg Resanta SAI-220) create short-term peak loads. In the service:
- Specify maximum current device (for example,
190Afor SAI-190). - Select a machine with characteristic D (not C) since it can withstand inrush currents.
- Set the demand factor
0.7–0.8(the welding machine rarely works continuously). - Use a cable with a cross section of at least
6 mm²(for devices up to200A).
Important: if welding is connected to the switchboard via a socket, the latter must be industrial type (for example, Legrand Plexo 32A).
What services support the Russian-language interface?
Fully Russified platforms:
- ElectroCalc — a simple calculator with basic functions.
- Electrical panel calculation from "ElectroAS" — domestic service taking into account the PUE.
- QElectroTech - open source software with localization (must be downloaded separately).
For professional tasks (for example, calculating harmonics for charging stations) you will have to use English-language ETAP or AutoCAD Electrical.
Is it possible to use an online scheme for approval in energy supervision?
No, the online scheme is draft. For approval, design documentation completed by a licensed organization is required. However:
- You can provide the online diagram to your designer as terms of reference.
- Some services (for example, Schneider EcoStruxure) generate reports that simplify the designer's work.
- For garage cooperatives or SNTs, a diagram certified by a local electrician is often sufficient.
Cost of project approval in Energonadzor - from 10,000 rub. (for individuals).
What if the service does not have the required component (for example, a priority relay)?
Algorithm of actions:
- Find analogue according to technical specifications. For example, instead of a priority relay RP-31 can be used ABB CM-PVS.40.
- Add the component manually by specifying:
- Rated current.
- Number of poles.
- Dimensions (in DIN modules).
For non-standard solutions (for example, backup power systems with battery) it is better to use QElectroTech — there you can create custom component libraries.