The first type is basically not used by drivers living in cities, because it is really difficult to have a small yard in the city; the third type is the most commonly used, and some vehicles use the second type. However, the most entangled consumers who have on-board chargers are often those who have on-board chargers, that is, the 3/4-level market, or in other words, the rural and township car market; so let’s dispel the doubts first. If you have a yard, or can throw the wires outside the door to charge, the on-board charger must be prepared with lines.
The maximum power of the on-board charger can reach 3.3kw, and some third-party brands of on-board chargers can reach 7kw, which places high demands on the selected socket.
The household wiring standards are as follows:
Air conditioning line-6 square
Kitchen and bathroom line-4 square meters
Ordinary line-2.5 square
The “square” of the wire is not the concept of square meters, but (pi × wire radius), the unit is square millimeters; 1 square of wire can theoretically support a unidirectional 3kw device, but this is only the limit standard. If the device of this standard is used for a long time, it can be said that the insulation layer is easy to melt due to high temperature and cause a short circuit. 1 square of copper wire is only suitable for devices below 1.76kw, and it is not suitable for long-term use, so the sockets of ordinary lighting and other equipment cannot be used for high-power devices, especially for car charging.
However, the minimum socket for household use should be 2.5 square meters, and the limit of 220V voltage can reach 3.6kw, but it is also not suitable for long-term use. Because the kitchen and bathroom need to use high-power equipment such as induction cookers, microwave ovens or bathroom heaters, the wire standards used are often higher. Some home decoration will choose 6 square wires, but most are only 4 square meters; this standard wire can only support high-power equipment for a short time, and its maximum load is within 6kw. However, household wires are basically hidden wires, and the heat dissipation effect of wires inside walls and floors is very poor, and wires are very easy to heat up; so a 4-square socket can only support a 3.3kw car charger at most, and a high-power car charger is not reliable enough. It was measured that a 4-square wire was used for a long time with a 5kw device, and the insulation layer melted and short-circuited in a few days. 6 square meters is almost the highest standard for household wires. Theoretically, 220V can support devices with a maximum power of about 8kw, so you can use a high-power car charger; but you still need to pay attention to the temperature of the wires when using them. Generally, the cabinet air conditioner socket will use a 6 square wire. Feel the temperature of the wire harness in the leakage protection at the entrance. If it feels warm, there is no problem. If it is a little hot, you cannot use a car charger close to 7kw, otherwise it may burn the wire harness. However, the so-called 7kw car charger or self-built pile is basically only about 6.5kw. As long as it is a national standard wire, there is sufficient redundancy. Otherwise, it is not good for non-standard wires.
In summary, the socket at home can indeed charge the car, but you must choose the right socket to avoid high-power equipment burning the wiring harness, and also avoid the possibility of equipment damage; as for flying wire charging, it is still not recommended. The safest way is to let the plug of the charging gun directly enter the internal socket. You should not use the common “plug-in tray” to connect the vehicle, because the wiring harness standards used by the plug-in tray are also relatively low and cannot support high-power equipment. If you must use a plug-in tray to extend the distance, you need to choose an industrial-grade PDU, which is a high-standard large plug-in tray, and the wiring harness must be at least 6 square meters.
If it is possible to run open wiring, the household line is generally 10 square meters. This standard can support 220V-13kw, which is very safe for high-power car chargers and self-built charging piles. The so-called self-built charging pile is a charger fixed on the wall, which is equivalent to connecting the plug and the socket of the car charger together. The charger box is just a box. Its main function is to be beautiful and leave a socket for the charging gun, which can be put in when not in use.
Conclusion: On-board chargers are mainly used by users who do not have the facilities to install charging piles, or for occasional use during long-distance travel. When using them, you must choose the right socket to avoid damaging the lines or even causing a fire. A dedicated new energy vehicle meter combined with a charging pile is the best solution, and it is also the most ideal charging solution for new energy vehicle users in rural and township areas.
However, some brands of vehicles do not come with charging piles, and the cost of purchasing charging piles by yourself is relatively high. In this case, you only need to apply for a new energy meter and a socket and use it with the vehicle charger.
