Is your home charging pile vulnerable to exposure to the sun? When purchasing a 7KW AC charging pile mainboard, don't miss these three heat dissipation and protection indicators!

Home charging and outdoor installation, summer sun exposure is the norm. The charging pile motherboard cannot withstand the heat, which can result in reduced power and slower charging, or overheating and shutdown, capacitor bulging, and relay fusion welding. When choosing a 7kW AC charging station motherboard, these three heat dissipation and protection indicators must be closely monitored.

1、 Shell heat dissipation capability: It's not about whether there's a fan, it's about the thermal resistance path

• Many manufacturers promote "smart temperature controlled fans", but fans are only the last line of insurance. The true determinant of heat dissipation efficiency is the smoothness of the path from the device to the thermal interface, then to the shell and finally to the air.

• The key is to consider three points: whether the power devices (relays, rectifier bridges, power chips) are directly attached to the aluminum alloy housing through thermal pads (rather than silicone grease). Thermal pads can compress and rebound, fill micro gaps, have a thermal resistance 40% lower than silicone grease, and do not age or crack for 10 years. Silicone grease fails to pump out at high temperatures for 2-3 years, and later maintenance is equivalent to dismantling and reapplying.

• Does the shell itself have heat dissipation fins. The fin height is over 15mm and the spacing is about 5mm, increasing the surface area by 30-50% and significantly improving the natural heat dissipation efficiency. However, please note that the fins must be installed perpendicular to the ground to facilitate the upward convection of hot air; Horizontal installation accumulates dust and reduces heat dissipation efficiency by half.

• Is there a chimney duct inside. Bottom air inlet and top air outlet utilize the natural rise of hot air to form convection, which can maintain basic heat dissipation even when the fan stops running. A closed shell without an air duct can cause the motherboard to burn out immediately when the fan breaks.

2、 Temperature threshold design: not focusing on higher temperature resistance, but on warning and power reduction strategies

• The nominal temperature resistance of the device at 105 ℃ does not mean that it can run at 105 ℃ for a long time. The lifespan of electrolytic capacitors is only 2000 hours (about 3 months) at 105 ℃, and only 16000 hours (about 2 years) at 70 ℃. So the key lies in the temperature management strategy of the motherboard:

• Is the warning threshold setting reasonable. When the temperature of the relay casing or capacitor casing reaches 75 ℃, should the power be reduced in advance (limited to 3.5kW for 7kW) and the fan be turned on at full speed, instead of waiting until 95 ℃ to activate. Intervention at 20 ℃ in advance resulted in a 4-fold difference in lifespan.

• Is the power reduction curve smooth. Some motherboards are cut in half when the threshold is reached, resulting in an abrupt user experience. A good design is a stepped power reduction: limited to 5kW at 80 ℃, 3.5kW at 85 ℃, and shutdown at 90 ℃. Provide users with buffer time and avoid frequent on/off and arcing of relays with carrier frequency.

• Is the fan strategy intelligent. It's not constant speed noise bombardment, but PWM speed regulation: low load stall or 30% speed, high load 60%, over temperature warning. The noise level has been reduced from 45dB to below 35dB for daily use, and it is installed in the courtyard without disturbing the residents.

3、 Protection level and material: IP55 is the bottom line, IP67 is reassuring

• The higher the IP rating, the better, but outdoor pile IP55 is the bottom line. Number 5 is dustproof, and the second number 5 is waterproof. The house filling piles are installed in the open air, rainstorm oblique driving, high-pressure water gun washing (property cleaning) are normal, and IP55 can carry them. If installed near the seaside, industrial areas, or construction sites, it is recommended to use IP67, which is completely dust-proof and can be submerged in water for a short period of time.

• But IP67 has a trap: the better the sealing, the worse the heat dissipation. The pure sealed shell is a sealed container and must be designed with the chimney duct, waterproof breathable valve (ePTFE membrane, waterproof and breathable), and internal positive pressure fan to prevent external water and dissipate internal heat.

• Three proof paint is an invisible life insurance. The motherboard is coated with moisture-proof, anti mold, and anti salt spray coatings, with a focus on covering the solder pads and chip pins. After the rainstorm in summer, the inner wall of the shell was dewed, and the bare plate became copper green 48 hours later. The micro short circuit led to insulation alarm or electric leakage. Three proof paint locks the insulation impedance at the gigaohm level, and condensation is only water droplets that do not conduct electricity. In the salt spray environment by the seaside, motherboards without three proof paint will be scrapped in six months.

Summary in one sentence:

• Choose a 7kW home charging pile motherboard, heat dissipation check thermal pad+fin shell+chimney air duct three piece set, temperature control check 75 ℃ warning+step power reduction+PWM speed regulation, protection check IP55/IP67+three proof paint+waterproof breathable valve. Missing one of the three indicators, summer sun exposure is the gateway to motherboard failure.

The communication charging pile motherboard produced by Xincheng Technology is of high quality and beautiful price. Welcome to inquire and purchase!