What key indicators should you focus on when selecting a 7KW charging pile motherboard? How to avoid purchasing substandard products?

When choosing a 7kW charging pile motherboard, the core focus is on the five indicators of "power safety measurement communication reliability", and learn three tricks to avoid pitfalls. Below, we will explain the key parameters, testing techniques, and brand recommendations in one go, and after reading them, you can proceed with purchasing orders.

1、 Five key indicators (understood in one sentence)

Power and current

• 220V × 32A=7kW, the motherboard must continuously output 32A with an error of ≤± 0.2A. If it is lower than 31.8A, it is marked as "virtual 7kW".

safety protection

• Overvoltage, undervoltage, overcurrent, leakage, overheating, adhesion, and lightning strikes must not be omitted; Response time ≤ 50ms, otherwise the jump gun will be delayed by one shot.

measurement accuracy

• Active energy error ≤ ± 0.5% (GB/T 18487.1-2024), full range of current 0.5-63A; Single phase SOC solutions are available for household use (such as Juquan HT5015), and CMC certification is mandatory for commercial use.

Communication and Plug and Play

• At least one wireless connection, Bluetooth or 4G, with OCPP1.6J protocol stack written into Flash; CP signal detection accuracy of ± 1% is required to achieve "gun insertion 0.8s start".

Reliability and lifespan

• MTBF≥5000h， The mechanical lifespan of the relay is ≥ 500000 times, and the lifespan of the electrolytic capacitor at 105 ℃ is ≥ 2000h; the industrial grade temperature range of -40 ℃~85 ℃ is the outdoor bottom line.

2、 Three tips to avoid inferior motherboards

On site trial charging

• Tested with your car: set to 32A, with an ammeter reading of 31.8-32.2A and a power factor of ≥ 0.95, without overheating or disconnection for 15 consecutive minutes, and with no false power indication.

Disassemble the machine and inspect the material

• Main controller: Cortex-M4/M33, with brands such as Zhaoyi GD, National N32, and Juquan HT as benchmarks

• IGBT/SCR: Silan Micro, Dongwei 40A/650V level, TO-247 package, refuses to use miscellaneous labels

• Electrolytic capacitors: Nichicon, Rubycon, 105 ℃ above 2000h

• PCB: 2 Oz copper thickness, high voltage creepage distance ≥ 3mm, fully coated with three proof paint

• The material grade can be distinguished at a glance, and counterfeit boards commonly use disassembled parts or 65 ℃ capacitors.

Check certification and after-sales service

• The motherboard body should have CCC, CMC, and CE marks; The supplier promises a 24 month warranty and a local spare parts warehouse to avoid waiting for a month if it breaks down.

3、 Brand and Price Overview (2025 Market Trends)

• Entry level (300-500 yuan): Core Orange, Chint, Delixi 7kW board, card swiping+4G, suitable for household use, with solid materials.

• Mid to high end (600-800 yuan): Star charging, Core Orange ACP694, plug and play+LCD+voice, MTBF>6000h， Suitable for centralized property management.

• DIY careful selection: "Bare boards" priced below 250 yuan on Taobao are mostly dismantled or falsely labeled as 32A, with a measured current of only 28A and a 15% slow charging time.

4、 One sentence summary

• Choose a 7kW motherboard: reliable power, comprehensive protection, accurate measurement, fast communication, and long lifespan; On site trial charging, disassembly and inspection of materials, and verification are three steps to bid farewell to inferior products.

Xincheng Technology's 7KW AC charging pile motherboard has good quality, stable performance, and high efficiency. Welcome to consult and purchase!