Testing of Chinese power bank IC designed for using with 1S battery and with supporting many fast charging protocols. But everything is not so perfect, let's take a closer look.

Analyzing of total PCB price with components and assembly

Listing of custom power bank specification and other requirements.

Searching for existing open source (DIY) power banks.

Searching for existing commercial transparent (DIY) power banks,

Small useful tip how using custom rule can improve PCB layout process.

Summary

• 💻 MCU: Cortex-M4 STM32F401
• 🖥 Display: IPS 160×80 px (ST7735)
• ⚡Output voltage (MAX): 150V+
• 🎆 Output current (MAX): 150mA+
• 🔽 Control: Mechanical Buttons
• 🔋 Powering: 1S1P 3.7V 18650 Li-Ion Battery
• 🔊 Notification:  Sound (Buzzer)
• ➡ Charging: USB Type-C

Let's see how real automotive Tesla board using low-votlage shutdown (lockout) DC-DC mechanism is used to protect cells against undervoltage.

Measuring of the quiescent and standby battery current when inverter enabled and disabled by button.

Big teardown of modern high-quality solar hybrid inverter. Mechanical parts.

Big teardown of modern high-quality solar hybrid inverter.

Big teardown of modern high-quality solar hybrid inverter.

Big teardown of modern high-quality solar hybrid inverter.

Big teardown of modern high-quality solar hybrid inverter, you need to see it 😎.

Let's check which exact voltage could be produced by the small solar panel 6V. This information is important for further energy transformation for device powering and battery charging.