HP-DPS800AB-11A: A Versatile Lab Power Supply #
Introduction #
For electronics enthusiasts and hobbyists, a reliable lab power supply is an essential tool. Recently, we discovered a treasure trove of HP-DPS800AB-11A power supplies at an incredibly low cost on Facebook Marketplace. These units offer a wealth of potential for repurposing as versatile lab power supplies.
Technical Specifications #
The HP-DPS800AB-11A, also known by various other part numbers, is a 12V, 800W server power supply. Its key specifications include:
- Input voltage: 100-240V AC
- Output voltage: 12V DC
- Output current: 66A
- Overvoltage protection (OVP): 12.6V
Output Voltage Modification #
To customize the output voltage for specific applications, a simple modification can be performed. By replacing two resistors on the power supply board, the output voltage can be increased to around 13.8V. This modification is ideal for charging lithium batteries, which require a higher voltage than the standard 12V output.
Floating Ground Output #
A unique feature of the HP-DPS800AB-11A is its floating ground output. By removing the earth ground connection, these power supplies can be connected in series to achieve higher voltages. This allows for charging large lithium battery banks or powering high-voltage devices.
Modification Procedure #
To create a floating ground output, follow these steps:
- Open the power supply and locate the three screws holding the board in place.
- Identify the two screws that provide grounding and file them down.
- Replace the grounding screws with nylon washers and M3 nylon screws.
- Remove the grounding only for the post nearest to the PCB tabs, leaving the other grounding post intact.
Conclusion #
With these modifications, the HP-DPS800AB-11A power supply becomes a versatile and cost-effective solution for various lab applications. Its ability to provide adjustable output voltage, floating ground output, and high power output make it an excellent choice for charging batteries, powering high-voltage devices, and performing a wide range of electronic projects.
