The POWERplate24 is an industrial power management solution for your Pi-Plate stack which provides a number of must-have features that include:

Conversion of any high input voltage between 9 and 30VDC to the 5V required by the Raspberry Pi and the other boards on your stack
UPS support and event monitoring through supported power supplies such as the MeanWell DRC family
an RPi compatible, battery backed, Real Time Clock
a 45mm cooling fan
a power switch with bicolor status LED
a low power microcontroller to handle scheduled tasks
four high voltage output connectors to drive external sensors and accessories
a 5VDC power output connector to drive additional peripherals in your system
Included with the POWERplate24 is a set of heatsinks for the hot components on your RPi and the backup battery for the RTC

Data shows that the combination of chip mounted heatsinks and a fan provide the best cooling performance for the quad core CPU on the Raspberry Pi4:

Unlike our other products, only a single POWERplate24 is required for your Pi-Plate stack and it should be placed directly above the the Raspberry Pi for maximum cooling. Also we are using plugable terminal blocks to eliminate the hassle of having to disassemble a stack of plates to add or remove cables. See below for detailed features for the POWERplate24.

Power Management

Converts any input voltage from 9 to 30VDC to the 5VDC required by the Raspberry Pi and the rest of the boards on the stack.
On board 5VDC regulator capable of producing 15W of power (5V at 3A)
UPS support and event monitoring via the external power supply such as the MeanWell DRC series
Can also be powered by 5VDC using a dedicated USB-C input - useful for development and bench testing
Four "always on" 3.5mm pluggable terminal blocks that route the input supply voltage (9-30VDC) to external sensors and peripherals
One "always on" 3.5mm pluggable terminal blocks to provide 5VDC for your setup
Onboard A/D converter provides monitoring functions for both 5VDC and the input supply voltage
Smart customizable power switch
Power up scheduler for remote battery operated applications
Software shutdown
Reverse polarity and transient suppression on HV DC input terminals
Bicolor LED provides programmable power status at a glance

Cooling

Onboard 45mm fan cools RPi
Each POWERplate24 includes a set of heat sinks for the hot components on the RPi
Fan can be controlled manually for custom cooling solutions or to minimize quiescent power consumption for battery based power solutions.

Real Time Clock