P-Bus System Monitors PSS, PSM2 & PSL – Central Onboard Power System Monitoring and Control
The P-Bus system monitors PSS, PSM2, and PSL are the central display and control units of the P-Bus energy management system for monitoring and controlling the entire onboard electrical system. They display battery status, power consumption, energy balance, tank levels, temperatures, and AC and DC supply in real-time – suitable for use in boats, yachts, motorhomes, expedition vehicles, and special vehicles.
Briefly explained: P-Bus system monitors connect all components of the onboard electrical system via a CAN bus network and display all relevant system data centrally on one or more touch displays.
What are P-Bus System Monitors and how do PSS, PSM2 and PSL work?
The P-Bus system monitors PSS, PSM2, and PSL are touch control units for the P-Bus energy management system. Via a CAN bus network, they communicate with all connected P-Bus components and display battery data, tank levels, temperatures, switching states, and AC and DC supply data in real-time.
Several system monitors can be operated in parallel at the same time – at different locations in the vehicle or on board, each with individually configurable displays. PSS, PSM2, and PSL differ in display size, resolution, and functional scope – all three models are fully P-Bus compatible and can be used together in the same system.
Which P-Bus components can be connected to the system monitors?
The P-Bus system is modular and scalable. Starting with a single battery management shunt, it can be gradually expanded into a complete energy management system:
| P-Bus Component |
Function |
| SHX 300 |
Battery monitoring & energy balance – charge status, current, voltage |
| SHC 612 |
Battery monitoring for up to 6 battery groups simultaneously |
| CMT2 Tank Interface |
Tank monitoring for up to 4 tanks |
| CMR4 Switching Interface |
Control and display of up to 4 switching functions |
| CAV AC-Interface |
Monitoring of the AC mains (shore power, generator) |
| TPC4 Temperature Interface |
Temperature monitoring at up to 4 measuring points |
| LAU AC-Transfer Unit |
Control and monitoring of AC transfer units |
| ACE Charger Series |
Integration of chargers into the P-Bus system |
| EM-Box |
Energy management box for extended system functions |
Using P-Bus as a battery monitor – how does it work?
With just a single battery management shunt, the P-Bus system monitor can be used as a fully-fledged battery monitor – without any other components. Two variants are available:
SHX 300: Records charge status, current, voltage and also the entire energy balance of the onboard electrical system. Accurate even in lithium systems.
SHC 612: Enables simultaneous monitoring of up to six battery groups – ideal for onboard electrical systems with starter, service, and lithium batteries.
Both shunts communicate directly with the system monitor via the CAN bus network.
How is the P-Bus system wired and networked?
All P-Bus components are networked via M12 connection cables, which connect all devices via the CAN bus network. Connection is straightforward thanks to the standardized M12 connector system. When planning a P-Bus system, suitable M12 connection cables of sufficient length and quantity should be considered.
Firmware updates for P-Bus system monitors – how do I stay up to date?
Current firmware updates for all compatible P-Bus components are available in the download area. Regular updates extend the functionality of the system monitors and ensure maximum system stability. It is recommended to install the latest firmware before commissioning.
Frequently Asked Questions about P-Bus System Monitors
Can several system monitors be operated simultaneously? Yes. Several PSS, PSM2, or PSL monitors can be operated in parallel in the same P-Bus system – at different positions in the vehicle or on board, with individually configurable display content.
What data do the P-Bus system monitors display? Battery status, power consumption, energy balance, tank levels (up to 4 tanks per CMT2), temperatures (up to 4 measuring points per TPC4), switching states (up to 4 functions per CMR4), as well as AC and DC supply data.
Is the P-Bus system suitable for lithium batteries? Yes. The P-Bus system is designed for modern onboard electrical systems with lithium batteries, inverters, and charge boosters. The SHX 300 shunt accurately records charge status, current, voltage, and energy balance even in lithium systems.
What is the difference between PSS, PSM2, and PSL? PSS, PSM2, and PSL differ in display size, resolution, and functional scope. All three models are fully P-Bus compatible and can be operated in parallel in the same system.
How many tanks and temperature sensors can the system monitor? The CMT2 tank interface monitors up to 4 tanks per unit, and the TPC4 temperature interface measures at up to 4 points simultaneously. By using multiple interfaces, the number of monitored points can be extended as required.
Can I also switch consumers via the system monitor? Yes. The CMR4 switching interface enables direct control of up to 4 switching functions via the system monitor's touchscreen.
P-Bus System Monitors PSS, PSM2, PSL – CAN bus energy management | battery monitoring, tank monitoring, AC monitoring | compatible with SHX 300, SHC 612, CMT2, CMR4, CAV, TPC4, ACE, EM-Box | for boats, yachts, motorhomes, expedition vehicles | lithium batteries, inverters, charge boosters | M12 connection cables, CAN bus network
