Buildings designed to low-emission standards ask storage to do several things at once: raise the proportion of on-site generation that is actually consumed, reduce demand drawn from the network, and provide resilience without an engine running in a populated area. From a procurement perspective those are three separate sizing questions sharing one asset. MPMC POWERTECH CORP., established in 2008 and headquartered in Shanghai Pudong, publishes stationary storage in both cabinet and containerised formats with direct solar input.
MPMC HBD-E Series battery energy storage system — HBD-50-100, four units
Three Roles, One Asset
|
Role |
What the system must do |
What governs the sizing |
|
Solar self-consumption |
Absorb generation and release it after dark |
Energy generated after on-site demand ends |
|
Demand reduction |
Supply the excess above a chosen threshold |
How far above the threshold the building peaks, and for how long |
|
Resilience |
Carry a defined critical load through an interruption |
Critical load in kilowatts and the duration required |
|
Power quality |
Support voltage during lift and plant starting |
Starting current of the largest connected motor |
|
Emissions at the point of use |
Operate with none while on stored energy |
Hours the building must run without an engine |
Most projects want several of these, which is legitimate provided the conflicts are resolved deliberately. Energy discharged for self-consumption is not available for an outage, so a reserved state of charge should be defined and the control strategy written around it.
Working With Generation Already on the Roof
Most buildings of this type already generate on site, and storage lets that generation contribute to resilience rather than only to consumption. MPMC lists direct PV input on the HBD-E series at up to 60, 80 and 100 kWp on the HBD-30-100, HBD-40-100 and HBD-50-100 respectively, with the series described as an all-in-one cabinet combining inverter, power conversion and EMS.
During an extended interruption a rooftop array can extend the backup period considerably, provided the control system is configured to accept generation while operating islanded. That behaviour should be confirmed explicitly, because it is precisely the advantage the building is counting on.
Sizing Resilience to the Critical Panel
Backup schemes normally protect a defined critical panel rather than the whole building, and defining that panel is what makes a given rating adequate. Rated power must clear that load before duration becomes relevant.
MPMC lists 150% overload for 10 seconds on the HBD-E series, which is the figure to check against lifts, pumps and air handling. Where the protected equipment cannot tolerate a brief interruption, seamless transition should be specified, since MPMC lists it as standard on the mobile HBD-R series and as a configured option on the stationary HBD-A series.
MPMC HBD-A Series battery energy storage system — HBD-500-1000
Matching the Range to Building Scale
MPMC's published HBD-E series runs from 10 to 125 kW and 30.7 to 261.2 kWh with HVAC cooling and 6,000 cycles at 90% depth of discharge, suiting a single building or a small commercial site. The containerised HBD-A series continues from 125 kW and 261 kWh to 1,125 kW and 2,170 kWh with liquid cooling and 8,000 cycles.
The step between them is not simply capacity. Liquid cooling and the higher cycle rating are what a building cycling daily for a decade is buying, so the two families should not be compared on kilowatt-hours alone.
Siting Storage In or Near Occupied Space
Placing energy storage close to occupied areas brings the fire strategy into scope earlier than the electrical design does. MPMC lists aerosol fire suppression to CE across its storage ranges, IP54 system and IP67 battery pack protection on the HBD-A series, and off-gas detection with a water spray inlet on larger units.
These are product provisions rather than an approval to install. Separation distances, detection interfaces with the building system, ventilation and emergency service access are determined locally, and in an occupied building they normally shape the equipment position more than the cable route does.
Evidence a Building Project Will Need
Where a building reports against an energy or emissions commitment, the evidence usually required is measured rather than declared: energy stored and discharged, the proportion of on-site generation consumed rather than exported, and hours run without an engine.
MPMC lists a self-developed SCADA supporting real-time monitoring, alarm and fault management, maintenance management with early warnings, automated reporting and up to ten years of data retention. For a building management team the useful questions are whether those figures surface on the platform already in use and whether the reports needed for a compliance or insurance review can be produced without manual work.
Longevity and Warranty
MPMC's published warranty for the HBD-A and HBD-E series is 5 years or 2.2 MWh per kWh of capacity for the system and 10 years or 4.3 MWh per kWh for battery performance, with end-of-life capacity retention of at least 70%, alongside a validity condition requiring battery box temperature between 0°C and 25°C with a ±3°C tolerance and humidity at or below 80%.
A building cycling once daily for self-consumption approaches the throughput allowance before the calendar term, while the resilience value depends on capacity remaining late in life. Sizing should therefore be checked against end-of-life capacity, since the outage being protected against may occur in year nine.
Building Project Checks
• Rank the three roles and define a reserved state of charge for resilience.
• Supply an interval load profile alongside the generation profile.
• Define the critical panel and its load, separately from building demand.
• Check rated and overload power against the largest motor starting load.
• Confirm whether rooftop generation can contribute while the system is islanded.
• Specify seamless transition where connected equipment cannot tolerate a gap.
• Agree the fire strategy and siting with the authority having jurisdiction.
• Confirm which reported figures the monitoring platform can produce automatically.
https://www.mpmc-group.com/
MPMC Powertech Corp.
