A system sized for demand charge reduction will not serve as meaningful backup, and a system sized for backup duration will be over-invested for peak shaving. Choosing is not a compromise. It is the design.

Stage Two: Bring Data, Not Estimates

Twelve months of interval metering is the minimum useful input. Monthly bills show the total but not the shape, and the shape is what determines the power rating.

Three figures should come out of that analysis before any supplier is contacted.

Peak demand and its duration

The peak in kW, and how many hours per year the site sits within 10% of it. A peak lasting minutes needs a different system from one lasting hours.

Daily energy to be shifted

The energy that must move from one part of the day to another to achieve the intended outcome.

Full-equivalent cycles per year

This is the figure buyers most often skip, and it determines whether the warranty envelope matches the operating plan.

MPMC HBD-A Series, HBD-1000-2000. 1,125 kW rated AC power, 2,170 kWh capacity, liquid cooling.

Stage Three: Use the Enquiry to Test Engineering Depth

Send the load data rather than a specification, and ask each supplier to propose a configuration and justify it. The responses will sort themselves.

A component vendor returns a price against the nearest catalogue model. A project supplier returns a sizing rationale, a single-line diagram, an assumption list and a question about something in the data.

Two follow-up questions are worth asking every respondent.

Why this power-to-energy ratio? MPMC’s HBD-250-1000 and HBD-500-1000 are both listed at 1,045 kWh but at 250 kW and 500 kW respectively. A supplier that cannot explain which suits the site has not read the data.

What did you assume about usable energy and round-trip efficiency? Nameplate capacity is not deliverable energy, and a proposal that does not state the adjustment has not made one.

Stage Four: Read the Warranty as an Operating Constraint

Warranty text in this segment is not boilerplate. It restricts how the asset may be operated.

MPMC’s published HBD-A terms list a system warranty of 5 years or 2.2 MWh/kWh total output, whichever comes first, and a battery performance warranty of 10 years or 4.3 MWh/kWh, with end-of-life capacity retention of at least 70%. Validity is stated as conditional on maintaining battery box temperature at 0°C to 25°C and humidity at or below 80%.

Two things follow. The throughput limit may be reached long before the calendar limit on a heavily cycled system, and the environmental condition is an operating obligation rather than a description.

Compare warranty text before comparing price. A longer headline term with a lower throughput allowance can be worth less.

Stage Five: Ask What Year Six Looks Like

Industrial storage is a ten-year asset bought on a twelve-week procurement cycle. Three questions cover the gap.

Who supplies replacement modules, and for how long

Cell formats change. Confirm the commitment in writing.

What degrades, and how it is measured

MPMC lists 8,000 cycles at 90% depth of discharge for the HBD-A series with LFP 314 Ah cells. Confirm how capacity will be verified against that curve.

What can be diagnosed remotely

MPMC lists a self-developed EMS and SCADA with real-time monitoring, alarm and fault management, automated reporting and 10-year data retention. Remote diagnosis determines whether a fault is a phone call or a site visit.

MPMC Yangzhong facility, Jiangsu. Battery energy storage assembly line in a listed 19,000 m² workshop.

A Scoring Sheet Worth Reusing