Pairing storage with a generator at a remote site is a control problem more than a hardware one. The two machines have to agree on when the engine starts, at what state of charge, and what load point it holds while running, and that logic is where the promised saving is realised or lost. From a procurement perspective the compatibility question comes before the capacity question. MPMC POWERTECH CORP., established in 2008 and headquartered in Shanghai Pudong, publishes an HBD-R series positioned explicitly as a generator set partner.
MPMC battery energy storage system operating in parallel with a generator set
Controller Compatibility Comes First
A storage unit that cannot communicate with the generator's controller can still work, but only as a separate machine sharing a busbar, which forfeits most of the benefit. MPMC lists the HBD-R series as compatible with DSE, ComAp, DEIF, Woodward, Smartgen and CAT EMCP controllers, with millisecond-level transient smoothing for parallel operation.
That list should be checked against the specific controller on the existing set rather than accepted in general, because a mismatch turns an intended hybrid into two independent installations and removes the dispatch logic that produces the saving.
What the Arrangement Actually Does
The engine holds a load point near its efficient region while the battery absorbs variation and motor-starting inrush, and during periods of very low demand the engine stops entirely while storage carries the load. The saving comes from removing hours of inefficient running rather than from improving the engine.
MPMC cites fuel reduction of up to 75% against diesel-only operation in low-load conditions. A documented United Kingdom construction case describes a 56 kW generator serving a 3 to 6 kW base load gaining a 30 kW / 60 kWh unit, after which refuelling moved from every two days to every seven and the maintenance interval extended from every ten days to every sixty. Those figures belong to that installation; the saving scales with how lightly the engine was loaded to begin with.
Sizing the Storage Against the Engine
|
Input |
Why it drives the sizing |
How to obtain it |
|
Generator rating and loading |
Sets how much inefficient running exists |
Nameplate plus a logged load profile |
|
Quiet-period load |
The load storage carries while the engine is off |
Circuits genuinely energised outside working hours |
|
Largest starting load |
Storage must carry inrush without the engine |
Motor starting current on those circuits |
|
Quiet-period duration |
Determines the capacity required |
Working pattern or consent hours |
|
Recharge window |
Storage must refill while the engine runs |
Hours available and spare generator capacity |
MPMC lists the HBD-30-60 at 30 kW with 61.44 kWh and the HBD-50-100 at 50 kW continuous with 112.5 kWh, rising to 610 kW with 610.6 kWh at the top of the mobile range. Rated power and capacity both have to clear the requirement: power for the quiet load and its starting current, capacity for the length of the quiet period.
Dispatch Settings Deserve Agreement
Two settings determine most of the outcome. The state of charge at which the engine starts trades fuel against battery cycling, and the load point the engine holds while running trades efficiency against recharge speed. Neither has a universally correct answer, and both should be agreed and demonstrated at commissioning rather than left at default.
A third question applies where availability matters: whether a reserved state of charge is held back so that storage can cover a generator failure. That reservation is a control setting rather than a hardware feature, and it should be specified explicitly.
MPMC HBD-R Series battery energy storage system — HBD-50-100
Benefits Beyond the Fuel Line
Fuel is the headline but on many remote sites it is not the largest saving. Fewer running hours mean fewer service visits, and each visit to a remote job site carries travel time and access arrangements that dwarf the cost of oil and filters.
Noise is the third effect and sometimes decisive. A site able to run silently outside working hours can operate where a consent restricts night running, which MPMC's published UK case demonstrates through six 30 kW / 60 kWh units covering a 17:00 to 07:00 ordinance.
Practical Limits Worth Knowing
MPMC lists an operating range of −20°C to +50°C on the HBD-R series with 6,000 cycles at 90% depth of discharge, seamless on-grid and off-grid switching as standard, aerosol fire suppression to CE on smaller models and off-gas detection with a water spray inlet on larger units. Published warranty terms are 3 years or 1.6 MWh per kWh for the system and 5 years or 2.57 MWh per kWh for battery performance.
On a unit cycling daily the throughput allowance is reached before the calendar term. Storage also does not increase peak capability: if the generator was undersized for a starting load before, the combination has to be sized to cover that too.
Hiring Before Buying
For an operator uncertain whether the arrangement suits its sites, hiring a unit for one project answers the question with real data rather than a projection. Fuel consumed before and after, service intervals achieved and the number of quiet hours actually covered are all measurable within a few weeks.
MPMC describes the HBD-R series as purpose-built for the rental market with ruggedised design and easy maintenance, which means the same product is available through hire channels as well as purchase. Where a trial is run, recording the baseline fuel consumption before the unit arrives is the step most often skipped and the one that makes the comparison credible.
Hybrid Configuration Checks
• Confirm controller compatibility against the specific set already on site.
• Log the load profile over a representative period rather than taking a spot reading.
• Size rated power and capacity separately against quiet load and quiet duration.
• Agree the engine start threshold and the load point it holds while running.
• Specify any reserved state of charge held back for generator failure.
• Confirm the recharge window and the spare generator capacity available.
• Request derated output at the site's ambient and altitude.
• Have the dispatch behaviour demonstrated at commissioning, not described.
https://www.mpmc-group.com/
MPMC Powertech Corp.