Yiya kumxholo 
Dutch contractors can use a MegSolid ESSA cabinet or ESSC container to turn a limited overnight connection into the higher daytime power needed by electric machinery, provided the available supply can restore the battery before the next shift.
- 3×80 A at 400 V: about 55 kW before other site loads.
- Medium excavator: roughly 200–400 kWh per working day.
- CCS2 fast charging: often more than 100 kW.
Match the MegSolid System to the Construction Duty
Machine duty determines the useful power class. The Uthotho lweekhabhathi zangaphandle zeMegSolid ESSA covers 30–100 kW and 55.296–215.04 kWh, giving smaller sites a compact way to buffer one machine, staggered charging or short daytime top-ups. Sites charging several large machines from one fixed hub can move to the ESSC containerized energy storage series, starting with the 500 kW / 1.0752 MWh ESSC0500B-1075.
| Construction duty | Preliminary MegSolid direction | Limit to check |
|---|---|---|
| Tools, small machines or a short charging peak | ESSA0030B-0055 or ESSA0050B-0055 | 55.296 kWh rated energy may cover only a short part of the shift demand |
| Staggered charging for one medium machine | ESSA0050B-0100 or ESSA0100B-0215 | Charger demand must remain within 50 kW or 100 kW rated AC power |
| Several cabinets added as the fleet grows | Parallel ESSA configuration | Site protection, controls and available charging energy must be designed for the combined system |
| Fixed hub serving several large machines | ESSC0500B-1075, 500 kW / 1.0752 MWh | The 6 m, 21,000 kg container needs planned access, lifting and connection work |
| Charging demand above roughly 1.5 MWh | Multiple ESSC0500B-1075 units or the 1 MW / 2.1504 MWh ESSC1000B-2150 | Transformer, switchboard and grid limits decide how much power can be used |
Rated battery energy is not the amount that reaches the machine. A 215.04 kWh cabinet must retain its operating SOC limits and supply the PCS, cooling and other auxiliaries before charger losses are considered. An excavator that needs 200 kWh at its battery cannot be paired with a 215.04 kWh nameplate by simple subtraction.
Both MegSolid product families connect at a 400 V AC boundary. CCS2 chargers, Powerlock distribution and interchangeable machine batteries remain separate parts of the construction charging system. The storage system determines where the power comes from; the charger determines how that power reaches the machine.
Convert the Site Connection from Amps to Kilowatts
Amperes hide the number that matters during charging. At a balanced 400 V three-phase connection, the theoretical real power at unity power factor is:
Grid power = √3 × 400 V × current × power factor
| Site connection | Theoretical power at PF = 1 | Practical reading |
|---|---|---|
| 3×63 A | 43.6 kW | Little room remains after pumps, lighting and site cabins are supplied |
| 3×80 A | 55.4 kW | Suitable for slow overnight charging when other loads leave enough headroom |
| 3×125 A | 86.6 kW | Still below the input demand of many high-power charging sessions |
These figures are electrical ceilings, not guaranteed charging power. Cable ratings, voltage, power factor, switchgear limits and the loads already running on the connection reduce the available headroom. Details on checking the AC path are covered naturally in the 400 V BESS switchboard connection requirements.
The required BESS power is calculated at the same AC boundary:
Required BESS power = simultaneous charger input + other site load − permitted grid import
Consider a charger drawing 120 kW from the AC bus while pumps, cabins and temporary distribution use another 20 kW. A 3×80 A connection supplies no more than about 55 kW under ideal conditions, leaving an 85 kW shortfall before an engineering margin is added. The 100 kW ESSA0100B-0215 enters the right power class for that operating point, but its energy capacity still needs a separate test.
Calculate the Energy Required Before the Next Shift
Power tells the contractor whether the charging session can start. Energy tells the contractor whether the machine will finish the next shift. Mixing those two values is how a 100 kW / 215.04 kWh cabinet gets approved for a job that needs 300 kWh every night.
TNO field measurements show how quickly the numbers grow. Reported 17 tonne and 35 tonne excavators used about 28 kWh and 52 kWh per operating hour, while measured daily consumption varied with demolition and civil work. The Dutch construction-site equipment measurements provide a firmer starting point than engine nameplate power alone. The Hague study reached the same practical conclusion: working phase, operating hours and charging strategy change the grid requirement.
Daily energy should be assembled from the actual machines scheduled for that shift:
Required machine energy = Σ(machine operating hours × measured kWh per hour) + planned midday top-ups
The BESS must deliver that energy through an AC system and a separate charger. Its preliminary nameplate requirement can be expressed as:
BESS rated energy = required AC delivery ÷ usable SOC fraction ÷ discharge-path efficiency + operating reserve
Keep the inputs separate. Rated battery energy, permitted SOC window, PCS losses, auxiliary consumption, charger losses and the machine battery’s accepted energy describe different boundaries. The BESS power and energy method used for limited-capacity charging sites follows the same boundary discipline.
Return to the 120 kW charging example. The grid has about 35 kW left after the assumed 20 kW site load, so the BESS supplies approximately 85 kW. A two-hour session requires about 170 kWh at the BESS AC output. Only 45.04 kWh separates that duty from a 215.04 kWh nameplate before the usable SOC window, conversion losses, auxiliaries and reserve are deducted. The ESSA0100B-0215 may pass the 100 kW power test and still fail the two-hour energy test.
Longer charging sessions or a second machine move the project toward parallel cabinets or the 1.0752 MWh ESSC0500B-1075. That decision should follow the measured shift schedule; adding containers cannot repair an energy estimate built from machine battery labels alone.
Turn Night-Time Grid Power into Day-Time Charging Power
Battery buffering works when time is available. The site draws a modest amount of power for several hours, stores the energy, then releases it during a shorter charging event that the connection could not supply on its own.
The overnight recovery limit is:
Recharge energy = (permitted grid import − overnight site load) × charging hours × charging-path efficiency
Suppose a 3×80 A connection provides a theoretical 55 kW and the security system, cabins, pumps and other overnight loads consume 15 kW. The BESS receives no more than 40 kW before losses. Twelve hours provides 480 kWh of theoretical charging energy; the energy stored in the battery will be lower after the charging path and auxiliaries are included.
One machine using 300 kWh during the day may fit inside that recovery window. Two machines using 300 kWh each create a 600 kWh daily requirement, so the connection falls further behind every night. A larger container gives the crew more days before depletion, but it does not balance the daily energy budget. The Dutch grid-capacity and BESS recharge calculation explains why available charging headroom can be a harder limit than battery nameplate capacity.
Construction schedules rarely stay fixed. Rain changes excavation hours, late concrete deliveries move crane work, and a machine returning with a lower SOC consumes more energy that night. The EMS should keep the site below its import limit while protecting the energy needed for the next shift. Similar timing conflicts appear in fleet charging with a fixed departure deadline, although construction machinery follows work phases instead of a daily vehicle route.
MegSolid ESSA systems provide interfaces for the grid, load, battery, PV and diesel generation within the system architecture. Verified solar production can increase the daytime energy budget, while a generator can recharge the BESS during a controlled operating period. The EMS still needs one clear priority: protect the site connection, complete the required machine charging, then use any remaining capacity for lower-priority loads.
Choose the Charging Layout Before Finalizing Capacity
Project duration and machine movement decide where the battery should sit. Six months of housing construction with a usable grid connection needs a different layout from a three-night runway closure where every charged kilowatt-hour arrives by truck.
| Imeko yendawo | Charging layout | Where MegSolid fits |
|---|---|---|
| Small grid connection remains available throughout the project | Grid + BESS + site distribution + machinery chargers | ESSA stores overnight energy and supports daytime peaks |
| Several machines return to one depot or compound | Fixed charging hub with managed chargers | Parallel ESSA cabinets or an ESSC system supply the common AC bus |
| Grid power is unavailable at the work face | Charged battery system or interchangeable machine packs brought from a depot | Use a transport-approved mobile system; keep a standard ESSC installation fixed unless its project documents cover repeated transport |
| Machine battery packs can be removed | Pack swapping with centralized charging | ESSA or ESSC supplies the depot chargers according to the combined pack schedule |
| Fuel remains available during the transition | Generator charges the BESS during planned periods; BESS serves variable site loads | ESSA can coordinate grid, PV, generator, battery and load connections within the approved system design |
The first arrangement makes the best use of a 3×63 A, 3×80 A or 3×125 A connection that would otherwise sit partly unused overnight. The second works when machines can return to one location without losing productive time. Remote work faces often need the third or fourth arrangement because moving a crawler excavator to the charger can consume more time and energy than moving the charged battery.
Generator-assisted charging needs a controlled operating sequence. Running the generator near an efficient loading point for a defined period can reduce low-load running, while the BESS absorbs the energy and handles the changing construction load. Reverse-power protection, minimum generator loading and PCS setpoints still have to agree; the control relationship is explained in the BESS and diesel-generator operating sequence.
Nearby infrastructure can also supply energy. Dutch projects have used charging plazas, depot connections and existing transport power systems where a new construction connection would arrive too late. The charging layout should identify the physical source of every daily kilowatt-hour before any cabinet quantity is frozen.
Use Dutch Projects to Set a Realistic Energy Class
The Hague: Smart Charging Reduced the Connection Peak
Researchers modelled a 388-home construction project in The Hague using fully electric non-road mobile machinery. The assumed site connection was 206 kW, and the machinery was charged at 50 kW DC. Plugging every machine in after work pushed the required connection toward 300 kW during the busiest construction phase.
Smart charging reduced that phase’s peak by 46%. The model found that battery storage above 1,500 kWh could bring the required connection down to the more readily available 3×80 A class, or about 55 kW. Those results do not make 1,500 kWh a universal rule. They show why a contractor charging several large machines may pass beyond the ESSA cabinet class and need multiple ESSC0500B-1075 units or the 2.1504 MWh ESSC1000B-2150. The full calculation appears in the The Hague construction-machinery charging study.
A16 Rotterdam: Moving the Energy Saved Machine Travel
The A16 Rotterdam project used a 25 tonne excavator with a 320 kWh battery that could work for roughly eight to ten hours. Around 20 electric machines operated across the wider project. Most returned to charging areas, but moving the large crawler excavator wasted too much time. The team brought a battery in a three-metre container to the machine, returned that battery to the charging plaza each night and sent it out again the following day. Rijkswaterstaat’s A16 Rotterdam construction-site account also records 44 kW AC charging points used for overnight charging.
The engineering lesson is physical: charger location can matter as much as battery capacity. Fixed ESSC hubs suit machines that return to one compound. Work faces spread over kilometres may need smaller movable energy blocks or machine-pack swapping instead.
Schiphol: 1.2 MWh Supplied an Electric Asphalt Train
Heijmans and DENS used a 1.2 MWh mobile charging plaza during runway work at Schiphol. The system arrived charged, operated without a grid connection, and combined six CCS2 chargers with Powerlock outlets so machines and interchangeable packs could charge on site. The Schiphol electric asphalt-train project shows what a multi-machine duty looks like in practice.
Its energy class sits close to the 1.0752 MWh ESSC0500B-1075, but the delivery formats differ. The Schiphol unit was built as a mobile charging plaza with integrated charging hardware. ESSC systems supply a 400 V AC system boundary, so the project EPC must add the required CCS2 chargers, Powerlock distribution, protection and transport arrangement.
Check Transport, Placement and Protection Before Ordering
Energy density does not remove the logistics. MegSolid ESSA cabinets range from about 2,000 kg for the 30 kW / 55.296 kWh model to 3,900 kg for the 100 kW / 215.04 kWh model. Moving one between project phases requires suitable lifting points, vehicle access, a level base and a repeatable electrical isolation procedure.
The ESSC0500B-1075 measures 6,058 × 2,438 × 2,896 mm and weighs approximately 21,000 kg. Its 500 kW output also corresponds to 722 A rated AC current at the product boundary. Those numbers affect crane selection, cable routing, switchboard current, working clearances and the ability of construction traffic to pass the installation. Frequent daily relocation belongs to a transport-engineered mobile charging product, while ESSC works as a fixed hub that may be moved when a project phase changes.
Both the ESSA and ESSC series carry an IP54 enclosure rating and use intelligent air cooling. Their listed operating range is 0–45°C with non-condensing humidity. IP54 does not permit the installer to ignore standing water, mud, blocked air paths or condensation after a cold night. The broader commercial BESS site-environment checks connect enclosure and cooling data to drainage, dust, salt, heat and noise at the installation point.
Fire protection also changes the site plan. ESSA documentation lists aerosol or Novec 1230 options, while the ESSC series lists FM-200 or Novec 1230. Detection, suppression, emergency access, separation from occupied cabins and fire-service response still need one coordinated layout. Dutch PGS 37-1 addresses the safe use of lithium-based energy storage systems and should be applied through the project’s risk assessment and local approval route. The current PGS 37-1 energy-storage safety guidance is the correct source for the applicable measures; a generic distance copied from another site is not an installation design.
Keep the Charger Interface Outside the Battery Rating
“500 kW BESS” describes power at the storage system’s AC boundary. It does not mean the container contains a 500 kW CCS2 charger, and it does not confirm that the machine will accept 500 kW. Each part of the chain has a separate job.
| System part | Job on the construction site | Rating that matters |
|---|---|---|
| Grid connection and transformer | Supply continuous site power and recharge energy | Amperes, kVA, voltage and permitted import |
| MegSolid BESS and PCS | Store energy and support the AC bus during charging peaks | Rated AC kW, rated kWh, current and SOC limits |
| Site switchgear | Isolate and protect each source and load | Continuous current, fault level and protection settings |
| Iinkonzo zonyango ezingxamisekileyo | Hold import below the site limit and schedule battery recovery | Meter location, response logic and service priority |
| CCS2 charger | Convert AC power into controlled DC charging for the machine | AC input, DC output and connector protocol |
| Powerlock distribution | Provide a temporary high-current connection between approved equipment | Voltage, current, cable and interlock rating |
| Machine BMS | Accept or reduce charging power according to battery condition | SOC, temperature, voltage and charge-acceptance limit |
Suppose an ESSC0500B-1075 feeds several chargers with a combined 600 kW nameplate. The EMS must cap their actual input according to available grid power, BESS power, other site loads and remaining SOC. Charger scheduling can give a nearly empty excavator priority while delaying a machine that will not work until the afternoon. The BESS EMS priority logic for reserve and charging shows how one battery can serve several duties without promising the same power and energy to all of them at once.
Connection drawings should show the meter, grid incomer, BESS breaker, charger breakers, emergency isolation and machine interfaces. That single-line boundary prevents a common procurement failure: the container arrives with sufficient kW and kWh, but the site has no compatible route for delivering either value to the machinery.
Recognize the Sizing Mistake Before It Stops the Site
Dutch public construction buyers are increasing the share of work that must be completed without local emissions. Rijksvastgoedbedrijf made the SEB requirements standard across its construction and maintenance projects in February 2026, requiring 30% to 70% of the work to be carried out emission-free. Its stated direction is to see almost no diesel machinery on its construction sites by 2030. The RVB zero-emission construction requirements turn charging availability into a tender-delivery issue.
| Selection mistake | What happens on site |
|---|---|
| PCS power is below the simultaneous charging deficit | The charger reduces output or another load must be disconnected |
| Battery energy covers the first charging event only | Machinery reaches the afternoon or next morning without the required SOC |
| Night-time recovery is omitted | The BESS loses usable SOC from one working day to the next |
| Machine and charger interfaces are assumed | The storage system arrives without a compatible charging route |
| Transport weight is checked after ordering | Each project move needs unplanned lifting, haulage and electrical work |
| Site loads are excluded from the calculation | Cranes, pumps or cabins push the grid incomer above its limit |
| Fire access is added after the compound is laid out | The selected position conflicts with traffic, cabins or emergency access |
SSEB support can help Dutch companies buy, lease or develop zero-emission construction equipment and related innovation, but eligibility does not prove that a charging design can finish the shift. The 2026 SSEB conditions for construction equipment should be checked separately from battery power, energy and connection calculations.
Equipment selection also sits inside the wider Inkqubo yokuyila yesistim yokugcina amandla ebhetri ye-C&I. Transformer capacity, switchgear, protection, EMS control and commissioning determine whether the cabinet rating can be used at the point of connection. Buying more battery does not remove those electrical limits.
Choose the System From One Working Day
Three numbers settle the first product decision: the highest simultaneous AC charging deficit, the energy the machines must receive before work resumes, and the energy the available sources can restore before the next cycle.
ESSA cabinets suit smaller duties where 30–100 kW of battery power closes the charging gap and 55.296–215.04 kWh covers a verified delivery window. Parallel ESSA cabinets give a fixed depot room to grow when the charging schedule can be divided across machines. ESSC0500B-1075 moves the site into a 500 kW / 1.0752 MWh class for multi-machine charging, while ESSC1000B-2150 provides a 1 MW / 2.1504 MWh direction for duties closer to The Hague scenario above 1,500 kWh.
Connection size alone cannot choose between them. Sites with a 3×80 A connection and twelve quiet charging hours may recover more useful energy than a 3×125 A site that remains heavily loaded overnight. Machine movement can also overturn the electrical answer: a fixed MWh hub only works when machines or interchangeable packs can reach it without disrupting the shift.
The selected system must leave the contractor with a workable day. Charging finishes before the machine is needed, the import limit remains protected, and the next night contains enough time to replace the energy used.
Imibuzo Ebuzwa Rhoqo
Can a 3×80 A connection charge an electric excavator?
It can provide about 55 kW at 400 V and unity power factor before site loads are deducted. Slow overnight charging may cover one machine when enough hours and grid headroom remain. Fast charging above that residual power needs BESS support or another energy source.
How is the required BESS power calculated for construction equipment?
Add the simultaneous AC input of the active chargers to cranes, pumps, cabins and other site loads, then subtract the permitted grid import. The remaining kW is the minimum BESS power deficit before engineering margin and transient checks.
How is the required BESS energy calculated?
Start with the energy each machine must receive before its next working period. Convert that requirement to the BESS AC boundary, then account for the usable SOC window, conversion losses, auxiliaries and operating reserve. Daily machine kWh and simultaneous charging kW require separate calculations.
Is the 100 kW / 215.04 kWh ESSA cabinet enough for one excavator?
The answer depends on the machine’s measured daily energy and charging schedule. A 200 kWh requirement leaves little room below a 215.04 kWh nameplate once SOC limits and losses are included. The cabinet may be suitable for a shorter top-up even when it cannot provide a complete recharge.
When should a contractor consider the ESSC0500B-1075?
Its 500 kW / 1.0752 MWh class fits fixed hubs serving several machines, longer charging windows or duties beyond practical ESSA combinations. Site access, the 21,000 kg weight, transformer capacity, switchboard current and daily recharge energy must all support the selection.
How long does a 3×80 A connection need to recharge a 1.0752 MWh system?
Dividing 1,075.2 kWh by the theoretical 55.4 kW connection gives about 19.4 hours before site loads and losses. Only 40 kW of overnight headroom extends the theoretical time to about 26.9 hours. A fully depleted MWh-class system cannot normally be restored during one short night from that connection.
Does a MegSolid construction-site BESS include CCS2 chargers or Powerlock outlets?
MegSolid ESSA and ESSC ratings describe the storage system and its 400 V AC boundary. CCS2 chargers, Powerlock distribution, cables, protection and machine communication belong to the site charging package and must be selected for the machinery.
Can ESSA and ESSC systems be moved every day?
ESSA cabinets weigh approximately 2,000–3,900 kg, while ESSC0500B-1075 weighs about 21,000 kg. They can be relocated with planned lifting, transport and reconnection work. Daily movement calls for equipment engineered and approved as a mobile charging system.
Can construction-site solar recharge the BESS?
Verified PV production can charge the battery or supply site loads. The EMS must prevent PV charging from competing with machinery charging, reserve requirements or the grid-import limit. Cloudy-day production should be included in the operating study.
Can a diesel or HVO generator charge the BESS?
Yes. A generator can run during planned periods while the BESS stores energy and handles changing loads. Minimum generator loading, reverse-power protection, PCS commands and the transition between operating modes must be coordinated.
Why is construction equipment charging a specific problem in the Netherlands?
Electric machinery is being introduced while many projects have small or delayed grid connections. Machinery batteries require hundreds of kilowatt-hours, and several chargers can exceed the available connection when they start together. Dutch grid congestion makes waiting for a larger temporary connection a programme risk.
How do SEB and SSEB affect a construction-site battery decision?
SEB sets the direction and procurement requirements for cleaner, emission-free construction. SSEB provides financial support for qualifying equipment, retrofits and innovation. The project still needs an electrical design proving that the selected BESS can charge the machinery on schedule.
Which Dutch projects show how battery charging works on construction sites?
The Hague study quantified smart charging and temporary storage, the A16 Rotterdam project moved a battery to a crawler excavator, and the Schiphol runway project used a 1.2 MWh mobile charging plaza for an electric asphalt train. Together they show that machine movement and charging time matter alongside kW and kWh.
