Coulomb Puts Megawatt Charging on Both Ends of Mobile Storage

Coulomb Solutions (CSI) is adding Megawatt Charging System support on both the input and output sides of its newest-generation Mobile Battery Energy Storage Systems, letting the units be rapidly recharged over an MCS connection and deliver high-power output.

Coulomb Solutions, known as CSI, is putting Megawatt Charging System hardware on both ends of its newest mobile battery energy storage systems. The optional architecture places an MCS connection on the input side, so the unit can be refilled quickly, and on the output side, so it can push high power back out to whatever needs it. In practice that turns a battery on wheels into something closer to a portable megawatt-class charging node.

The company, which sells commercial electrification and energy storage products, described the change as an option on its latest generation of mobile storage rather than a wholesale redesign. But the two-sided approach is the point. A mobile battery that can only be charged slowly is a logistics problem; one that can be topped up over the same high-power standard it discharges through can be cycled in and out of service on a schedule that matches how freight actually moves.

What the Megawatt Charging System is meant to solve

MCS is the connector and communication standard developed for vehicles that cannot be refuelled in the time a passenger car takes to charge — Class 8 tractors, mining haulers, port equipment, and increasingly electric aircraft ground support and marine applications. The existing CCS standard used by cars tops out well below what a long-haul truck needs if it is to recharge inside a driver's mandated rest break. MCS was written to close that gap, with a physically larger inlet, heavier cooling and a power envelope aimed at the megawatt scale its name implies.

The bottleneck is rarely the truck. It is the service drop. A depot that wants several megawatt-class dispensers is asking a utility for an interconnection that can take years and a substation-sized capital budget. That timing mismatch — fleets electrifying faster than distribution circuits can be upgraded — is the commercial opening that mobile and buffered storage products are built for.

Why putting MCS on both sides changes the use case

Buffered charging is not new. Drop a battery between a weak grid connection and a fast dispenser, trickle it full overnight at low amperage, and discharge it hard when a vehicle arrives. What CSI is describing goes further: the storage unit itself accepts MCS input, meaning it can be recharged from a megawatt-capable source rather than only from a slow feed.

That opens a few configurations that a single-direction unit cannot do:

• Swap-in service. A depleted unit is trucked out, a full one is trucked in, and the depleted one is refilled somewhere with grid capacity — a model that decouples charging power from the site entirely.
• Fast turnaround at temporary sites. Construction, film production, disaster response and event power all need high output for short windows with no permanent interconnection.
• Bridging capacity while an interconnection is pending, then redeploying the asset elsewhere once permanent infrastructure lands — an important detail, because it means the hardware is not stranded.
• Vehicle-to-vehicle style rescue, where a stranded or under-charged heavy truck is served in the field.

The last point matters more than it sounds. One of the persistent objections to electrifying heavy trucking is what happens when a vehicle runs low far from a depot. A mobile unit that can dispense at MCS power is the closest analogue to a fuel truck the sector has produced.

A crowded field forming around megawatt-class charging

CSI is not alone here. The competitive set spans several distinct camps: charging hardware makers extending their product lines upward into MCS; battery integrators packaging cells, thermal management and power electronics into containerised or trailer-mounted units; utilities and independent power developers building depot-scale charging as a service; and truck OEMs that would rather control the charging experience than leave it to third parties. Mobile storage specialists sit across all of them, selling into the gap the fixed-infrastructure players cannot fill quickly.

The announcement was reported by Charged EVs. CSI did not disclose pricing, capacity or availability timing for the MCS option in the material summarised there, and the company is not publicly listed, so there is no share-price read-through to the news.

The metals bill behind every megawatt on wheels

Every one of these units is a demand signal for the battery supply chain. Mobile storage tends to favour lithium iron phosphate chemistry, where the constraint is lithium and graphite rather than nickel and cobalt, though high-power discharge duty cycles put unusual thermal and cycle-life demands on the pack that can push designers toward different cell choices. The copper content is also non-trivial: megawatt-class cabling, liquid-cooled connectors and the power conversion stage all consume conductor at a rate well above a passenger-car charger.

That is the broader arithmetic worth keeping in view. Heavy-duty electrification does not just move fuel demand into electricity demand; it front-loads a materials order — cells, conductors, power semiconductors — years before the trucks themselves reach scale. Buffered and mobile storage effectively duplicates part of that order, because the energy is stored twice: once in the stationary or mobile buffer, once again in the vehicle.

Markets on the day

The news landed during a soft session for US equities. As of the last trade at 16:32 GMT on 1 September 2026, the S&P 500 tracker (NYSEARCA: SPY) was at $762.01, down 0.66% from a prior close of $767.05, with a day range of $761.17 to $764.67. The Nasdaq 100 tracker (NASDAQ: QQQ) was weaker at $708.36, off 1.17% against a $716.76 close and trading between $705.62 and $712.30. The Dow tracker (NYSEARCA: DIA) sat at $527.72, down 0.72%.

Those moves say nothing specific about heavy-duty charging, but they set the financing backdrop. Mobile storage is capital equipment, and the customers buying it — fleets, contractors, charging developers — are sensitive to the cost of borrowing. A risk-off tape in growth-heavy indices is the environment in which capital-intensive electrification projects get re-phased rather than cancelled.

What to watch from here

Three things will determine whether bidirectional MCS becomes a category or a footnote. First, interoperability: MCS is a standard, but real-world handshakes between one vendor's storage unit and another's vehicle are where deployments stall. Second, the economics of the swap model — whether the cost of physically moving a full battery to a site beats the cost of waiting for an interconnection. Third, utility programmes. If regulators start crediting mobile storage for the grid services it can provide when idle, the asset earns money between charging jobs, and the payback maths changes materially.

For now, the signal is directional: the industry is designing around the assumption that grid capacity will lag heavy-duty EV adoption for years, and building hardware that treats that lag as a permanent market rather than a temporary inconvenience.

Key facts

• Company: Coulomb Solutions (CSI), private; commercial electrification and energy storage products
• What changed: Optional MCS support added on both input and output sides of its newest-generation Mobile Battery Energy Storage Systems
• Capability: Rapid recharge via an MCS connection plus high-power MCS output
• Market backdrop: SPY $762.01, -0.66%; QQQ $708.36, -1.17%; DIA $527.72, -0.72% — as of 16:32 GMT, 1 Sep 2026

Frequently asked questions

What is the Megawatt Charging System?

MCS is a charging connector and communication standard created for vehicles that need far more power than passenger cars — Class 8 trucks, mining and port equipment, and some marine and aviation ground uses. It uses a larger, liquid-cooled inlet and is designed to deliver megawatt-scale power so a heavy truck can recharge within a driver's rest break.

What did Coulomb Solutions actually announce?

CSI said it is adding MCS support to its newest-generation Mobile Battery Energy Storage Systems as an optional architecture. Crucially, the MCS interface sits on both the input and the output side, so the unit can be rapidly recharged through an MCS connection and can also deliver high-power output through one.

Why does having MCS on both sides matter?

A storage unit that only discharges at high power still has to be refilled slowly, which limits how often it can be cycled. Accepting MCS input means the battery itself can be topped up from a megawatt-capable source, enabling swap-in service, fast turnaround at temporary sites, and redeployment once a permanent grid connection arrives.

Is Coulomb Solutions a publicly traded company?

No. Coulomb Solutions is a private company, so there is no listed share price or ticker tied to this announcement. Investors looking for exposure to the heavy-duty charging buildout have to look at listed charging hardware makers, battery integrators, power-electronics suppliers and the metals feeding the supply chain instead.

Who competes in mobile megawatt-class charging?

The field spans charging hardware companies moving upmarket into MCS, battery integrators building containerised or trailer-mounted packs, utilities and independent developers selling depot charging as a service, and truck manufacturers that want to own the charging experience. Mobile storage specialists sell into the gap fixed infrastructure cannot fill quickly.

What is the main constraint on heavy-duty EV charging?

Grid interconnection, not vehicle technology. A depot wanting several megawatt-class dispensers needs a utility service upgrade that can take years and substantial capital. That mismatch between fleet electrification timelines and distribution capacity is precisely the gap mobile and buffered battery storage products are designed to bridge.

Sources

• Coulomb introduces bidirectional MCS capability for its mobile battery energy storage systems — Charged EVs

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