SLOW IN FROM THE GRID
Charge the battery inside your connection limit
The battery charges continuously at a low, flat rate – the rate your existing connection already delivers, without upgrades or peak tariffs.
solutions
Fast Charging at Scale
Fast charging – without waiting for the grid.
You’ve already priced the grid upgrade. Six figures. Twelve months. Maybe eighteen. Monbat Energy’s BESS + EMS lets you deploy DC fast charging inside your existing grid connection starting this quarter, not next year.
HOW IT WORKS
How BESS + EMS turn a slow grid connection into fast charging
The grid doesn’t need to deliver fast-charging power. The battery does. The EMS orchestrates the handoff invisibly to the driver, fully within your connection limit.
FAST OUT TO CHARGERS
Deliver high power on demand
When a vehicle plugs in, the EMS releases stored energy at full charger power. A 400 kW connection can run a 1.2 MW charging session.
DYNAMIC LOAD MGMT
Multiple vehicles, one connection
The EMS monitors every charger and every vehicle. Power is distributed, prioritised and adjusted in real time – no tripped breakers.
OCPP COMPATIBLE
Works with the chargers you already use
AC and DC Charging Apps integrate OCPP-based stations from most manufacturers. No lock-in existing backends and billing keep running.
PV-AWARE
Cheaper per kWh when paired with solar
If you have rooftop PV, the EMS routes solar into charging sessions first lowering cost per kWh and improving ROI on both assets.
How a Central European logistics depot electrified 12 trucks without a grid upgrade
EV Fleet Fast Charging
Charge Point Operator
CHALLENGE
Limited Grid Power
The charging site requires 600 kW to support current and future demands. The existing grid connection is limited. Expanding the grid connection would require significant infrastructure updates with estimated cost of €267k.
SOLUTION
783 kWh BESS + integrated EMS
MONBAT Energy EOM 780 enables DC fast charging with the EMS configured to Peak Shaving, Dynamic Tariffs and Dynamic Load Balancing for charging stations. Three weeks from installation to live operation.
RESULTS
From Concept to Go-Live in 6 Months
A major achievement driven by outstanding teamwork, decisive project management and relentless focus. From planning to
commissioning, the entire project was delivered in only six months bringing value to the business faster than expected.
- -38% Energy Cost
- €276k Grid upgrade avoided
- 4.8 yrs Payback
Run these numbers against my site
PRODUCTS
The hardware and the intelligence, from one supplier.
Fast charging without a grid upgrade isn’t a clever product. It’s a tightly engineered stack – battery, power conversion, charger integration, and intelligence – that has to work as one. We build all four.
The questions your fleet manager, your CFO, and your DSO are going to ask
Answered directly. If we haven’t covered what you need, a 30-minute call with an engineer will.
How many fast chargers can one BESS support?
It depends on charger power, vehicle dwell time and your charging pattern, not just on battery size. As a rule of thumb, an EOM 260 supports roughly 2-3 simultaneous 150 kW sessions under realistic duty cycles; smaller sites are covered by the EOM 115 or EOM 215, and higher-throughput sites by paralleling multiple EOM 260 cabinets. We size the system against your actual charging profile, not against nameplate charger power.
What happens when the battery is depleted?
The EMS ramps charging power down gracefully rather than cutting off mid-session. It prioritises vehicles by state of charge, dwell time, or operator rules, and coordinates with incoming grid power so chargers keep delivering at the rate the grid can sustain until the battery recovers. For 24/7 operations, the system is sized so this doesn’t happen under normal load.
Is this compatible with my existing chargers?
Yes, in almost all cases. The EMS integrates OCPP-based AC and DC chargers from most major manufacturers. If you’ve already installed chargers, we retrofit the BESS and EMS behind them. If you’re specifying a new site, we help you pick compatible hardware and avoid proprietary lock-in.
Can it integrate with an existing or planned PV system?
Yes. The EOM range integrates PV DC/DC modules inside the same housing, connecting panels directly to the battery DC bus – higher round-trip efficiency than routing through a separate AC inverter. The Self-Consumption Optimization and Grid-Supportive Charging apps route PV energy into charging sessions when it’s available, lowering your cost per kWh delivered.
How does the payback compare to a grid upgrade?
A grid upgrade is pure capex with zero operational return – you pay once and still pay the utility every month. A BESS + EMS is a revenue-generating asset: it avoids the upgrade capex, cuts peak-demand charges, lets chargers earn session revenue, and stacks peak shaving, PV self-consumption, and flexibility trading on top. For most charging sites we evaluate, payback falls in the 4-7 year range before a grid upgrade would even have been energised.
What if my fleet or site grows?
The range is modular. You start with the cabinet that fits today EOM 115, or EOM 260 and parallel additional cabinets as throughput grows. The EMS handles the coordination transparently and the DC Charging App scales with the hardware. You add capacity – you don’t rebuild.
Will this work for a public charge point operator (CPO) business?
Yes, and it’s often the architecture that makes a CPO site viable where the grid won’t cooperate, removing the single biggest capex and timeline risk in new-site development. For operators running multiple sites, the EMS provides centralised monitoring and control, plus compatibility with OCPP-based billing and roaming platforms.
A site engineer. A charger plan. A number you can defend.
Tell us your site and your charging ambition. We’ll come back with a sized system, a grid-impact assessment, and a capex-vs-upgrade comparison – whether or not you ever work with us.
- No obligation
- Response within 72h
- Site-specific sizing & capex comparison
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