Split-Type vs Integrated DC EV Charging: Which Design Fits Your Project?

If you are planning a commercial DC charging project, the architecture decision can change far more than the charger price. It can affect civil work, DC cable runs, service access, future expansion, power sharing and the number of charging bays you can operate efficiently. This guide helps EPCs, site owners and fleet operators decide when an integrated DC charger is the simpler investment and when a split-type system can create more value. It also shows what to ask suppliers before you lock the layout or request a quotation.

Quick answer: choose the architecture that gives the lowest total installed and operating risk for your site, not the one with the biggest power number. Integrated DC chargers are often attractive for compact sites and phased rollouts. Split-type systems can be more attractive when many bays need to share a central power pool, when vehicle-facing equipment should stay smaller, or when future expansion is important. Compare the complete site layout, not only cabinet price.

If you are still deciding whether the site needs AC charging, DC fast charging or a mixed layout, first read AC vs DC charging for commercial sites. Then use the commercial EV charging infrastructure buyer's guide to connect charger architecture with site power, software, installation and operations.

1. What Is an Integrated DC Charger?

An integrated DC charger is also called an all-in-one DC fast charger. The main power-conversion equipment and the vehicle-facing charging interface sit in the same outdoor cabinet. Depending on the model, one cabinet can have one or two DC charging outputs. The charger takes AC power from the site, converts it to controlled DC power, and sends it to the vehicle.

This layout can be easier to plan when the charging area is compact. There is no long DC cable route between a separate power cabinet and a remote dispenser. But the cabinet still needs safe access, airflow, vehicle impact protection and a suitable electrical connection.

When an integrated DC charger makes sense

Consider an integrated design for a small retail car park, a hotel, a service station with limited charging bays, or a first-stage commercial project. It can also suit a site where equipment must stay close to the vehicle. The best option still depends on the exact power rating, local electrical work and future expansion plan.

For example, SINELINK lists a 60–120 kW integrated DC charging station with configurable connector options and dual charging outputs. Its 240–400 kW high-power integrated DC fast charger also uses a single cabinet architecture with two DC output channels. Always check the selected model and ordered configuration; two outputs do not mean two vehicles each receive the full cabinet rating.

2. What Is a Split-Type DC Charging System?

Illustrative architecture comparison only; not a wiring drawing or a SINELINK customer installation.

A split-type DC charging system separates the power cabinet from the dispensers used by drivers. The power cabinet contains the main AC-to-DC conversion equipment. Dispensers are placed near the parking bays. DC power travels between the cabinet and those dispensers through a designed distribution system.

This arrangement can keep larger electrical equipment in a protected service area. It also lets the site place smaller user-facing dispensers around several bays. A shared power pool can serve vehicles with different arrival times and charging needs. However, the site now needs careful DC cable routing, protection, control wiring, commissioning and maintenance planning.

The commercial advantage to understand: one shared power pool

A split-type system can create value when several charging bays do not all need maximum power at the same time. One central cabinet can allocate installed power across multiple outputs instead of forcing the buyer to size every bay as an independent full-power charger. But this only works when the control logic, vehicle mix and peak demand match the project. More dispensers do not create more installed kW.

SINELINK's SEC 480 kW North American split-type DC charging system lists up to three dispensers and six cables with a 360–480 kW platform. Its SEC 1280/480 kW European split-type system offers larger shared-power configurations. These are different market and system configurations. Do not treat them as interchangeable without checking the model datasheet.

3. Split-Type vs Integrated DC Charging: Side-by-Side Comparison

This table is a planning guide, not a universal price or performance ranking. A large integrated charger can serve a demanding site. A split system can also be a poor choice if cable routes are long or the site has too few active vehicles. Ask for a site-specific layout and total installed cost.

4. How Many Charging Bays and How Much Power Do You Need?

Start with vehicles, not with the largest charger in a catalog. Count the vehicles that arrive in your busiest hour. Record how much energy they need, how long they can stay, and when they must leave. Then compare the peak charging requirement with the site's available electrical supply.

Illustrative example: six bays sharing 480 kW

Imagine a charging hub with six connectors and one 480 kW shared power cabinet. In one moment, two vehicles request 160 kW each. Four other vehicles request 40 kW each. The total requested output is 2 × 160 + 4 × 40 = 480 kW. In theory, this equals the cabinet rating. In practice, the system can deliver that exact split only if the ordered equipment, vehicle voltage, current limits, allocation steps and operating conditions allow it. Losses and thermal limits also matter.

Now imagine that all six vehicles request 150 kW at once. The total request becomes 900 kW. The 480 kW cabinet cannot provide 900 kW. The controller must share, reduce or prioritize output according to its approved logic. This is why the number of charging cables must never be used as a substitute for the site power calculation.

Before choosing the architecture, calculate how many charging points the site needs, the energy required per session and the available electrical capacity. See How to Size Your EV Charging Site Without Overspending]. If available site power must be shared across several chargers, continue with Dynamic Load Balancing for Commercial EV Charging]. Site-level load balancing and internal DC power allocation are related, but they are not the same control layer.

5. Installation: Layout, Cable Runs and Electrical Work

Integrated charger installation

Check the AC feeder, upstream switchgear, transformer capacity, foundation, drainage, cooling airflow, access for service teams and vehicle impact protection. A large all-in-one cabinet can occupy valuable space near the bay. The driver also needs a safe cable reach to the vehicle inlet.

Split-type installation

Place the central power cabinet where technicians can reach it safely. Keep cooling and emergency access clear. Then plan each dispenser position and DC cable route. Long DC routes can add cost, voltage drop, heat, cable protection requirements and civil work. The design must also include the correct communication and safety controls between the cabinet and dispensers.

For both layouts, ask the local designer and utility to review the electrical service and applicable rules before equipment is ordered. The power cabinet rating alone does not establish the required transformer size or the site's final grid connection.

6. Maintenance, Uptime and Fault Isolation

SERVICE AND MAINTENANCE

Architecture affects fault isolation and service access.

Use the RFQ to confirm how faults are isolated, which power remains available after a module issue, and what access the maintenance team needs.

Maintenance affects revenue, not only service convenience. With integrated chargers, a fault may remove one cabinet and its associated bays while other independent units remain available. With split-type systems, centralized modules can simplify service access, but the central cabinet can become a larger common dependency. Ask how faults are isolated, what capacity remains after a module failure, and which spare parts must be held locally.

Do not accept a generic 'high uptime' claim. Ask for the failure-response logic, spare-module strategy, remote diagnostics, service access requirements and commissioning test. The best architecture is the one your local team can restore quickly when something fails.

Questions to ask before buying

Can one failed module be isolated without stopping every charging session? What happens if the main controller fails? Can a dispenser fault affect other bays? Is there a documented emergency-stop and safe-isolation procedure? How fast can replacement modules, cables and connector parts reach the site? Ask for written answers and the test plan, not only a brochure claim.

The next topic in this cluster, EV charger power modules and uptime, will examine modular service design in more detail.

7. Power Allocation, Software and Network Compatibility

A split-type system needs clear rules for sharing power. It may use equal sharing, first-come service, vehicle priority or another approved method. Some integrated chargers also share power between two outputs. The buyer should ask how many outputs can charge at the same time and what each vehicle can receive under a realistic mixed-load test.

Also check the connection between the charging equipment and the operator's backend. OCPP helps chargers communicate with a charging management system, but OCPP support alone does not prove that a cabinet can perform a specific internal power-allocation function. Local charger controls and the backend must be tested as one system.

See our EV charging management solutions and the planned OCPP 1.6J vs OCPP 2.0.1 technical comparison for related checks. Confirm the exact protocol version, supported profiles, payment flow, and test results for the ordered charger.

8. Which Design Fits Your Business Model and Expansion Plan?

Use project economics and operating pattern as the filter. A hotel or retail site may value a simpler first phase and lower civil complexity. A highway hub may value many user-facing dispensers, shared power and a protected service zone. A fleet depot may care most about departure deadlines, redundancy and adding bays later. Ask suppliers to compare two feasible layouts against the same vehicle demand and site power assumptions.

9. Build a Shortlist, Then Ask for a Site-Specific Comparison

SINELINK publishes both integrated DC charging products and distributed DC fast charging systems. Use the public ranges to understand the available architectures, then request the approved datasheet and commercial scope for the exact destination market. The shortlist should be based on vehicle demand, available AC supply, bay count, connector requirements, service model, and expansion plan - not only headline kW.

You can review the SEC 480 kW North American split system, the SEC 1280/480 kW European split system and the 1440 kW flexible shared charging system. These published ranges are not promises that every configuration supports every connector, country, vehicle or operating mode. Technical review is required.

10. RFQ Checklist: What to Send Your DC Charger Supplier

A weak RFQ gets a charger price. A strong RFQ gets a project comparison. Ask the supplier to quote the architecture, installation assumptions, power-sharing logic, and expansion path together. Send the following information:

• Destination country, applicable electrical code and requested certification evidence.

• Project type, site drawing, parking-bay count and planned construction phases.

• Vehicle types, connector standards, battery voltage range and expected charging current.

• Expected daily sessions, peak simultaneous vehicles, average energy per session and target dwell time.

• Available AC supply, transformer/switchgear details and measured non-EV site demand.

• Integrated or split preference, proposed cabinet location, dispenser locations and route lengths.

• Preferred allocation rules, payment methods, network/OCPP requirements and operating software.

• Environmental conditions, ventilation, flood/drainage risks and service clearances.

• Warranty scope, spare parts, response times, commissioning tests and future expansion goals.

For an initial technical review, send your site drawing, vehicle mix, available AC capacity, required charging bays and expansion plan to sales@sinelinkenergy.com. Ask SINELINK to compare an integrated and split-type concept where both are technically feasible. You can also review the SINELINK EV charging product hub and EV charging solutions before selecting a model.

11. Final Decision: Choose the System, Not Just the Charger

Choose an integrated DC charger when simplicity, compact installation and independent phased deployment create the better business case. Choose a split-type architecture when several bays can benefit from a shared power pool, smaller vehicle-facing dispensers and a centralized service zone. Neither answer is automatically cheaper. Compare total installed cost, usable charging capacity, maintenance risk and future expansion.

Before placing an order, ask the supplier to show the two things a brochure cannot prove: how the proposed system behaves under your real simultaneous charging demand, and what happens when one important component fails. That comparison is often more valuable than another 40 or 80 kW on the nameplate.

12. Frequently Asked Questions About Split-Type and Integrated DC Charging

What is the main difference between split-type and integrated DC chargers?

An integrated charger keeps the main power-conversion equipment and charging interface in one cabinet. A split-type system uses a separate power cabinet and one or more remote dispensers.

Is a split-type DC charging system always faster?

No. Charging speed depends on available cabinet power, vehicle acceptance, output voltage, connector current and the power-allocation rules. Architecture alone does not set charging speed.

Can six charging connectors each deliver the full 480 kW?

No. A 480 kW shared cabinet has a total output limit. Six connectors share the installed capacity, subject to system and vehicle limits.

Which design is cheaper to install?

There is no universal winner. Compare equipment, electrical upgrades, civil work, DC cable runs, controls, commissioning and maintenance for the actual site.

Can an integrated DC charger charge two vehicles at once?

Some models can. Confirm the number of supported outputs and the power available to each vehicle when both are charging.

Is split-type charging better for a fleet depot?

It can be useful for many bays and shared power. But fleet departure times, vehicle size, DC cable routes and system redundancy must be checked.

Can I add more dispensers later without adding cabinet power?

Only if the ordered platform supports expansion. More dispensers can add connection points, but they do not increase the installed cabinet power.

What should I check before importing a split-type DC system?

Confirm the target market, input supply, connector type, required compliance documents, power allocation, installation layout, cable routes and local service support.