EV Infrastructure

AC and DC EV Charger Supply and Specification

Choosing a DC fast charger supplier — or an AC charger, which suits far more sites than operators expect — comes down to four decisions: connector standard, power band, communication protocol, and how well the unit survives the environment it is installed in. Everything else on the datasheet is secondary.

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Trivonix supplies AC and DC chargers across the commercial power range and specifies them against the site rather than the brochure. Where a client's requirement is genuinely met by a lower-powered unit, we say so.

What this service covers

Open protocol by default: OCPP-compliant hardware so you are not locked into a single management platform for the life of the asset.
Right-sized power: Power band matched to dwell time and vehicle acceptance rate, which is often the real ceiling on charge speed.
Built for the location: Enclosure rating, thermal management and cable handling specified for outdoor, coastal or high-ambient conditions.

AC EV chargers

AC chargers deliver alternating current to the vehicle, and the vehicle's on-board charger converts it. This makes them simpler, cheaper, smaller and far more reliable than DC units — and it also means the vehicle, not the charger, usually sets the ceiling on charging speed.

Typical power bands

Single-phase units in the low single-digit kW range suit two- and three-wheelers and overnight home or residential society charging. Single-phase 7.4 kW suits workplaces and long-dwell parking. Three-phase 11 kW and 22 kW units suit commercial fleets and destination sites, provided the vehicles can actually accept three-phase AC — many cannot.

Where AC is the right answer

Anywhere the vehicle is parked longer than it needs to charge: workplaces, hotels, residential buildings, long-stay car parks and overnight fleet depots. In these settings, more AC points beat fewer DC points on almost every metric — capital cost, energy cost, reliability and number of vehicles served.

DC fast chargers

DC chargers convert AC to DC inside the unit and feed the battery directly, bypassing the vehicle's on-board charger. That is what enables high power — and it is also why DC units are larger, more expensive, thermally demanding and more failure-prone than AC.

Power bands from around 30 kW through 60 kW, 120 kW and beyond, with higher-power units suited to highway corridors and heavy commercial vehicles.
CCS2 as the prevailing connector for cars in most markets, with additional standards specified only where the local vehicle mix requires them.
Vehicle acceptance rate as the practical limit — a car that accepts 50 kW will not charge faster on a 150 kW unit, so charger power should be matched to the fleet it serves.
Thermal management and derating behaviour, which determine whether the unit sustains rated power on a hot afternoon or throttles back.
Cable weight and reach, a genuine usability factor at high power where liquid-cooled cables may be justified.

Smart charging and protocol support

A charger is a networked asset for its entire service life. Protocol support determines whether you can manage it, bill through it, and change management platforms later without replacing hardware.

OCPP for communication between the charger and the central management system — the single most important specification for avoiding vendor lock-in.
Smart charging and load management capability, so the charger can accept a reduced power setpoint from the site controller.
Metering accuracy adequate for billing, including certified metering where energy is sold to the public.
Remote diagnostics, firmware update capability and error reporting, which together determine how much of a fault can be resolved without a site visit.
Roaming protocol support where the site is to be visible on third-party charging networks and apps.

Specifying for the physical environment

Chargers fail in the field for unglamorous reasons: water ingress, dust, heat, connector wear and cable damage. Environmental specification is not a footnote.

Ingress protection rating appropriate to outdoor installation, including protection against jetting water where the site is washed down.
Operating temperature range and cooling method, checked against the site's actual summer ambient rather than a European default.
Impact protection rating and physical robustness for unattended public locations.
Corrosion resistance where the site is coastal or exposed to industrial atmospheres.
Cable management — holsters, retractors and strain relief — since a cable left on the ground is the most common cause of premature connector failure.

Supply, installation and support

We supply chargers as standalone equipment or as part of a complete site build. Either way the specification discipline is the same, and the warranty and spares position is agreed in writing before purchase rather than discovered during a fault.

For clients running multiple sites, we keep the hardware consistent wherever practical. A standardised estate is dramatically cheaper to maintain, stock spares for, and train staff on than one assembled from whatever was cheapest at each purchase.

Frequently asked questions

What is the difference between an AC EV charger and a DC fast charger?

An AC charger supplies alternating current and relies on the vehicle's on-board charger to convert it, so the vehicle limits the speed. A DC charger does the conversion inside the unit and feeds the battery directly, allowing much higher power. AC is cheaper, smaller and more reliable; DC is faster and considerably more expensive to buy, install and maintain.

Will a higher-powered charger always charge my vehicle faster?

No. Charging speed is limited by whichever is lower — the charger's output or the vehicle's maximum acceptance rate — and it also tapers as the battery fills. A vehicle that accepts 50 kW gains nothing from a 150 kW unit. Specifying charger power to the fleet actually using the site avoids paying for capacity that never gets used.

Why does OCPP support matter when buying EV chargers?

OCPP is the open protocol between chargers and management software. Buying OCPP-compliant hardware means you can change management platforms, add sites from a different vendor, or renegotiate a software contract without replacing the chargers. Proprietary-only hardware ties the whole estate to one supplier's commercial terms for a decade.

Which connector standard should I install?

For cars in most markets, CCS2 for DC and Type 2 for AC covers the overwhelming majority of the vehicle parc. Additional standards should be specified only where the local vehicle mix genuinely requires them — for example a specific standard used by two- and three-wheelers or by an existing captive fleet.

How reliable are EV chargers in practice?

AC units are simple and generally very reliable. DC units contain power conversion electronics and cooling systems and see proportionally more faults, most of them heat- or connector-related. The practical levers are specifying adequate thermal headroom for the local climate, good cable management, and remote diagnostics that let faults be triaged without a site visit.

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Need chargers specified for your site?

Tell us the vehicle types, dwell times and site conditions. We will recommend a power band and connector mix — and explain what we ruled out.

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