Working with the utility on a DC charger grid connection is a sequence, not a single application: you bring a clear picture of the load you want to add, the utility assesses its network against it, issues the connection terms in writing, the connection works are carried out, and the supply is energised and recorded. Treat every answer that affects your budget or programme as valid only when the utility has put it in writing.
Key Takeaways
- A DC grid connection runs in stages — load picture, enquiry, utility assessment, written offer, works, energisation — each with a named owner.
- Bring the whole load picture, including future units; the utility sizes against the total, not against the first charger alone.
- Timelines, assessment fees, reinforcement and cost-sharing are the utility’s answers — valid only in writing.
- Fix foundations and cable routes after the written connection offer, not before it.
The Conversation, in Order
| Stage | Who leads | What changes hands |
|---|---|---|
| Load picture | Site owner, with the site electrician | Existing site load, the new charger’s draw, and any future units — set out before anyone is approached |
| Capacity enquiry | Owner or installer to the utility | The enquiry goes in; the utility’s first view of available capacity comes back |
| Utility assessment | The utility | Their study of the local network against your load picture |
| Connection offer | The utility | The connection design, terms and any conditions — in writing |
| Connection works and energisation | Utility and its approved contractors, with your installer | The completed connection, metering as arranged, and the commissioning records |
The Load Picture You Bring
A compact DC unit makes this conversation simpler than a corridor charger does, but the arithmetic still has to be honest. As labelled planning arithmetic: one EV-RHDC30K-L draws in the 22 kW class at full output, so one unit asks the network for roughly that much, a second unit doubles the ask, and the site’s existing peak load sits underneath both. Bring the future picture too — a second unit planned for next year belongs in the first enquiry, because an assessment for one charger does not cover two. Your electrician owns these numbers; the utility sizes its side against them.
What Only the Utility Can Tell You
Four answers decide most DC connection projects, and none of them can be sourced from a charger listing, a guide, or another site’s experience:
- How long the process takes — application, assessment and works each run on the utility’s own timetable.
- What the assessment costs — whether a study or application fee applies, and how much, is the utility’s figure.
- Whether the network needs reinforcement — and, if it does, how the cost of that work is shared. The rule is the utility’s, stated in the offer.
- What the connection point and metering will look like — their design, issued as part of the offer.
Ask for all four in writing at the enquiry stage. A verbal “that should be fine” is not a connection. Our explainer on how DC fast chargers work covers why a DC unit needs a serious supply in the first place; the cost structure of the bigger class is in why DC fast charging is expensive.
Where the EV-RHDC30K-L Fits
The unit is specified at 22 kW on its product page, with OCPP 1.6J for the operator’s platform and an IP54 enclosure for outdoor sites. That size is the point of the utility conversation above: the ask is one compact unit’s draw, an order of magnitude below the corridor class described in Level 1 vs Level 2 vs DC fast charging. Sequence the project so the written connection offer exists before foundations and cable routes are fixed, and keep the offer, the connection design and the energisation records with the station’s commissioning file.
Frequently Asked Questions
How long does a utility connection take?
There is no portable figure — it is the utility’s own timetable for your network area and your load. Ask at the enquiry stage, get the answer in writing, and build your programme around it, not around an assumption.
Can I install the charger before the connection is ready?
You can prepare the site, but the charger earns nothing until the supply exists, and positions fixed before the connection design arrives can be wrong. The safe order is enquiry, written offer, then groundworks sized to the offer.
What if the utility says capacity is limited?
That answer starts a design conversation, not an argument: fewer units, a staged connection, or supply works are the utility’s options to price in the offer. Bring the options back to your electrician and compare them as written offers, not estimates.
Related Reading
- How Do DC Fast Chargers Work?
- Why Is DC Fast Charging So Expensive?
- Level 1 vs Level 2 vs DC Fast Charging: A Practical Comparison
- How Fast Is a DC Fast Charger?
