Battery storage at a charging site pays in two situations, and both are read off your own records: your tariff bills a demand charge that your charging peaks actually drive, or your grid connection cannot grow on your timeline and a battery buys headroom while it cannot. Outside those two, the honest answer is usually not yet. There is no general payback figure — the case is an arithmetic exercise on your bill, your load profile and a storage supplier’s quote.
Key Takeaways
- Storage pays against a demand charge your peaks actually drive, or as a buffer where the connection cannot grow — read from your own records.
- Costs come from the storage supplier’s quote; savings only from lines your tariff actually contains.
- Size against the measured load profile from your platform’s session records, not a sketch.
- EVDANCE supplies chargers only; storage is a separate system with its own supplier and warranty.
The Pays-When Test
| Condition | The site’s own evidence | The input that decides it |
|---|---|---|
| Your peaks set a demand charge | Your tariff sheet bills demand, and your interval records show charging peaks landing inside the billed peak window | The storage quote, set against the demand line it can realistically shave on your profile |
| The connection is capped | The utility’s written offer limits new load, or dates an upgrade beyond your programme | The buffer case: storage quote versus the upgrade offer and the cost of waiting |
| On-site generation is being spilled | Your PV records show surplus exported at low value while chargers draw from the grid at other hours | The export terms in your connection agreement, priced against the same energy used on site |
| A contract demands continuity | A host or fleet agreement names an availability duty the site must hold through outages | The specified requirement itself — the duty is the input, not a savings line |
Notice what is missing from the table: the energy price alone. The U.S. average commercial electricity price of 14.53 cents per kWh is an energy figure; storage does not make energy cheaper per unit in any sourced account, and a case built on buying low and selling high needs your tariff’s actual time-varying rates — from your bill, not an average. The wider question of whether a site earns is treated in our piece on whether an EV charging station business is profitable.
Running the Arithmetic Without Inventing It
- Costs come from documents. The storage system’s quoted price, its installation, and its own upkeep and warranty terms — all from the storage supplier’s papers, never estimated in a planning meeting.
- Savings come only from lines your tariff has. If your bill has no demand charge, peak shaving saves nothing on that line. If your export is already paid at a fair rate, stored solar gains little. Count only lines that exist.
- The load profile is measured, not sketched. Session records from your charging platform show when peaks actually occur and how long they last — the battery is sized against those hours.
- The comparison is against the alternative. For a capped connection, the rival case is the utility’s upgrade offer. Storage wins, loses or defers — and “defers” is a legitimate result.
What Storage Does Not Fix
Storage is not a charger feature and does not repair a weak site. It does not add ports, shorten a queue caused by too few chargers, or raise utilisation that marketing has not delivered. It also does not change what the chargers are: EVDANCE supplies chargers only — no battery products — so a storage line in a site plan is a separate supplier’s system, with its own specification and warranty. On the charging side, the EV-AC03201T dual-connector AC station and the EV-RHDC30K-L compact DC charger report sessions over OCPP 1.6J to the operator’s platform — the records that measure the profile a storage case is built on. Site planners can discuss the charging lines via our commercial charging team or contact us.
Frequently Asked Questions
How long does site storage take to pay back?
No sourced period exists, and any article quoting one for your site is inventing it. Payback is the output of your tariff, your measured profile and a real storage quote — run the division with those three documents and no others.
Can a battery replace a transformer upgrade?
Sometimes it defers one, by buffering peaks inside a capped connection. Whether it replaces one is decided by the utility’s written offer and your load records together — a project decision, not a rule.
Does EVDANCE sell storage batteries?
No. EVDANCE manufactures EV chargers. Storage is sourced from its own suppliers, specified and warranted separately — the same separation that applies when chargers are bundled with solar equipment.
Related Reading
- Is an EV Charging Station Business Profitable?
- How Do Commercial EV Charging Stations Work?
- How Much Do Commercial EV Chargers Cost?
- Fleet Depot Charging: How to Size AC Chargers for Vans and Light Commercial Vehicles
