Aéroclub Arc, Chavenay: 13.5 kWp PV + 35 kWh BESS + 22 kW EV charger

Aéroclub Arc, in Chavenay (Yvelines, France), opted for an energy solution combining solar production, stationary storage and EV charging. Three connected devices help the club cut its electricity bill, gain autonomy, and offer a new service to members while they are on site.

Context: a Paris-area aeroclub that wants to control its energy bill

The club's president wanted a project that solves several needs at once: producing electricity on site, storing it to use at the right time, and letting members charge their vehicle while they fly.

Rather than selling production back to the grid, the customer chose a 100% self-consumption model: every kWh produced by the panels offsets a kWh purchased, and surplus is stored for release when consumption exceeds solar output.

What was installed at Aéroclub Arc?

Three distinct devices that complement each other — each delivered by a specialised partner.

A 13.5 kWp ground-mounted solar array

The ground-mounted PV array has a peak power of 13.5 kWp. Its role: produce the solar electricity that powers the site during the day and charges the battery whenever there is surplus. Installation was carried out by ATY Solar.

A Battwoo 35 kWh / 23 kW storage cabinet

The Battwoo stationary storage cabinet has a 35 kWh capacity and 23 kW useful power. It plays a key role: storing surplus solar electricity produced during the day so it can be released when consumption exceeds solar output — typically during EV charging sessions.

A 22 kW EV charger

The WattPark EV charger, rated at 22 kW, is installed close to the club. It is intended for members who can charge their vehicle while at the club.

How does the system work in practice? Example: a Tesla Model 3 charging session

Concretely, the PV + battery + charger combination delivers a very high share of self-consumed energy on each session.

Sample case: a Tesla Model 3 arrives at the club with a 75 kWh battery at 20% charge. If the Battwoo unit is at 100% state of charge and solar production is maximised:

• 98% of the charge is delivered by the local installation (PV + stored energy).
• Only 2% comes from the public grid.

Without the system (full grid charge at the average rate of €0.19/kWh), the same session would cost around €11. With the system, those €11 become a saving for the aeroclub.

Benefits for Aéroclub Arc

Benefits for Aéroclub Arc are multiple and illustrate why combining solar, storage and EV charging makes sense:

• Direct savings on the electricity bill: most consumed energy is now produced and used locally.
• No surplus lost: by storing solar surplus in the Battwoo unit, energy is no longer fed back to the grid at low rates — it is mobilised at the right moment.
• A new value-added service: the EV charger lets the president offer free charging to members without raising the club's grid consumption, thanks to the battery.

To assess a similar configuration at your site, request a personalised Battwoo study.

Frequently asked questions

What is the total installed power?

Production side: 13.5 kWp ground-mounted PV. Storage side: 35 kWh / 23 kW Battwoo cabinet. Charging side: 22 kW EV charging station.

How is the EV charger powered?

Primarily by solar production during the day, complemented by the Battwoo battery when consumption exceeds production. The grid only steps in as a top-up (about 2% on the Tesla Model 3 20 → 100% case).

What is the battery's exact role in the system?

It stores surplus solar electricity produced during the day to release it when consumption exceeds solar production — typically during an evening EV charging session or in overcast weather.