A-Charge | Solar + storage: a charging hub that never stops

Three revenue pillars: charging, self-consumption, grid sales

Charging revenue only appears when cars show up. Add solar and storage, and you have three pillars—when one is thin, the other two carry the site.

Charging revenue. A-Charge time-based fees. Grows with foot traffic.
Self-consumption savings. Use your own solar power for chargers and the facility; buy less from the utility. The higher electricity prices go, the more this pillar pays.
Surplus sales. Sell what you can't use to the grid. Even on days with no cars, sunshine still earns.

Revenue mix comparison: busy urban site vs. seasonal parking lot

The mix is designed per site. Busy urban locations lean on self-consumption and charging revenue; parking lots with an off-season lean on grid sales.

How it works: solar, storage, and chargers as one system

At the center are solar panels, batteries, and a proven hybrid inverter such as Victron Energy hardware. It manages generation, charge/discharge, and grid exchange, while A-Charge handles billing and power sharing on the charger side.

System diagram: solar, battery, hybrid inverter, EV chargers, facility, grid

Daytime: solar feeds chargers and the facility directly; buy only the shortfall.
Surplus goes to the battery first, then to the grid as sales.
Nights and rainy days: the battery discharges to shave purchased-power peaks.
Combined with A-Charge load balancing, maximize charging bays within your grid capacity.

A normal day

Across one day, each pillar works a different shift.

Daily profile: generation, self-use, storage, sales, discharge

Morning. As generation ramps up, solar starts covering the facility and chargers.
Midday. Peak generation. Power charging and self-use; surplus fills the battery, then sells to the grid.
Evening & night. Generation ends, but the battery discharges to serve evening charging demand.

In a disaster: come here, there is power

When the grid fails, the hybrid inverter disconnects from the utility and keeps a local micro-grid (island mode) running on solar and batteries. On the day the town goes dark, this parking lot stays on.

Island mode diagram: grid out, local micro-grid keeps serving chargers, outlets, lights

EV charging continues—keeping mobility and "batteries on wheels" alive.
Open up phone charging, power outlets, and lighting to the neighborhood.
When the sun rises, solar recharges the system. No fuel deliveries needed.
Revenue asset on normal days, community hub in emergencies—one system, two roles.

Where it fits

Urban, high-traffic sites

Malls, offices, hospitals—places where people and cars gather by day get the most from self-consumption and charging revenue. And the more people nearby, the more a "place with power" matters in a disaster.

Parking lots with an off-season

Tourist-area and seasonal lots used to earn nothing in the quiet months. Weight the design toward grid sales and the sun keeps earning even in the off-season—with charging revenue stacking on top in peak season.

Why I-S3 can design it as one

I-S3 Co., Ltd. builds and operates high-voltage and self-consumption solar plants, develops its own monitoring and control systems, and has delivered hundreds of EV charger installations centered on AC charging. Instead of hiring separate vendors for generation, storage, charging, and billing, you get one integrated design.

Feasibility and tariffs for grid sales (FIT/non-FIT), interconnection, grid capacity, battery sizing, and the scope of emergency power all depend on site conditions and equipment. Every hub is designed and quoted individually. The solar and battery integration described here is at the concept stage and is not a current A-Charge feature.

Talk about your resilience hub

Owner overview See the rollout steps

A charging hub that never stops.