Battery storage for limited grid capacity and business charging
A battery can supply additional local power for short periods while grid demand stays within the agreed limit. This can support charging, machine starts and other peaks. It needs sufficient stored energy and time to recharge between loads.
Identify the actual constraint
Is the bottleneck the connection, transformer, an internal circuit or simultaneous equipment use? Measure the load profile before selecting a solution. A battery does not automatically increase your connection entitlement or fix every electrical limitation.
Example: an extra 100 kW for half an hour
Assume charging and building loads require 300 kW for half an hour, while the grid can provide 200 kW. The battery must contribute at least 100 kW and deliver 50 kWh to the load. This is a simplified sizing example, not a product recommendation.
| Quantity | Calculation |
|---|---|
| Battery power | 300 kW − 200 kW = 100 kW |
| Delivered energy | 100 kW × 0.5 hours = 50 kWh |
| Ideal recharge time with 25 kW spare capacity | 50 kWh ÷ 25 kW = 2 hours |
- Real charging takes more energy and time because of losses.
- Usable capacity must account for reserves, aging and allowed charge levels.
- Other building loads and starting currents must be included.
Can it recharge before the next peak?
The battery needs to be ready for the next vehicle or production run. Looking only at the largest peak can produce the wrong size. Assess the complete operating day and the busiest periods.
If demand exceeds grid capacity throughout the day, the battery can empty with no opportunity to recharge. Consider reducing or shifting loads, local generation, alternative supply or a stronger connection.
Coordinate charging, production and backup
The EMS must plan charging and discharge within an explicit grid-demand limit. Vehicle requirements and critical operations may take priority over price optimization. Backup reserves reduce the energy available for daily use.
Reserve-market offers must also respect those commitments. Capacity needed for the next vehicle departure cannot simultaneously be counted as freely available for other purposes.
What should your business establish before ordering?
Request analysis of a representative operating day and the most demanding periods. Enfy assesses battery, control and installation together with the building’s use.
- Agreed import and export limits with the grid company.
- Meter data, operating schedules and charging needs by vehicle or process.
- Concurrent loads, starting currents and internal electrical capacity.
- Location, environmental conditions, safety and maintenance access.
- Priorities during communication failure, low charge or grid outages.
- Documented functional tests and responsibility for ongoing follow-up.
Questions and answers
Can a battery increase charging power without a larger grid connection?
It can provide part of the power locally when sufficiently charged. The system needs enough power and duration, with adequate recharge windows.
Is this the same as peak shaving?
The functions are related. Peak shaving reduces grid-demand peaks; this use case focuses on enabling planned operation within a power limit. One system may contribute to both.
Can the energy calculator size our charging installation?
It provides an economic scenario using simplified annual values. It does not simulate vehicle sessions or battery charge throughout the day. Sizing requires a separate analysis.
Sources and further reading
Planning a system for a specific building or site? Bring consumption data and explain what you want to achieve so we can assess the next steps together.
Discuss your project with Enfy