Battery Energy Storage for Quarry & Mining

The Physics of a Quarry's Power Problem

A jaw crusher starting under load can draw 250% of its rated current for 5-10 seconds. A conveyor belt with a full load does the same. Your diesel genset sees a sudden impedance drop, the voltage sags, frequency dips, and if the load is big enough, the genset stalls or trips.

That shock load is not just a nuisance. It forces you to oversize the genset by 30-50% just to survive transients, and it burns extra fuel. The genset runs at partial load most of the time, which causes wet stacking, carbon buildup, and shorter overhaul intervals.

Normal Working Day: Shock-Load Smoothing

Imagine a 1500 kW crusher line fed by a 2000 kVA diesel genset. Every time the crusher bites into a new rock, the genset lugs. With a 1000 kW / 700 kWh BESS in parallel, the battery supplies the instantaneous spike, and the genset only sees the average load. The battery recharges during the lulls.

The BESS acts as a low-impedance source. It responds in milliseconds, so voltage sag is cut from 15% to under 5%. Your crusher runs faster, with fewer stalls. Diesel consumption drops 10-15% because the genset no longer hunts.

We have measured payback from fuel savings alone at 3-5 years for sites running 12-hour shifts.

Emergency Outage: Black Start and Ride-Through

When a genset trips, the entire site goes dark. A BESS with black-start capability can pick up critical loads — lighting, control systems, a small conveyor — within 20 milliseconds. That keeps the site safe and prevents ore loss in flotation cells or crusher jams.

The BESS can also support a genset during a fault ride-through. If a downstream short circuit occurs, the genset may see a voltage collapse; the BESS injects reactive power (if specified with a 4-quadrant inverter) and holds the bus up until the fault clears.

For a typical 1000 kW site, a 500 kWh BESS can power essential loads for 30-60 minutes — enough time to start the backup genset or shut down safely.

Seasonal Peak: Demand Charge and Fuel Arbitrage

Peak season in a quarry is summer when construction demand peaks. Your diesel bills spike because you run longer hours. If you are grid-connected, the utility demand charge can be brutal — for a 1500 kW site, a 500 kW demand spike can cost UAH 50,000 per month in penalties.

A BESS can shave those peaks. Charge at night (off-peak grid or when genset is lightly loaded), discharge during the peak. For grid-connected quarries, this cuts demand charges by 20-30%.

For off-grid sites, the BESS allows you to run a smaller genset at higher load, or even switch it off during low-load periods, relying on the battery alone.

Sizing and Engineering: What You Need to Provide

Power sizing: take the largest single motor's starting current (from the datasheet) and add the running load of the rest of the site. That is the peak power the BESS must deliver for 1-2 seconds. For a 500 kW crusher, starting current is typically 6x FLA, so 3000 kW for 5 seconds. A BESS rated at 1000 kW continuous can handle that because of its inverter's short-term overload capability.

Capacity sizing: decide how long the shock lasts and how often. A typical rule of thumb: 2-3 times the average power for 1-2 hours. For a 1000 kW site, that means 2000-3000 kWh. But that is a rough starting point; we always run a 24/7 load profile analysis.

If sized wrong: underpowered BESS will saturate and the genset still sees the spike. Undersized capacity means the battery is empty by mid-shift and you get no benefit. Oversizing wastes capex.

Engineer's input: at least one month of load data at 1-minute resolution, your electricity bills (if grid), a single-line diagram showing motor sizes and starting methods, and your genset specs (kW, kVA, governor type). Without that, our sizing is a guess.