ROSEC Solar designs DC-Coupled PV-plus-battery systems with optimized values of Inverter Loading Ratio (ILR) and Battery-Inverter Ratio (BIR). ILR is also called the DC/AC Ratio.

ILR = DC/AC Ratio = (MW Capacity of the PV Array) / (MW Rating of the Inverter)

ILR or DC/AC ratio optimization ensures highest PV production.

High ILR is an indicator of effective utilization of the PV inverters and high ROI.

Battery-Inverter Ratio = BIR = (MW Rating of battery PCS) / (MW Rating of the Inverter)

Perfect matching between ILR and BIR minimizes the power-limited clipping and determines the division of the Array-generated energy that is to be sent directly to the grid and how much is to be shifted to peak hours by charging the BESS.

Similarly, a tight coordination is necessary between ILR, BIR, Battery Capacity, PCS size and grid curtailment to minimize the energy-limited clipping.

DC-Coupled Topology ensures excess energy harvesting – Clipping Recapture, Curtailment & Outage Recapture, Low Voltage Harvesting, and Recoverable energy during controlled ramp up. Capturing excess energy increases plant capacity factor.

ROSEC Solar provides consultancy for Solar-plus-Storage configurations for all possible Use Cases, Operating Strategies, Value Propositions, Financial Valuation, and interconnection requirements.