Why Commercial Solar + Storage Delivers More Value

Solar-only systems generate electricity when the sun shines, which may not align with when your facility consumes power or when your utility charges peak rates. Battery Energy Storage Systems (BESS) bridge that gap, storing excess solar production and discharging it strategically to maximize bill reduction, eliminate demand charges, and provide backup power when the grid goes down.

For commercial facilities facing Time-of-Use (TOU) rate structures, demand ratchet clauses, or critical power requirements, the combination of solar and storage is often the superior financial choice versus solar alone. The federal ITC applies to BESS systems when charged primarily by solar, making the financing structure favorable under our ESP model.

Three Ways Solar + Storage Saves Money

  • Demand Charge Elimination: Demand charges can represent 20-50% of a commercial electricity bill. BESS systems discharge during peak demand windows, capping the 15-minute demand reading that determines monthly charges. For facilities paying $15-30/kW/month in demand charges, the savings can be dramatic.
  • Time-of-Use Optimization: Many commercial utilities have TOU rate structures with peak periods at 2-8x the off-peak rate. BESS stores cheap off-peak energy (or excess solar) and deploys it during expensive peak periods, arbitraging the rate differential.
  • Backup Power and Resiliency: Commercial BESS systems can maintain critical operations, lighting, refrigeration, or computing loads for 4-10 hours during grid outages. For facilities in storm-prone markets or with critical operational requirements, backup power provides real economic and operational value.

Commercial BESS Technology

Our EPC partners deploy lithium iron phosphate (LFP) battery systems from manufacturers including Tesla Megapack, Fluence, and Powin for larger installations, and SolarEdge, Enphase, and SMA for systems under 500 kWh. LFP chemistry offers superior cycle life, thermal stability, and safety compared to earlier lithium-ion formulations, making it the commercial standard for C&I applications.

System sizing is determined by your peak demand profile, TOU rate structure, and backup power requirements. Most commercial C&I installations range from 100 kWh to 2 MWh, with larger utility-scale systems available for data centers, campuses, and industrial facilities.

Frequently Asked Questions

Does battery storage qualify for the federal ITC?
Yes. Under the Inflation Reduction Act, standalone battery storage systems (Section 48E) qualify for the 30% federal ITC regardless of whether they are charged by solar or the grid, as of January 1, 2023. When paired with solar, the combined system qualifies for the ITC with potential energy community and domestic content adders. This significantly improves the financial case for solar-plus-storage systems compared to pre-IRA economics.
How do we know if battery storage is right for our facility?
Demand charges are the primary economic driver. If your utility charges demand fees (visible on your bill as a $/kW charge), and your peak demand spikes are brief and predictable, battery storage likely delivers strong ROI. Facilities with TOU rate structures, critical power requirements, or locations with frequent outages are also strong candidates. Our team analyzes 12 months of interval meter data to model the exact demand charge reduction achievable with a correctly sized system.
What is the lifespan of a commercial battery storage system?
Modern LFP commercial battery systems are warranted for 10-15 years with guaranteed capacity retention (typically 70-80% of original capacity at end of warranty). Most systems exceed their warranted cycle life in real-world commercial applications. After the warranty period, battery modules can be replaced or augmented rather than replacing the entire system, extending operational life significantly.
Can we add storage to an existing solar system?
Yes, in most cases. AC-coupled BESS systems can be added to existing solar installations by connecting the battery inverter to your existing electrical panel, independently of the solar inverter. The retrofit requires an updated interconnection application with your utility and may need a new permit. Our EPC partners assess existing systems for storage retrofit compatibility as part of the proposal process.