How does the Commercial Microgrid & BESS Battery Arbitrage Sizer calculate financial return and payback?

The solver models gross capital expenditure (CapEx), Section 48 Investment Tax Credits (ITC 30%–50%), 5-year MACRS accelerated depreciation, utility demand charge shaving, and levelized cost of energy (LCOE).

Does this calculator account for battery degradation over time?

Yes, it models standardized degradation curves (typically 1.5% to 2.2% annually for LiFePO4 cells) and accounts for battery pack augmentation cycles across a 20-to-25 year lifecycle.

What federal tax credits apply under the Inflation Reduction Act?

Under Section 48 and Section 45Y, qualifying clean energy and battery storage installations unlock a 30% base ITC, plus potential 10% domestic content and 10% energy community bonus adders.

Hub / Commercial Clean Tech & MEP / Microgrid & BESS Arbitrage Sizer

Commercial BESS & Microgrid Arbitrage Sizer

Model behind-the-meter (BTM) battery energy storage systems (BESS). Downsize utility electric demand charges, monetize Time-of-Use (TOU) energy arbitrage, avoid regional 4CP transmission capacity tariffs, and model IRA §48 30%–40% Clean Energy ITC cash incentives.

ASHRAE 90.1 / IEEE 2030.2

1. Facility Peak Load Profile

Peak Facility Demand (kW): 850 kW

100 kW2,500 kW5,000 kW

Off-Peak / Baseload (kW): 320 kW

Daily On-Peak Window (Hours): 4 Hours

Typically 2:00 PM – 6:00 PM or 4:00 PM – 9:00 PM summer peak

2. BESS Sizing & Chemistry

Battery Chemistry:

Target Duration (C-Rate):

BESS Inverter Power Rating (kW): 400 kW

Rated continuous discharge output to facility main distribution panel

Calculated Nameplate Storage: 1,600 kWh

Usable (85% DoD): 1,360 kWh

3. Electric Tariffs & Federal Credits

Demand Charge ($/kW/mo): Commercial utility tariff

TOU Spread ($/kWh): Peak minus off-peak rate

Installed Cost ($/kWh): Turnkey BESS + Inverter + BoS

IRA §48 ITC Credit (%):

Include Regional 4CP / Capacity Peak Avoidance ($48/kW/yr)

24-Hour Facility Dispatch & Peak Shaving Profile

Simulation of facility load, BESS charging (off-peak), and peak discharge clipping

Base Load Unmitigated Peak Shaved Net Load

Grid Demand Shaved -340 kW (-40.0%)

Net Billed Peak 510 kW

Round-Trip Efficiency 88.0%

Annual Value Stacking Revenue Breakdown $124,560 / yr

1. Monthly Demand Charge Shaving ($24.50/kW): $99,960 / yr

2. TOU Price Arbitrage (260 cycles/yr @ $0.14/kWh): $19,802 / yr

3. Regional 4CP / Capacity Peak Avoidance: $16,320 / yr

Pro-Forma ROI & Federal Clean Energy Subsidies

Gross CapEx $768,000 Turnkey Installed

IRA §48 ITC (30%) -$230,400 Direct Cash Credit

Net Out-Of-Pocket $537,600 After ITC Baseline

Simple Payback 3.9 Yrs 23.8% Unlevered IRR

15-Year Cumulative Net Savings: $1,482,000

Includes 2.5% annual utility escalation & degradation

Engineering Sizing Basis & Standards

Peak Demand Shaving Mechanics Commercial billing ratchets lock 15-minute or 30-minute monthly coincident peak demands. By dispatching stored BESS energy whenever facility loads exceed the optimal threshold, the peak demand billed by the electric utility is capped, slashing the monthly $/kW demand fee.

Chemistries: LFP vs Flow vs Sodium Lithium Iron Phosphate (LFP) delivers high round-trip efficiency (88%–92%) and thermal stability for 2-hr to 4-hr durations. Vanadium Redox Flow Batteries (VRFB) provide non-degrading 6+ hour long duration discharge. Sodium-ion is an emerging zero-cobalt/nickel cost alternative.

IRA Section 48 & Interconnection The Inflation Reduction Act (IRA) provides standalone energy storage systems (≥5 kWh) an immediate 30% Investment Tax Credit (ITC), plus 10% domestic content and 10% energy community bonus adders. Grid interconnection complies with IEEE 1547 and UL 9540A fire safety protocols.