Storage System POC Energy Calculator
Upload the Excel database, fill in parameters, then calculate FAT, SAT, and Year 1-25 energy & efficiency.
How to use (click to view)
Product Overview
- BESS POC Calculator is a lifecycle energy simulator for utility-scale BESS, solving POC usable energy and RTE estimation from FAT through Year 25.
- Key features:
- SOH-based degradation (calendar + cycle aging)
- Full-chain losses (DC cable → PCS → PCS-T1 cable → T1 → MV cable → T2 → HV cable)
- MV/HV boundary switch
- FAT→SAT storage loss
- Temperature-driven aux correction
Configuration (3 sections)
- Project Basics:
- Rated Capacity (per container)
- Battery Qty
- Cell Brand
- Prate (e.g., 0.5P/0.25P)
- Cycle/day
- DOD (90–100%)
- Environment & Logistics:
- FAT→SAT months (storage loss; 0 ignores loss)
- Shipping Temp (affects storage loss)
- Operating Temp (affects aux power)
- System & Efficiency:
- PoC = MV (exclude T2/HV cable) or HV (include T2/HV cable)
- Efficiencies: η_DC_cable, η_PCS, η_PCS-T1_cable, η_T1, η_MV_cable, η_T2 (HV), η_HV_cable (HV)
Core Formulas (per year)
$$
\begin{aligned}
\text{Duration} &= \frac{1}{P_{\text{rate}}}\;\text{(h)} \\[6pt]
E_{\text{aux}} &= N_{\text{bat}} \times \text{Duration} \times P_{\text{aux}} \\[8pt]
E^{\text{dis}}_{\text{DC}} &= \text{SOH} \times N_{\text{bat}} \times E_{\text{rated}} \times \text{DOD} \times r_{\text{DC}} \times \eta_{\text{storage}} \\
E^{\text{chg}}_{\text{DC}} &= \frac{E^{\text{dis}}_{\text{DC}}}{\eta_{\text{DC RTE}}} \\[8pt]
\eta_{\text{sys}} &= \eta_{\text{DC cable}} \times \eta_{\text{PCS}} \times \eta_{\text{PCS-T1 cable}} \times \eta_{\text{T1}} \times \eta_{\text{MV cable}} \times (\eta_{\text{T2}} \times \eta_{\text{HV cable}}\;\text{if HV}) \\
E^{\text{dis}}_{\text{POC}} &= E^{\text{dis}}_{\text{DC}} \times \eta_{\text{sys}} \\
E^{\text{chg}}_{\text{POC}} &= \frac{E^{\text{chg}}_{\text{DC}}}{\eta_{\text{sys}}} \\
\text{AC RTE} &= \frac{E^{\text{dis}}_{\text{POC}}}{E^{\text{chg}}_{\text{POC}}} \\[8pt]
E^{\text{dis,aux}}_{\text{POC}} &= E^{\text{dis}}_{\text{POC}} - E_{\text{aux}} \\
E^{\text{chg,aux}}_{\text{POC}} &= E^{\text{chg}}_{\text{POC}} + E_{\text{aux}} \\
\text{AC RTE}_{\text{aux}} &= \frac{E^{\text{dis,aux}}_{\text{POC}}}{E^{\text{chg,aux}}_{\text{POC}}}
\end{aligned}
$$
Symbols
- \(P_{\text{rate}}\): system power rating (P)
- \(N_{\text{bat}}\): number of containers
- \(P_{\text{aux}}\): aux power per container (kW)
- \(E_{\text{rated}}\): rated energy per container (MWh)
- \(\text{SOH}\): state of health (fraction)
- \(\text{DOD}\): depth of discharge (fraction)
- \(r_{\text{DC}}\): DC ratio
- \(\eta_{\text{storage}}\): 1 − storage loss (FAT→SAT)
- \(\eta_{\text{DC RTE}}\): DC round-trip efficiency
- \(\eta_{*}\): efficiencies of each link; include \(\eta_{\text{T2}}\) and \(\eta_{\text{HV cable}}\) only when PoC = HV
Steps
- Fill parameters in the three sections; set PoC boundary correctly.
- Click Calculate → view table & charts → download CSV/PNG.