PV yield
262,800 kWh/yr
PV + Storage + EV Charging Configurator
Configure an integrated photovoltaic + battery storage + EV charging system — capacity matching, operating strategy and full-cost economics in one tool.
For developers and EPCs designing integrated PV + storage + EV charging systems (self-consumption, peak shaving or off-grid).
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Worked example
A pre-computed reference example (crawlable — no JavaScript required). Enter your own parameters above for a live result.
Worked example — 200 kW PV + 400 kWh storage + 120 kW EV, grid-tied
System configuration
200 kW PV · 400 kWh · 120 kW EV
on-grid · autonomy 3.3 h · self-consumption 85%
Charging demand
262,800 kWh/yr
CAPEX
POA
Payback
3 yr
Capacity matching
| Quantity | Value |
|---|---|
| PV capacity | 200 kW |
| Charging load | 120 kW |
| PV : load ratio | 1.67 (PV ≥ load — self-sufficient by day) |
| Storage autonomy | 400 kWh ÷ 120 kW = 3.3 h |
| PV annual yield | 200 × 4.5 × 365 × 0.8 = 262,800 kWh/yr |
| Charging annual energy | 120 kW × 6 h × 365 = 262,800 kWh/yr |
Operation strategy
Grid-tied peak shaving + self-consumption
Charge the battery from PV (or valley tariff) and discharge during the peak period; self-consume 85% of PV on site, export the remainder.
Full-cost economics (25 yr, discounted @ 8%)
| Component | Value |
|---|---|
| Initial CAPEX | POA |
| Annual O&M (1%/yr) | POA/yr |
| Battery replacement (yr 10) | POA |
| Inverter replacement (yr 15) | POA |
| Net present value (NPV) | POA |
| Simple payback | 3 years |
Bill of materials
| Equipment | Spec | Qty | Subtotal |
|---|---|---|---|
| PV modules | 200 kWp · 4.5 kWh/m²/day site | 1 | POA |
| PV inverter | 200 kW | 1 | POA |
| Battery energy storage (LFP) | 400 kWh | 1 | POA |
| PCS (power conversion system) | 125 kW | 1 | POA |
| DC fast charger (120 kW) | 120 kW | 1 | POA |
| Total CAPEX | POA |
Worked example — 100 kW PV + 200 kWh storage + 60 kW EV, off-grid
System configuration
100 kW PV · 200 kWh · 60 kW EV
off-grid · autonomy 3.3 h · self-consumption 95%
PV yield
116,800 kWh/yr
Charging demand
131,400 kWh/yr
CAPEX
POA
Payback
3 yr
Capacity matching
| Quantity | Value |
|---|---|
| PV capacity | 100 kW |
| Charging load | 60 kW |
| PV : load ratio | 1.67 (PV ≥ load — self-sufficient by day) |
| Storage autonomy | 200 kWh ÷ 60 kW = 3.3 h |
| PV annual yield | 100 × 4 × 365 × 0.8 = 116,800 kWh/yr |
| Charging annual energy | 60 kW × 6 h × 365 = 131,400 kWh/yr |
Operation strategy
Islanded (off-grid)
PV + storage must cover the 60 kW charging load. Autonomy 3.3 h — size storage for the required runtime at night/cloudy periods.
Full-cost economics (25 yr, discounted @ 8%)
| Component | Value |
|---|---|
| Initial CAPEX | POA |
| Annual O&M (1%/yr) | POA/yr |
| Battery replacement (yr 10) | POA |
| Inverter replacement (yr 15) | POA |
| Net present value (NPV) | POA |
| Simple payback | 3 years |
Bill of materials
| Equipment | Spec | Qty | Subtotal |
|---|---|---|---|
| PV modules | 100 kWp · 4 kWh/m²/day site | 1 | POA |
| PV inverter | 100 kW | 1 | POA |
| Battery energy storage (LFP) | 200 kWh | 1 | POA |
| PCS (power conversion system) | 60 kW | 1 | POA |
| DC fast charger (60 kW) | 60 kW | 1 | POA |
| Total CAPEX | POA |
How it was calculated
- · PV annual yield: E = P × GHI × 365 × PR.
- · Storage autonomy: h = battery kWh ÷ charging load kW.
- · Full-cost economics: CAPEX + discounted O&M (1%/yr) + battery/inverter replacement, with 0.5%/yr PV degradation, discounted at WACC over the project life.
- · Peak-shaving value: battery kWh × cycles/yr × DoD × round-trip efficiency × (peak − valley) tariff.
Referenced standards
| Standard | Scope |
|---|---|
| IEC 61851 | Electric vehicle conductive charging system |
| GB/T 19964 | PV power station grid connection (China) |
| GB/T 36547 | Electrochemical energy storage system grid connection (China) |
| IEC 62933 | Electrical energy storage systems |
Frequently asked questions
How do I size a PV + storage + EV charging system?
Start from daily load: PV capacity covers daytime demand plus battery charging; the battery covers night and peak periods; EV charging adds a large coincident load. A 100 kW PV with 200 kWh storage and 6-10 chargers is a common C&I configuration. The configurator matches PV, BESS and charging capacity and reports the bill of materials and economics.
What is peak-shaving and how does storage enable it?
Peak-shaving charges the battery during low-price or high-PV periods and discharges during peak-price hours to reduce demand charges and grid imports. For a commercial site with a $10/kW monthly demand charge, cutting 200 kW of peak can save $24,000/yr. The configurator sizes the battery for the shaving strategy and quantifies the saving.
How does EV charging change the storage sizing?
EV charging is a sharp evening load that often coincides with peak tariffs, so storage is sized larger to serve it and avoid demand spikes. A 120 kW fast charger can draw 120 kVA; a 10-charger station peaks near 500-1200 kVA. The configurator adds charging load to the peak-shaving model and sizes BESS accordingly.
What battery chemistry is used for C&I energy storage?
LFP (lithium iron phosphate) dominates C&I storage for safety, cycle life (6,000+ cycles at 80% DoD) and cost, versus NMC which offers higher energy density but lower thermal stability. LFP round-trip efficiency is ~90-95%. The configurator prices LFP-based container and cabinet systems per IEC 62619.
What is the payback of a PV + storage + charging project?
Integrated C&I projects typically pay back in 4-7 years where tariffs and demand charges are high, driven by avoided energy cost, demand-charge reduction and EV charging revenue. The configurator computes full-cost economics — LCOE, payback, IRR and NPV — from your tariff, irradiation and load profile.
What grid standards apply to PV + storage + charging?
EV charging follows IEC 61851 and GB/T 51313; energy storage system safety follows IEC 62619/IEC 62933 and GB/T 36547; PV grid connection follows GB/T 19964 and IEEE 1547. The configurator cites these standards in its design basis and selects compliant equipment.
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