About the Clipping Recovery
Clipping recovery analysis quantifies the solar energy clipped by the inverter (because the array's DC output exceeds the inverter's AC rating) and evaluates whether adding battery storage to capture and dispatch that clipped energy is economically justified.
Formula
Clipped energy (kWh) = Σ max(0, DC power − Inverter AC rating) × Δt
- DC power
- Array power at each time step (kW)
- Inverter AC rating
- Inverter's continuous AC output limit (kW)
- Δt
- Time step (h)
How to calculate it
- 1Run a simulation with hourly or sub-hourly irradiance data and the chosen DC:AC ratio.
- 2Sum all time steps where DC power exceeds the inverter limit — this is clipped energy.
- 3Estimate the value of recovered clipped energy (at PPA or retail tariff rate).
- 4Size a BESS to capture the clipped energy; calculate LCOS of that BESS.
- 5Recovery is viable when LCOS of capture < value of recovered energy per kWh.
Worked example
A 1 MWp array with a 0.9 MW inverter clips ~35,000 kWh/year (3.5% of generation). At ₹3.5/kWh, clipped value = ₹1.22 L/year. A 50 kWh BESS to capture peak clips costs ₹15 L → LCOS ≈ ₹12/kWh — recovery is not viable at that tariff. But at a peak-hour ToU tariff of ₹12/kWh, recovery becomes marginal.
What you can calculate
- MWh clipping
- Recovery %
- Revenue ₹
- Oversizing ratio
Frequently asked questions
How much energy is lost to inverter clipping in a typical solar plant?
At a DC:AC ratio of 1.2 in a moderate-irradiance location, clipping losses run 1–3% of annual generation. At 1.4 in a high-irradiance location, clipping can reach 5–8%. For most plants, this is an acceptable trade-off because inverter oversizing costs less than the extra clipped generation. Adding BESS to capture clips becomes attractive only when the value of that energy (peak ToU, ancillary services) significantly exceeds LCOS.
Does clipping affect inverter life?
The inverter limits its output at its rated AC power and dissipates the rest as heat. Frequent sustained clipping (operating at 100% output for many hours daily) can increase thermal stress on inverter components, potentially reducing life. Modern string inverters handle this well within their rated DC:AC ratio range (≤1.3). Exceeding the manufacturer's specified ratio voids warranty in some cases.
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