10 kW Residential Grid-Tie Solar Plant Cost Breakdown (Q3 2026 China Supplier Pricing)
10 kW Residential Grid-Tie Solar Plant Cost Breakdown (Q3 2026 China Supplier Pricing) — itemized bill of materials and FOB pricing for a typical configuration.
Estimated total (FOB): $3,282
Bill of materials
| Item | Specification | Qty | Price (USD) |
|---|---|---|---|
| PV Modules | 550Wp Mono | 24 | $1,452 |
| Grid-Tied String Inverter | 10kW | 1 | $1,000 |
| PV Mounting (rooftop) | 13kWp · tilt 25.9° | 1 | $650 |
| DC Cable PV1-F 4mm² | ΔU 0.5% @ 30m | 36 | $13 |
| MC4 Connector | male/female pair | 28 | $39 |
| DC Surge Protector | 40kA 1000V | 2 | $16 |
| AC Distribution Box | breaker/SPD/anti-islanding | 1 | $60 |
| Monitoring Module | WiFi/4G APP | 1 | $40 |
| Mounting Accessories | clamps/bolts/earthing | 24 | $12 |
Single-line diagram
How it was calculated
- ['PV capacity', '10kW x 1.3 = 13.0 kWp']
- ['Module count', '13000Wp / 550W = 24 pcs']
- ['String design', '2 strings x ~12 modules']
- ['String limits', 'temp-corrected 3-18 modules/string (Voc 55.4V cold / Vmp 36.6V hot)']
- ['DC voltage drop', '0.5% (PV1-F 4mm², 30m run)']
- ['Mounting', 'tilt 25.9° · row spacing 3.4m']
- ['Performance ratio (PR)', '0.98 soiling x 0.97 mismatch x 0.98 wiring x 0.975 inverter x 0.92 temp = 0.836']
- ['Inverter', 'nearest rating 10kW']
- ['LCOE (full-cost)', '$0.0610/kWh over 25 yr (O&M + WACC + inverter replacement + degradation)']
- ['Turnkey cost', 'FOB 3,282 → installed 7,352 (50% soft + 12% landing)']
- ['Payback / IRR / NPV', '4.8 yr · IRR 20.2% · NPV $8,310 · DSCR 2.35']
What drives the cost
- Equipment — the transformer/switchgear/inverter is the largest single line item.
- Storage (where applicable) — batteries are the biggest swing factor.
- Copper & freight — copper-linked cabling and freight shift landed cost ±5–10%.
Frequently asked questions
What is the difference between P50, P75 and P90 solar yield?
P50, P75 and P90 are exceedance-probability energy estimates accounting for interannual weather variability. P50 is the median year (50% chance of exceeding), P90 is exceeded in 90% of years and is the conservative 'bankable' value lenders require. With a typical interannual CV of 4-6%, P90 is roughly 7-10% below P50. The calculator reports all three plus LCOE.
How is LCOE calculated for a solar system?
LCOE divides lifetime discounted costs (capex, O&M, WACC financing, inverter replacement, module degradation) by lifetime discounted energy. The calculator uses a full-cost model: 25-year life, 0.5%/yr module degradation, WACC around 6-8%, and O&M about 1-1.5% of capex yearly. A 200 kW C&I system in a 4.5 sun-hour site typically lands near $0.04-0.06/kWh.
What tilt angle maximizes annual PV yield?
For a fixed-tilt array, annual yield is near-optimal when tilt equals the site latitude, typically latitude minus 5-15 degrees in low latitudes to favour summer load, or latitude plus 10-15 degrees for winter-heavy or off-grid loads. At 30 deg latitude the optimum is roughly 25-35 degrees. The calculator's yield model accounts for tilt, azimuth and local irradiation.
How many kWh per year does a 100 kW solar system generate?
Annual energy is roughly system kW x peak-sun-hours x performance ratio. A 100 kW array in a 4.5 sun-hour region with a PR of 0.78-0.82 yields about 100 x 4.5 x 365 x 0.80 = 131,000 kWh/yr. In sunnier regions (5.5-6 sun-hours) the same plant reaches 160,000-175,000 kWh/yr. The calculator computes P50/P75/P90 from these inputs.
What battery capacity do I need for night-time backup?
Battery capacity = daily night-time load kWh divided by depth of discharge, times autonomy days. For a 40 kWh nightly load with lithium at 80% DoD and one-day autonomy you need about 50 kWh. Add 15-20% for round-trip losses (AC-coupled ~85-90% efficiency). The configurator sizes the bank, matching PCS and cell chemistry automatically.
Off-grid vs grid-tie — which solar configuration is cheaper?
Grid-tie is 30-50% cheaper because it omits batteries and the backup inverter. A 10 kW grid-tie system runs roughly $8,000-12,000 FOB, while an equivalent off-grid system with 20-30 kWh storage and a hybrid inverter costs $18,000-28,000. Off-grid makes sense only where grid connection is absent or very expensive; the calculator prices both scenarios.
Size your own configuration
Run the calculator for your exact load and get a full BOM + FOB price.
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