Cost Estimation

How to Estimate Cost for Microgrid and Distributed Energy Equipment

What actually drives cost per unit on a microgrid skid, how to build a bottom-up quote, and the misses that swing final price by 15 to 25 percent.

A microgrid skid quote breaks into roughly 55 to 65 percent material, 20 to 30 percent labor, 8 to 12 percent test and commissioning, and 10 to 15 percent overhead and margin. On a 2 MW and 4 MWh containerized system quoting near 1.6 million dollars, that is about 1.0 million in hardware and 350,000 in labor. Costing by weight or by watt alone misses the terminations, testing, and engineering that swing final price 15 percent. This guide walks the cost drivers per unit and where quotes leak money. The core formulas live in the calculations guide; here the focus stays on dollars.

Battery cells dominate material cost. At 2026 pricing, LFP packs run 115 to 145 dollars per kWh at the rack, so 4 MWh is 460,000 to 580,000 dollars. Inverters add 60 to 90 dollars per kW AC, or 120,000 to 180,000 dollars for 2 MW. Copper is the volatile line: 500 kcmil cable runs 14 to 22 dollars per foot, so a 2,400 ft pull swings 19,000 dollars on price alone. Switchgear steel and breakers add 8,000 to 14,000 dollars per section. Use Cable Kit Completeness to catch missing lugs and glands before they become expedited buys at 3x list.

Shop labor at a 95 to 130 dollar loaded rate turns build hours straight into cost. A switchgear lineup at 348 hours is 33,000 to 45,000 dollars before it ships. Field labor carries a premium: electricians run 85 to 145 dollars loaded, and per diem plus travel adds 200 to 350 dollars per day per worker. A 352-hour field install with a 4-person crew for 11 days can hide 15,000 dollars in per diem alone. Run the Switchgear Assembly Hours and Field Install Labor calculators with your real rates, not a blended average, or margin quietly evaporates on the field side of the job.

Factory acceptance testing is billable time plus real energy. A full-load FAT on a 2 MW inverter block cycled for 8 hours pushes megawatt-hours through a load bank; at 0.12 dollars per kWh and 60 percent duty, that is meaningful power on top of load bank rental at 1,500 to 3,000 dollars per day. The Factory Acceptance Test Energy calculator estimates kWh consumed so you can bill it back. Protection relay testing and Controls Commissioning Load add 40 to 120 engineer-hours; skipping the estimate here is exactly why test lines get quoted at zero and eaten as overhead.

Rework is the silent margin killer. A miswired CT found at FAT costs 4 to 8 hours to trace and correct; found in the field it costs a truck roll at 1,200 to 2,500 dollars plus schedule slip. Cable kit shortages force expedited orders, and a missing batch of compression lugs air-freighted runs 5x the planned unit cost. Track first-pass yield on terminations: at a 2 percent defect rate on 640 terminations, that is 13 rework points at roughly 1 hour each. Cable Kit Completeness pays for itself the first time it catches a short-shipped reel before the crew mobilizes.

Engineering and interconnect review are real costs, not free overhead. A utility interconnection study and protection coordination package runs 8,000 to 40,000 dollars depending on whether it triggers a full impact study; the Grid Interconnect Review Load calculator sizes the review hours so you can price them. Controls programming and commissioning for a multi-asset microgrid adds 120 to 300 hours at 130 to 175 dollars. Roll shop overhead at 18 to 28 percent of direct labor and G and A at 8 to 12 percent of cost before margin, or that burden lands on your margin instead of the customer's invoice.

Build the quote bottom up: bill of materials at quoted vendor pricing, plus build hours times shop rate, plus field hours times field rate with per diem, plus test energy and commissioning, plus engineering, then overhead and a target margin of 12 to 20 percent. Add a contingency of 3 to 6 percent for copper and cell price movement, which can shift 20,000 dollars over a 12-week lead time. Lock vendor quotes at 30-day validity and reprice if the order slips. A defensible quote shows each line, not a single dollars-per-kWh number the customer will benchmark against a cheaper, thinner scope.

Three misses recur. Quoting watts and forgetting terminations understates labor 10 to 20 percent. Using nameplate energy instead of usable energy inflates the quote and loses the bid. Treating FAT and interconnect review as zero eats 8 to 12 percent silently. Estimators also blend field and shop rates, hiding the per diem and travel that add 8 to 12 percent on remote sites. Reconcile every closed job's actual cost against the quote within 30 days and feed the variance back; shops that do this hold quote accuracy inside 7 percent instead of the typical 15 to 25 percent swing.

Published 2026-07-02.