Define the system.
State the purpose, technology, rating basis, and operating requirement. Make the units and measurement boundary explicit.
Estimating 101
Before a cost,a clear basis.
This is how I frame an estimate: define the system, understand the installation, and make the assumptions visible.
Explore a few fundamental relationships. These are illustrative examples, not project prices.
Battery Storage Scenario Modeler
From Capacity to Project Value.
Illustrative ScenarioConstant USDPre-Tax · Unlevered
Project Net Present Value
$52.1 M Positive NPV
Scenario Current
Cumulative Discounted Cash FlowYear 15 $52.1M
USD, MillionsDiscounted Break-Even 7.8 yr
Augmentation: Year 7 · Year 14
Levelized Cost of Storage
$139.4 /MWh
Simple Payback
5.3 yr
Initial CapEx
$102.0 M
Annual Operating Cost
$7.0 M
Year 1Delivered Energy
400 MWh100 MW · 4 h
200 MW
0 h8 h
Illustrative inputs and outcomes. No project-specific pricing.
The same capacity.
Different construction.
The rating is a starting point. Layout, routes, interfaces, and site conditions determine what has to be built.
Conceptual energy system imagery
The estimating sequence
Turn a system description into a reviewable scope.
Set the scope boundary.
Identify what is included, where responsibility changes, and which supporting systems or interfaces need attention.
Translate into quantities.
Connect the system basis to equipment, assemblies, routes, and installation requirements. Keep each quantity traceable.
Account for conditions.
Consider site constraints, access, sequencing, testing, and delivery. These conditions affect how the work can be performed.
Review the uncertainty.
Separate confirmed information from assumptions and unresolved decisions. Explain what a change in the basis could affect.
A little more context
The questions behind the number.
Technical background: U.S. Department of Energy, solar and storage fundamentals; System Advisor Model, PV capacity and DC/AC ratio.
Electrical estimating & systems
An estimate should be explainable.
What is included. What is assumed. What could change.