Use MicrogridModeler when the decision is a focused, auditable off-grid PV + battery + diesel feasibility screen that runs in the browser and exposes dispatch, assumptions, and lifecycle economics. Use SAM when the main job is free desktop techno-economic analysis of energy technologies, especially PV, battery storage, wind, and project finance. Use HOMER Pro, REopt, Xendee, DER-CAM, or spreadsheets when their broader hybrid-system, optimization, portfolio, research, or arithmetic workflows better match the question.
Key takeaways
- MicrogridModeler is strongest for browser-first off-grid PV + battery + diesel feasibility where deterministic dispatch and auditability matter.
- SAM is a strong free desktop tool for technology and finance analysis across PV, battery storage, wind, and other power-generation technologies.
- SAM is not best treated as a one-for-one replacement for a dedicated microgrid sizing workflow when generator constraints, state of charge, and unmet-load policy drive feasibility.
- HOMER Pro, REopt, Xendee, DER-CAM, and spreadsheets all remain useful, but each answers a different planning question.
- A fair comparison should align load data, weather data, financial assumptions, storage behavior, generator constraints, project life, and unmet-load rules before comparing results.
Comparison matrix
| Criterion | MicrogridModeler | HOMER Pro | REopt | Xendee |
|---|---|---|---|---|
| Best first question | Can this off-grid site be served by PV, batteries, and diesel at the lowest feasible lifecycle cost? | Which hybrid-system configurations and sensitivities should I explore in a mature desktop workflow? | Which DER mix, size, and dispatch improves economics, resilience, emissions, or outage support? | How should a team screen, design, propose, operate, and certify DER or microgrid projects across sites? |
| Primary workflow | Browser-first inputs, deterministic sizing, hourly dispatch, hard feasibility constraints, and audit-ready outputs. | Desktop project setup, simulation, optimization, sensitivity analysis, and hybrid-system reports. | Web, API, or open-source optimization for DER sizing, dispatch, economics, resilience, and critical loads. | Commercial platform workflow for DER portfolios, proposals, operation, power-flow-aware design, and EV infrastructure. |
| Best-fit project | Remote clinics, telecom sites, camps, schools, islands, and early EPC feasibility for PV + battery + diesel. | Hybrid microgrid consulting and coursework that benefit from broad component modules and sensitivity studies. | Facilities, campuses, public agencies, and research teams studying DER economics, resilience, and APIs. | Enterprise DER portfolios, campuses, fleets, critical facilities, consultants, and proposal teams. |
| Where SAM fits | Use as the focused microgrid feasibility model when hourly off-grid constraints decide the answer. | Use HOMER Pro when the study needs classic hybrid-system optimization rather than technology finance depth. | Use REopt when formal DER optimization and resilience goals are central to the study. | Use Xendee when the job is a broader platform workflow, not only a single technology finance case. |
| Main caution | Current scope is intentionally narrow: PV, battery, and diesel are the modeling center. | Can involve more desktop setup and licensing overhead than a quick browser screen requires. | Powerful optimization still needs careful scenario framing and clear explanation for non-specialists. | May be more platform than a student exercise or one-off remote feasibility task needs. |
Direct answer
MicrogridModeler and SAM are both useful, but they sit in different parts of the planning stack. MicrogridModeler is the better fit when a planner needs a focused off-grid PV + battery + diesel feasibility answer, with deterministic dispatch, hard constraints, and an audit trail that another analyst can rerun in a browser.
SAM is the better fit when the task is broad techno-economic analysis of energy technologies and project finance. NREL describes SAM as a free desktop application for techno-economic analysis of energy technologies, used to investigate technical, economic, and financial feasibility of power generation projects. Its public materials list photovoltaic systems, battery storage, wind power, and several financial model types among its scope.
Where MicrogridModeler fits
MicrogridModeler is intentionally narrower than SAM. It is built around the early-stage site question that planners, EPC analysts, and students often need first: can a specific off-grid load be served by PV, batteries, and diesel under explicit constraints, and what does that do to lifecycle cost, diesel fuel use, renewable fraction, and dispatch behavior?
That focus is useful because off-grid feasibility is often decided by the difficult hours: cloudy sequences, evening peaks, generator minimum loading, battery state of charge, reserve margin, and whether unmet load is allowed at all. A browser-first deterministic model keeps those assumptions close to the result instead of burying them in a larger technology-finance study.
- Use it when the deliverable is a first-pass off-grid PV + battery + diesel screen.
- Use it when the audience needs to inspect dispatch, not only LCOE.
- Use it when reproducibility and visible assumptions matter for client review or coursework.
- Use it when a planner needs a small, defensible model before escalating to a full engineering package.
Where SAM fits
SAM is a strong choice when the learning or analysis goal is technology performance and finance. Its public page describes a free desktop application for techno-economic analysis and lists photovoltaic systems, battery storage, wind power, concentrating solar, geothermal, biomass, fuel cells, marine energy, and several project finance structures.
That breadth is valuable for students and analysts. SAM can help a class learn PV performance modeling, storage assumptions, wind technology, behind-the-meter and PPA finance, incentives, and sensitivity to project economics. It is also helpful as a finance and technology cross-check alongside a microgrid feasibility model.
The caution is scope. A tool can be excellent for techno-economic analysis without being the most direct answer to a remote-site PV + battery + diesel microgrid sizing question. If hourly dispatch constraints and unserved-load rules decide whether a system is feasible, use a workflow that makes those constraints explicit.
- Use SAM for free desktop techno-economic analysis and finance education.
- Use SAM when PV, storage, wind, or financial-model detail is the center of the assignment.
- Use SAM as a cross-check for technology costs, production, and project finance assumptions.
- Do not let a simple annual energy comparison substitute for hourly off-grid feasibility.
How HOMER Pro, REopt, and Xendee fit nearby
HOMER Pro remains the familiar hybrid-system benchmark. UL Solutions positions it around lowest-cost solutions for remote power systems, microgrids, and islanded utilities, with simulation, optimization, sensitivity analysis, and add-on modules. If the study needs a broad desktop hybrid-system environment, HOMER Pro deserves a look.
REopt is the public-sector and research-grade optimization neighbor. Its web tool materials say it evaluates hybrid DER economic viability for grid-tied and off-grid buildings, campuses, and microgrids; optimizes DER mix, sizing, and dispatch; and estimates reliability such as critical-load support during outages.
Xendee is broader still: a commercial platform for DER and microgrid design, operation, EV infrastructure, power-flow-aware workflows, proposals, and portfolios. It is often a better fit when the work becomes a program across many sites rather than one off-grid feasibility model.
Where DER-CAM and spreadsheets help
DER-CAM belongs in the adjacent research and optimization category. Berkeley Lab presents it as a distributed energy resource customer adoption model for investment and operation decisions. That makes it useful context for analysts studying DER optimization methods, even if it is not the first tool a site planner opens for a quick remote PV + battery + diesel screen.
Spreadsheets are still worth keeping. They are good for checking unit conversions, fuel price, capital cost, replacement schedules, and simple net present value logic. Their weakness is not transparency; it is that hourly state of charge, generator constraints, curtailment, and unmet-load policy become easy to oversimplify.
How to compare MicrogridModeler and SAM fairly
Start by deciding whether the question is a technology-finance study or an off-grid microgrid feasibility study. If the question is project finance for PV, battery storage, wind, or another technology, SAM may be the cleaner starting point. If the question is whether a remote load can be served hour by hour with PV, batteries, and diesel, MicrogridModeler is more direct.
For any side-by-side comparison, hold the assumptions steady. Use the same hourly load, weather source, PV derate, battery usable capacity, round-trip efficiency, diesel fuel price, generator minimum load, replacement schedule, project life, discount rate, and unmet-load rule. Otherwise a result difference may come from model setup rather than tool capability.
- Compare dispatch traces and unmet-load behavior before comparing LCOE.
- Record whether the model is optimizing size or only simulating a specified design.
- Keep model versions, source pages, screenshots, and exported inputs with the recommendation.
- Use SAM or spreadsheets to sanity-check finance assumptions, then verify hourly feasibility in a microgrid workflow.
- Ask which constraint drives the answer: load peak, autonomy, renewable fraction, generator turndown, or finance.
A note for students
Students should use SAM and MicrogridModeler together when possible. SAM is helpful for learning how energy technologies and project finance are represented. MicrogridModeler is helpful for seeing how those assumptions play out in an off-grid dispatch problem with PV, batteries, diesel, state of charge, fuel consumption, and feasibility constraints.
A strong assignment is to define one simple remote site, run a finance-oriented case in SAM, run an off-grid feasibility case in MicrogridModeler, and then explain which assumptions could be aligned and which questions each tool answered better.
Bottom line
Choose MicrogridModeler when the job is fast, auditable off-grid PV + battery + diesel feasibility in the browser. Choose SAM when the job is free desktop techno-economic analysis, technology education, or detailed project finance. Choose HOMER Pro, REopt, Xendee, DER-CAM, or spreadsheets when their specific strengths fit the decision better.
The practical rule is simple: use the smallest tool that answers the real planning question, and preserve enough assumptions that another analyst can reproduce the answer.
Sources and review notes
This comparison is based on public product and documentation pages reviewed for the 2026 planning context. Always verify current licenses, modules, and pricing before making procurement decisions.
FAQ
Is MicrogridModeler a SAM alternative?
Yes, for a narrower job: browser-first off-grid PV + battery + diesel feasibility with deterministic dispatch and auditable assumptions. SAM is broader for free desktop techno-economic analysis of energy technologies and finance.
When should I use SAM instead of MicrogridModeler?
Use SAM when the main question is PV, storage, wind, or project finance performance, especially for education or technology-specific techno-economic analysis rather than a focused off-grid dispatch feasibility screen.
When should I use MicrogridModeler instead of SAM?
Use MicrogridModeler when you need to test whether an off-grid load can be served hour by hour with PV, batteries, and diesel, while preserving assumptions, dispatch, economics, and feasibility constraints in a browser workflow.
Can SAM model batteries and PV?
Yes. SAM public materials list photovoltaic systems and battery storage among the technologies it can model. The selection question is whether your project mainly needs technology-finance analysis or a dedicated microgrid feasibility workflow.
Should students learn SAM, MicrogridModeler, or HOMER Pro first?
Students should learn the question first. Use SAM for technology and finance fundamentals, MicrogridModeler for auditable off-grid PV + battery + diesel dispatch, and HOMER Pro for classic hybrid-system simulation, optimization, and sensitivity studies.
Run the comparison on your own site
Open a benchmark, change the load or cost assumptions, and inspect the dispatch behind the economics.