For recruiters & hiring managers

BESS Interview Questions — Candidate Screening Guide

Interview prompts for hiring into utility-scale battery energy storage roles — for recruiters and hiring managers alike. Pick a role and use the prompts to open a conversation. Each comes with what an experienced answer tends to cover, so you can read the depth behind a candidate’s response — whether you’re screening outside your own expertise or getting up to speed on the topics.

How to use this. This is not a pass/fail test, and there are no trick questions or single right answers. The prompts are open on purpose — they surface how much hands-on BESS experience a candidate has and how they think about the work. A candidate who is light in an area isn’t disqualified; much of this is learned on the job. Use the “what to listen for” notes to steer the conversation and to read the depth behind an answer.

Solution Manager

Translates a customer’s needs into a technical BESS solution — sizing, application, topology, and the bridge between sales and engineering. The prompts probe how they scope a problem and connect technology to revenue.

⚑ This title means different things by employer This is the most ambiguous title in the industry. At a manufacturer or system integrator it is closer to applications / product engineering — sizing and configuring the product to a use case, supporting pre-sales. At an EPC contractor it means designing the whole delivered plant so it is buildable, integrated, and grid-compliant. At a developer or owner it leans commercial-technical — shaping the configuration for revenue and bankability. Worth confirming with the hiring manager which of these they mean before you screen.

A customer says they want a “100 MW battery.” What do you ask before you can propose anything?

What to listen forWhether they instinctively separate power (MW) from energy/duration (MWh), and ask about the use case (arbitrage, ancillary services, capacity, backup), the grid connection point and voltage, the target market, and the budget. Experienced people scope the problem before reaching for a product.
How do you decide the right storage duration for a project — 1-hour, 2-hour, 4-hour?

What to listen forHow they link duration to the revenue application and market — fast power-based services for short duration, capacity and arbitrage for longer — plus the grid-connection limit and the cost trade-off. Depth shows when they connect duration to money, not just to a spec sheet.
Walk me through how you’d put together a solution for a customer who wants to stack arbitrage and frequency response.

What to listen forComfort with revenue stacking and the idea that the same capacity can’t be sold twice at once (co-optimisation), sizing for the binding application, and the role of the route-to-market provider. Reveals whether they’ve actually built revenue cases or only quoted hardware.
When would you propose an AC-block solution versus a DC-block solution, or a central versus a string PCS?

What to listen forReal trade-off thinking — integration scope and single-supplier dependency for an AC block; cost and fewer maintenance points versus finer control and redundancy for central vs string PCS. This is where a genuine solution engineer separates from someone reading a catalogue.
How do you handle it when sales has promised something the engineering team says isn’t deliverable?

What to listen forThe bridging instinct at the heart of the role — how they manage the commercial-vs-technical tension, reset expectations, and protect both the customer relationship and the project. Experience shows in concrete examples rather than process language.
What’s changed in how you spec a BESS over the last couple of years?

What to listen forCurrency with the market — larger cells and higher-density LFP containers, liquid cooling, augmentation planning, grid-forming requirements, and bankability or domestic-content pressures. Tells you whether they’re actively in the market or working from older knowledge.

Project Manager

Delivers the project from financial close through construction and commissioning to commercial operation. The prompts probe lifecycle fluency and how they handle schedule, interfaces, and site reality.

⚑ This title means different things by employer At an EPC contractor this is the hands-on delivery role — running construction and commissioning through to COD. At a developer or owner it is more of an owner’s PM, overseeing the EPC and delivery parties, weighted toward contract management and oversight than site execution. At a manufacturer it narrows to supply / contract management — equipment delivery, Factory Acceptance Tests, and logistics. The depth and type of experience that fits depends heavily on which.

Walk me through the phases of a BESS project from financial close to commercial operation.

What to listen forFluency across Notice to Proceed, detailed engineering, procurement and manufacturing (including Factory Acceptance Test), construction, commissioning (cold then hot), Site Acceptance Test, and handover/COD. Someone who has delivered narrates it naturally; someone who hasn’t recites a generic plan.
On your projects, what’s usually the long-pole item that threatens the schedule?

What to listen forConcrete delivery pain — HV substation / main transformer lead time, grid connection and energisation dependencies, equipment shipping, grid-operator witnessing. Real PMs have specific war stories; theory-only candidates stay vague.
How do you manage the interfaces between the DC block supplier, the PCS supplier, and the Balance-of-Plant contractor?

What to listen forAwareness that in a split-contract model the owner (and so the PM) carries integration risk, and how they coordinate technical interfaces, responsibilities, and timing across vendors. Reveals whether they’ve actually run multi-vendor delivery.
Tell me about a commissioning or grid-compliance issue you’ve worked through.

What to listen forHands-on detail — energisation, PCS synchronisation, protection settings, grid-code testing and witnessing — and how they resolved it with the vendor and the grid operator. Specifics signal real site experience over classroom knowledge.
What does handover / Commercial Operation Date actually trigger, and how do you prepare for it?

What to listen forUnderstanding that COD starts the Defects Liability Period, the warranty clocks, and commercial operation, with the documentation and acceptance (SAT) behind it. Shows contractual and close-out experience, not just construction.
How do you keep risks and contingencies under control across construction?

What to listen forPractical risk handling — ground conditions, weather, supply delays, change orders — and how they protect the critical path and the budget. Experience shows in how they prioritise, not in risk-management buzzwords.

Sales / Business Development

Originates and sells BESS projects or solutions and builds the commercial case. The prompts probe value-chain understanding, revenue knowledge, and commercial fluency.

⚑ This title means different things by employer What they sell changes everything. At a manufacturer it is equipment — cells, DC blocks, PCS, AC blocks — so the pitch is product and bankability. At an EPC contractor it is the turnkey delivery service, won largely through tenders. At a developer it is originating or selling projects — land, grid rights, development. At a route-to-market / optimiser it is the trading and optimisation service. A great seller in one of these isn’t automatically a fit for another.

Who are the real buyers in a BESS deal, and what does each one actually care about?

What to listen forFluency across the value chain — developers, asset owners / IPPs, utilities, investors, EPCs — and that each weighs price, bankability, delivery, and risk differently. Reveals whether they’ve sold into this market or are generalists applying a template.
How do you explain a BESS business case to a customer — what’s driving the revenue?

What to listen forComfort with the revenue streams (energy arbitrage, balancing / ancillary services, capacity), revenue stacking, and how market and duration shape returns. A strong BD can tell the money story; a weaker one sells on hardware specs.
What’s different about selling to a developer versus an asset owner versus an EPC?

What to listen forUnderstanding of where each sits in the chain, their decision drivers and timelines, and how the pitch and the deal change accordingly. Signals real channel experience rather than one-size-fits-all selling.
A customer is comparing your price to a cheaper Tier-2 supplier. How do you handle it?

What to listen forValue-selling grounded in bankability — warranties, track record, lender acceptance, total cost over the asset’s life — rather than reflexive discounting. Tells you whether they understand why price isn’t the whole story in this market.
What commercial or contract structures have you worked with — tolling, floor-and-upside, merchant?

What to listen forFamiliarity with how revenue risk is shared between owner and route-to-market provider, and how that affects the deal and the customer’s financing. Depth here signals genuine commercial experience, not just relationship selling.
How has demand in this market shifted lately, and how has it changed your pitch?

What to listen forCurrency — longer durations, grid-forming, bankability and domestic-content pressure, and ancillary-market saturation pushing toward trading. Reveals whether they’re actively in the market or relying on a pitch from a couple of years ago.

The topics behind these prompts — the technology, the value chain, how BESS makes money, project delivery, compliance, and bankability — are what the utility-scale BESS course covers. A useful pointer for candidates getting up to speed, or for recruiters who want to follow the conversation more closely.