Solar + Storage for Your Business: A Practical Procurement Checklist

If you're an office administrator or facility manager tasked with looking into solar panels, battery storage, or EV chargers for your company, you're probably staring at a stack of proposals that all sound the same. Lower energy bills. Energy independence. Green credentials.

I've been there. It took me a few years and about a dozen vendor evaluations to figure out what actually matters vs. what's just good marketing. Here's the checklist I wish I'd had from the start.

Step 1: Define Your Company's Actual Energy Goal (Not Just the Vendor's Pitch)

Before you call a single installer, sit down with operations and finance. Pin down the specific outcome you're after. Because if you don't, the vendor will define the goal for you—and it'll be the one that makes their product look best.

Three common goals, and they lead to very different setups:

• Lower monthly operating costs: You want to offset peak demand charges. This means you need battery storage sized to your afternoon load profile, not just a big solar array.
• Backup power for critical operations: You need a system that can island (disconnect from the grid). Not all solar + storage setups do this cleanly. Verify the transfer switch spec.
• EV fleet charging: If you're adding EVs for company vehicles, you need to plan the charger load alongside the battery capacity. A 50kW DC fast charger will pull more than a typical 10kW solar array can supply in real-time.

Write it down. I assumed 'same specs meant same results' across vendors once. Didn't verify. Turned out each had a very different interpretation of 'backup-capable.'

Step 2: Vet Vendor Qualifications—Beyond the Brochure

Here's the thing: any company can slap a solar panel on a roof. The difference is in the installation quality, the warranty support, and what happens when something breaks three years in.

When I managed purchasing for a mid-sized company (processing about 80 orders annually across various service vendors), I learned to verify three things before even looking at pricing:

1. Licensing and insurance: In most states, solar installers need an electrical contractor's license. Ask for their license number and verify it with the state licensing board. This is a 5-minute call that can save you a massive headache.
2. Warranty details in writing: A '25-year warranty' is meaningless if it only covers the panel itself, not the labor to replace it. Get the full warranty document, not just the summary sheet.
3. References from commercial clients of similar size: Residential references don't count. Commercial installations have different permitting, structural, and interconnection requirements.

In my first year managing vendor relationships, I made the classic assumption error: approved a vendor based on a glossy presentation. Their work on a small commercial project looked fine. But when I needed service support? Response times were measured in weeks, not hours. Cost me a lot to redo. (note to self: vet service support before the contract).

Step 3: Get Granular on the System Components

Most proposals you'll get will bundle everything—panels, inverter, battery, monitoring—into a single line item. Push back. You need to understand what each component is and why it was chosen.

Break it down into at least:

• Solar panels: Brand, model, wattage, degradation rate (most panels lose 0.5% to 0.7% efficiency per year—get the actual spec).
• Inverter: String inverter vs. microinverters vs. power optimizers. For commercial roofs with partial shading (AC units, vents), microinverters usually make more sense. But they cost more.
• Battery storage: If you're looking at options like a myenergi battery storage system or comparing it to what Tesla can offer, the key specs are usable capacity (not total), round-trip efficiency (typically 85-95%), and warranty throughput (how many cycles before degradation).
• EV charger: If you're adding an EV charger, confirm it's compatible with the battery inverter. Some setups can't charge a car and power the building at the same time.

The numbers said go with the bundled proposal—15% cheaper than itemized. My gut said something felt off. Turned out the 'compatible' battery system they included had half the usable capacity of the standalone unit they quoted separately. Went with the itemized approach. Worth the extra effort.

Step 4: Analyze Total Cost of Ownership (Not Just the Installation Price)

My view? The lowest quote has cost me more in about 60% of cases over the last five years. That $10,000 savings on a solar installation can turn into a $25,000 problem when the inverter fails after three years and the vendor's support is non-existent.

Build your own TCO comparison. Include:

• Installation cost: Upfront price.
• Equipment quality: Panel degradation matters over 25 years. A 0.5% vs. 0.7% annual degradation is a 5% difference in total energy production over the system's life.
• Warranty coverage: Fully covered vs. pro-rated? Labor included? The fine print matters a lot.
• Estimated maintenance: Solar panels need cleaning (especially in dusty areas). Batteries may need firmware updates. Factor it in.
• Time value of money: That upfront saving vs. recurring risk. (Here's where asking finance for their discount rate comes in.)

Per FTC guidelines, claims about energy savings must be substantiated. A proposal that says 'you'll save 30% on electricity' without showing their math? That's a red flag. Ask for the detailed calculation—with your actual utility rates and usage patterns.

Flexible solar panel kits for boats might be a different beast entirely (and not what this checklist covers), but the principle holds: know the context before trusting any savings claim.

Step 5: Plan for Permitting and Interconnection

This is the part most people glaze over, and it's the part that can delay your project by months.

Before you sign anything, ask your vendor:

• Who handles the building permit application?
• What's the typical timeline for your local AHJ (Authority Having Jurisdiction)?
• Who applies for interconnection with the utility company? (This is required if your system sends power back to the grid.)
• What's the estimated timeline for utility approval? In some areas, it can take 8-12 weeks.

In our 2024 vendor consolidation project, we had a solar installation held up for 14 weeks because the vendor assumed we needed a structural engineering review. The building owner had one from a previous roof replacement. A simple question upfront would have saved months.

Mental note: ask this in the first call, not after you've chosen a vendor.

Step 6: Understand the Incentive Stack (Not Just Federal Tax Credits)

The federal Investment Tax Credit (ITC) is 30% (as of January 2025), but it's a tax credit, not a check. Your company needs enough tax liability to use it. If you're a non-profit or a pass-through entity, the rules are different.

State and local incentives vary wildly. Some states offer property tax exemptions for solar equipment. Others have performance-based rebates. A few have avoided-cost payments for excess energy sent to the grid.

Your vendor should provide a detailed incentive analysis specific to your location and entity type. If they give you a generic '30% ITC' line and nothing else, that's another red flag. (Note to self: verify incentive assumptions before presenting to finance).

Step 7: Define Your 'After-Sale' Support Requirements

Once the system is installed and producing power, the relationship with the vendor isn't over. It's just starting.

Ask specifically:

• Monitoring: Does the system include web-based monitoring? Monthly performance reports? Who gets alerts if something goes wrong?
• Service response time: What's the guaranteed response time for a system failure? 24 hours? 48 hours? A week? In the summer, a downed AC system plus a non-functional solar array is a double hit.
• Battery maintenance: For systems with battery storage (especially if you're looking at options like what a Tesla Powerwall costs vs. a myenergi system), find out if firmware updates are automatic or require a technician visit.

The vendor who couldn't provide proper invoicing cost us $2,400 in rejected expenses once. This is similar: the vendor with opaque service terms will cost you more in the long run.

Step 8: Document Everything (And I Mean Everything)

From the initial quote to the final sign-off, keep a paper trail. This includes:

• All correspondence (email threads, meeting notes)
• Equipment specifications (downloaded, not just links)
• Warranty documentation
• Permitting approvals
• Interconnection agreement
• Final invoice with equipment serial numbers

I assumed a vendor would keep accurate records for warranty claims. Didn't verify. Turned out they didn't keep equipment serial numbers—they just had the invoice date. When a panel failed four years in, proving it was from their original installation took a month of back-and-forth.

Simple solution: create a project folder on a shared drive. Drop everything in there as it comes. It takes 5 minutes per document and saves hours later.

Common Pitfalls to Avoid

A few things I've seen go wrong that you can skip:

• Assuming 'standard installation' means the same to every vendor. Some include conduit runs up to 50 feet; others charge extra after 20. Get the includes/excludes list.
• Focusing only on the solar array and ignoring the battery. If you're interested in solar + storage (and most commercial buyers should be), the battery is where the value is. A solar-only system sends excess power to the grid for pennies. A battery stores it for when you need it.
• Not checking HOA or property restrictions. If you're in a commercial building with an HOA or a historic district, there may be aesthetic restrictions on panel placement. Check before you design.
• Thinking a 'free quote' has no cost. It doesn't have a monetary cost, but it has a time cost. Vague questions from vendors lead to useless quotes. Give them a clear RFP.

Bottom line: this isn't a decision you should rush. Take the time to work through each step. The goal isn't just to buy a solar system—it's to make a smart procurement decision that serves your company for the next 25 years.