A Business Buyer's Checklist for Evaluating Sunnova Solar Lease, Storage, and EV Charging

Who this checklist is for

If you're the person who has to make a solar-plus-storage procurement decision actually work, not the salesperson making it sound good, this checklist is for you. I've been office administrator for a 260-person company since 2020, and I manage facility-related purchasing across eight vendors—about $320,000 a year. Maybe $300,000, I'd have to check. I report to both operations and finance, so billing details matter to me. When our CEO asked me to evaluate a Sunnova solar lease for our headquarters, I had no solar background. I had to build a process fast.

This works best if you are at the point of comparing offers or about to sign a site permit. It assumes you're not looking for a deep engineering review. You need a repeatable way to separate real value from a tight pitch. Here are six steps, plus the mistakes I still think about.

Step 1: Define the problem before you look at the production number

Solar leases are usually pitched with one number: the system size in kW and the monthly lease payment. That's not enough. I assumed our current utility bill would tell me everything about what we needed. Didn't verify the hourly load shape. Turned out our office peaks in the afternoon, but not the evening peak we assumed. We almost sized the system to cover a base load that looked steady on paper but wasn't.

Before calling an installer, write down what you're solving for:

• Is the goal lower monthly operating cost? Then you need a lease or PPA with a realistic escalation rate and production estimate.
• Is the goal backup power? Then you need a battery, not just solar.
• Is the goal EV charging? Then you need a larger system and a panel capacity review.

If you can't answer these, skip the bid process until you can. This sounds obvious, but it is exactly where I almost went wrong.

Step 2: Run a complaint search like a source audit, not a scare tactic

When someone says 'solar leasing,' do the same thing you'd do with any large vendor: search for the company name and the word complaints. Specifically, search for Sunnova Solar Corporation complaints. Don't panic if you see complaints—a national solar provider will have some volume. The key is how each complaint was answered.

I look for three things: does the company reply with an explanation and a case number; does the response address the actual issue or just say 'we will contact you'; and are the same unresolved issues repeated—for example, transfer or buyout problems.

For solar providers, state consumer affairs offices and the BBB are useful. Also check the state contractor license board for the installer, because Sunnova may be the lease provider while a local company does the installation. In our 2024 vendor consolidation project, I found three different companies operating under one brand, and their accountability paths were completely different.

Step 3: Read the lease like a utility contract, line by line

A Sunnova solar lease is a financing structure. You are renting the equipment, and Sunnova owns it. That matters for taxes, maintenance, and what happens at the end. 'You want lower bills' isn't enough; you need the contract terms.

Ask for and compare these clauses:

• Escalator: Is the monthly payment fixed, or does it go up 1%-3% per year? When does the first escalation start?
• Buyout: What formula determines the buyout price at year five, ten, and fifteen? If you want to buy before the term ends, is that price based on a depreciated fair market value or a set schedule?
• End of term: Do you renew, buy, or have the system removed? Who pays for removal and roof restoration?
• Maintenance: What is included? Is the monitoring fee in the lease or separate? What is the guaranteed response time for a failed inverter?

One thing most people ignore: invoicing process. I still kick myself for approving a vendor once without checking their invoice format. They could only produce a handwritten receipt, our finance team rejected it, and I ate $2,400 out of my department budget. Now I ask for a sample invoice before any contract. Ask whether the lease invoice can be emailed to a shared accounting address and whether it is itemized enough for your expense coding.

Step 4: Compare battery chemistry, not just battery name

If you're adding storage, the battery spec matters more than the software app. Many storage systems use NMC chemistry. In cold climates, ask for a LiFePO4 heated battery—lithium iron phosphate with an internal heater—because it keeps more usable capacity when temperatures drop. LFP also has a longer cycle life and better thermal stability than NMC, although it is typically heavier and less energy-dense.

Ask for these battery specs in writing:

• Usable capacity in kWh, not just gross capacity.
• Continuous power output in kW, and whether that changes in cold weather.
• Chemical type: LFP or NMC? Does it include a heater?
• Number of cycles and degradation warranty terms.

Why does this matter? Because a battery with plenty of kWh can still be useless for EV charging if the inverter can't deliver the power. What I mean is: 13.5 kWh is capacity; kW is power. As a baseline, many people search 'Tesla Powerwall battery size' and compare to it. Tesla's spec sheet, as of January 2025, states 13.5 kWh of usable energy per Powerwall (verify current specs at tesla.com). That does not make it better or worse than an LFP system in a Sunnova lease. It only gives you a number to anchor against.

Step 5: Plan EV chargers before the solar system size is final

EV charging is a demand event, not a small add-on. A single Level 2 charger can add roughly 7 kW to the facility load. If you have four chargers and a solar lease sized for existing office load, you'll either be buying grid power during charging windows or paying to upgrade the system later.

In a 2024 project, I consolidated orders for our maintenance team and included a solar plus storage request for EV charging. The sales rep asked, 'How many employees drive EVs?' I said eight. Then we checked the panel: it was at 90% capacity. We had to upgrade before we could connect chargers. That changed the whole timeline. If I could redo that decision, I'd commission a load analysis before signing the solar agreement. At the time, I thought EV charging was a separate project. It isn't.

If Sunnova's lease quote includes EV charging, ask for the total load calculation and the charger location. The battery and the chargers should be designed as one system.

Step 6: Know the alternatives, including 'how much is a home wind turbine'

When I tell people I'm evaluating solar, someone always brings up wind. If you've ever typed 'how much is a home wind turbine' into a search engine, here's your answer. According to DOE WINDExchange (energy.gov/windexchange), a small wind turbine for a home or small business typically costs between $5,000 and $75,000 installed, as of January 2025. The range is large because a 400-watt turbine is not the same as a 10 kW machine on a tall tower. For most commercial and suburban sites, rooftop solar is easier to permit, quieter, and has fewer setback requirements. Wind only gets interesting if you have land, wind speeds consistently above 7 miles per hour, and no local height restrictions.

But here is the efficiency angle. A solar lease with storage is a bundled service: no capital outlay, no operations and maintenance staff, predictable payment. Wind turbines require more ongoing maintenance. If your core mission is to reduce admin workload, that matters. I'm not anti-wind. I just want the total cost of ownership in writing. The same reason I like digital procurement tools—they eliminate repeat work—is why bundled solar storage can make sense for a small business.

The final checklist

Before you sign, you should be able to say yes to these:

• I know the exact problem the system solves: cost, backup, or charging.
• I read the complaint history and the resolution pattern, not just the count.
• I have a sample invoice and know the billing process.
• I know the battery chemistry, usable capacity, and cold-weather spec.
• I have a panel load analysis and an EV charging plan.
• I compared the lease with a purchase and with wind as an alternative using current prices.

Also, remember prices and incentives change. As of January 2025, the federal solar investment tax credit for commercial projects is 30% for projects that start construction by 2032 (Source: IRS and DOE, accessed January 2025). We used DSIRE to confirm our state net metering policy before finalizing anything. Verify current rates and rules at those sources before making a decision.

Mistakes I still think about

Looking back, I should have asked for the removal cost guarantee at the start. At the time, I focused on monthly savings and battery features. Then a friend in property management told me their last solar lease vendor quoted $12,000 to remove and restore the roof at end of term. No one mentions that line until year 15 (unfortunately). Get it in writing.

The most frustrating part of solar procurement for me was not the technology—it was that the contract, the equipment, and the installation were managed by different teams. You'd think one company name means one point of accountability. It doesn't. That's why the complaint search and the contract review are the real work. The solar panels are the easy part.

If you take one thing from this: don't let the solar production estimate be the entire decision. The lease terms, battery chemistry, and invoicing process determine whether this will be a simple monthly bill or a recurring headache. An average system with a clean contract is better than a great system with a messy one. That's the part no public record will tell you.