Sunnova Solar Review: A Business Buyer's 6-Step Checklist for Warranty, Battery, and EV Charging

I manage purchasing for a 180-person company. It's not a glamorous job—roughly $300,000 in annual spend, 40-ish vendors, and more spreadsheets than I care to admit. In September 2024, my operations director came back from a conference and said, "We're getting solar and EV chargers." Then he handed the project to me. This is the checklist I worked through, plus the mistakes I made along the way. If you're the person responsible for making this happen at your company, I hope it saves you an afternoon.

This is written for business buyers, not homeowners. Our concerns are different: permitting timelines, invoicing, liability, and making sure the system fits a commercial building, not a house. No engineering degree required. There are exactly six steps, and you can run through them in a few focused hours.

Step 1: Read the Sunnova Solar Warranty Before You Read the Brochure

The sales deck is always polished. The warranty document is where the real terms live.

When I asked for the full Sunnova solar warranty, I read all 30+ pages. Not because I wanted to—because I learned the hard way that summaries leave things out. When I took over purchasing in 2020, I signed off on a one-page summary from a vendor. Their invoice didn't match the contract, and we ate $2,400 in rejected expenses. Now I read the actual documents.

Three things I specifically checked in the warranty:

• Coverage periods per component. Panels, inverter, battery, and labor are all covered for different lengths. In the Sunnova proposal, the PV system was 25 years and the battery was 10. Labor was separate.
• Exclusions. Hail, wind, pests, "acts of God"—whatever applies to your region, check if it's excluded. We're in Texas. Hail isn't hypothetical.
• Transferability. If your company moves or sells the building, can the warranty transfer, and at what cost? If you lease your space, the landlord will ask.

Per FTC guidelines (ftc.gov), warranty claims are treated as advertising: they need to be truthful and substantiated.

Warranties aren't all the same, though. I set up a side-by-side spreadsheet comparing the Sunnova solar warranty with a local installer's. That exercise alone told me which vendor was more serious.

Step 2: Filter Sunnova Solar Reviews for Business Use

Most Sunnova solar reviews you find online are from homeowners. Useful for understanding customer service and install quality, but they don't answer the questions a business needs answered: How did commercial permitting go? Did the equipment fit the building's constraints? How was invoicing? Did communication slip during interconnection?

The pattern I noticed in the reviews: negative Sunnova solar reviews weren't about panels failing. They were about communication and timeline slips—especially around interconnection. That tells me the hardware is generally solid, but the process is where things go sideways. Which affects how you approach Step 5.

One caution: per FTC endorsement rules (ftc.gov), reviews that are incentivized or written by affiliated parties need to disclose that relationship. If a review reads like a brochure, trust your instinct.

Step 3: Verify the Components, Not Just the Brand

A solar proposal is only as good as the equipment list. You want names, model numbers, and spec sheets.

In our evaluation, one installer's bid included a Rich Solar charge controller. I hadn't heard of the brand. I looked it up: legitimate mid-range brand, and the controller was MPPT—which is the more efficient type. Fine. But the point is, I had to look it up. If you skip this step, you won't know if you're getting solid components or the cheapest thing someone could find online.

Charge controllers. A charge controller regulates the voltage from the panels to the battery. MPPT is more efficient; PWM is cheaper. For a business system running LFP batteries, MPPT is a reasonable baseline. Ask what's in the quote.

Battery storage rack. This one nearly bit us. The proposal said "battery storage included" but didn't specify the rack. We assumed it would fit in our utility room. It wouldn't have. The car battery storage rack they planned to use—a ventilated metal rack holding the battery modules—needed more clearance than we had and would have blocked the HVAC access door. They swapped to a different rack, but the surveyor found the issue two weeks after the sale, not before.

That's when I noticed a pattern: people think expensive vendors automatically give you detailed specs. Actually, vendors who give detailed specs are the ones who can charge more. The detail comes first; the premium follows.

Step 4: Know What a Level 2 Charger for EV Actually Is

If you're here with "what is a level 2 charger for ev" in your search history, here's the short version:

• Level 1: a standard 120V wall outlet. Adds 3-5 miles of range per hour. Fine for overnight at home; not a business solution.
• Level 2: a 240V circuit (like your dryer). Adds 25-30 miles of range per hour. This is what companies install for employees and fleets.
• Level 3: DC fast charging. Adds 100+ miles in about 20 minutes, but requires expensive infrastructure. Not relevant for most offices.

When a proposal says "we'll include EV charging," ask the explicit question: Level 2, or a Level 1 trickle charger? For a business, Level 1 isn't a solution. It's a token.

The cost of Level 2 is mostly electrical work, not hardware. We paid about $1,500 per charging station. The panel upgrade, trenching, and permits added roughly $6,000. You won't see that line item in the marketing summary.

Step 5: Get the Timeline in Writing—and Pay for Certainty

Here's where I'm most opinionated: pay for certainty when you have a deadline.

A rush fee buys guaranteed delivery, not just speed. In March 2024, we paid $400 extra for rush delivery on IT equipment because missing the event was a $15,000 loss. Same logic applies to solar and EV charging.

Solar projects have three time risks:

• Permitting. City review times vary. Check the published timeline for commercial solar permits in your city.
• Interconnection. The utility queue is the biggest variable—weeks or months. Ask for the utility's estimate in writing.
• Equipment lead times. Battery racks and charge controllers can have lead times. Ask what's in stock.

When a vendor gives you a "best-effort" date, ask: "What's the guaranteed date, and what does it cost to guarantee?" If they can't offer one, that's your answer. An uncertain cheap date is more expensive than a certain expensive one.

After getting burned twice by "probably on time" promises in other categories, we now budget for guaranteed delivery whenever a hard deadline is in play.

Step 6: Run the Math for Your Building

Don't take the vendor's "estimated savings" at face value. Pull your last 12 months of utility bills and build a basic spreadsheet. What matters:

• Current cost per kWh.
• The proposed offset percentage (Sunnova typically offers up to 100% offset—check your proposal).
• Demand charges. Commercial bills include demand charges; solar doesn't always reduce them. Battery can, if sized correctly.
• EV charging load. Four Level 2 chargers add real load. What does that do to your peak demand?

It took me an afternoon. That spreadsheet is the reason we didn't pick the lowest-priced quote.

Common Mistakes I See (and Nearly Made)

1. Not asking for the full equipment schedule. "Components included" isn't good enough. Get model numbers in writing.
2. Assuming warranty = everything. Coverage periods differ by component. Read the exclusions. FTC requires truth in warranty claims (ftc.gov), but the differences are still huge.
3. Not confirming Level 2 vs. Level 1 when someone says "EV charger included." It matters.
4. Ignoring the physical space. A battery rack needs clearance, ventilation, and sometimes fire-rated walls. Have a surveyor confirm before you sign.
5. Choosing the cheapest quote when the deadline is fixed. I skipped the detailed component review in late 2024 because we were rushing. Thought, "what are the odds?" Well, the odds caught up with us—two weeks of delays. Sometimes you need to slow down to speed up.

That's the list. If you only do three things: read the warranty, verify the components, and get the timeline in writing. Everything else follows from those.