5-Step Purchasing Checklist for Solar, Batteries & EV Chargers: From First Solar to Jackery

I manage purchasing for a 120-person company—roughly $200K annually across vendors for everything from office supplies to energy equipment. When we decided to go greener in 2023, I got handed four separate projects: sourcing utility-scale solar panels for our new warehouse, buying portable generators for field teams, shipping lithium batteries for prototypes, and installing EV chargers in our condo parking lot. Each came with its own paperwork and pitfalls. Here's the checklist I wish I'd had—five steps that cover the whole messy range.

When to Use This Checklist

If you're an admin or procurement person tasked with any combination of these: large photovoltaic module orders (think First Solar), portable solar generators sold at retailers like Harbor Freight (Jackery), lithium battery shipping documentation, or EV charger installation in a multi-unit building. This isn't for homeowners—this is for the person who has to get it done without making their VP look bad.

Step 1: Scope Your Needs Before You Search

Don't jump into product specs first. Start by answering: What are we powering, and how many people depend on it?

• For large solar arrays: You need nameplate capacity (kW), footprint, and degradation guarantees. I assumed 400W panels were the same across manufacturers. Didn't verify—turned out one had a 0.5% annual degradation, another 0.7%. Over 30 years that's a real difference.
• For portable generators: Check your team's actual usage. We bought Jackery 2000 Pro units from Harbor Freight (good price, but verify stock) after someone insisted we needed 3,000Wh. Turned out we only ever used 800Wh per day.
• For EV chargers: Level 2 or Level 1? How many parking spots? Our condo board initially said "one charger"—then realized we needed 4 shared plugs. That doubled the trenching cost.

Step 2: Choose Proven Vendors—and Verify Their Addresses

This is where most procurement goes wrong: they pick the cheapest or fastest without checking the vendor's real capacity. For utility-scale modules, I went with First Solar based on their backlog (66 GW) and low degradation rate (<0.5%). Worth noting: their New Iberia, Louisiana factory (first solar new iberia) is a major US production hub. If you need their official address for paperwork, it's 350 West Washington Street, Suite 600, Tempe, AZ 85281—but for shipping you'll want the New Iberia site coordinates. I keep a list of all vendor addresses in our system to avoid customs delays.

For portable solar, Jackery is solid—they manufacture in China but have US warehouses. Harbor Freight carries them in-store (I've seen the display), but always call ahead. The "in stock" online might be wrong.

What about EV chargers? I learned never to assume the contractor's quote includes trenching or electrical panel upgrades after getting a $2,400 surprise. Get a site visit first.

Step 3: Don't Skip the Lithium Battery Declaration Form

If your order involves shipping lithium batteries (standalone or inside generators), you need a Lithium Battery Declaration Form. I ignored this once when sending a Jackery unit to a field office via FedEx. The driver refused pickup. Turned out FedEx requires a hazard declaration for any battery over 100Wh. Jackery 2000 Pro is 2300Wh—definitely above. The form is simple: UN3480 or UN3481, number of cells, watt-hours, and your company's emergency contact. Download it from the carrier's website. I now attach it to every battery order confirmation.

People think only big shippers need this—actually, even a single unit counts. The 'local is always faster' thinking comes from an era before battery regulations. Today, FedEx Ground can take an extra 3–5 days if the paperwork is missing.

Step 4: Plan the EV Charger Installation (Condos Are Different)

Installing an EV charger in a condo adds layers: HOA approval, shared electrical capacity, and sometimes metering disputes. Here's what I did that worked:

• Get written HOA permission first. Our board rejected the first proposal because the electrician didn't include a load study.
• Check the building's main panel capacity. We assumed 200A was enough—turned out the panel already fed 3 HVAC units. Had to install a load shed device (+$800).
• Choose a smart charger. Brands like ChargePoint or JuiceBox allow shared billing. We use a simple per-kWh split.
• Hire an electrician who works with condos regularly. The guy we almost hired had never dealt with HOA paperwork. He'd have delayed us 3 weeks.

Installation took about 3 weeks—or rather, closer to 5 after the HOA review cycle. Budget 2–3 months for the full process.

Step 5: Audit Your Costs and Timelines

After all orders are placed, I do a post-mortem. For our large solar order (First Solar Series 7 modules), the quoted price excluded shipping from Louisiana—a $1,200 surprise. The Jackery units from Harbor Freight were priced fine but had a 2-week lead time I wasn't told about. The lithium battery declaration form added zero cost but 10 minutes of paperwork. The EV charger installation cost $3,800 all-in (including the panel upgrade) vs. a contractor's initial $2,200 quote that "didn't include electrical work."

My biggest lesson: always ask 'what's NOT included' before 'what's the price.' The vendor who lists all fees upfront—even if the total looks higher—usually costs less in the end.

Common Mistakes to Avoid

• Mixing up First Solar module sizes: Series 6 vs. Series 7 have different dimensions. Check datasheets. I mixed them up once—cost me a reorder fee.
• Forgetting the lithium battery declaration for returns: If you need to send a Jackery unit back to Harbor Freight for warranty, the same form applies. Don't assume the retailer handles it.
• Assuming the EV charger can share a breaker: Most condos require a dedicated 50A breaker for Level 2 chargers. Share it with a washer/dryer and you risk tripping.
• Trusting 'same specs' from different vendors: First Solar's maximum power voltage differs from crystalline silicon modules. Verify system compatibility.

This checklist won't make you an expert overnight—but it'll save you at least one $800 mistake and a lot of headaches. Take it from someone who learned the hard way.