How to Install a Level 2 Charger in Your Garage: A Practical Checklist (Sunnova Owner’s Guide)

Who This Checklist Is For

If you just bought an EV and need a Level 2 charger installed in your garage fast — or you’re a Sunnova customer who wants to pair your solar battery with home charging — I wrote this for you. I’ve coordinated dozens of rush installations for solar + EV setups over the past four years, and I’ve seen what works and what causes delays.

This checklist covers 7 steps, from electrical prep to app configuration. It’s built for the moment when time is tight (e.g., your EV arrives in 48 hours) and you can’t afford mistakes. Full disclaimer: I’m not a licensed electrician — always hire a certified pro for the actual wiring. But I can tell you how to manage the process like an insider.

Step 1: Check Your Garage’s Electrical Capacity

Most Level 2 chargers need a 240V circuit and draw 30–50 amps. Your first move is to check your breaker panel. What I look for: at least two open slots (for a double-pole breaker) and enough remaining capacity. For homes with a Sunnova solar battery system, I also verify the battery’s inverter can handle the extra load — sometimes you need a load management device.

Real talk: I once assumed a panel had room, showed up with the charger, and discovered the main breaker was undersized. That cost us a day and an $800 emergency electrician visit. To avoid that, send a photo of your panel to your installer before they arrive.

Step 2: Choose the Right Charger Location

Most people mount the charger inside the garage, near the garage door, so the cable can reach the car’s charge port. I prefer a spot that’s 3–5 feet from the floor and within 2 feet of an existing wire path. One tip: if you have a double garage, put the charger on the side where your EV’s port is (driver or passenger — check your manual).

Honestly, I’m not sure why some EVs put the port on the front and others on the back. My best guess is it’s a design trade-off. But measure twice!

Step 3: Gather Tools & Materials

Here’s what I usually have on-site for a clean installation:

• Level 2 charger unit (e.g., Sunnova-recommended models or your own)
• Double-pole 240V breaker (matching your panel brand)
• 6-gauge or 8-gauge THHN wire (depending on amperage)
• Conduit (if required by local code)
• Mounting bracket & screws
• Voltage tester
• Wire strippers, screwdrivers, drill

Pro tip: Buy the wire in one continuous length — splicing in the wall is a pain and may fail inspection. If you’re on a tight timeline, get everything delivered in advance. Our company lost a $12,000 contract once because we tried to save $40 on standard delivery and the wire arrived two days late. That’s when we implemented our “48-hour buffer” policy for rush jobs.

Step 4: Mount the Charger & Run Conduit

Start by marking the mounting holes, drilling pilot holes, and securing the bracket. Then run conduit from the panel to the charger location. The order matters: mount first, then measure conduit length. I’ve seen people cut conduit too short because they measured before mounting — then they had to buy a coupling (waste of time).

If this is a rush job (e.g., you need the charger working by tomorrow morning), I’d suggest having the electrician pre-cut and label wires based on a photo walkthrough. We did that for a client in March 2024, 36 hours before their EV delivery, and shaved 2 hours off the install.

Step 5: Wire the Circuit & Connect the Charger

This is the part where you absolutely need a licensed electrician. They’ll turn off the main breaker, install the 240V breaker, run the wires, and terminate them at the charger. They’ll also verify polarity and ground continuity.

While they work, I usually log into my Sunnova solar login on the Sunnova website to check the solar battery’s status. Some chargers can be integrated with Sunnova’s energy management system — you can schedule charging during peak solar production. More on that in Step 7.

Step 6: Test the Charger

Before buttoning up, test with a vehicle or a load tester. Plug in, verify the charging light sequence, and check that the breaker doesn’t trip. If your charger has Wi‑Fi, connect it to your home network so you can monitor via the app.

Common mistake: not testing after re-energizing the panel. I’ve seen a loose neutral cause intermittent failures — caught it because we tested for 10 minutes of continuous charging.

Step 7: Configure Your Sunnova App & Schedule Charging

If you’re a Sunnova customer, open the Sunnova website or app. You’ll see your solar production, battery charge level, and home consumption. Most Level 2 chargers can be set to charge only when solar is abundant — that’s where the real savings are.

Here’s the part I have mixed feelings about: rush installation premiums. On one hand, they feel like a cash grab. On the other, I’ve seen the chaos that happens when a standard 2‑week install slips to 3 weeks — the client misses their rebate window or can’t commute. I now believe paying extra for guaranteed turnaround is often worth it. For example, we paid $400 extra for a rush electrical crew in November 2024 to install a charger before a client’s utility rebate expired. The rebate was $1,500. The $400 fee paid for itself.

Things to Watch Out For

• Permits & inspections: Most jurisdictions require an electrical permit. A rush job without a permit can backfire if your insurance denies a claim. Check with your city — some offer same-day permits online.
• Battery compatibility: If you have an older Sunnova battery (e.g., LG Chem RESU), confirm it can handle the charger’s surge current. Our internal data from 200+ installations shows about 15% of older batteries needed a software update.
• Warranty: Keep the charger’s receipt and installation invoice. Sunnova’s website has a section for warranty documents under your account.

I’m not 100% sure every step applies to your setup, but if you follow this checklist, you’ll avoid the biggest time sinks. And if you absolutely need it done by tomorrow, call a certified installer and be prepared to pay for guaranteed service — the cost of missing your deadline is almost always higher.