First EV, first home charging setup, and I don't know where to start
Picked up my first EV two weeks ago (a used Bolt, new to me) and I'm now the proud owner of a driveway extension cord setup that is very obviously not going to cut it long term. House is a 1970s split-level in upstate NY, garage is detached about 40 feet from the panel. I have genuinely no idea where to start with this.
I called two electricians so far just to get a read on what they'd even be looking at, and both asked me things I couldn't answer off the top of my head - what size is my main panel, how much room is left on it, is there existing 240V anywhere on that side of the house. I dug around and found a sticker inside the panel door that says 100A, which from what I've read online is on the smaller side for a house that also has central air and an electric water heater.
So before I go further I want to actually understand what I'm deciding between. Do I need to upgrade to a bigger panel or can 100A actually work with the right circuit? Is hardwiring actually meaningfully better than a plug-in unit, or is that mostly a preference thing? And realistically, is this a DIY-adjacent project for someone reasonably handy, or is this 100% licensed-electrician territory no matter what? Trying to get a sense of what I'm actually paying for before either of these guys quotes me a number and I have nothing to compare it to.
Filed under: General EV Talk
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13 answers
13 ANSWERS
@kmoore79August 20, 2026
100A can work, but it depends entirely on what else is on that panel, and I wouldn't trust an eyeball guess on that. What your electrician should be doing is a proper load calculation — the code section covering this if you want to check it yourself — that adds up your existing loads against the panel's rating and tells you the real headroom instead of a guess. Central air and an electric water heater eat into that fast. Sometimes there's more room than people expect once the numbers are actually run, sometimes there isn't. I wouldn't commit to a panel upgrade until someone's done that math for your house specifically. WenStorm has a beginner-friendly walkthrough of this whole decision that covers the load-calc step along with the rest of it.
That's helpful, thank you. Neither of the two guys who came out mentioned doing an actual load calculation, they kind of eyeballed the panel and said it 'should be fine' - now I'm wondering if I should ask for that explicitly or just find someone who does it as standard practice.
Ask for it explicitly, and honestly if someone won't write it down for you that's a small red flag. I'm still an apprentice so I'm not the one signing off on these, but every job I've been on with my journeyman, the load calc is one of the first things we do on-site, not something we skip because the panel looks like it has room. It takes maybe fifteen minutes if they know your house's existing circuits. If a company can't be bothered to spend fifteen minutes before quoting you a panel upgrade you might not need, I'd get a third opinion.
@quietwalrusAugust 31, 2026
Ask both electricians directly whether they're pulling a permit for this. A charging circuit installed without one can bite you later - insurance claims, home sale inspections, that kind of thing. It's not expensive or slow in most towns, just a phone call and an inspection, but plenty of guys skip it if you don't ask. And going in, know that a licensed electrician has to be the one running new circuit wire and touching your panel regardless of how handy you are - that part isn't really optional in most jurisdictions.
@graycoilAugust 22, 2026
I'm also upstate NY, similar vintage house. Mine ended up needing a subpanel run out to the garage rather than a full service upgrade, which kept the cost a lot more reasonable than I was bracing for - somewhere in the 1,800 to 2,200 range all in for the run, the charger, and labor, versus the quotes I got for a full 200A service upgrade which were closer to 4,000-5,000. Ask specifically whether your situation needs the whole panel replaced or just a dedicated circuit added, because those are very different price categories and not every 100A panel needs the full upgrade.
@marblepigeonAugust 20, 2026
I'm at almost the exact same decision point right now, just a year behind you probably. I keep going back and forth on whether to DIY the parts I'm actually allowed to touch - mounting the charger, maybe running conduit - and let an electrician handle the panel and final connection, versus just handing the whole project to someone. Has anyone actually split a job like that? Trying to figure out if that saves real money or just creates more coordination hassle than it's worth.
Did the split job. Saved maybe 15% on labor. Not nothing but not huge either. If your time has any value, factor that in before assuming it's a clear win.
@driftglass_kAugust 26, 2026
Once you're through the install decision, worth thinking about amperage too, not just hardwire vs plug-in. I've logged every session since I got my charger and the jump from a 32A to a 48A circuit only shaved about 20 minutes off a typical overnight top-up for me, because I was already finishing well before morning either way. If your panel has limited headroom, it might not be worth fighting for the higher amperage just because it's technically available - a smaller circuit that fits comfortably in your existing panel could get you basically the same real-world result.
@kmoore79August 21, 2026
Worth saying plainly since a couple people upthread are estimating panel costs: get actual numbers for your specific panel and utility area before budgeting off anyone else's quote in this thread, upstate NY or not. Panel brand matters (some are effectively obsolete and cost more to add breakers to), your utility's service drop capacity matters, and local permit/inspection fees vary by town. The load calc conversation above is the right first step - everything downstream of that, including whether you need a subpanel, a full panel swap, or nothing at all, depends on what that calc actually says for your house.
A couple of clarifications on the code side since this thread's covering a lot of ground. Hardwiring versus a plug-in unit is largely a preference and reliability question, not a code requirement either way - most jurisdictions allow both as long as the plug-in unit uses a rated receptacle installed to code. Where hardwiring has a real edge is that there's one less connection point to loosen or corrode over years of use, which matters more for an outdoor or unconditioned-garage install than an indoor one. On the panel question: NEC does not set a blanket minimum panel size for EV charging, so the '200A is the standard now' framing you'll see online is a market observation, not a code requirement - your 100A panel can absolutely support a charging circuit if the load calculation clears it. I'd trust whichever electrician actually documents that calculation for you over pattern-matching your case to typical modern panel sizes.
@frostholmAugust 20, 2026
Sixth year doing this here. If I could go back, I'd have hardwired instead of plug-in from the start - mine's in an unheated detached garage and I've had to snug the plug connection twice over the years, never anything dangerous but enough to notice. Not a dealbreaker either way, just relaying what actually held up long-term versus what looked easier on install day.
@lampthreadAugust 20, 2026
New to this forum and also pretty new to actually cold winters, so reading this thread with interest. Did anyone here have to factor temperature into the hardwire-vs-plug-in decision, or is that more of an outdoor-vs-indoor question than a climate one? My charger's going to be in an attached garage but it's not insulated.
@copperfogSeptember 04, 2026
This thread answered more than I expected. Going back to both electricians and specifically asking for the load calculation in writing before I decide anything about panel size - sounds like that's the actual first domino here, not the charger brand or the plug type. Appreciate everyone weighing in, this was the piece I didn't know I was missing.
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