Free NEC 220.83 calculator. Enter your service size + major electric loads
+ the charger you want — get an instant verdict and ranked options if
your panel can’t handle it as-is. Includes the NEC 220.87 metered
alternative and NEC 750 load-management credit.
The calculator above worked out what your panel can carry. This works out what that means at the shop — including the cases where the honest answer is “nothing yet”.
Buy a 48A charger — 11.5 kW
That is roughly 35 miles of range per hour, assuming 3 miles per kWh — your car’s real efficiency moves that number in both directions.
What’s setting that number: The chargers themselves
Your panel and your car could both take more, but nothing in this guide delivers above 50A, so 48A is the practical ceiling for a wall-mounted home unit.
A handful of EVs can accept 80A AC (19.2 kW): the Lucid Air and Gravity, the GMC Hummer EV above its base trim, some Silverado EV, Sierra EV and Escalade IQ versions, 2022–2023 F-150 Lightning Extended Range trucks, and GM EVs fitted with GM's optional 19.2 kW onboard charger. Using it takes an 80A charger on a 100A circuit, which is a separate conversation to have with your electrician; it is not something this guide covers.
One input still missing
You have not told us which EV you drive, so we cannot check its onboard AC limit — the amperage above assumes the charger and the panel are the only limits. Pick your car under "Your EV" on the left. Many cap at 48A, but some take 32A or less (the base Tesla Model 3 and Model Y take 32A, for example), and that changes this recommendation.
Before you buy anything
Whatever you end up buying, the circuit is not a DIY job. Take these numbers to a licensed electrician: they size the breaker and the conductors, pull the permit, and confirm what your panel will actually pass inspection with. This is a starting point for that conversation, not a substitute for it — and permits and local amendments vary by jurisdiction.
A new circuit, a breaker and a hardwired connection are licensed-electrician work, and in most jurisdictions a permit and an inspection as well. Nothing on this page is a spec you should hand to a DIY install.
Grizzl-E Ultimate 48A
Our pick
Why this one at 48A: 48A is this unit's native hardwired rating, so nothing is being dialled down. It is UL certified plus ENERGY STAR, in a cast-aluminium UL Type 4 enclosure that suits a garage, a driveway or a very cold or hot climate, and its Wi-Fi app is optional: it charges with no connection.
What to order: The Amazon listing is the hardwired J1772 version. Have your electrician confirm its DIP switches are at the 48A setting (switch 1 off, 2 on, 3 on, 4 on) for a 60A circuit, per United Chargers' installation manual.
Certification
UL certified (UL file E510712) + ENERGY STAR; UL Type 4 cast-aluminum enclosure
Affiliate link. As an Amazon Associate, The Charge Port earns from qualifying purchases, at no extra cost to you. No brand pays for placement, so commission plays no part in this pick.
Autel MaxiCharger AC Lite Home
Alternative
Why this one at 48A: Also hardwired and rated for this: a 50A unit whose installation manual has the electrician set a rotary switch to 48A for a 60A breaker. It is CSA certified to UL 2594 plus ENERGY STAR, in a NEMA 4X enclosure, and adds Wi-Fi, Bluetooth, Ethernet and RFID start. The right call over the Grizzl-E if you want the fuller app.
What to order: This link is the 50A hardwired J1772 version. Your electrician sets its rotary current switch to 48A for a 60A breaker, per Autel's installation manual. Autel sells a hardwired NACS version as a separate listing (it is in the ranked list).
Certification
CSA certified (to UL 2594, per Autel's spec sheet) + ENERGY STAR; NEMA 4X / IP65 enclosure
Amperage
Up to 50A hardwired (current selector from 16A) / 40A on a NEMA 14-50 plug
Affiliate link. As an Amazon Associate, The Charge Port earns from qualifying purchases, at no extra cost to you. No brand pays for placement, so commission plays no part in this pick.
Picks here turn on three published things: the certification line on the unit, whether it is rated or documented-adjustable for the exact amperage your circuit and car support, and whether it installs the way you are installing. No brand pays for placement, so commission plays no part in the order.
Hardwired to a new 240V circuit — what else you need
We only link a specific product once it passes our quality check on Amazon, and none of the accessories for this path does yet. The install gear guide covers what to look for.
Safety rules that apply to this path
Hardwiring sidesteps the GFCI headache — Hardwired chargers are exempt from the receptacle GFCI requirement, so they avoid nuisance tripping while staying code-compliant. For a permanent install you don't plan to unplug, hardwiring (via an electrician) is the cleaner path — see our charger guide for which units hardwire.
Know the DIY line — Plug-in gear — smart splitters, NEMA adapters, energy monitors, cable holsters — is homeowner-friendly. Anything involving a NEW circuit, a breaker, hardwiring, or the inside of your panel needs a licensed electrician and usually a permit. Don't freelance 240V wiring.
Prices are the maker's own store price on the date given (never an Amazon price, which changes constantly and which Amazon's Associates terms do not let us quote). A charger with no maker price on file shows none. Click through for the current Amazon price.
Fewer than 4 fastened appliances → 100% (no reduction)
3.903.90220.53
EV charger (48A @ 240V)
Nameplate at 100% (125% is for circuit sizing, not demand calc)
11.5211.52625.42
220.83(A) demand factor (first 8 kVA at 100%, remainder at 40%)
25.9 kVA connected → 15.2 kVA demand
25.9215.17220.83(A)
Total calculated demand15.17
Service capacity (200A × 240V)48.00
Headroom remaining+32.83
Important: This calculator provides an estimate based on NEC 220.83 / 220.87 methodology and the inputs you provided. It is for informational purposes only and is not a substitute for a load calculation performed by a licensed electrician or for inspection by your local Authority Having Jurisdiction (AHJ). Actual code compliance, permit issuance, and safe installation require evaluation by qualified professionals. We make no warranty regarding the accuracy of results for your specific installation. Do not perform electrical work yourself unless qualified and licensed to do so.
How this calculator works
The National Electrical Code (NEC) governs whether your existing service
can legally support a new EV charger circuit. Two methods exist:
NEC 220.83 — the standard "paper calculation."
Sums all your loads (lighting, appliances, HVAC, EV charger) and
applies a demand factor: first 8 kVA at 100%, remainder at 40%.
This is what most electricians use.
NEC 220.87 — the "actual usage" alternative. Uses
12 months of metered demand data from your utility bill instead of
the paper calc. Many older homes that fail 220.83 on paper pass
220.87 easily because they’re vastly over-paneled but rarely
peak high in real life.
Both methods compare the calculated demand to your service capacity
(service amps × 240V). If the demand is under capacity, you can add
the EVSE. The calculator shows which method it used and the line-by-line
breakdown — expand "Show the math" above to see every NEC citation.
Load management vs panel upgrade vs service upgrade
If your calc says you’re over the limit, you have three escape paths:
Option
Cost
When it works
Load-management EVSE / device (NEC 750)
A plug-in smart splitter: From $399 on NeoCharge's own store, 2026-10-04. More for a hardwired controller.
Almost always — keeps existing panel
Smaller charger (drop from 48A to 32A)
$0 extra
If about 22 miles of range per hour of charging (32A, the median EV on sale) covers your overnight needs
Panel / service upgrade to 200A
$1,500–$3,000 (Qmerit 2026)
If the panel or service is genuinely at capacity
Utility-side work (drop, meter or transformer)
Quoted by your utility; no published national figure
Last resort — when service drop itself is undersized
Most homeowners flagged as "OVER LIMIT" on paper can avoid an upgrade.
Check the recommendations panel in the calculator — a load-management
device or smart splitter often solves the problem at a fraction of the cost.
Recommended Level 2 EV chargers by amperage
Of the 120 model-year trims in our onboard-charger data,
89 top out at 48A (11.5 kW) or less. Only these can use more,
on some or all trims: Chevrolet Equinox EV, Cadillac Lyriq, Cadillac Optiq, Cadillac Vistiq, Chevrolet Silverado EV, GMC Sierra EV, GMC Hummer EV, Cadillac Escalade IQ, Cadillac Escalade IQL, Ford F-150 Lightning, Lucid Air, Lucid Gravity, Volvo EX60, BMW iX3, BMW i3, Porsche Cayenne Electric. For everything else, 48A
is the ceiling — fastest practical charging on standard #6 AWG wire
and a 60A breaker. Our charger
matcher shows the figure for your exact car.
Tier
Chargers we rank
Why
Up to 40A
Grizzl-E Classic
About 27 miles of range per charging hour at 40A (median EV on sale)
48–50A
Autel MaxiCharger AC Lite Home, Emporia Classic Level 2, ChargePoint Home Flex, Grizzl-E Ultimate 48A, Wallbox Pulsar Plus
About 33 miles per hour at 48A, if your car's onboard charger accepts 11.5 kW
Qmerit's 2026 installation data puts Level 2 charging hardware at $300–$900. Above 48A only a few
vehicles benefit, and we don't currently rank a charger in that tier; see our
home charger guide for the full list.
When to use the NEC 220.87 alternative
The 220.87 path is the most under-used feature of the NEC for
homeowners. Use it when your 220.83 paper calc fails but you suspect
your real-world peak is much lower. Common scenarios:
Older 100A or 150A homes with on-paper "all-electric" loads but rarely all running together
Homes with hot tubs that get used occasionally rather than daily
Homes that have switched some loads from electric to gas (or vice versa) without updating the panel
To use it: pull your last 12 utility bills, find the highest single-month
peak demand reading (your utility may also provide a "max demand" value
on request), then switch to "Pro mode" in the calculator above and
enter the peak. The calc multiplies it by 1.25 (NEC 220.87 safety
factor) and adds your new EVSE — that’s your real demand.
Frequently asked questions
Do I need a permit to install an EV charger?
Yes, in nearly all US jurisdictions. Adding a new dedicated 240V
branch circuit requires a building permit and electrical inspection.
Permit costs $75–$500. Some municipalities have streamlined "EV charger"
permits with same-day approval. Skipping the permit can void homeowner’s
insurance and create disclosure issues when you sell.
What size breaker do I need for a 48A charger?
A 60A breaker. Per NEC 625.42, EVSE is a continuous load requiring 125%
of rated current for breaker/wire sizing. 48A × 1.25 = 60A. Use #6 AWG
copper. (The 125% rule does NOT apply a second time in the demand
calc — common confusion.)
Will installing an EV charger raise my insurance?
Usually no, when installed by a licensed electrician with a permit
and inspection. Some insurers ask whether the charger is hardwired
or plug-in (NEMA 14-50). Unpermitted DIY work can void coverage
in the event of an electrical fire.
Can I DIY my EV charger install?
Legally: depends on your jurisdiction. Practically: even simple
installs require pulling permits, sizing wire correctly, and passing
inspection. Most homeowners save $200-500 by DIY-ing but expose
themselves to insurance and resale risks. Hire a licensed electrician
unless you genuinely know NEC code.
How accurate is this calculator?
The math implements NEC 220.83 / 220.87 / 625.42 / 750 verbatim
and is unit-tested against worked examples from Mike Holt’s NEC
training materials. Default appliance loads come from manufacturer
spec sheets. The result is a preliminary calculation suitable for
initial planning — your local AHJ may interpret some sections
differently. Always verify with a licensed electrician before
committing to install work.
What about solar panels and EV chargers together?
Solar adds a separate concern: NEC 705.12’s 120% busbar rule. A
200A panel can accept up to 40A of solar backfeed (200 × 1.2 - 200 = 40).
If your solar inverter exceeds that, adding an EVSE breaker may
require panel changes regardless of the demand calc. Toggle "Solar PV
installed" in Pro mode for the busbar check.