Buy the ChargePoint Home Flex. On a 100-amp service the winning feature is not speed, it is the ability to be set to exactly the amperage your load calculation leaves spare - and the Home Flex is selectable across the widest useful range while still being a plug-in unit you can put on a modest circuit. If you want that plus whole-home monitoring, the Emporia. If the calculation says there is genuinely nothing spare, the Wallbox Pulsar Plus with Power Boost throttles itself against the rest of the house in real time. If you would rather set the amps once with a dial and never think about it, the Grizzl-E Classic. And if you want to add no circuit at all, the EVDANCE 24-amp unit runs from the dryer outlet you already have.
Our guide on whether a charger fits a 100-amp panel answers the yes-or-no question and explains the load calculation. This page is the other half: once you know how many amps are spare, which charger do you actually buy? The ranking here is not about features. It is about how far down each unit goes, and what it needs from the house to get there.
The number that decides everything
EV charging is a continuous load under NEC Article 625, which means the circuit must be sized at 125 percent of the charger's draw - or, read the other way, the charger may draw no more than 80 percent of its breaker. That gives the ladder every tight-panel decision runs down:
| Breaker | Max continuous draw | Power at 240V | Rough range added per hour |
|---|
| 60A | 48A | 11.5 kW | About 40 miles |
| 50A | 40A | 9.6 kW | About 33 miles |
| 40A | 32A | 7.7 kW | About 27 miles |
| 30A (existing dryer circuit) | 24A | 5.8 kW | About 20 miles |
| 20A | 16A | 3.8 kW | About 13 miles |
Range figures assume roughly 3.5 miles per kilowatt-hour, which is a reasonable mid-point for a modern EV in mild weather - your car and your winter will move it. The point of the table is the shape of the curve: going from 48 amps to 24 amps does not halve your charging in any way you will notice overnight. Twenty miles an hour over a ten-hour window is two hundred miles, which is far more than the average US driver covers in a day.
What we ranked on
- How low it goes. The minimum setting matters more than the maximum. A unit that only does 40 amps is useless if your load calculation says 24.
- How the setting is made. A hardware dial set at install cannot be accidentally changed; an app setting can be adjusted later without an electrician. Both are defensible; they suit different owners.
- Whether it can load-manage. A charger that measures whole-home draw and backs off can be sized above what a static calculation would allow.
- Whether it needs a new circuit at all. The cheapest answer to a tight panel is often to use a circuit that already exists.
- Safety listing. UL or ETL to UL 2594, as on every page here.
The three strategies, in the order we would try them
1. Dial the charger down
Simplest, cheapest and the right answer in most 100-amp houses. The electrician runs the calculation, finds you can spare a 40-amp circuit, and the charger is set to 32 amps and forgotten. No extra hardware, no monitoring, nothing to fail. Every pick on this page except the EVDANCE can do this; what differs is how low and how the setting is made.
2. Load management
If the calculation says there is nothing meaningful spare, a charger that watches the rest of the house can still be fitted - it throttles when the dryer and the oven are both running and returns to full speed when they stop. Wallbox calls this Power Boost and it works from a meter clamp on the main feed; Emporia's PowerSmart does the equivalent through its whole-home energy monitor. This buys real capacity but it adds a device and a dependency. Best load-balancing chargers ranks that hardware specifically.
3. Use a circuit you already have
A 240-volt dryer outlet is a 30-amp circuit, which is 24 amps continuous - about 20 miles of range per hour. If the laundry is anywhere near the car, a 24-amp charger with a NEMA 14-30 plug adds no load to the panel at all, because it uses capacity the calculation already accounted for. The caveat is obvious and important: you cannot run the dryer and the car at the same time unless you fit a listed splitter. See the dryer-outlet guide and best NEMA 14-30 chargers.
Only after all three have failed does a service upgrade make sense - and it is a real expense. A smart panel is sometimes the cheaper route; smart panels vs a panel upgrade compares them honestly.
How the five compare
| Charger | Range of settings | Set how? | Load management? | Needs a new circuit? |
|---|
| ChargePoint Home Flex | Selectable up to 50A | At setup, in the app | No | Yes (14-50 or hardwired) |
| Emporia Level 2 | Adjustable, up to 48A hardwired | In the app | Yes, with its energy monitor | Yes |
| Wallbox Pulsar Plus | Up to 48A hardwired | App | Yes - Power Boost from a meter | Yes |
| Grizzl-E Classic | 40 / 32 / 24 / 16A | Internal dial at install | No | Yes (14-50) |
| EVDANCE 24A (14-30) | 24A ceiling | On the unit | No | No - uses a dryer outlet |
So, which one?
ChargePoint Home Flex as the default: set it to whatever the calculation allows, plug it into a 14-50, and raise it later if you ever upgrade the service. Emporia if you want the same flexibility plus a view of the whole house. Wallbox Pulsar Plus when the calculation genuinely leaves nothing and dynamic throttling is the only way in. Grizzl-E Classic if you want the amperage set in hardware and no app in the loop. EVDANCE 24A if the dryer outlet is near the car and you would rather spend nothing on electrical work.
