WattChoosing a Level 2 charger
I'm not going to hand you a ranked top ten of chargers I've never installed. Here's the criteria that actually separate them, and honest notes on the one I own.
Why there's no numbered ranking here
Charger rankings are the most affiliate-corrupted content in this category, and almost all of them are written by people who own zero of the units listed. The specs below genuinely determine which charger suits you, and no ranking can know your panel capacity, your inverter brand, or whether you park outside in February. Use the criteria.
The specs that actually matter
| Spec | What to look for | Why |
|---|---|---|
| Amperage | Match your car, not the max | A 48A unit is wasted on a 32A onboard charger |
| Adjustable current | Down to 16A or lower | Essential for generator and surplus charging |
| Hardwired vs plug | Plug for flexibility | A 14-50 plug lets you move it or feed from a generator |
| Listing | UL or ETL | Insurance and inspectors both care |
| Outdoor rating | NEMA 4 or better | Not optional in a real winter |
| Load management | CT clamp support | Prevents nuisance trips on a small service |
| Local control | API, MQTT, or open protocol | Cloud services get discontinued; wiring doesn't |
| Cable length | 20–25 ft | The most common regret is a short cable |
Match the charger to your situation
Grid-tied, no solar
Almost any listed, adjustable Level 2 unit will do. Buy on cable length, outdoor rating, and whether you can control it without a vendor account. Don't overpay for smart features you'll configure once and never open again.
Solar, wanting surplus charging
Two viable routes. Ecosystem-native chargers talk directly to a specific inverter platform — simplest to commission, but it locks you to that vendor for the life of the system. Monitor-paired setups add an energy monitor with CT clamps on your service and let the charger throttle to match surplus, at lower cost and with less lock-in.
Ask one question before buying: if this company stops supporting the app, does the hardware still work? The answer sorts the field quickly.
Off-grid or outage-resilient
The charger is the easy part; the inverter is the constraint. You need adjustable current down low so charging can shrink to whatever your system can spare, and you need the ability to stop cleanly when storage runs down. Full off-grid guide →
You want to own the stack
OpenEVSE is open hardware and firmware — an AVR charging controller with an ESP32 gateway that publishes state over MQTT and accepts live solar and grid figures to adjust its pilot current for surplus-only charging. Pair it with evcc, an open-source charge controller and home energy management system built to run locally without cloud dependence, supporting a long list of chargers, inverters and vehicles. If you already run Home Assistant, this is the path with no vendor who can switch you off.
Tesla Universal Wall Connector
✓ Owned, part of my charging build
48A, works with both NACS and J1772 vehicles, and integrates natively with Tesla vehicles and Powerwall for charge-on-solar behaviour. The tradeoff is the obvious one: deepest features inside one ecosystem, less useful outside it.
Check priceBefore you buy anything: confirm your electrical panel can carry the circuit. A 48A charger needs a 60A breaker and the spare capacity to back it. On an older 100A service that often means load management or a service upgrade, and the upgrade can cost more than the charger. Get that answered first.