Challenge
A homeowner in Brazil needed daily EV charging at a private residence. The priorities were simple but non-negotiable: enough power to recharge overnight without an oversized DC connection, domestic-grade electrical safety, no risk of tripping the household main breaker, and phone-based control that a non-technical user would actually adopt.
A basic plug-in cable was too slow; a floor-mounted DC cabinet was oversized for the garage. The answer had to be a compact wallbox with smart safety, not a commercial charging terminal.
Max Power Solution
ACQ 7kW single-gun, wall-mounted
- 7kW / 32A single-phase — practical home tier; ~7kWh per hour, enough for typical daily residential top-up without DC-grade supply works.
- Type-B RCD — residual-current protection for AC and pulsating DC components, appropriate for a domestic EV charger where mixed AC/DC leakage paths are possible.
- DLB (Dynamic Load Balancing) — continuously monitors household demand (HVAC, cooker, water heater) and reduces charger current when total load approaches the main rating; restores full 7kW when headroom returns.
- Tuya control board + Bluetooth — app start/stop, current limit, scheduled charging and session view; Bluetooth provides local control without depending on cloud connectivity.
- IP54 enclosure — dust/water protection for garage or covered parking-wall installation; ACQ chassis supports wall/column mount and 7–22kW family upgrades.
Results
- Safe overnight charging — Type-B RCD plus DLB removed overload anxiety on a shared residential supply.
- Owner-self-service — Tuya/Bluetooth app replaced call-center scheduling with one-tap start, limits and reports.
- Right-sized capex — 7kW wallbox avoided DC cabinet, cooling and grid upgrade costs while covering daily home miles.
- Upgrade path — same ACQ platform can move to 11/22kW if the household electrical service and future EVs require it.
Takeaways for Residential Buyers
- 7kW single-gun is the home sweet spot for most daily-driving households.
- Type-B RCD > Type-A for domestic DC-capable vehicles unless local code prescribes otherwise.
- DLB is what makes higher-power home AC safe on an existing panel.
- App/Bluetooth control drives adoption — the charger must feel like a smart-home device.
➡️ Commercial counterpart: [Russia Restaurant — ACP 7kW Dual-Gun]
➡️ OCPP and smart-load strategy: [OCPP 1.6J vs 2.0.1 Buyer’s Guide]
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