Frequently asked questions.
Everything you need to know about the MX7, V2G, installation, and the Humax Charge app.
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About V2G / V2H / V2L
What are V2G, V2H, and V2L?
- V2G (Vehicle to Grid): Sends energy from the EV battery back to the grid to reduce electricity costs or generate revenue.
- V2H (Vehicle to Home): Uses EV battery power to supply a home's electricity (useful during outages or peak-rate hours).
- V2L (Vehicle to Load): Powers devices and equipment directly from the vehicle (camping, construction sites, emergency backup, etc.).
Can I use V2G/V2H with MX7?
Currently, these functions are not commercially supported.
AC-based V2G/V2H requires both the vehicle (including its onboard charger) and the charger to be approved by the DNO (Distribution Network Operator), such as through G99/G100 certification.
MX7 hardware supports ISO 15118 communication, but the software and certification process are still in progress. Commercial availability will be announced once ready.
What equipment is needed for V2G/V2H?
- Standard Type 2 cable
- Vehicle and charger that support bidirectional power flow and ISO 15118
- DNO approval and enrolments in an eligible tariff
- Some features may require a software subscription
Can MX7 provide home backup power during outages (V2H)?
Not at present. Future support may be possible through certified accessories, depending on UK regulations and grid approval.
What are the requirements for V2G?
Vehicle manufacturer support, enrolment in a relevant tariff, and in some cases a software subscription.
How much can I save with V2G/V2H?
It depends on your installation, tariff, and usage patterns. High-energy households (e.g., 2 EVs + solar PV + heat pump) have reported savings of up to £200/month, but this will vary depending on installation, tariff, and usage patterns.
Compatibility & smart features
Is MX7 compatible with Octopus Energy tariffs?
- Intelligent Tariff: Integration in progress, support coming soon
- Agile Tariff: Not officially supported yet, under technical review
What is Intelligent Charging?
- Vehicle identification: Automatically adjusts charging to the vehicle's battery size
- Tariff management: Prioritizes charging during off-peak hours to save money
- Example: Plug in at 7 pm → minimal charging during peak rates → full charging from 11 pm onward
Can Intelligent Charging work without SOC (State of Charge) data?
Yes. It works with or without SOC data. If SOC is available, the charger can automatically detect the battery level without setting a target.
Can MX7 integrate with solar PV?
Yes. It prioritizes home energy needs first, then directs surplus solar power to EV charging.
EV Night Tariff & Solar/Battery
The MX7 charger does not support selecting between grid and battery power, nor blocking battery usage during EV charging. Auto Solar mode uses excess solar energy, based on CT clamp measurements. Even during EV night-time tariff periods, battery power may still be used depending on the home inverter and energy system configuration, and this is normal operation.
Installation
What are the charge and discharge speeds?
- Up to 7 kW AC charging
- Discharge speed depends on vehicle capabilities and V2X certification
How is the CT clamp connected?
- Directly to the charger (can be extended via Cat6 cable)
- Usually works without an Eastron meter
- Additional metering may be required for special installations
Do I need a separate power supply line for installation?
Most existing supply lines can be used. CT must be installed near the charger. Wireless CT is not supported.
What safety features does MX7 have?
- Temperature sensor (overheat protection)
- Tamper Protect Switch (prevents unauthorized opening)
- Overcurrent, earth leakage, and surge protection
What does a standard installation include?
A standard installation typically includes:
- Mounting the charger on a suitable wall or permanent structure
- Up to the specified cable length (depending on the selected installation pack)
- Installation and testing of required electrical protections
- Additional consumer unit or RCBO enclosure if required
- Electrical testing, certification, and commissioning
- App registration and a basic user demonstration
- Labour and travel costs from the installer's base
What is not included in a standard installation?
The following are not included and may require a separate quotation:
- Civil or ground works (trenches, ducts, channels)
- Masonry, painting, or plumbing work
- Electrical upgrades to non-compliant or outdated installations
- New electricity supply or meter registration
- Any refurbishment or construction work
What about 22kW or three-phase installations?
22kW chargers require a three-phase electricity supply. These installations are subject to bespoke quotations.
How long does installation take?
Estimated installation times:
- Up to 10 m cable pack: approx. 4 hours
- Up to 15 m cable pack: approx. 5 hours
- Up to 25 m cable pack: approx. 6 hours
Actual times may vary depending on site conditions.
Can I install the charger myself?
No. EV chargers must be installed by a qualified electrician in accordance with BS7671 and the Code of Practice for EV Charging Equipment Installation. Self-installation is not permitted and may invalidate the warranty.
App & user interface
What can the MX7 app do?
- Start/stop charging remotely
- Monitor real-time status, history, usage, and cost
- Set custom charging schedules
- Authorize or block users
- Authenticate via RFID card
Can I use MX7 alongside another charger?
Yes, but charging speed may be reduced when used simultaneously. Check with a qualified installer before setup.
What do the MX7 LED indicators mean? (Firmware v1.1)
LED brightness and On/Off can be adjusted in the Humax Charge app or Installer app.
Charging & usage
How long does it take to charge an electric vehicle?
Charging time depends on the charger power, vehicle, and battery size.
- Level 1 (standard socket): Several hours or more
- Level 2 (home chargers, including Humax ECORD): Typically 4–8 hours
- DC fast charging: Around 80% charge in approximately 30 minutes (vehicle dependent)
Humax ECORD chargers support Level 2 AC charging.
How do I start charging immediately?
You can start charging in two ways:
- Plug & Charge: Plug the cable into your vehicle to start charging automatically
- RFID Card: Swipe the RFID card on the charger to start or stop charging
A yellow pulse indicates a successful RFID swipe.
Can I lock my charger to prevent unauthorised use?
Yes. Humax smart chargers allow access control via the app, including locking/unlocking the charger and monitoring usage.
What is Smart Charging?
Smart Charging allows your charger to optimise charging based on factors such as electricity tariffs, time of day, and user preferences. This helps reduce charging costs, balance grid demand, and support the use of renewable energy.
How does the tariff feature work?
The tariff feature allows you to enter your electricity tariff details. Charging will only start during off-peak periods, based on your settings. You must also set a "ready time" to indicate when your vehicle needs to be charged by.
Connectivity
How do I connect my charger to Wi-Fi?
Use the Humax app to select your Wi-Fi network and enter the password. Once connected, you can monitor and control the charger remotely.
My charger is offline. What should I do?
- Power the charger off for at least 10 seconds
- Power it back on and allow up to 5–6 minutes to reconnect
- If the issue persists, contact customer support for assistance
What should I do if I cannot find the charger hotspot?
The charger hotspot is only available for 15 minutes after power-up. To access it:
- Power the charger off
- Power it back on
- Look for a hotspot starting with the charger serial number
If the hotspot still does not appear, please contact support.
What if I forget my PIN code?
The PIN code is printed on the last page of the user manual. If unavailable, contact support with your charger serial number to request a reset.
Property & permissions
Can I install a charger in a rental property?
If you are not the property owner, you must obtain landlord permission before installation. Additional permissions may be required for listed buildings or conservation areas.
What type of connector is used in the UK?
Most EVs in the UK use the Type 2 (Mennekes) connector, which is standard across the UK and Europe for AC charging. Humax ECORD chargers are compatible with Type 2 vehicles.
What is the difference between tethered and untethered chargers?
- Tethered charger: Comes with a fixed charging cable attached
- Untethered charger: Has a socket only; you use your own charging cable
Both options provide the same charging performance.
Still got a question?
Email us at sales@mabeltrading.com — we aim to reply within 1 business day.
