You can install up to three Zaptec Go charging stations in a single setup. They’ll communicate via the cloud and share power among the units. Works on TN or IT grids, with both 1-phase and 3-phase connections.
Before you start
- Maximum 3 charging stations per home installation.
- Zaptec Go has built-in earth fault protection (RDC-DD 6mA DC, IEC 62955).
- Protect each charging station with a max 40A Type A 30mA RCD circuit breaker (NEK 722.531.2.3.101).
- All circuit breakers in a multi-install must have the same rating.
- Do not daisy-chain units together.
- Zaptec Go charging stations in a multi-install communicate via the cloud for seamless operation.
Why the circuit breakers must match
In a multi-install, the Zaptec Portal (cloud system) treats all Zaptec Go charging stations as if they're on one circuit. The total available current is then split between them.
Example:
- 32A limit, two Zaptec Go: Each gets 16A when both are in use. If only one is in use, it can get the full 32A.
- 16A limit, three Zaptec Go: If all three are in use, the third car will wait in the queue until one of the other sessions finishes. This is because the minimum current to start charging is 6A.
- Charging three cars at once: You need at least 18A available, and each charging station must be protected by at least a 20A circuit breaker.
Even if each charging station has its own 32A circuit breaker, the Zaptec Portal (cloud system) still limits a home installation to 32A total.
To give each charging station the full circuit breaker capacity at the same time, the site must have enough supply for 32A per charging station, and each must be registered as a separate installation. This will disable the load balancing.
TN grid multi-installations
You can use 1-phase or 3-phase connections. Each charging station must have its own Type A fuse with integrated earth fault protection.
TN 3-phase / 3-phase connections
- One circuit breaker per charging station (same rating for all).
- On TN 3-phase installation with 3-phase connections, load balancing is achieved by distributing 32A across three circuits.
- Set phase rotation in the Zaptec App, to match incoming phases L1, L2, and L3 for better load distribution during 1-phase charging.
TN 3-phase / 1-phase connections
- One circuit breaker per charging station.
- Wire each Zaptec Go to a separate phase (L1, L2, L3).
TN 1-phase / 1-phase connections
- One circuit breaker per Zaptec Go.
- In a TN 1-phase system, all charging stations are connected to the same phase, so there's no need to phase rotation in this setup.
IT grid multi-installations
Same rules as TN. You can install Zaptec Go charging stations using either 1-phase or 3-phase connections. But on IT 1-phase, power is more limited, so load balancing is essential. Each charger requires its own Type A fuse with integrated earth fault protection.
IT 3-phase / 3-phase connections
- One circuit breaker per charging station (same rating for all).
- Wire terminal 1 on each charging station to a different phase (L1, L2, L3).
- Set phase rotation in the Zaptec App.
IT 3-phase / 1-phase connections
- One circuit breaker per charging station (same rating for all).
- Wire terminal 1 on each charging station to a different phase (L1, L2, L3).
- Set phase rotation in the Zaptec App.
IT 1-phase / 1-phase connections
- One circuit breaker per charging station.
- All charging stations are on the same phase.
- No phase rotation needed, so expect limited simultaneous charging.
- Wire terminal 1 on each charging station to a different phase (L1, L2, L3).
If you're using external load balancing
If you have an external load balancing unit measuring the total house load, it will send the available per-phase current to the entire installation. The charging station will then split that available current equally. This works the same whether you have one, two, or three chargers.
🇬🇧 UK requirements:
An external PEN fault detection device may be required. Typically, this would be required for chargers used for outdoor charging when connected to a PME supply. One appropriately rated device can be used to supply multiple circuits on the same installation.
One exception to this is when connecting Zaptec UK Go 7kW to a single-phase PME supply. In this case, the built-in PME fault detection meets the requirements of BS 7671:2018 Amendment 1:2020 clause 722.411.4.1 (iv).
Updated