Products / EVSE-SC-01
Edge Load Balancer
First-generation site controller. Measures the main connection with three CT clamps and dynamically limits up to 4 Edge charge controllers over Modbus so the site never exceeds its main fuse. WiFi to the EdgeTech platform and the MyCharger app.
- Part number
EVSE-SC-01- Status
- Shipped
- Made in
- Europe
- Price
- € 145 excl. VAT · per unit excl. VAT, ask for a quote above 5 units
- CE
- EU declaration of conformity (PDF)
Specifications
| Specification | Value |
|---|---|
| Charge points | Up to 4 EVSE-C-3x32A on one RS485 bus |
| Site measurement | 3 CT clamps on inputs C1, C2, C3: the household (mains) current per phase, up to 40 A per phase; CTs for higher currents on request |
| Modbus kWh meter | On request: EVSE-SC-01 with a DIN-rail Modbus kWh meter instead of the CT clamps, on the same Modbus cable as the charge controllers (for example where clamps don't fit in the cabinet) |
| Current transformers | 3 split-core CTs included; 23 × 40 × 26 mm (lid 14 mm), conductor opening 9 mm, 40 cm lead |
| Load balancing | Per-second current limit per charge point, site limit configurable up to the main fuse, minimum 6 A per car, start threshold 8 A |
| Fieldbus | Modbus RTU master, RS485, 9600 8N1 |
| Bus cable | 3 × 0.75 mm² multi-core (stranded). No solid-core cable and no raw Ethernet cable in the terminals; Ethernet only with RJ45 connectors (adapter board on request) |
| Connectivity | WiFi IEEE 802.11 b/g/n, 2.4 GHz only; MQTT over TLS with a per-device pre-shared key |
| Module | WiFi module (2.4 GHz) |
| Supply | 90–300 V AC, 50 Hz, 300 mA / 3 W, powered from the distribution board |
| Dimensions | 90 × 54 × 58 mm, DIN-rail enclosure (3 modules) |
| Enclosure rating | IP00, Class I; install inside the distribution board behind a fuse |
| CE | EU declaration of conformity, site controller (2022-001): LVD, EMC, RoHS, EN 301 489-1/-17, EN 300 328, EN 62311 |
| Made in | Europe |
Interfaces: Modbus RTU RS485 master, WiFi 2.4 GHz, 3× CT clamp input (3 CTs included)
Standards: Modbus RTU, EN 300 328, EN 301 489. Status of each on the standards page.
What it is
A DIN-rail module for the distribution board that watches the main connection with three current clamps, supplied with it, and tells each charge controller, every second, how much current it may draw. Four charge points on a 3×25 A connection can all be plugged in; the load balancer splits what is left after the house or building has taken its share.
The module connects over WiFi to the EdgeTech platform, which gives users the MyCharger app (start/stop, off-peak charging, consumption overview, automatic invoicing) and gives installers remote diagnostics and firmware updates.
Load-balancing behaviour
- Reads the three clamps continuously and computes the available headroom per phase against the configured site limit.
- Writes a new maximum current to each charge controller once per second. If a controller does not hear from the site controller for 2 s it drops to its safe limit.
- Never lets a car go below 6 A (the IEC 61851 minimum); a car is only started when at least 8 A is available. If more cars are plugged in than can be served at 6 A, the last ones wait.
- Optional site-wide 1-phase mode for small connections.
Details and the configuration keys: Load balancing.
Limits
- The included clamps measure up to 40 A per phase; for a larger connection, ask for CTs for higher currents. Where clamps don’t fit, a version with a Modbus kWh meter instead of the clamps is available on request. Above 3×63 A, use the SC-02 with a P1 meter or the GridShield controller with a kWh meter.
- WiFi is 2.4 GHz only. Sites with poor WiFi coverage in the metering cabinet need a repeater or an access point nearby.
- Maximum 4 charge controllers. For more, use the SC-02 (up to 10).
Installation: the installation manual for the EVSE-SC-01 (PDF), step by step with figures.
Installation
CAD and drawings
For fit and installation only, not for manufacture. Outline, mounting holes, connector positions and component height envelopes; dimensions marked ≈ are estimated.
Questions
Should I buy the SC-01 or the SC-02?
SC-02 if the site has a DSMR/ESMR 5 smart meter with a free P1 port; it needs no clamps and sees export as well as import, so solar charging works properly. SC-01 if there is no P1 port, or the main connection is above 3×63 A.
Can it use a kWh meter instead of the CT clamps?
On request. We supply the EVSE-SC-01 with a DIN-rail Modbus kWh meter instead of the clamps, wired on the same Modbus cable as the charge controllers; useful where clamps don't fit in the cabinet. It is not a standard variant: ask us.
Does it work with solar panels?
Partly. The CT clamps measure magnitude reliably but the direction of current under PV export is not always detected correctly, so surplus-solar charging is unreliable on the SC-01. Use the SC-02 for solar sites.