Equalizer
Load Management
§14a EnWG
PV Surplus
Equalizer Installation &
Load Shedding under §14a EnWG
Installation options by main fuse size, §14a compliance, control levels and compatible components – all in one article.
⚠ Important: Connection to smart meter (HAN/P1) is currently not possible in Germany. Use Modbus meters or CT clamps instead.
◎Ch. 1Product Selection
◈Ch. 2Components
⚡Ch. 3§14a EnWG
▤Ch. 4Comparison
?Ch. 5FAQ
01
Which solution is the right fit?
Selection by main fuse size and requirement
💡
Three factors decideThe right solution depends on the main fuse size, the number of charging stations, and the §14a obligation. The interactive tool below helps with the decision.
Decision guide – which solution do you need?
Select main fuse value
What is the main fuse rating of the installation?
Solutions · under 100 A
Equalizer AMP or Modbus energy meter
Both options work. The Equalizer AMP measures via CT clamps directly on the phases – no separate meter needed. A compatible Modbus meter is installed as an alternative between the main distribution board and the Equalizer.
- Dynamic load management ✓
- PV surplus charging ✓
- §14a compliant with AMP ✓
Solution · 100–250 A
CVM E3 Mini with Modbus + external current transformers
Simple CT clamps are not sufficient at this main fuse size. Required: Micro Matic CVM E3 Mini + 3× Split-Core CTs (Wibeee STP-24) + Modbus adapter.
- Split-Core CTs mandatory
- Components must be sourced individually
- §14a compliant ✓
Solution · over 250 A
Janitza UMG 604 Pro + Rogowski coils
For this power class, the Janitza UMG 604 Pro in combination with Rogowski coils is required. Industry standard for large commercial and industrial installations.
- Rogowski coils instead of CT clamps
- Modbus communication with Equalizer
- §14a compliant ✓
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All options at a glance
Up to 100 A · Option 1
Equalizer AMP
CT clamps directly on phases – no separate meter
- §14a EnWG compliant
- 4 configurable control levels
- PV surplus charging
- Dynamic load management
- Standby mode: charging station remains reachable
Up to 100 A · Alternative
Modbus energy meter
Separate meter installation with Modbus connection
- Compatible meter required (list in article)
- Install between main distribution board and Equalizer
- Dynamic load management
- PV surplus charging
100–250 A
CVM E3 Mini
Modbus measuring device with external Split-Core CTs
- Micro Matic CVM E3 Mini
- 3× Wibeee STP-24 Split-Core CTs
- Cabcon E02-QPMBC Modbus adapter
- 24V DC power supply required
Over 250 A
Janitza UMG 604 Pro
Industrial meter with Rogowski coils
- Industry standard for large installations
- Rogowski coils instead of CT clamps
- Modbus communication
- §14a compliant
⚠
HAN/P1 not available in GermanyDirect connection to the smart meter via HAN/P1 is currently not possible in Germany due to missing standardisation. Modbus meters or CT clamps are the available alternatives.
02
Required components
Complete lists for CVM E3 Mini and Equalizer AMP
CVM E3 Mini – component list
4 components · 100–250 A
1
Micro Matic CVM E3 Mini
Required
Compact measuring device with Modbus interface. DIN-rail mount, direct communication with the Easee Equalizer.
2
Cabcon E02-QPMBC
Required
Connection cable with Modbus adapter for the link between CVM E3 Mini and Equalizer.
3
24V DC power supply
Required
Either RS Components 230V AC → 24V DC or Meanwell HDR-15-24 DIN-rail power supply. Powers the CVM E3 Mini.
4
3× Wibeee STP-24 Split-Core CTs
3× Required
Split current transformers for all three phases. Product datasheet available from Easee Support. Split-Core allows installation without cutting cables.
Equalizer AMP – what is needed?
Up to 100 A · Simplest solution
1
Easee Equalizer AMP
Required
Measurement module with integrated CT connections. Connected directly to the phases of the main distribution board.
2
CT clamps (included)
Included
Included in the Equalizer AMP delivery. Attached to L1, L2, L3 and measure current flow in real time.
3
Ripple control receiver / FNN control box
§14a only
Provided and supplied by the grid operator. Only required for §14a obligation. Connected to the Equalizer AMP via potential-free contact.
4
24V DC power supply (for FNN control box)
§14a only
A 24V DC power supply is typically required to power the FNN control box – e.g. a DIN-rail PSU (Meanwell HDR-15-24 or similar). Not always included in the control box delivery.
📶
Wi-Fi on site is mandatory for §14aThe Easee Equalizer must be connected to the cloud via Wi-Fi for §14a load shedding to work. Without an active Wi-Fi connection, no §14a load shedding is possible – neither via ripple control receiver nor via API. Check Wi-Fi availability and signal strength at the installation point before starting work.
📄
Datasheet Wibeee STP-24The product datasheet for the Wibeee STP-24 Split-Core CTs is available for download in the Easee support articles. Contact support for the direct download link.
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Control levels of the Equalizer AMP
Configurable load levels for §14a and manual load management
4 control levels – Equalizer AMP
Each level freely configurable · potential-free contact
S0
No charging – complete load shed. Charging station remains active in standby and is digitally reachable.
S1
Heavily throttled – minimum charging (approx. 4.2 kW per §14a EnWG). Vehicle remains connected with minimum power.
S2
Moderately throttled – freely configurable. Typical for peak load reduction during elevated grid load.
S3
Full charging power – no active signal from grid operator. Normal operation.
💡
Control levels freely configurableThe percentage values for levels S0–S2 are freely configurable and should be set in coordination with the grid operator. The example value of 40% for S1 corresponds to the §14a minimum value of 4.2 kW at full load.
03
§14a EnWG – Load shedding
What is mandatory, what does it mean, and how is it implemented?
⚠
Mandatory since 1 January 2024All newly installed controllable consumption devices (wallboxes, heat pumps) must be §14a compliant. Subsidy programmes such as KfW require §14a compliance.
📶
Wi-Fi connection is a mandatory requirementFor §14a load shedding, the Equalizer must be connected to the Easee Cloud via Wi-Fi. Without an active internet connection, no load shedding is possible – neither via ripple control receiver nor via API. Ensure Wi-Fi availability at the installation point before starting work.
What is §14a EnWG?
Grid operator may throttle
The Energy Industry Act allows grid operators to temporarily reduce controllable consumption devices to a minimum of 4.2 kW during grid overload. Wallboxes must technically enable this control.
Benefits for operators
Lower grid connection costs
In return for controllability, operators receive reduced grid usage fees – depending on the grid operator and tariff, this can result in significant cost savings.
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Two implementation paths
Option 1 · Hardware
Ripple control receiver / FNN control box
Signal via potential-free contact
- Provided and supplied by the grid operator
- Potential-free contact to Equalizer AMP
- 24V DC power supply for control box required
- 4 configurable control levels (0%, 40%, 70%, 100%)
- Charging station remains active & reachable in standby
- Accepted by all grid operators
Option 2 · Digital
Load shedding via API
Digital control by the energy supplier
- Real-time communication via Easee API
- Start, pause or throttle charging
- Particularly dynamic and flexible
- Not accepted by all grid operators
- Prior coordination with grid operator required
—
Compatible devices for §14a
| Device | §14a compliant | Max. main fuse | PV surplus |
|---|---|---|---|
| Equalizer AMP | ✓ Yes | up to 100 A | ✓ Yes |
| CVM E3 Mini | ✓ Yes | 100–250 A | ◑ Limited |
| Janitza UMG 604 Pro | ✓ Yes | over 250 A | ◑ Limited |
| Standard Equalizer (without AMP) | ✗ No | — | ✓ Yes |
⚠
Configuration may require supportDepending on the setup, assistance from the Easee support team may be required to configure the §14a system. Contact the grid operator in advance to agree on the preferred control method (ripple control receiver or API).
04
Comparison of all options
All installation options at a glance
| Solution | Main fuse | §14a | PV surplus | HAN/P1 | Effort |
|---|---|---|---|---|---|
| Equalizer AMP + CT clamps | up to 100 A | ✓ | ✓ | ✗ DE | Low |
| Equalizer + Modbus meter | up to 100 A | ◑ per meter | ✓ | ✗ DE | Medium |
| CVM E3 Mini + Split-Core CTs | 100–250 A | ✓ | ◑ | ✗ | High |
| Janitza UMG 604 Pro | over 250 A | ✓ | ◑ | ✗ | High |
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Summary
under 100 A
Equalizer AMP with CT clamps – simplest solution, directly §14a compliant, PV-capable, no additional components needed.
100 – 250 A
CVM E3 Mini with Modbus + 3× Wibeee STP-24 Split-Core CTs + Cabcon adapter + 24V power supply – components must be sourced individually.
over 250 A
Janitza UMG 604 Pro with Rogowski coils – industry standard for large commercial and industrial installations.
HAN/P1 DE
Not available in Germany. Direct smart meter connection is currently not standardised – use Modbus meters or CT clamps instead.
§14a obligation
Mandatory since 1.1.2024 for all new installations. Equalizer AMP is the preferred solution. Contact the grid operator in advance (ripple control receiver or API).
FNN control box
Provided by the grid operator. An additional 24V DC power supply is required for the control box power supply.
Wi-Fi required
Wi-Fi on site is mandatory. Without an active internet connection, no §14a load shedding is possible – neither via ripple control receiver nor via API.
05
Frequently asked questions
Is the Equalizer AMP absolutely required?
For §14a compliance with main fuses under 100 A, the Equalizer AMP is the simplest and recommended solution. Compatible Modbus meters also work as an alternative. For §14a without AMP, coordination with Easee Support is required.
What happens to the charging station during a load shed?
The charging station is throttled to the configured control level or paused completely. Importantly, the charging station remains active in standby mode and is still digitally reachable – for firmware updates, status queries and app control. Once the signal is lifted, the vehicle resumes charging automatically.
Does PV surplus charging work together with §14a?
Yes, both can be combined with the Equalizer AMP. The Equalizer dynamically regulates charging power based on available PV surplus and simultaneously responds to §14a control signals. During §14a load shedding, the grid operator signal takes priority.
How many control levels can the Equalizer AMP manage?
4 control levels (S0–S3). The levels are freely configurable – e.g.: S0 = 0% (no charging), S1 = 40% (approx. 4.2 kW), S2 = 70%, S3 = 100% (full charge). Configuration is done in coordination with the grid operator.
Are there subsidies for §14a-compliant wallboxes?
Yes. Many subsidy programmes (KfW, federal states) have required §14a compliance since 2024/2025. The Easee Equalizer AMP makes the charging station eligible for subsidies. Additionally, operators receive reduced grid usage fees due to controllability. Check KfW and state subsidies in advance on the respective websites.
Ripple control receiver or FNN control box – what's the difference?
The ripple control receiver is an older but widely used technology for grid operator control. The FNN control box is a more modern alternative. Both are connected to the Equalizer AMP via a potential-free contact. Which variant the grid operator uses should be clarified in advance.
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