What are ERE credits?

ERE (Emissiereductie-eenheden) are renewable energy certificates registered at the NEa. Each MWh of home charging earns credits with monetary value. Joulo handles the registration automatically.

What's the difference between AHP and NG models?

Look at the type sticker on your charger: the model number starts with AHP or NG. AHP models have Joulo as a built-in backoffice preset • select it and you're done. NG models always need the Joulo firmware file (.fwi) installed, also when Joulo appears among the Back office presets • that preset only carries the URL. The URL itself comes from the preset, or you enter wss://ocpp.joulo.nl by hand.

The upload fails with 'Couldn't communicate with the device'

The ACE Service Installer lost the link to the charger halfway. Unplug the car and wait until the socket is free • a charger that is charging can refuse the certificate and the OCPP settings. Then restart the charger at the breaker, wait a minute and sign in again: after a failed attempt the charger keeps the old session open and every retry fails the same way. Use a network cable rather than Wi-Fi, and update the ACE Service Installer if it is older than your firmware.

The charger doesn't connect

Check that the ID you registered at Joulo matches the first line top left in the ACE Service Installer exactly, capitals included. That is often the ACE number, but installers just as often set their own (LIB_30129 and the like) • whatever is on that line is the right one. On NG models the joulo_alfen.fwi file must be installed. Picking the Joulo preset is not enough on an NG: the preset carries the URL, not the certificate, so install the file and restart. Did you enter the settings by hand? Then the Back office URL must be exactly wss://ocpp.joulo.nl with Security Profile 0 (default). On AHP models the Joulo backoffice preset must be selected. Restart the charger and wait at least 15 minutes.

I don't see sessions in my dashboard

Alfen pushes the complete history on first connection • this can take 24-48 hours. If the status shows 'Pending', the charger hasn't connected yet.

Do I need a LAN cable?

Not always. For older pre-March 2023 Single models, a physical network/SIM card install is often needed first. Newer models can usually start via temporary WiFi.

Do I need to update firmware?

Usually not. Very old firmware may not support OCPP 1.6 • ask your installer if you experience connection issues.

Does Joulo work with Alfen Eve?

Yes • Alfen Eve models are MID-certified by default, making them directly eligible for ERE. Depending on how your charger was delivered you can connect via Eneco eMobility (cloud API) or directly via OCPP 1.6J to Joulo. Joulo auto-detects which route fits your charger.

All documentation

OCPP

Earn ERE credits with your Alfen charger

Can I connect my Alfen to Joulo for ERE registration? Yes. Alfen Eve models are MID-certified by default and directly eligible for ERE. There are two routes: connect automatically through a cloud provider (50five or Eneco), or connect via OCPP with MyEve and Service Installer.

Careful • already connected to another OCPP backoffice?

Is your charger already configured to an existing OCPP backoffice (for example from your installer, charge-card provider or energy supplier)? Then be careful making changes. A charger usually connects to one backoffice at a time, so switching to Joulo disconnects that link and stops the services relying on it (public charging, expense reimbursement, monitoring). Not sure whether you're allowed to or want to change it? Check with your installer or current provider first.

How ERE credits work with Alfen

Every kWh you charge at home with renewable energy earns you ERE credits. Your Alfen charger's MID meter measures the exact energy usage and sends it to Joulo via OCPP. Joulo registers this at the NEa and you receive your payout • automatically, no paperwork.

Two ways to connect your Alfen

Pick the route that fits you: through your cloud provider, or directly via OCPP. Both deliver the same ERE registration.

Via a cloud provider (50five or Eneco)

Are you with 50five or Eneco? Then connect through that provider. No installer needed.

50five

Connect automatically with your 50five account.

Connect now

Eneco eMobility

Connect automatically with your Eneco account.

Connect now How it works

Via OCPP

Not with 50five or Eneco? Connect directly via OCPP with the ACE Service Installer.

What you need

✓A Joulo account (free registration)
✓The ACE number of your charger (ACE followed by 7 digits, on the type sticker)
✓Service Installer access (ACE)
✓MyEve app and temporary charger network access

First: bring your charger online

How you do this depends on your model's age. You only need one of these two.

Before March 2023: install a network card

These older Alfen Single models usually have no WiFi. Open the charger with Service Installer access and place a network/SIM card so it can get online. This is the most technical part.

From March 2023: temporary WiFi via MyEve

Power-cycle the charger. You then get roughly 15 minutes of WiFi you can join with the MyEve app to bring the charger online.

Read the official MyEve explanation

Step-by-step: connect via local WiFi (March 2023 and later)

1
Activate the charger's WiFi
Switch the charger off at the fuse box (in the meter cupboard) and back on after 20 seconds. The charger now broadcasts a local WiFi signal for 15 minutes.
2
Open the app
Open the MyEve app or the Eve Connect app on your smartphone.
3
Add a device
Tap the + (plus) icon to add a charger and choose to connect wirelessly.
4
Make the connection
Choose to log in manually instead of scanning the QR code (unless you have the password card to hand).
5
Login credentials
Enter your ACE number (the serial number) and the default password from your password card.
6
Select WiFi
Scan for nearby networks and select your own WiFi network. Enter its password to complete the connection.

Then: configure OCPP

First register your charger in the Joulo connect wizard with its ACE number (ACE followed by 7 digits, on the type sticker). Which steps follow depends on your model number • also on the type sticker: it starts with AHP or NG.

Download the Joulo firmware file

Every NG needs this, also when Joulo is already among the Back office presets: that preset only fills in the URL, the certificate is not part of it. It is a security certificate, packaged as a firmware file: you upload it through the firmware screen, but your charger's own software is not replaced. It tells the charger our server can be trusted. Save it on the Windows laptop you'll run the ACE Service Installer from.

Download Joulo firmware file (.fwi)

Download the ACE Service Installer on a Windows PC

The ACE Service Installer runs on Windows only. Install it on a laptop that's on the same network as your Alfen, or that you connect straight to the charger with a network cable. The MyEve app can't do this. Unplug the car before you start: a charger that is charging can refuse the certificate and the OCPP settings.

Download ACE Service Installer (Windows)

Sign in to the ACE Service Installer

Use these credentials. These are the installer's well-known defaults, not anything personal to you.

UsernameRadomskiR

PasswordfazUv6

Pick your charger and sign in with the owner password

Select your own charger from the list and sign in with your charger's owner password. Your charger appears top left, next to its icon: the first line is the ID you register with Joulo. Is a firmware update offered? Run it right away • older firmware is missing the settings you need next. You received the owner password with the charger. Lost it? Ask your installer or reset it with Alfen's password recovery code. Joulo does not have this password.

Install the firmware file (General tab)

Go to General → Upload Firmware, pick the joulo_alfen.fwi file you downloaded and confirm the upload. The charger confirms the file is loaded • sometimes after a brief restart. Do this step even when Joulo is already among the Back office presets: without the certificate the charger cannot trust our server, and the connection fails. No car on the charger, or the upload stops with 'Couldn't communicate with the device'.

Look for Joulo under Back office (Connectivity tab)

Click the Connectivity icon at the top, open the General tab and open the dropdown under Back office. One NG firmware carries a ready-made joulo preset, the next one doesn't. Is joulo there? Pick it • the preset fills in the URL and the OCPP settings itself, and you skip the next step. Is joulo missing? That happens just as often • you then enter the settings yourself in the next step. No Protocol or Security Profile fields on this tab? That is how it should look: they only appear once you enter the settings by hand.

Back officejoulo (preset)

No joulo in the listnext step

ACE Service Installer with the Backoffice preset list open on the Connectivity tab and 'joulo' selected — Connectivity → General in ACE Service Installer: select 'joulo' under Backoffice preset. Your list has no joulo? Then pick 'Manually enter backoffice settings' in the next step.

No joulo in the list? Enter the URL yourself (Connectivity tab)

Skip this step if you picked the joulo preset. Go back to Connectivity → General and choose 'Manually enter backoffice settings' under Back office. Open Network Profile 1 and change Priority from Not used to 1 • only then do the OCPP fields appear. Set Protocol to OCPP 1.6 (JSON) and Security Profile to 0. Enter the URL below • nothing after it, your charger appends its own object number.

Back officeManually enter…

Network Profile 1 · Priority1

ProtocolOCPP 1.6 (JSON)

Security Profile0 (default)

Back office URLwss://ocpp.joulo.nl

Save and restart

Click Save, then click the Power icon at the bottom left of the screen and confirm the restart. The charger restarts and connects to Joulo within a few minutes.

Supported models

Check the exact model and MID meter status before connecting.

15 models

Model	Type	MID meter	Status
Eve Double (alle)	AC	Ja	Compatible
Eve Double Plus	AC	Ja	Compatible
Eve Double Pro Line	AC	Ja	Compatible
Eve Double Pro-line	AC	Ja	Compatible
EVE Mini (ICU)	AC	Ja	Compatible
Eve Single	AC	Ja	Compatible
Eve Single Plus	AC	Ja	Compatible
Eve Single Pro-line	AC	Ja	Compatible
Eve Single S Pro	AC	Ja	Compatible
Eve Single S-line	AC	Ja	Compatible
ICU Compact	AC	Ja	Compatible
NGU	AC	Ja	Compatible
Twin	AC	Ja	Compatible
Twin 5	AC	Ja	Compatible
Twin 5 Plus	AC	Ja	Compatible

FAQ

Need help installing your Alfen Single Pro?

Get a free callback and we walk you through it, or let Joulo come on-site for EUR 150 installation help.

Get a callback Installation help EUR 150

Ready to connect your Alfen?

Start the connection wizard and choose 50five, Eneco or OCPP.

Connect charger