Connect your charger via OCPP
Your charger doesn't work with one of our cloud integrations? No problem. Via the open OCPP protocol you can connect virtually any professional charger to Joulo.
OCPP / Universal
Open protocol • any brand
// the process
Connect in three steps
After registration you receive a unique WebSocket URL. Configure it in your charger and Joulo automatically receives your charging data.
Register with Joulo
Create a free account and add your charger via OCPP. You'll receive a unique WebSocket URL and security key.
AccountConfigure your charger
Enter the WebSocket URL and security secret in your charger's OCPP settings. This varies per brand • we guide you step by step.
ConnectStart earning
Once your charger is connected, Joulo automatically reads your sessions and credits ERE to your account.
EarnWorks with 50+ brands
Nearly every charger with OCPP 1.6 is supported. Below is a selection of compatible brands.
// technology
Open protocol, securely connected
OCPP is an open standard managed by the Open Charge Alliance. Joulo implements OCPP 1.6J with enterprise-grade security.
Open standard
OCPP is an open protocol managed by the Open Charge Alliance. No vendor lock-in, no proprietary APIs.
SHA-256 security
Each charger gets a unique 20-digit security secret. The gateway validates it via SHA-256, transmitted over wss://.
Dedicated CSMS
Joulo's OCPP gateway runs on dedicated infrastructure with SQLite-backed outbox for reliable data sync.
Realtime sessions
Charging sessions are tracked live via MeterValues. Start, stop and energy consumption • all automatic.
Custom Charge Point ID
Use the default Joulo ID or enter your own existing Charge Point ID. Convenient if your charger is already configured.
Connection monitoring
Joulo automatically detects connection errors and shows the status in your dashboard, so you can resolve issues instantly.
What can you earn via OCPP?
Calculate your net earnings after 20% Joulo service fee.
Your situation
per year
≈ 3.000 kWh kWh home charging per year (based on 20 kWh/100 km)
Your estimated earnings
Our latest sale (July 2026) returned €0.129 net per kWh.
Not a forecast: this is the price we actually got. That was €0.161 gross per kWh; after our service fee €0.129 net remains. The scenarios above show what a higher or lower market price would do.
See every saleNet per year (after Joulo fee)
per month
ERE's
kg CO₂
Official NEa formula
ERE = kWh × renewable fraction × fossil reference × conversion factor ÷ 1,000
Indicative calculation • actual earnings depend on ERE market price and agreements NEa
// benefits
Why OCPP users choose Joulo
20% service fee
Other providers charge 22.5–27.5%. With Joulo you always keep more. Referral discounts available.
Any brand welcome
Via OCPP you connect brands that other providers don't support. No vendor lock-in.
Transparent dashboard
Track your charging sessions, ERE credits and payouts in real time.
Compliant & on the NEa list
Joulo B.V. is on the official NEa list of registered ERE providers (inboekdienstverleners) and is built according to the RED III framework.
Related pages
Joulo for developers
Overview of all tools, APIs and integrations.
OCPP API
OCPP WebSocket integration and configuration.
Home Assistant
Sensors, lovelace and automations via the REST API.
Platform status
Realtime status of all Joulo services.
Developer Docs
Quickstart, authentication, guides and REST API reference.
status.joulo.nl
Realtime status of all Joulo services.
Ready to get started?
Create a free account and connect your charger. Find your API token directly in the dashboard.