How to set up Wattion

Get your FoxESS battery and Ohme EV charger working together in four steps. Perfect for Octopus Intelligent and fixed-price charging plans.

What you need

FoxESS inverter (API key from FoxESS Cloud) and an Ohme EV charger (Ohme app login). No extra hardware.

FoxESS hybrid inverter with cloud API

Ohme EV charger (Home Pro or similar)

Octopus Intelligent or similar tariff (optional but recommended)

Step 1

Create your account

Step 2

Connect your devices

In Settings, add your FoxESS API key, Ohme charger email/password, and optional Axle VPP API key. We use these to monitor your battery and control charging.

Where to get these

FoxESS API key

From foxesscloud.com: log in, open User Profile (hover over your avatar), then API Management. Click Generate API key and paste it into the API key field in Settings.

Ohme password

Use the same password you use to log into the Ohme app. If you sign in with a social account (e.g. Google), set a password first: in the Ohme app go to Settings → Add a password, then use that password here.

Axle VPP API key (optional)

From Axle Home Assistant integration docs: generate your Home Assistant token, then paste it into the Axle VPP field in Settings to enable export-event awareness.

Open Settings

Step 3

Set your default schedule

Configure when your battery can charge and discharge on the Schedule page. This is used when your EV is not charging.

Open Schedule

Step 4

Check your dashboard

View live status, savings, and history. The battery manager runs every 10 minutes to keep your schedule in sync.

Go to Dashboard

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