Tenant Access¶

With tenant access you give individual tenants a read-only consumption overview for exactly one meter — straight from the cloud portal. The tenant does not need their own account: they simply sign in with their email address and a one-time code (OTP) and see the meter reading, consumption and costs of their rental unit.

This guide as a PDF

For printing and handing out, this guide is also available as a PDF: Deutsch · English

Screenshots

The screenshots on this page show the German portal interface. The portal is fully available in English — the layout is identical.

The two entry points at a glance¶

Who	URL	Sign-in
Landlord (you)	login.wattwächter.de	Your cloud portal account
Tenant	login.wattwächter.de/tenant-login.html	Email address + 6-digit one-time code (OTP), no account needed

As the landlord you manage access in the cloud portal under Tenant Access. The tenant uses a separate, reduced view (“Consumption Overview”) — they never see your portal, your devices or your settings.

Requirements¶

A WattWächter Plus connected to your portal account via cloud pairing
The booked tenant access add-on package (see below)
For cost figures in the tenant view: an electricity tariff configured for the device (in the portal under device settings → Electricity Tariffs, energy price + standing charge). Without a tariff the tenant only sees kWh values, no € amounts.

Paid add-on package

Tenant access is a paid add-on package and not part of the free cloud portal — from €1.99 per month per device (billed annually, as of August 2026), with the first 3 months free for testing. All details and booking are on the Landlords / B2B page in the shop.

As long as the package is not booked, the Tenant Access entry does not appear in your portal's navigation at all.

Inviting a tenant¶

Step 1: Open Tenant Access¶

In the cloud portal, click Tenant Access in the left-hand navigation:

Step 2: Click “Invite Tenant”¶

Click Invite Tenant in the top right — the invitation dialog opens:

Step 3: Fill in the dialog¶

The fields in detail:

Field	Meaning
Meter	The WattWächter whose values the tenant should see. The dropdown shows the device name and device ID. Only your own devices are listed — devices shared with you are not. The meter cannot be changed later.
Tenant email address	Required. The tenant signs in with this address — the invitation and login codes are sent to it. The address cannot be changed later; if you mistyped it, delete the access and create it again.
Valid from	Start of access, pre-filled with today's date. Backdating is allowed (e.g. if the tenant has already moved in) — the tenant then also sees the values since that date. Future dates are limited to 6 months ahead; before the start date the tenant cannot sign in yet (status “Scheduled”).
Valid until (optional)	End of access, e.g. the move-out date. Leave empty for open-ended access. After the end date the status changes to “Expired” and the tenant can no longer access the data.
Display name (optional)	E.g. “Mustermann family”. Shown in your access list and in the tenant's header. Without a display name the email address is shown instead.
Address (optional)	Street + number, postal code, city, and apartment / floor / extra line. Shown in the tenant's overview and helps you keep track when you manage several units.
Show consumption (import)	Default: on. The tenant sees their consumption in kWh and the resulting electricity cost.
Show feed-in & balance	Default: off. The tenant additionally sees PV feed-in, feed-in revenue and the net balance (cost − revenue). Off by default since feed-in revenue typically belongs to the landlord.

Both checkboxes cleared?

If neither “consumption” nor “feed-in & balance” is checked, the dialog warns: “With this selection the tenant will see no values at all — the page stays empty.”

Step 4: Save¶

Click Save to create the access. The tenant automatically receives an invitation email (subject: “Verbrauchsübersicht für ‹meter name› freigeschaltet”) with a link to the consumption overview on which their email address is already pre-filled.

Limits

Up to 20 active tenant accesses per device — including several accesses for the same email address (e.g. for different meters).

The tenant needs no account and no password — sign-in works with a one-time code (OTP = one-time password) sent by email:

Open the invitation — click “Zur Verbrauchsübersicht” in the invitation email. The login page opens with the email address pre-filled. (Alternatively, open login.wattwächter.de/tenant-login.html at any time and type the email address.)
Click “Request Code” — the tenant receives a 6-digit code by email. The code is valid for 10 minutes.
Enter the code — as soon as all 6 digits are typed (or pasted), the page signs in automatically.
Done — the consumption overview opens. The session stays valid for 6 months; after that, the tenant simply requests a new code.

Good to know:

After 5 wrong entries the code is locked — just request a new one.
A new code can be requested at the earliest 30 seconds after the last one.
A code is only sent if an active access exists for that address. For “Scheduled”, “Expired” or “Deactivated” no email is sent — for privacy reasons the login page never reveals whether an address has access.

What the tenant sees¶

The tenant's consumption overview is a pure read-only view of the shared meter:

Header — tenant/unit, address, access validity and the device ID of the meter, plus a “read access” notice.
Yearly summary — consumption (kWh), electricity cost (€) and average consumption per day, with the year selectable from a dropdown.
Feed-in & balance — only visible if you enabled “Show feed-in & balance”: PV feed-in (kWh), feed-in revenue (€) and the balance (cost − revenue).

Current meter reading — import and, if applicable, export in kWh, live from the device with a timestamp.
Daily profile — hourly curve for a selectable day.

Monthly comparison — bar charts of the monthly values, for one year or all years.

Monthly overview — table with consumption, cost, feed-in and revenue per month, including CSV export (e.g. for the utility bill).

The € amounts are calculated from the electricity tariffs you configured in the portal's device settings. The tenant cannot change anything: no settings, no tariffs, no other devices.

Preview: checking the tenant view¶

The magnifier icon opens the consumption overview exactly as the tenant sees it — including the chosen visibility:

A yellow banner marks it as the owner's preview: “Preview mode (owner view). Tenants see exactly this data.” The preview session is valid for 1 hour and does not affect the tenant's own sign-in.

Managing access¶

The list under Tenant Access shows every access with name, meter, address, validity and status:

Status¶

The colored status badge on the right of each entry shows at a glance whether the access is currently usable:

Status	Meaning
Active	The tenant can sign in and see data.
Scheduled	“Valid from” is in the future — no access yet.
Expired	“Valid until” has passed — no more access.
Deactivated	Manually deactivated by you — no access until you reactivate.

Editing¶

The pencil icon lets you change validity, display name, address and visibility. Only the meter and the email address are fixed — for those, delete the access and create it again.

Deactivating and reactivating¶

The pause icon deactivates an access: the tenant loses access immediately (even an existing session no longer sees data), but the entry stays in the list with all its settings.

A deactivated access can be reactivated at any time with the play icon — the tenant can sign in again right away. Deactivating and reactivating are meant for temporarily blocking the same tenant. They do not help with a tenant change, since the email address is fixed to the access: delete the old access and create a new one for the new tenant's address.

Deleting¶

The trash icon removes the access permanently — including the stored tenant data, e.g. after a tenant has moved out. This cannot be undone; for a temporary block, deactivate instead.

Privacy¶

The tenant has read-only access to the values you shared for exactly one meter — no settings, no device management, no other devices.
Feed-in and balance figures are only visible if you explicitly share them.
When an access expires or is deactivated, data access is blocked immediately — regardless of whether the tenant is still signed in.
Sign-in works without a password, using one-time codes sent to the email address you entered; the login page never reveals which addresses have access.