Powerwall Strings & Inverter

A small, single-file web app that reads per-string (MPPT) and inverter data from a Tesla Powerwall‑3 gateway over its local API (TEDAPI) — no cloud, no Tesla account — and charts it in your browser. The data collector and the web page are the same program.

• 📈 Per-string energy, live power/voltage, and an inverter overview (AC output, cooling fan, grid Hz/V)
• 🗓️ Time ranges (3h → All) plus a custom From/to date filter
• 📊 Four charts: string power, string voltage, AC output + fan, grid frequency + voltage
• ⬇️ One-click Excel export of the selected window
• 🔌 Auto-adapts to any number of strings (up to 10 distinct colors)

Screenshots

Strings & Inverter

Requirements

• A Tesla Powerwall (PW2/+/3) gateway you can reach on your network
• Python 3.11+
• Python packages (installed automatically by the launcher): flask, openpyxl, pypowerwall

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1. Get your Gateway password

The app logs in to the gateway's local TEDAPI using the Gateway Wi‑Fi password, which is printed on the gateway's label/QR sticker:

• Powerwall 2 / Powerwall+ (Backup Gateway 2): open the gateway's front cover — the label lists a Wi‑Fi network name and a Password.
• Powerwall 3: the QR/label is behind the cover of the first PW3 (the system controller). If you don't have it recorded, you may need to request it from Tesla.

Some gateways' default password is the last 5 characters of the gateway serial/ID, but the value printed on the label is authoritative — use what's on the sticker.

2. Connect to the gateway (Wi‑Fi adapter)

Your PC must be able to reach the gateway at 192.168.91.1 by joining the gateway's own Wi‑Fi:

1. On the gateway label, find its Wi‑Fi network name:
   • PW2/+: TEG-XXX (XXX = last 3 digits of the gateway serial)
   • PW3: TeslaPW_XXXXXX
2. Connect your PC's Wi‑Fi to that network using the Wi‑Fi password from the label.
3. The gateway is now reachable at 192.168.91.1 (the default TEDAPI_HOST).
4. Set that adapter to auto-reconnect so logging keeps running after Wi‑Fi blips.

The gateway's Wi‑Fi has no internet access. If you need internet at the same time, use a second adapter (Ethernet or a second Wi‑Fi).

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3. Run it (Windows)

1. Install Python 3.11+ from python.org and tick “Add python.exe to PATH”.
2. Unzip this folder anywhere.
3. Open Start_StringsPage.bat in Notepad and set the top lines:

   set "TEDAPI_HOST=192.168.91.1"
   set "TEDAPI_PASSWORD=YOUR_GATEWAY_PASSWORD"
   set "PORT=8800"
   set "INTERVAL=60"

4. Double-click Start_StringsPage.bat. The first run installs dependencies (~1 min, one-time), then starts collecting and opens http://localhost:8800/. Keep the window open; closing it (or Ctrl+C) stops everything.

Sample vs. real data

The included StringsDB.db holds 14 days of synthetic data so the page looks populated out of the box. To view just the sample data without a gateway, run python strings_server.py --no-collect --port 8800. To start logging your data, delete StringsDB.db (it is recreated automatically) and run the launcher.

Files

File	Purpose
strings_server.py	The whole app — collector + web viewer + launcher
Start_StringsPage.bat	Windows launcher (edit host/password/port inside)
requirements.txt	flask + openpyxl + pypowerwall
StringsDB.db	14 days of sample data (replaced by your real data once logging)

Security note

The gateway password is stored in plain text inside Start_StringsPage.bat.