Charging
Know what charging actually costs
Real rates, real numbers
Most charging trackers estimate. Custom Shop looks up your actual utility's published tariff — including time-of-use windows — so an overnight charge is priced at the overnight rate and a session that crosses a boundary is split correctly at the boundary.
- Utility rates by ZIP code from NREL's Utility Rate Database, with the tariff windows your utility actually publishes.
- A charger map with live station data from Open Charge Map and the U.S. Department of Energy's station locator.
- A Wall Connector monitor that reads a Gen 3 unit on your own local network — live power, voltage, current, and session energy. Read-only: nothing in the app can start, stop, or schedule a charge.
- Cost history with CSV export, calculated in exact decimal arithmetic rather than floating point, because these figures get reconciled against a bill.
Built for the tax-time export
Charging costs frequently end up in a business expense claim or a tax return, so the export is treated as a document rather than a convenience: money is computed in exact decimal throughout, timestamps carry seconds, session boundaries are priced at the true boundary, and the CSV is escaped so a tariff name containing a comma cannot corrupt a row.
Questions owners ask
Can I see what charging my Tesla actually costs?
Yes. Custom Shop looks up your utility's published rate schedule by ZIP code, including time-of-use windows, and prices each session against the real tariff — splitting a session correctly when it crosses a rate boundary.
Can I monitor my Tesla Wall Connector from my phone?
Yes, for a Gen 3 Wall Connector on the same local network. The app reads live power, voltage, current, and session energy directly from the unit. It is read-only and cannot start, stop, or schedule a charge, and nothing leaves your network.
Can I export my charging costs for taxes?
Yes. Cost history exports as a CSV with exact decimal money values, per-session detail, and timestamps to the second.