WATTNEXUS MVP Household · Smarter energy decisions, powered by your data
DRY RUN Read-only
Private household energy-intelligence MVP

Household energy command centre

Read-only insight layer for Powerwall, solar, vehicle charging, Octopus tariff data, carbon intensity, weather context, and source quality.

Missing gap closed Energy-flow view added for solar, home, battery, grid, and EV.
Missing gap closed Import/export metering and SmartFlex planning are now configurable.
Safety position Still read-only. No Powerwall, EV, charger, or dispatch command is sent.
Benchmark direction Mature energy-app automation depth without copying another interface or enabling control.
Time range Day view active
Day

Live energy flow model

Preview data

This gives the dashboard the missing Powerwall-style system view while staying honest about the data foundation.

S Solar 5.4 kWp estimate
H Home Consumption pending
B Powerwall SOC requires Tesla data
G Grid Import/export pending
E EV Charging source planned
Solar generation 5.4 kWp PVGIS estimate configured. Live generation awaits telemetry.
Home consumption 0 kWh Canonical 30-minute intervals available once live sources are collected.
Vehicle consumption Planned Tesla vehicle and charger data are configured in Settings.
Powerwall state of charge Read-only Fleet API token and energy site ID required for live SOC.
Grid import/export Pending Octopus import/export intervals need live collection and reconciliation.
Net cost/credit Pending Billing cycle starts on day 28.

Tariff status

Octopus

Intelligent Octopus Go selected for recommendations.

Carbon intensity

NESO

Run the NESO collector for live forecast. AB15 is configured as the outward postcode area.

Weather and solar forecast

PVGIS

Forecast uses the configured solar size and estimate mode.

Next 24-hour forecast timeline

Cost · carbon · solar
00
03
06
09
12
15
18
21

Static preview only. Live version should layer Octopus price windows, NESO carbon forecast, solar forecast, and device availability.

Freshness and data quality

Foundation
Foundation Ready For Live Collection
Canonical intervals

Ready for live data

Tesla and Octopus overlap

Blocked until both sources collect common half-hour periods

Reconciliation

No private data is exposed on this public page

Insights

What the data will explain

Cost, carbon, flexibility, solar export value, and device readiness stay separate until the data is reconciled.

Cost signals

Tariff and billing settings drive recommendation labels.

Carbon signals

NESO forecast data will show cleaner half-hours for flexible loads.

Solar export opportunity

Solar estimates sync from Settings.

Data confidence

Recommendations stay preview-only until source freshness and reconciliation are acceptable.

Competitive maturity matrix

Critical reassessment
Energy-flow dashboard Added

Needed to match the mental model users expect from Tesla and Powerwall-focused apps.

Automation rules Preview only

Advanced rule concepts are useful, but WattNexus keeps control disabled until safety gates are approved.

Device health and diagnostics Planned

Powerwall pairing, token health, source freshness, and stale telemetry alerts need backend support.

Cost, carbon, and export optimisation Foundation

The product should optimise against cost, carbon, comfort, reserve, export value, and data confidence.

Privacy and data governance Priority

This remains a WattNexus differentiator: no public MPANs, meter serials, exact coordinates, bills, or tokens.

What is still missing from the real MVP

Next build
True live telemetry

Tesla access-token refresh, energy-site discovery, and Powerwall 3 state history.

Billing truth

Octopus import/export, tariff, standing charge, export revenue, and bill reconciliation.

Forecast confidence

Met Office, PVGIS, NESO, and source-age scoring shown per recommendation.

Audit trail

Recommended action, reason, confidence, rejected alternatives, and user approval outcome.

Automation

Automation

Recommendation-only scheduling. No Powerwall, vehicle, or charger control is implemented.

Automations are recommendation-only in this MVP. DRY RUN remains active.

Scheduled automations

DRY RUN
05:31
Default Group

Every day at 05:31: recommend backup reserve 20%, low-cost import check, and tariff-aware battery plan.

Preview
23:30
Default Group

Every day at 23:30: recommend overnight charging window using tariff assumptions and carbon forecast freshness.

DRY RUN
Solar
Paused automations

Solar export protection is paused until export metering and live source freshness are reconciled. Solar estimate configured.

Paused
Devices

Energy source readiness

Device states reflect Settings choices. Identifiers and household data are not stored on this public page.

Source coverage

Data architecture
Tesla

Operational Powerwall, solar, site, and vehicle telemetry.

Octopus

Meter truth, import/export intervals, billing, tariffs, and SmartFlex context.

NESO

Carbon-intensity observations and forecasts by postcode area.

Weather/PVGIS

Solar forecast assumptions and weather context for recommendations.

Device health checks still needed

Backend work
Token healthTesla refresh flow and expiry warnings
Telemetry ageLast successful source collection per provider
Meter reconciliationCommon half-hour overlap between Tesla and Octopus
Alert routingNotification preferences and severity thresholds
Settings

Settings

Account, subscription, notifications, preferences, energy devices, configuration, and product information.