Battery Threshold

Premium

Battery Threshold watches your battery level and charges from the grid when it drops too low — automatically, during the time windows you choose. Set a floor and a target, and Grid Getter handles the rest.

What it does

Monitors battery level in real time. Grid Getter checks your battery percentage every minute via Tesla telemetry.
Charges when needed. If your battery falls below your threshold, Grid Getter switches your Powerwall to Autonomous mode and sets a battery reserve equal to your charge target. Tesla draws from the grid to reach that level.
Backs off automatically. Once your battery hits the target, Grid Getter returns your Powerwall to Self Consumption mode — so it stops pulling from the grid once the job is done.
Stays charged (optional). Enable Hold Charge to keep your Powerwall in Autonomous mode at the target level rather than switching back to Self Consumption. Useful when you want to guarantee a minimum charge through a specific window.
Resets at window end. When the active time window closes, your Powerwall returns to Self Consumption regardless of battery state.

How Grid Getter charges your battery

Battery Threshold doesn’t run on a timer — it reacts to your actual battery level.

Every minute, when telemetry from Tesla arrives, Grid Getter evaluates your battery state against your settings:

Battery state	What happens
Below `Threshold` %	Switch to Autonomous mode, set reserve to `Charge To` % — grid charging begins
Between `Threshold` and `Charge To` %	No action — charging is already in progress
At or above `Charge To` %	Return to Self Consumption (or hold at target if Hold Charge is on)
Window ends	Always return to Self Consumption

Setting a battery reserve in Autonomous mode tells your Powerwall to treat everything below the reserve as off-limits for home discharge — so Tesla charges up to that level from the grid, then holds it there.

When to use it

Pre-charge before a peak window. If you have a Peak Time automation that holds your reserve at 30% during evening hours, use Battery Threshold during the day (say, 8 AM–2 PM) to ensure your battery is fully topped off before peak starts.

Protect against overnight depletion. Set a threshold of 15% with a 7 AM–9 AM window. If your battery ran low overnight, Grid Getter charges it each morning before you start drawing power.

Guarantee a storm reserve. Before severe weather season, set a high threshold window during off-peak hours so your battery stays charged without having to think about it.

Creating a Battery Threshold automation

Go to Automations and find the Smart Management section at the bottom of the page
Click + Add
Give your automation a name (e.g., “Morning Pre-charge”)
Set your Threshold — the battery percentage that triggers charging (default: 20%)
Set Charge To — the target battery percentage to charge up to (default: 50%)
Optionally enable Hold Charge to stay in Autonomous mode at the target level instead of reverting to Self Consumption
Set your Active Times — one or more time windows during which this automation can run (default: 7:00 AM–3:00 PM)
Adjust Days of Week and Months to match your schedule
Click Create Automation

Schedule modes

When setting Active Times, you can choose how the schedule is determined:

Custom window — you pick specific time windows when the automation is allowed to run. You can add multiple windows (Premium).
Outside Peak Time and DemandGuard windows — Battery Threshold automatically runs during any time not covered by your active Peak Time or DemandGuard automations. This is the recommended mode if you already have those automations set up — Battery Threshold fills the gaps without overlapping them.

Overlap warning

If you set a custom window that overlaps an active Peak Time or DemandGuard automation, Grid Getter shows a non-blocking warning: “This window overlaps with [automation name]. Battery Protection will defer during that time.”

This is informational — Battery Threshold still saves and runs, but it won’t charge during the overlapping period. During Peak Time or DemandGuard windows, Battery Threshold defers automatically.

Settings reference

Setting	What it does	Default
Name	Label for this automation	Battery Threshold
Description	Optional note	Empty
Threshold	Battery % below which charging triggers	20%
Charge To	Target battery % to reach	50%
Hold Charge	Stay in Autonomous mode at target instead of returning to Self Consumption	Off
Schedule Mode	Custom windows or derived from other automations	Custom
Active Times	Time windows when the automation can trigger (custom mode only)	7:00 AM–3:00 PM
Days of Week	Which days the automation is active	Mon–Fri
Months	Which months the automation is active	All

Example configurations

Pre-charge before peak hours

Threshold: 25%
Charge To: 80%
Hold Charge: off
Active Times: 6:00 AM – 2:00 PM
Days: Mon–Fri

If your evening peak window starts at 4 PM and your battery tends to drift low during the day, this keeps it topped up during cheap off-peak hours so it’s ready when peak arrives.

Overnight minimum battery floor

Threshold: 10%
Charge To: 40%
Hold Charge: off
Active Times: 6:00 AM – 9:00 AM
Days: Every day

A short morning window that catches any overnight depletion. If the battery is already above 10%, nothing happens.

Weekend storm reserve

Threshold: 50%
Charge To: 90%
Hold Charge: on
Active Times: 8:00 AM – 6:00 PM
Days: Sat, Sun
Months: Jun, Jul, Aug, Sep

Keeps the battery well-charged on weekends during summer storm season. Hold Charge keeps it at 90% through the window rather than letting it drift.

Plan requirements

Battery Threshold automations require a Premium subscription.

Some settings are restricted on lower tiers:

Hold Charge — Premium only
Multiple active time windows — Premium only
Custom days of week and months — Premium only

If you’re not on Premium, your existing automations continue to run with default schedule settings. See Subscription Tiers for upgrade options.