How Much Could You Save with Grid Getter?
Model your summer peak window, demand charges, and battery strategy to see how much unmanaged peaks, full battery discharge, and DemandGuard could change your monthly bill.
Peak Summer Inputs
Describe your summer rate plan, your battery, and which high-demand loads may overlap during peak hours.
Usage helps estimate the baseline household demand and time-of-use energy cost around your summer peak window.
Battery
Defaults match a single Powerwall 2-style estimate. Adjust if your usable capacity or continuous output differs.
Peak-Time Loads
Check or count anything that may overlap during the billed demand window. The calculator assumes those loads can coincide to set your demand peak.
* Illustrative estimate only, not a savings guarantee or utility bill quote. Summer demand outcomes depend heavily on exact interval timing, appliance overlap, solar production, weather, battery health, and utility billing rules. DemandGuard results assume a sustainable target across the full summer peak window; real solar conditions can improve or worsen the outcome.
How It Works
Three steps to start saving on your energy bill
Set Your Summer Peak Inputs
Choose your utility plan, enter your battery details, and check which high-demand appliances can overlap during your billed summer peak window.
Compare Three Peak Scenarios
See the estimated monthly impact of unmanaged peak use, full Powerwall discharge, and a DemandGuard-style demand ceiling built around the plan’s reset interval.
Use The Strategy That Lasts
The key question is not just “Can the battery help?” It’s whether it can hold through the whole summer peak window without handing a later demand interval back to the grid.
Frequently Asked Questions
How accurate is this calculator?
This calculator is illustrative only. It uses published tariff data plus simplified assumptions about overlapping loads, battery discharge, and summer demand timing. Actual savings depend on your specific tariff details, appliance overlap, solar production, weather, and battery behavior, so these numbers are not a guarantee or billing quote.
What if I don't know my energy plan?
Check your most recent utility bill — your plan name or code is usually near the top. SRP solar customers often see E-27 or E-15. APS customers commonly see R-3 for the 4–7 PM demand plan. If you’re not sure, your utility can confirm it.
Does Grid Getter work with my utility?
Grid Getter currently supports SRP and APS rate plans in the Phoenix metro area, with more utilities being added regularly. Grid Getter works with any Tesla Powerwall regardless of utility — the calculator focuses on plans where we have detailed rate data.
Why can DemandGuard outperform full discharge?
Naively draining the battery early can still leave you exposed later in the same peak window, which means a late interval can still set your monthly demand charge. DemandGuard works differently: it targets the lowest sustainable grid ceiling that your battery can hold across the full window instead of spending all your battery energy up front.
Ready to Start Saving?
Create a free Grid Getter account and connect your Tesla Powerwall. See real savings from day one with smart energy automation.
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