Power Control Tool
Tower Energy
Calculate battery runtime during blackouts. Track device consumption. Know exactly how long your power lasts.
Get Tower Energy FreeFree download for iPhone. Offline calculations included.
Limited iOS Release
Calculate battery runtime during blackouts. Track device consumption. Know exactly how long your power lasts.
Get Tower Energy FreeFree download for iPhone. Offline calculations included.
Select your energy calculation package and activate your promo code
All features subject to device compatibility. Requires iOS 15.6 or later. Offline functionality available after initial setup. New users only.
Tower Energy calculates battery duration by combining three core inputs: your energy source capacity in watt-hours, total device power consumption in watts, and usage patterns (continuous or intermittent). The app processes these values through a time simulation slider, letting you model energy depletion from 0 to maximum estimated runtime. As you adjust the timeline, remaining capacity updates in real-time with analog-style circular gauges showing percentage consumption and hours left.
Each device you add gets tagged with its wattage draw, quantity multiplier, and usage mode. A refrigerator pulling 150W continuously behaves differently than LED lights at 60W used intermittently. The app aggregates all active devices into a total consumption figure displayed on the dashboard. Preset profiles (Home, Emergency, Camping) bundle common device configurations, loading multiple items with a single tap. Every device includes a power icon indicator and trash-delete control for quick editing.
The futuristic dark dashboard centers around two large circular gauges: Total Capacity (measured in kWh) and Consumption (measured in W). Both gauges use thick cyan rings that fill proportionally to current values. Below these, a segmented battery bar shows energy remaining as bright green blocks, with percentage and estimated runtime (formatted as "6h 40m") in neon green text. The time simulation section includes a horizontal slider with a white circular handle, allowing you to scrub through projected usage scenarios.
Input battery capacity in watt-hours and voltage (optional) for any power station or backup battery. Set efficiency percentage with a slider (default 100%). The app displays remaining capacity as you add devices, showing exactly how much energy you have left before depletion.
Add unlimited electrical devices with custom wattage values. Assign quantity multipliers for running multiple identical devices simultaneously. Toggle between Continuous (always on) and Intermittent (periodic use) modes. Each device shows a power icon, consumption rate, and quantity hash symbol.
See precise time estimates formatted as hours and minutes (e.g., "6h 40m"). The app calculates maximum runtime based on total capacity divided by device consumption. Runtime updates dynamically as you modify energy sources or add/remove devices. Green neon text ensures visibility on the dark interface.
Two prominent circular gauges display Total Capacity (kWh) and Consumption (W) with thick cyan rings. A smaller percentage gauge shows consumption as a red arc segment. All gauges use high-contrast colors on dark backgrounds with glowing effects around interactive elements for a futuristic aesthetic.
Navy blue card backgrounds with cyan borders create a technical monitoring station feel. Neon accent colors (cyan, green, orange, red) highlight critical information. All text uses white for primary content and gray for secondary labels. The interface mimics industrial control panels with uppercase section headers.
All runtime calculations happen locally on your device with no internet connection required. Data persists through local storage, so your energy sources and devices remain saved between sessions. Export-ready preset profiles let you share configurations or back up your setups.
Free on iOS 15.6+. No account required. Installs in under 30 seconds at 6.1 MB.
Download for iPhoneRated 4+ for all ages. Offline functionality enabled. Regional availability may vary.