• May include: A digital spreadsheet interface titled Off-Grid Solar + Battery Sizing Calculator by tobulab. It displays a Daily Load Table and System Design window with technical data, including PV array size, voltage, and current specifications.
  • May include: A digital daily load table spreadsheet titled tobulab. The table includes columns for appliance, AC or DC type, quantity, power in watts, hours per day, peak load timing, start surge multiplier, energy in Wh, and peak running load.
  • May include: A digital system design interface titled PV array and string check, displaying technical solar energy calculations including module rated power, voltage ranges, and MPPT tracker limits with specific numerical data points.
  • May include: A digital system design interface titled Battery, controller, inverter. The screen displays technical data for battery banks and charge controllers, including values for capacity, voltage, current, and power in watts.
  • May include: A digital interface titled Cost and Simple Payback displaying financial data for energy systems. The screen shows tables for prices, assumptions, capital costs, and payback calculations with text labels and numerical values in USD.
  • May include: A digital product listing for an Excel file titled Off-Grid Hybrid Solar and Battery Sizing. The interface displays sections for Start Here, Loads, System Design, Cost and Payback, and Lists, with a preview window showing a color-coded spreadsheet guide.
  • May include: A digital spreadsheet interface titled Off-Grid Solar + Battery Sizing Calculator by tobulab. It displays a Daily Load Table and System Design window with technical data, including PV array size, voltage, and current specifications.
  • Product video
  • May include: A digital daily load table spreadsheet titled tobulab. The table includes columns for appliance, AC or DC type, quantity, power in watts, hours per day, peak load timing, start surge multiplier, energy in Wh, and peak running load.
  • May include: A digital system design interface titled PV array and string check, displaying technical solar energy calculations including module rated power, voltage ranges, and MPPT tracker limits with specific numerical data points.
  • May include: A digital system design interface titled Battery, controller, inverter. The screen displays technical data for battery banks and charge controllers, including values for capacity, voltage, current, and power in watts.
  • May include: A digital interface titled Cost and Simple Payback displaying financial data for energy systems. The screen shows tables for prices, assumptions, capital costs, and payback calculations with text labels and numerical values in USD.
  • May include: A digital product listing for an Excel file titled Off-Grid Hybrid Solar and Battery Sizing. The interface displays sections for Start Here, Loads, System Design, Cost and Payback, and Lists, with a preview window showing a color-coded spreadsheet guide.
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Off Grid Solar Calculator Excel, Panel and Battery Sizing Spreadsheet, Inverter Sizing

Item highlights

  • Digital download
  • Digital file type(s): 1 ZIP

Seller's description

Plan an off-grid or hybrid solar system from your own daily loads: PV array, battery bank, charge controller and inverter, with a string voltage check and a simple payback view.

WHAT IT DOES
- Daily load table for up to 40 AC or DC appliances: energy per day, peak load and motor start surge are added up for you
- PV array size from peak sun hours and your losses (temperature, dust, wiring, MPPT, battery)
- Modules per string and strings in parallel, checked against your charge controller or hybrid inverter: cold-weather Voc against max input voltage, hot and cold Vmp inside the MPPT window, current per tracker
- Battery bank from days of autonomy and depth of discharge (LiFePO4 or lead-acid): units in series and parallel
- Next standard charge controller and inverter size, with a surge check
- Cost by component and a 25-year cumulative cash view (energy price rise, O&M, battery replacement)
- Every check line turns green (OK) or red (FAIL) and says why

WHAT'S INSIDE (1 Excel file + a printable PDF of the example)
Start Here, Loads, System Design, Cost & Payback, Lists (standard sizes you can edit). Ships with a worked example: an off-grid cabin on a 48 V LiFePO4 bank.

WORKS WITH
A script opened this file in Microsoft Excel for Mac 16.114.3 and ran a full recalculation. Every cell matched the values stored in the file, with no error cells. That test did not type new data. Excel for Windows, older Excel versions and Google Sheets have not been tried. The formula tests ran in LibreOffice. Metric units, any currency. No macros.

GOOD TO KNOW
- Digital download. Nothing is shipped.
- This is a monthly-average energy balance, not an hour-by-hour simulation. For a bankable design use PVsyst, SAM or similar.
- Estimation aid: check against your local rules (for example IEC 62548 or NEC 690) and the equipment datasheets, and have a qualified installer or engineer review the design.

HOW THIS WAS MADE
The workbook was designed and built with the help of AI tools. Scripts recalculated the file in LibreOffice and compared it with a separate Python calculation of the same method, across 8 test systems including edge cases.

For your own use and your company's projects. Please do not resell or share the file.

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NowPrice:$4.27

Original Price: $5.69

25% off

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Sale ends on November 16

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Seller's description

Specifications

May include: A digital spreadsheet interface titled Off-Grid Solar + Battery Sizing Calculator by tobulab. It displays a Daily Load Table and System Design window with technical data, including PV array size, voltage, and current specifications.

Plan an off-grid or hybrid solar system from your own daily loads: PV array, battery bank, charge controller and inverter, with a string voltage check and a simple payback view.

WHAT IT DOES
- Daily load table for up to 40 AC or DC appliances: energy per day, peak load and motor start surge are added up for you
- PV array size from peak sun hours and your losses (temperature, dust, wiring, MPPT, battery)
- Modules per string and strings in parallel, checked against your charge controller or hybrid inverter: cold-weather Voc against max input voltage, hot and cold Vmp inside the MPPT window, current per tracker
- Battery bank from days of autonomy and depth of discharge (LiFePO4 or lead-acid): units in series and parallel
- Next standard charge controller and inverter size, with a surge check
- Cost by component and a 25-year cumulative cash view (energy price rise, O&M, battery replacement)
- Every check line turns green (OK) or red (FAIL) and says why

WHAT'S INSIDE (1 Excel file + a printable PDF of the example)
Start Here, Loads, System Design, Cost & Payback, Lists (standard sizes you can edit). Ships with a worked example: an off-grid cabin on a 48 V LiFePO4 bank.

WORKS WITH
A script opened this file in Microsoft Excel for Mac 16.114.3 and ran a full recalculation. Every cell matched the values stored in the file, with no error cells. That test did not type new data. Excel for Windows, older Excel versions and Google Sheets have not been tried. The formula tests ran in LibreOffice. Metric units, any currency. No macros.

GOOD TO KNOW
- Digital download. Nothing is shipped.
- This is a monthly-average energy balance, not an hour-by-hour simulation. For a bankable design use PVsyst, SAM or similar.
- Estimation aid: check against your local rules (for example IEC 62548 or NEC 690) and the equipment datasheets, and have a qualified installer or engineer review the design.

HOW THIS WAS MADE
The workbook was designed and built with the help of AI tools. Scripts recalculated the file in LibreOffice and compared it with a separate Python calculation of the same method, across 8 test systems including edge cases.

For your own use and your company's projects. Please do not resell or share the file.

  • Designed by
    tobulab
  • Item type
    Digital download
  • Digital file type(s)
    1 ZIP
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Listed on Oct 25, 2026
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