# Solar Panel Calculator Plus — Solar Panel & Battery Capacity

> Off-grid solar system calculator for panels, batteries, and inverters. (iPhone/iPad app by Nitrio.)

- Source: https://appshunter.io/ios/app/solar-panel-calculator-plus/id1358184660 (this page in markdown: same URL + `.md`)
- Developer: [Nitrio](https://appshunter.io/developer/321121189)
- Category: Productivity, Utilities
- Price: $2.99
- Rating: 3.30/5 from 23 App Store ratings · 4 written reviews indexed
- Age rating: 4+
- Requires: iOS 12.0 · 8 MB
- Languages: American English
- Released: 2018-03-14
- Data updated: 2026-08-22
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/solar-panel-calculator-plus/id1358184660/reviews.md

## What is Solar Panel Calculator Plus?

Solar Panel Calculator Plus calculate custom Off-Grid Solar Home Power Systems. Use these handy calculator to help decide which system size is right for you. You can calculate the Exact Number of Solar Panels You Need For Your Usage Plus the Space you need. Also include Battery Capacity for your Home Power Systems.

Daily energy use:
Find the energy used in a day. Figure out how long each electronic device will be run in hours during a day. Multiply the wattage of each device by its run-time to get the energy in watt-hours per day. Add up all the watt-hour values to get a total for your home. 

Example: Light bulbs run for 5 hours a day. Computer runs for 2 hours a day. 100 x 5 + 300 x 2 = 1100 watt-hours. 

Inverter size:
To determine the inverter size we must find the peak load or maximum wattage of your home. This is found by adding up the wattage of the appliances and devices that could be run at the same time. Include everything from microwaves and lights to computers and clocks. The sum will tell you which inverter size you need.

Example: A room has two 60 watt light bulb and a 300 watt desktop computer. The inverter size is 60 x 2 + 300 = 420 watts. Multiply with 1.2 or 1.5 into a safe area.

Days of autonomy:
Now decide how many days worth of energy you want to store in your battery bank. Generally this is anywhere from two to five.

Battery bank capacity:
Example:  You want the battery bank to last three days without recharging and that you use 5.0 kwh per day. 
As 5.0 x 3 x 2 = 30.0kwh, this is the energy we need from the batteries. 
Converting this to AH we have to divide by the voltage of your system. 
This can be 12, 24 or 48 for commercial application. If we choose to use 48V, the minimum AH capacity is then 30 000/48 = 625 AH. 
Now if you divide by your battery's rating you find the number of batteries you must use.
The larger the system you have, the higher the voltage you should have. It is normal to match a 12 V battery bank to a 400 W power system. A 5 kW system would work most appropriately with a 48 V wiring system, in order to decrease current flow in the wires.

Note: All calculations assume only a 50% discharge to your batteries to optimize battery life.
Note: Colder temperatures have a negative effect on the capacity of your battery bank. If your battery bank is always indoors in a heated area then you don't have a problem. But if they're stored in an unheated area during the winter then you'll need to account for this.

Solar Panel:
The most typical solar panel size used for residential installations is 65 inches by 39 inches. And the wattage output range from 200 - 330 watts.

*Thanks for your support, stay tune for more update to come

## Key features

- Calculate solar panel requirements
- Determine battery capacity
- Calculate inverter size
- Estimate daily energy usage
- Plan days of autonomy
- Optimize battery life calculations

## Recent user reviews (4 of 4)

All indexed reviews: https://appshunter.io/ios/app/solar-panel-calculator-plus/id1358184660/reviews.md

### 2/5 — No geo data inputs

*2023-02-11*

Not useful for me , no ability to input geography

### 1/5 — Total crap

*2022-01-16*

It’s like a toy with a few boxes for numbers with and some generic answer at the bottom but never changes a total waste of space on my phone

### 3/5 — Room for improvement

*2020-04-05*

Could have better features like appliance watt hour calculator, somewhat disappointed but the basics are good. A little pricey for what it is though...

### 5/5 — Great Starting Knowledge into Solar Power

*2019-11-04*

This is the best intro into solar power on the app store, use current power provider for the info needed.

## Frequently asked questions about Solar Panel Calculator Plus

### What is Solar Panel Calculator Plus used for?

Solar Panel Calculator Plus helps you design custom off-grid solar home power systems. It calculates the exact number of solar panels, battery capacity, and inverter size needed based on your energy usage.

### How does Solar Panel Calculator Plus calculate daily energy use?

You input the wattage of each electronic device and how long it runs per day. The app sums these watt-hours to provide your total daily energy consumption.

### Can Solar Panel Calculator Plus help with battery storage?

Yes, it calculates the required battery bank capacity based on your daily energy use and the number of days of autonomy you wish to have without recharging.

### What information is needed to calculate inverter size?

To determine the inverter size, you need to sum the wattage of all appliances and devices that could be run simultaneously to find your home's peak load.

### Does Solar Panel Calculator Plus account for battery lifespan?

Yes, all calculations assume only a 50% discharge to your batteries to optimize their lifespan. It also notes that colder temperatures can negatively affect battery capacity.

### Is Solar Panel Calculator Plus available on multiple devices?

Solar Panel Calculator Plus is available for iPhone and iPad, as indicated by its supported devices list.

### How often is Solar Panel Calculator Plus updated?

The app was last updated on December 17, 2025, indicating a recent update. The developer also mentions staying tuned for more updates.

### What is the price of Solar Panel Calculator Plus?

Solar Panel Calculator Plus is a paid application, priced at $2.99.

## Version history (last 3 releases)

### 1.2 — 2025-12-17

- Updated for the newest devices.
- Minor bugs fixed.

### 1.1 — 2020-09-09

- Update for Newest Devices.

### 1.0 — 2018-03-14

No release notes.

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All apps by Nitrio: https://appshunter.io/developer/321121189

## Related topics

[solar panel battery](https://appshunter.io/ios/topics/solar-panel-battery) · [solar electrical calculator](https://appshunter.io/ios/topics/solar-electrical-calculator)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-22.*