Here you’ll find shortcuts to all the self-reliance calculators from our Execution Plans.

## Energy Calculators

### Load Evaluation Calculator

Calculate your daily watt hour usage (you need to know this to correctly size a solar PV system).

### Minimum PV System Size Calculator

Calculate the minimum system size for your energy requirements.

### Solar PV Array Sizing

Calculate how many solar panels of a certain wattage you need in your array to meet the specified system size.

### Battery Bank Sizing Calculator

This calculator will show you how large battery capacity you need in a solar PV system, as well as how many batteries wired in series and parallel.

### Calculate the Current

Calculate the current (amps). You’ll need to know this to calculate the correct wire thickness.

### Wire Thickness Calculator

Calculate the required thickness of wires for your solar PV system

## Water Calculators

### Rainwater Catchment Area Calculator

This calculator will help you calculate the size of a catchment area, for example a roof.

### Runoff from a Catchment Surface (*English* units, i.e. feet and gallons)

This calculator will help you calculate how much rainwater in **gallons** you can collect annually from a certain catchment area.

### Runoff from a Catchment Surface (*Metric* units, i.e. meters and litres)

This calculator will help you calculate how much rainwater in **liters** you can collect annually from a certain catchment area.