Redarc have a range of solar panels and blankets that are designed to the highest quality to maximise efficiency and integrity.
Solar panel calculator 12v.
120 watts 18v 6 6 amps.
As far as what is required you said it is a 20 60 watt pump so any panel in that range in full sun will turn the pump as long as the pump is designed to run at the higher voltage the panel puts out.
Off grid firstly you need to calculate the amount of power you will require.
Rates are based on a 12v system with 5 hour charging times.
Then a number of solar panels that you need are.
The solar panel calculator then estimates how much your total appliance power requirement is per day and suggests products and equipment that will help you meet those needs.
Then times this value of each device by the time you intend on running it for.
For an on grid system it is down to budget and space available.
The number of solar panels needed 5000 240 20 8 solar panels.
This is done by finding the watt rating of all the devices you intend to run.
A 12v solar panel will output around 16 18 5 volts when connected depending on the panel.
After rounding it up we receive that you need to buy 21 solar panels.
Complementing this range are the redarc sine.
You need to ensure the pump can take that voltage.
Please note that solar panels are not 12v i repeat solar panels are not 12v.
To calculate the energy it can supply the battery with divide the watts by the voltage of the solar panel.
You have chosen your system voltage to be 12v and your solar panel to be 240watt for the 12v solar system.