Solar panels power generation is commonly given in watts e g.
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.
Then a number of solar panels that you need are.
You need to ensure the pump can take that voltage.
Use our 12v solar panel calculator.
For an on grid system it is down to budget and space available.
Rates are based on a 12v system with 5 hour charging times.
You have chosen your system voltage to be 12v and your solar panel to be 240watt for the 12v solar system.
Complementing this range are the redarc sine.
Actual charging times will vary depending on geographic location time of year angle of the sun relative to the rv solar panel and weather conditions.
This is done by finding the watt rating of all the devices you intend to run.
Redarc have a range of solar panels and blankets that are designed to the highest quality to maximise efficiency and integrity.
The number of solar panels needed 5000 240 20 8 solar panels.
To calculate the energy it can supply the battery with divide the watts by the voltage of the solar panel.
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.
Off grid firstly you need to calculate the amount of power you will require.
Please note that solar panels are not 12v i repeat solar panels are not 12v.