Once you have sized your battery bank and solar panel array determining which charge controller to use is comparatively straight forward.
Calculate size of solar panel battery bank and inverter excel.
Here my application is little different on solar water heater.
All we have to do is find the current through the controller by using power voltage x current.
Battery banks are typically wired for either 12 volts 24 volts or 48 volts depending on the size of the system.
Take the power produced by the solar panels and divide by the voltage of the batteries.
If inverters were 100 efficient all of the power flowing from the battery would be inverted for use by the load and the inverter would consume no power at all.
You may want to consider 600 800 amp hours of capacity based on this example depending on your budget and other factors.
The next step involved in sizing your system and also in determining how to calculate solar panel battery and inverter is to size your charge controller but before then we have to understand some components which you probably have not encountered and so do not understand this will give you a better understanding of the calculation.
I want to maintain the 70 c temperature of 50 liters approx water using 500 w dc heater for 24 7.
In reality however inverters consume some of the power that flows from the battery while inverting.
Think of this as the minimum battery bank size based on your typical usage.