I started many years ago, to set up a solar power system, using batteries as a backup power source. That is now complete I have installed 4- 200-amp hour power queen lithium batteries and a Renogy 60A 12V Input MPPT Solar Charge Controller. as well as an aims 8000-watt inverter. This system will now power my well and all the important items in my house when the power is out.
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Link for Renogy 60A 12V/24V/36V/48V DC Input MPPT Solar Charge Controller: https://amzn.to/3tio74b
Power Queen 12.8V 200Ah https://amzn.to/3WkEYg3
Power Queen 12.8V 100Ah https://amzn.to/3hxzDmT