For historical reasons, there are three off grid solar systems at my place.
One 1 kW PV array, 4×250W with one 1kW inverter. 24V battery bank. (+/- 30 000 THB)
Coming next one 3.25kW array, 10 × 325W panels, one 3.5kW inverter, 96 V battery bank.
I bought eight 150 AH gel batteries last year, 64 000THB.
The last one is 4 × 625W array, hybrid controller inverter 3.0kw 24V battery bank. I must have paid some 7 550 THB for the inverter, I've just bought four 100 AH Li FePO4 batteries, 24 000 THB, add another 30 000 THB for the panels and some accessories, total around 62 000 THB.
Li FePO4 batteries have become less expensive and last much longer than flooded batteries,
We have two fridges but no aircon, daily consumption 4.5-5kWH.
The first 1.0 kW system is not used for the house any more, but for a small house 100m away used now and then by my wife's children, The two other systems are used separately and there's a transfer switch.
I like that two systems approach because, like any technical system, they can fail.
I was about to forget another 6×400W array for my deep well pump. The deep well was a budget of +/-70 000 THB all included. The panels were placed by local workers, I did all the wiring by myself.
The budget was the cost of materials plus manpower at local price, I did all the electricity..
Unfortunately, the file with the detailed account was on a drive that crashed.
pn27s3BDxd0 This is the YouTube address for the deep well, the link isn't active because YouTube does not allow it, just paste in the search function. I made other videos, but they are in French.