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Well for now I do most of my tasks on my phone. It is good enough. And I plan to get an inverter in the coming months

Getting an inverter is an amazing idea. As power holding companies may decide to misbehave, especially in times like these.

But they are not cheap. I am looking for a way to pay installments to acquire atleast two lithium batteries

There are companies that accept installmental payments for inverters. I've witness a few but I can't quite place their names.