The massive expansion of coal burning in India is a somewhat bigger problem, by many orders of magnitude. Maybe we should focus on that instead. Solar-to-battery would be a good solution to many Indian and African villages that are not on the grid at all.
And here you do the classic mistake of assuming that the big problem when it comes to carbon emissions is the third world. It is not. Not in absolute numbers, and especially not in numbers related to the population. The BIG problem is the US, which combines absurdly high carbon emissions with a big population. If I recall correctly US emits about 3 times as much carbon as India does in absolute numbers, and about 12 times as much per capita(!).
If there is any place where we could easily and cheaply cut carbon emissions it is in the US. Why try to reduce the emissions of a village in India, when a single household in the US emits as much carbon and also have a much better economic position to pay for any additional cost?