Most Pakistani households considering lithium batteries are not first time buyers. They already own a UPS with a tubular bank, have replaced it once or twice, and are tired of topping up water and watching capacity fade. Switching is usually worth it, but a lithium battery cannot simply drop into the space the old one [...]

A solar tubewell has no batteries, no grid connection and no conventional inverter. Panels feed a variable frequency drive, the drive runs a submersible pump, and water comes up while the sun is out. That is the whole system. Alphasolar sizes it from head and discharge rather than from horsepower, because horsepower on its own [...]

Picking the right inverter matters just as much as picking the right panels, yet most first time buyers spend all their attention on solar panel price and barely think about the inverter until it is time to sign a quote. That is a mistake, since the inverter is what actually converts your panels' output into [...]