I’m now in the late stages of finalizing a system design for an off-grid PV system for my retirement home in the rural Philippines. The public power grid here is notoriously unreliable with at least one of more brown-outs every week, some lasting 24+ hours. To boot, grid power is very expensive.
However, while the cost of PV panels have fallen a lot, the cost of batteries, esp LifePo, remain quite expensive. Therefore, before soliciting supplier bids for a system, I would appreciate the advice of more experienced solar experts, on whether it makes sense to buy more PV panels as a way to reduce the size and cost of a battery bank.
My thoughts are that with enough PV panels, even on a cloudy day, the system could generate sufficient power to serve most of our essential household needs, or at least extend the capacity of our batteries.
Not sure how the charger controller would handle the ‘excess’ power being generated by panels on a sunny day though…
Would be grateful for any guidance.