Solar panels in the Philippines sounds like a very good idea, the only issue i can think of is the weather. When there is a typhoon and these panels fly off you are losing a fair bit of money to replace them. I lot of these houses have very weak roofs with just corrugated sheets, even the inner roof structures are very flimsy to say the least.
The price of purchase and fitting them will be expensive as well as the supplier will obviously be thinking that only "rich" people would even think about installing them.