[quote="muhsinmalik, post:3, topic:21866"]
I want to use this system when there is no electricity...
I want to run my refrigerator on PVs directly without using batteries during daytime.
since you only want free power during day time, grid tie will work easily
grid tie will keep working without wapda as well, as long as there is proper power provided
fridge need 400W.
install panels of 700W..
after power conversion, you will get constant 500W.. wich is more than fridge needs.
so even when wapda goes it will keep working the fridge in day light only when constant power of 400W is provided
if it rains, or cloudy, your fridge will shut down. if panels are dirty or faulty, and donot produce 400W, fridge will shut down. at night, no solar power, fridge shut down.
for those reasons, a battery bank is compulsory..
your alternate is the AC solar panels,. which are expensive. but donot need inverter.