I want to Install Solar Panel at home, how to calculate it, details are as following?

Hey Qaiser, do you know those loads on the ceiling fans are correct? They seem high to me. I also expect the lights are not on 24/7, or even all night. Maybe 4 hours per night average? That comes to 20 X 4 lights X 4 hours = 320 watt hours (.32 kwh) The fans are probably more, but when we run ours, it isn't even using 30 watts at a medium setting, and I turn it off when I'm not at home.

I could guess at the total power needs, maybe 2 kwh per day. I know your said 10 hours sun per day, but the sun is not noon equivalent at 8 am or 6 pm. Most sunny places average 5 to 6 hours of "noon time sun hours"per day. If you live in the desert and it's hot, that actually degrades the panels performance some. To get 2 kwh reliably each sunny day, you probably need 600 - 800 watts of solar array, this will also overcome losses in battery charging and inverter performance. Even if the lights and fans are DC, you still need a battery or you have no lights at night. My guess is you want to store 2 days worth, so I would go with 4 Trojan T-105 golf cart batteries, about a $400 USD investment.

Is there a reason you just want to run fans and 4 lights? Most homes have other things, like refrigerators to consider. If you're just trying to save money by offloading these items to your solar panel, I'd suggest putting the same money into long term bonds and just paying the electric bill with the interest. You'd still have the money later if you needed it for something else, but your electricity in the mean time would be free, no household wiring needed.

If it were me, and I had a house that I wanted to just run the fans and lights on solar with, I'd go with LED 12 volt strips instead, they run on 12 volts, then use DC fans,they don't have to be ceiling fans, just get a few at an RV or truck stop supply place. Then you can skip the inverter, an expensive part of the system, and if the grid power goes out, you still have LED lights and fans, and you can even wire a couple 12 volt outlets to the system to charge your cell phone, ipad, and so on. Take care Qaiser, Rudydoo

your connected load is 680 watts x 24 hours for 16.32 KWH. to generate 16.32 KWH in 10 hours of sunlight would require a 1.6 KW system. if this is a 12 volt system, you need 136 amps for charging and 56 amps for operating. your battery system will require 56 amps x 14 hours capacity, or 784 AH. 136 amps is a mighty heavy duty charge controller. you might want to consider going to a 48 vdc system to cut your losses and expense. these numbers are all for 100% efficiency and full daylight.

if you need an exact figure talk to a solar system dealer ... if the fans and lights are to be on all night, because 600-700watt is a massive load really --- my best 'guess' is you would need at least 2000W of panels, about (12)200ah batteries, and something like a 2500w sine inverter ... thats not including the charging system and transfer switch if you are required to have that ... of course you could go smaller but planning to be conservative is necessary with solar, unless you have alot of funds .. so if you could make do with one fan and one light at night you could go alot smaller - maybe 4 batteries, and 400 watt of panel ..

Installing a solar panel may be a good decision but it would be good if you can minimze your energy needs by motorization or home technology improved.Combining automated window shadings with light control and temperature control and you have an energy management system that is simple to use, reliable, and dare we say fun.

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