admin | 
05 18th, 2012| 
I eventually want to add solar pannels to my roof to help with power, but I have no clue. There are 50 watt 80 watt 160 watt and even one that says 8.4kW. I have no idea what any of this means.
So what I am asking is… would some of these run the entire house all day or half of it or just a few light bulbs. Really whats the best options to save on electric bill.
Will is on the right track. Solar hot water and heating is a cheap effective start to save serious money. Solar electricity is unlikely to save you money. You need to buy the panels, battery storage and inverter.
You can get a rough idea of what each PV panel will power by doing some simple sums. Assume 60% efficiency in the system, less than full sunlight, battery losses, inverter losses. Assume 12 hours of sunlight, obviously more in Summer, less in Winter. so say 60W panel gives 60 x 12 x 0.6 = 432 Watt hours of useful output per day. So you could run a 6 x 12W compact fluorescent bulbs for 6 hours, or 12 for 3 hours. Or you could run a 120W TV screen for 3.6 hours. Or run a 900W electric iron for 29 minutes.
You get the picture, you don’t get much energy …. A 120W panel gives you twice as much of course.
The cost of the solar set up is much greater than the cost of electricity in most cases.
The better savings are in improving your power conservation in the first place. Use LED lights, they give more light for less electricity used and last much longer and have cool options like dim-ability and colour change effects if you want. Avoid using electricity for heating cooking, that uses lots of electricity for little return, use solar heating, insulation and heat pumps instead of ‘heaters’.
If you want to go solar of course you should do all that as well to reduce your electricity use, but the savings are in the reductions.
I run an entire office with 10 staff all using computers on less than 8.4KW, so that is more than enough for a domestic house. [provided you use it wisely.]
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