No, this isn't a guide about how to wire past your electricity meter, but using the sun and wind for free electricity is just as good as if you did! With the ever-rising price of electricity more and more people are looking at alternatives to save money. It used to be a few years ago that the pay back on a solar power system was over 20 years, but nowadays you can hope to pay for your installation in 5 years or less - after that you are making money.

There are actually three main alternative sources for electricity: 1) The Sun, 2) The wind 3) Running water. Of course there are others but these are the ones you'll most commonly find solutions for on eBay. This guide shows what you have to look for when making your buying decicions.

MORE VOLTS IS BETTER

The first and most important thing to remember is that the lower the voltage of the system you buy, the thicker wires you'll be needing for it. The reason for this is based on a very simple piece of math called Ohm's law which states that voltage equals current times resistance. Therefore if you have a regular mains wire at 120 volts and capable of handling 60 amps of current - if you then choose to run a 12 volt power source through this wire it will still only be able to carry 60 amps. To get the same amount of electricity through a wire at 12 volts you would have to have a wire capable of supporting 600 amps. Because of Ohm's law if you decrease the voltage 10 times you must multiply the current 10 times to get the same electrical throughput.

Even if you skipped through that little explanation, the results of it are simple, you really should try to buy the highest voltage system you can. If you can get 24 volt panels instead of 12 volt you will halve the size of wire required - or if you can get a 48 wind turbine, the wire you will need will only be 1/4 the size it would have to be for 12 volts. This will save you a lot of money on wire.

The only downside is this. Lower voltage panels and equipment are generally cheaper as they were designed to run on standard car batteries. The higher voltage equipment you buy, the less you will find and the more it will cost. Therefore, when looking at what is available on eBay you should weigh up the different costs of equipment and wiring. This means get a good estimate for how much wire you will be needing first and find out the prices you can buy it for.

BATTERIES OR GRID TIED OR BOTH?

If you are not connected to the power grid you have only one choice - you must buy batteries to store the power you generate so you have it available for when the sun is out or at night or when there's no wind etc. The best batteries to buy economically are golf cart batteries. They are designed to allow many deep discharges and recharges. Regular car batteries simply will not do - the lead in them will be used up and the batteries killed in no time at all. Even marine batteries are still not as good as golf cart batteries (although they are a lot better than car batteries). Most golf cart batteries are 6 volts so you will have to create strings of them in series to make up the voltage of your system.

Alternatively, if you have grid power you can actually use the grid as your battery. When your alternate power source is providing excess power you can sell it to the grid by spinning your meter backwards. However, this can cost several thousand dollars to get the right equipment as required by your power company. But then again, buying enough batteries to keep you going can cost about 2/3 of that - and you will have to replace them every 5-7 years or so. So make your choice. Some people have a smaller battery bank and also tie to the grid - this provides electricity to your house when there is a grid power outage. However, it is the most expensive of all three options.

Generally, even though it may cost more, unless you are experienced and confident with charging dozens of batteries safely (ensuring the hydrogen gas released by them does not get ignited and is safely ventilated), and prepared to maintain the electrolyte and distilled water levels, it would be recommended to go for the grid tie system if you can - it will be plug-in and forget.

WHAT ELSE IS NEEDED?

So, when you have made your decision, if you are going the battery route you need to search for deep cycle batteries and power inverters that will invert from your system voltage up to 120 volts (or 220-240 volts in some countries). If you are doing this yourself you will have some idea of the power consumption of your house. If it is about 3Kw then you need a 3Kw inverter with 6Kw peak (to handle high short loads such as motors in fridges starting etc).

Many companies make inverters and they are all available on eBay. There are two main types: True sine wave inverters and modified square wave. Sine wave are the best and the most expensive - but they are as good or better than the grid power supply, so all your equipment will run smoothly. Modified square wave inverters are a lot cheaper but can make some hi-fis or TVs crackle. They can also make some electric motors such as fan motors hum. If this annoys you, you can get suppressor devices for many household items - or you may have to replace some of your items for ones that handle noisy power supplies better. The saving you will make getting a cheaper modified square wave inverter could more than fund replacing some of your less tolerant appliances. In the particular case of humming fans: if you can replace them with DC fans (for example 12 volt using a transformer), the hum will substantially reduce.

If you are going for grid tie then simply look for grid tie systems. They will be true sine wave to ensure you give the grid as good a supply as it already carries.

SOLAR, WIND OR HYDRO

If you have south facing rooftops and at least 5 hours of sunshine per day, solar should work well for you. Alternatively you can buy mounts that attach to a pole and track the sun for you, in which case only your average daily sunshine will be important. If you have wind above the national average then wind turbines are also something to consider. Beware though, some can be quite noisy. Also, for best results you need to mount them high up and may need planning permission etc. If you are lucky enough to have a stream or river running through your land you may well be able (subject to any planning requirements or restrictions) to install the easiest power generation equipment of all. A hydroelectric turbine is very easy to install, requires minimal maintenance, is less subject to high wind problems and can generate a lot of power, depending on the water flow.

GET A PROFESSIONAL TO INSTALL

Having read all the above you should have a basic idea of what you can do to save on your electricity. But you really must consult a qualified electrician skilled in low voltage work. They will save you a fortune on mistakes you will likely make - plus they may well save you from electrocuting yourself. In conjunction with your electrician you should be able to draw up the specifications for an economical system that will pay for itself inside 5 years - and everything you need to build it will probably be on eBay at much cheaper prices than elsewhere

UNTIL YOU CONSULT YOUR ELECTRICIAN

Do you want to save a lot of electricity now - and also have less of a draw on your alternative system when it's installed? Then search for low energy bulbs and replace every single incandescent bulb in your house. They will use 5-7 times less power and also last about 10 times longer. In fact there are now LED bulbs on eBay that use 10-15 times less power (though you may need a few of them as the technology is still young and they are not as bright as they will be). Even so - LED bulbs use so little power they will hardly spin your meter at all.

Also, get any manual thermostats in your house replaced with programmable ones. Then you can get your heating and AC to turn on and off when you choose and at temperatures you choose. You'll save much, much more than the cost of replacing your thermostats in just the first year. And if you can stand it - do not heat your house above 68 degrees and do not cool it below 82 degrees (Use ceiling fans to cool the extra few degrees down from there - fans use 10% of the power that an AC system does). Every 1 degree of heat or cooling you save reduces your power bill by 7%. So a full 10 degrees most of the year will cut your bill by 70%. Oh, and did you fill all the cracks around your home where there's a draft? That'll save you huge amounts of money for just the cost of a few tubes of caulk.

And, last but not least. When it's dry and windy unplug your clothes drier and hang your washing on the line. For the amount of power one hour of drying in a 6Kw drier uses, you could run a low energy 7 watt bulb giving off 40 watts of light for 857 hours. Or more than a month. Put another way, you could run 35 of these bulbs all day and night for 24 hours for the same amount of power used in that one hour of spin drying. But on a mildly windy day your clothes will dry inside an hour on a washing line.

...See how much free power mother nature gives you? Take it - it's yours!

If you have found this advice helpful, please click [YES] on the Was this guide helpful? link below Thanks!