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If you have a small scale renewable energy set up - for example, just a micro wind turbine or a few PV solar panels, then you will almost certainly be using battery storage rather than tying into the National Grid. In those cases there are very many suitable inverters ranging from just ?10 to many ?hundreds depending on your exact needs. If however you wish to connect your wind turbines and/or solar panels to the National Grid, you will need a Grid-tie Inverter - particularly if you intend to sell (export) electricity back to the utility company.

Grid-Tie Inverters (plug in type)
Not all grid-tie inverters operate in the same way. In general a grid tie inverter needs to be wired directly into your home electric circuit by a qualified electrician. However a simpler alternative been on the rise recently - an inverter which you simply plug into a home ring main using a standard three pin plug. This is exactly the type of power inverter provided with the popular Windsave 1000 wind turbine from B & Q.

If for example you have a laptop computer and a desk lamp drawing around 150 Watts between them, and a solar panel generaing 200 Watts which is plugged into the same ring main using a plug-in inverter, then the laptop and lamp would be powered entirely by your solar panel and any excess power would be lost to the National Grid. If you only had a 100 Watt solar panel, then its power would be supplemented by the National Grid (and you would have to pay for the extra electricity used).

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auto electronics

Pin 4 (Reset): This pin is also used in auto electronics to reset the latch and return the output to a low state. The reset voltage threshold level is 0.7 volt, and a sink current of 0.1mA from this pin is required to reset the device. These levels are relatively independent of operating V+ level; thus the reset input is TTL compatible for any supply voltage. The reset input is an overriding function; that is, it will force the output to a low state regardless of the state of either of the other inputs. It may thus be used to terminate an output pulse prematurely, to gate oscillations from "on" to "off", etc. Delay time from reset to output is typically on the order of 0.5 µS, and the minimum reset pulse width is 0.5 µS. Neither of these figures is guaranteed, however, and may vary from one manufacturer to another. In short, the reset pin is used to reset the flip-flop that controls the state of output pin 3. The pin is activated when a voltage level anywhere between 0 and 0.4 volt is applied to the pin. The reset pin will force the output to go low no matter what state the other inputs to the flip-flop are in. When not used, it is recommended that the reset input be tied to V+ to avoid any possibility of false resetting.

Pin 5 (Control Voltage): This pin allows direct access to the 2/3 V+ voltage-divider point, the reference level for the upper comparator. It also allows indirect access to the lower comparator, as there is a 2:1 divider (R8 - R9) from this point to the lower-comparator reference input, Q13. Use of this terminal is the option of the user, but it does allow extreme flexibility by permitting modification of the timing period, resetting of the comparator, etc. When the 555 timer is used in a voltage-controlled mode, its voltage-controlled operation ranges from about 1 volt less than V+ down to within 2 volts of ground (although this is not guaranteed). Voltages can be safely applied outside these limits, but they should be confined within the limits of V+ and ground for reliability. By applying a voltage to this pin, it is possible to vary the timing of the device independently of the RC network. The control voltage may be varied from 45 to 90% of the Vcc in the monostable mode, making it possible to control the width of the output pulse independently of RC. When it is used in the astable mode, the control voltage can be varied from 1.7V to the full Vcc. Varying the voltage in the astable mode will produce a frequency modulated (FM) output. In the event the control-voltage pin is not used, it is recommended that it be bypassed, to ground, with a capacitor of about 0.01uF (10nF) for immunity to noise, since it is a comparator input. This fact is not obvious in many 555 circuits since I have seen many circuits with 'no-pin-5' connected to anything, but this is the proper procedure. The small ceramic cap may eliminate false triggering.

Pin 6 (Threshold): Pin 6 is one input to the upper comparator (the other being pin 5) and is used to reset the latch, which causes the output to go low. Resetting via this terminal is accomplished by taking the terminal from below to above a voltage level of 2/3 V+ (the normal voltage on pin 5). The action of the threshold pin is level sensitive, allowing slow rate-of-change waveforms. The voltage range of auto electronics that can safely be applied to the threshold pin is between V+ and ground. A dc current, termed the threshold current, must also flow into this terminal from the external circuit. This current is typically 0.1µA, and will define the upper limit of total resistance allowable from pin 6 to V+. For either timing configuration operating at V+ = 5 volts, this resistance is 16 Mega-ohm. For 15 volt operation, the maximum value of resistance is 20 MegaOhms.

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