Our Watt Inverter

A SIMPLE WAY TO ALTERNATE A DC CURRENT

Well you know how to build the 120 VDC battery bank by now. so now lets go on to understanding and building a way to alternate that 120 VDC to AC.

First I will show you a simple low wattage way to alternate the DC. By using a radio Shack 2 pole double throw 12 vdc relay. The relay is rated at 5 amps so relay contacts will not burn out unless you go over 5 amps. which makes this a good 100 watt inverter. See figure one. the top two input connections you simply connect to the 120 vdc battery bank. use a 5 amp 120 volt diode for the positive side of battery. use a 5 or 10 amp fuse. Use the proper wire size so your wire will not burn up when load is applied. Now connect another of the same to the 2nd output but put the + side to the right and the - side to the left. ( Be sure to use another 5 amp diode and fuse. now when a 12 vdc on and off pulse ( 60 Hz ) is applied to the coil of the relay. this causes the common arm to move up and down, which in turn is alternating the DC current to an AC square wave. You can build this large enough to handle as much wattage as you desire, By building your own large scale homemade 2 pole double throw relay switch. Contacts should be made very large and changeable. They can be made with large bolt head rounded off. this same method can be done with a small low amp relay and by using high amp transformers or SCR's. you will never need to change contacts. The transformer or sCRs take the beating. They will get hot so use a 12 vdc fan to cool them. make sure they are connected to a aluminum heat sink.

Front View of 2pdt relay

COMMON

COMMON

Figure 1

First Input

Second Input

When common lead contacts are in the up position + & - flow through output. and when in the down position it turns off the up position and reverses polarity in the output as - & +. But this is done very fast! at 60 Hz.

The output is 120 VAC 60 hz square wave. a square wave can run many things such as AC motors and such. try it. or if you want a modified 1 20 VAC OUTPUT sine wave which is very close to what you get from the electric company, then you will need to run the 120 VAC through a 3-10 amp transformer 1:1 or you can use transformers to multiply the wattage.

Figure 1

Trafo Untuk Inverter 5000 Watt
12 VDC BATTERY

This is an easy way to pulse the relay to 60 Hz, ( If you do not know how to make a 60 Hz pulse electronic generator. ) Please note that the 2pdt relay can be replaced by using 200 amp x 30 to 70 amp Transistors or SCR's. You use them in the same way as switches. and then use a small low amp 2pdt relay to switch them on and off. This way the SCRs or the power Transistors take all the amperage punch! and you wont have to worry about your contacts burning out.

Front View of 2pdt relay

Figure 1

THIS IS WHAT A RELAY LOOKS LIKE

CONTACTS

SPRING

Figure 1

SPRING

12 VDC coil 75 ma electromagnet

SIDE VIEW OF 4 PDT RELAY

Getting Started With Solar

Getting Started With Solar

Do we really want the one thing that gives us its resources unconditionally to suffer even more than it is suffering now? Nature, is a part of our being from the earliest human days. We respect Nature and it gives us its bounty, but in the recent past greedy money hungry corporations have made us all so destructive, so wasteful.

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