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Post by peter guglielmo on Sept 23, 2015 10:45:22 GMT -8
hi gary and forum members, hope this post finds you all happy and well. i'am currently building gary's design of the inverter using mosfet outputs. the design is using a 1mfd cap. my question is ,can I use a tantalum 1 mfd cap? also are there any comments or suggestions on this project? thank you all. pete g s. florida
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Post by Gary Lecomte on Sept 26, 2015 6:25:16 GMT -8
Hi Pete, mfd was the OLD TERM.
Now it is uf.
Yes that Capacitor Should be a 1 uf, Tantalum Cap.
Why are you building this Inverter?
For What WATTAGE?
Modern Inverters use a High Frequency Switching Power supply, Making them MUCH SMALLER and Lighter in Weight.
These are Not Practical for a Home Built Project, But they are usually not that expensive to just buy one.
If you Want to TALK about this,
The USA is a Free Phone call for me!
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Post by peter guglielmo on Sept 26, 2015 12:30:22 GMT -8
hi gary, thanks for your response, I'am building this inverter so I can charge 18v NiCad tool batteries in my van. how many watts would I need? I know I can buy one, but no fun in that. pg
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Post by Gary Lecomte on Sept 26, 2015 14:32:28 GMT -8
Depends on the Amp/Hour Rating on those batteries.
Or the Wattage of your Charger.
Probably Less than 20 Watts.
And if this is the case, That Microwave Transformer is really an OVERKILL in Wattage, Physical Size and Weight..
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Post by peter guglielmo on Sept 26, 2015 19:03:43 GMT -8
the amp/hr rating is 1.5 to 2a. actually, i'am going to use the mot for a battery charger and will run the inverter on a much smaller transformer. what size transformer would you suggest?
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Post by Gary Lecomte on Sept 27, 2015 5:52:54 GMT -8
I Think your Confusing Actual CHARGING AMPS with an Amp/Hr rating.
If your charger output is 20 Volts and a charge rate of 1.5 Amps, that would be 30 Watts.
If it is 20 Volts and a charge rate of 2 Amps, that would be 40 Watts.
Considering the Inverter's Efficiency, You would probably want a transformer capable of 50 to 60 Watts.
(Older Microwave Transformers are about 700 Watts or more.)
The Bigger Problem is finding a Suitable transformer.
Ideally the Nominal 12 Volt winding Should be Wound Directly on the Iron Core, with the 110 Volt winding Over Top of it or Beside it.
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