5 votes

How can I test a variable resistor, while it is still in the circuit board?

102 means it’s a 1kOhm potentiometer (1000). With a good potentiometer you’ll never measure more than 1k between its pins, if the board capacitors are fully discharged. You’ll measure higher than 1k ...
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3 votes

How can I test a variable resistor, while it is still in the circuit board?

If you measure the resistance from the wiper to either end of the track, you should see the resistance drop to zero (or a few ohms) when the wiper is moved to that end of the track. There are failure ...
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  • 5,425
3 votes

How to optimally decide modified square wave duty cycle for an inverter?

There are several considerations that govern the determination of an optimal duty cycle. Firstly, so that resistive loads work with no modification in power, the RMS voltage of the modified square ...
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  • 1,051
3 votes

Why don't inverters use BJTs to easily produce a pure sine wave?

The overarching concern is efficiency. To avoid significant losses you would prefer to have no current with full voltage across the collector and emitter (transistor off), or full current and no ...
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2 votes

Why could a cheap electricity consumption meter break on modified square wave inverter?

Most likely the issue is with the power supply design in the meter. Computers, smartphone chargers and other electronics that require significant amounts of energy use switch mode power supplies ...
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  • 1,051
2 votes
Accepted

Inverter requirements for instantaneous water heater

It would cost far less to install a bottled gas (LNG, propane, etc.) tankless heater such as one of these or these. A 20 kW inverter, alone, is over US$1,000. Using lead-acid batteries, providing ...
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1 vote
Accepted

Are there risks to running one computer with two completely different power sources?

The standard way for handling that is to use a (small) UPS and an ATS. ATS being a fancy word for a (sometimes huge, like more than 100A) relay/contactor assembly that switches between power supplies ...
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1 vote

Can I use mains as backup for off-grid solar system?

Instead of using a generator as backup for consecutive cloudy or rainy days, can I just use household mains instead? Ideally it would be nice to just somehow plug my inverter into an outlet ...
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