Measuring AC current

For a recent project I was asked to measure the current from a solar photovoltaic (PV) system. This is a typical request as knowing the current is useful for control systems and for measuring power and energy. This blog post highlights some issues and ideas for measuring current. … more

Expanded scale voltmeter

While working on a wind/PV system in a remote area of the Philippines the need¬†¬† for a voltmeter which showed the system (battery) voltage in detail arose. Only analogue V and A meters were available in the local town. This simple design explains in detail how to convert a low range ammeter into a voltmeter … more