Julian on April 5th, 2013

I keep coming back to the idea of an MPPT Solar Charge Controller. It would be the maximum power point tracking version of the PWM5. But there’s an idea buzzing around inside my head which I have to research before I can begin the design process. It’s the thought that there might be a coincidence [...]

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Julian on November 21st, 2010

I was asked recently if the PWM5 can be used in a 24 volt system. If the 24 volt battery is actually two 12 volt batteries (connected in series) then the answer is a qualified yes. Qualified because this can’t be done with a single solar panel. The diagram shows how it should be configured. [...]

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Julian on May 12th, 2010

The charge controller project has largely exited the design and test phase and entered a production oriented period of activity. However, that doesn’t mean there aren’t any design challenges still to tackle.¬†At each stage of production there are processes that take time, and opportunities exist for the design of production aids or ‘jigs’. One such [...]

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Julian on April 14th, 2010

Too great a compromise. That’s the upshot of trying to use two 5.6 volt zener diodes in series instead of a single 9.1 volt diode. The 9.1 volt has a completely stable reverse voltage over a wide range of current. The 5.1 and 5.6 volt zeners are completely different and have a non-linear current/voltage relationship. [...]

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