Arduino PWM Solar Charge Controller

After building the Arduino based solar charge controller designed bu Julian Ilett of 256.uk and laid out by the person behind arduined.eu I thought I’d like to look again at this project.

I’d had comments from people nervous about the soldering – which I too struggled with.  So many components in such a small space made it tricky.  I wondered if I could redesign the circuit board to make it a little easier.  I also wondered if I could reduce the number of components used in the design.

I came up with this version:

arduino pwm charge controller v2 veroboard v3
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Arduino Voltmeter Clock

As soon as a saw other peoples versions of this clock I knew I wanted to make my own. Using a Arduino Pro Mini (clone) a DS1307 RTC module and three 5 volt  voltmeters I was able to complete the following project in an afternoon.

I now just need to build it into a suitable enclosure.

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Automatic Grid Tie Switch Verision 3.0!

The latest version of my Arduino based automatic grid tie switch is now finished. This improved version includes a new screen which displays more information and now uses an Arduino Nano (clone). Further more I’ve created my own voltage divider to increase the voltmeter resolution. Continue Reading →

Automatic Solar Grid Tie Switch v2.0

I’ve been working on a new version of my automatic grid tie switch.  If you haven’t seen my previous post or video it’s a device which will switch my sheds solar panels from the battery charge controller to a micro grid tie converter depending on the battery voltage.  The idea is I want my solar panels to deliver everything they’ve got for as long as they can each day. Continue Reading →

Automatic Solar Grid Tie Switch v1.1

My solar shed now generates more power than I can regularly use.  I wanted a way to use that excess energy, but ensure my battery was kept fully charged.

I’ve recently bought a couple of Arduinos to have a play with.  They fit this purpose perfectly.  They can run from the battery, but use very little power.  Using a voltage sensor (which is a simple, pre-built voltage divider) and a relay board, I can easily change the relay based on the voltage input.

This is my first project, so please be kind on the code.  I’m still learning!

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