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Solar Power



The first two photos are the three solar panel on the shed roof, three different makes, three different sizes and bought off three different guys on ebay.


Four 110AH lorry batteries off ebay, wired up to give 24 volts. The inverter is actually a UPS. An original 256mb raspberry pi organises the switching and logging using the GPIO and some Python code. The Analogue to Digital for measuring voltage and current is done by a PIC Chip but this is due to be replaced with an arduino nano when the raspberry pi is swapped out for an orange pi zero.

Charge controllers

Charge controllers and lots of wires keep the batteries topped up when the sun shines


Most of the stuff in the foreground is using the shelf, the UPS, the raspberry pi and the PIC circuit are integral to the workings though


On the left another PIC chip that independently monitors the batteries and switches back to the grid if the battery voltage drops too low. The solidstate relay on the right is driven by the GPIO of the raspberry pi and drops the grid connection when the sun is shining and the panels are producing free power.

charge controllers

Two cheap charge controllers from ebay, only one of which is in use on the aux panel. The panels are wired so that the biggest and smallest are wired in series and feed the MPPT controller. These are sufficient to power all my computers, routers, modems, monitors etc. etc. when the sun is shining. The other panel is used as an auxiliary to boost the power on dull days.

charge controllers

The MPPT controller. And cobwebs and spiders. These give an indication of the speed of development.


The orange pi zero, arduino nano, voltage regulator and relay board that are going to replace the raspberry pi and the PIC circuit that have been in service for the past five years, as soon as I feel motivated enough to install them...


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