Comparing this year’s electricity usage against last year’s – checking whether all my energy use optimizations actually show in the kWh.
Analysis of electricity usage per year
Every μA counts
Every μA counts on battery powered wireless nodes – the hardware and software tricks I use to keep sleep current microscopic.
Cheap DIY power monitor
A cheap DIY power monitor for my father – SCT-013-000 current transformer plus OpenEnergyMonitor resources, momentary and accumulated kWh.
Video of the LTC3108 energy harvesting board with solar cell
Video: the LTC3108 energy harvesting board pulling power from a solar cell lit by a single 23W CFL a meter away.
Using the LTC3108 breakout board with a solar cell
Charging a 1F supercap from a scavenged solar cell through the LTC3108 energy harvesting board – first light, wrong cell, lesson learned.
Hot water usage analysis
Analyzing our hot water usage patterns from heat pump telemetry – no flow meter, just data I was already logging to emonCMS.
Solar water heating in the winter
Winter mode for the evacuated tube solar heater: plumbing disconnected, fingers crossed, electric element on standby against freezing.
E-meter PCB ready
The e-meter PCB arrived and is coming together – a wrong 2×8 header footprint and two missing parts, otherwise looking good.
Solar statistics
Statistics from my 440 Euro 220l evacuated tube solar water heater – what the self-installed rooftop system actually delivers.
Power supply block with ADCs for power monitoring
What does a DIY power monitoring system really cost, and how accurate is it? A power supply block with ADCs, inspired by Dave Berkeley.
Finding good use for excess solar hot water
My 220l solar tank hits 85°C in summer with water to spare – finding good use for the excess hot water and trimming the electricity bill.
Measuring the solar yield
Measuring the actual solar yield of my evacuated tube collector and comparing it against the calculated available energy in emonCMS.
Thoughts on the Solar Energy Calculator
Refining the solar energy calculator – an emonCMS input processor now derives momentary yield from the tank temperature rise.
Calculating the available solar energy and logging it to emoncms
Calculating the Sun’s position and available solar energy for my 2.088m² evacuated tube collector, logged to emonCMS as a baseline.