After finding out that 2 old SOLVINDEN lamps died because of a faulty switch and fixing them, I was curious how does the battery hold up after so many years. Ikea recommends to replace the battery after 2 years, but I never did. All the batteries in the lamp are made in China, but the batteries they sell in the store are made in Japan, so they are different. So let’s put them to the… Continue reading
Intro For a while now, I started replacing the dead AA(A) batteries in my sensor nodes with rechargeable NiMH ones. So, since these batteries are rechargeable, I thought, why not trying adding small solar panels for sensor nodes, where light is abundant. Node 27: outside sensor Purpose: outside temperature, humidity, light, pressure sensor. Powered by 2 x AAA 500mAh from Ikea. The solar cell is rated 3V, 125mA and is pointing vertically south and costs… Continue reading
Update after 3 months The UPS is functioning as it should, and I think the solution is viable as a simple, low cost UPS where it is needed. It was a good mind and build exercise, but there are two reasons why I am not keeping it: First – realistically speaking, electricity fails way too seldom to actually use it. Second, unless I build one of these for each room, I will always have to… Continue reading