So after spending way more time arguing than I should have with people in the comments section of a recent video by @Off-Grid Garage (https://www.youtube.com/watch?v=ypzNH56_aWE) about the need to keep cable losses in mind when doing battery capacity testing in Amp-Hours, I decided to put the matter (hopefully) to rest with this video.
I start by showing a typical discharge curve of a 20Ah LiFePO4 battery. Then I build a test set-up with an 8 meter cable between the battery and a CBA IV battery tester. I use alligator clips and undersized wire to push the current draw to the maximum it can handle with that mess in between. It could pull 8A and the voltage at the tester dropped to 0.5/0.6V (the lowest the CBA IV will allow) and ran this for almost 2.5 hours until the battery was depleted. I then show the results of the amount of Ah and Wh drawn at the end of the test.
In the end, this shows that even with massive losses in the wires and connections (80%!) the Ah rating at the end remains the same and is a good indicator for the capacity of the battery. In other words: voltage, losses, etc. don't matter when you test Amp-Hour capacity - the current flowing is the same everywhere in the circuit. Naturally, the measured Wh at the end of the test are not, because of the losses in the set-up - if you want to measure Watt-Hours, you need to account for losses. This is one of the reasons why battery capacity is given in Amp-Hours: the amount of current a battery can push in a circuit for a given amount of time.
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https://www.youtube.com/watch?v=yfTWO-yf3BU
View over the meadow at the cabin on a calm day. A Crane bird wanders by at 58:54; it might be the same one as in the very first video on this channel. The shoreline is just beyond the view. Te clouds are high up and moving away, while lower clouds are forming and disappearing over the sea.
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https://www.youtube.com/watch?v=wTxvmAnyehQ
As some of you know, I spend a lot of time and effort (and money) to try and prevent clear cutting patches of forest. I don't mind using trees responsibly, but I don't think clear cutting fits in this. This time I was too late putting in an offer to buy the plot. If you want to help me, please support this channel on LBRY. I'm trying to make a large area in the neighborhood of my cabin go from monoculture forest for harvesting to diverse natural forest again...
This video shows how sunlight conditions in summer and winter for the cabin were simulated in order to get the most light in winter while in summer light is blocked from entering at the middle of the day. The simulation results allowed for optimal placement and in addition, best conditions for solar power.
Winters here are long and dark, so it's important to get as much sunlight as possible. Big windows are great for that, but the disadvantage is that during summer too much sunlight can come in making it uncomfortably warm. The large overhanging roof solves this by letting light in when the sun is at the horizon (doesn't come up more than that in winter, and mornings in summer) while it blocks sunlight in summer. In addition, due to heat losses through windows, the glass is triple pane filled with argon gas to minimize these losses. The roof as well as the floor are very well insulated, minimizing heat losses in winter, while keeping heat out in summer.
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https://www.youtube.com/watch?v=8I9uEqrqOjk
Ever wanted to sit back, listen to the sounds of nature and watch ants build their nest? Well, here you go :)
On a more serious note, I wanted to get things done this weekend on the cabin, but just felt too tired. So I relaxed, put up the hammock, built a fire and recorded these ants working instead. I also found out I much prefer static images and text over making a video to detail a process - so if you want to see part one of the cabin building process, head over to: https://imgur.com/gallery/htCRrKi
If you want an hour long video of a campfire burning, yeah, I have that too... Just ask.
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https://www.youtube.com/watch?v=EyNyHC6iUKo