Off The Grid
Video
This is used for soundproofing but it also works for stopping thermal conductivity.
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https://pvwatts.nrel.gov/pvwatts.php
You can plug your address into PVwatts, tell it the kW of solar panels, look in the advanced section and put in your DC-AC ratio, and it'll use historical cloud cover for your area to make predictions for solar production. How accurate is it? I plugged in my system and it gave me results broken down by month. December should see 100.55kWh per day and according to my own calculations, I'm averaging 99.59 per day since Dec 1. I'll call that a win.
Europeans: use this link https://re.jrc.ec.europa.eu/pvg_tools/en/
A note about DC - AC ratio. If you look under advanced parameters, you'll find DC to AC size ratio. One on my arrays has 19.5kw of solar with 15.8kw of inverters. That's 1.23. Another array has 11kw of solar with 6kw of inverters and that is 1.83. Be sure to select ground or roof mount and bifacial in the advanced section. Everything else is pretty much good to go.
You can plug your address into PVwatts, tell it the kW of solar panels, look in the advanced section and put in your DC-AC ratio, and it'll use historical cloud cover for your area to make predictions for solar production. How accurate is it? I plugged in my system and it gave me results broken down by month. December should see 100.55kWh per day and according to my own calculations, I'm averaging 99.59 per day since Dec 1. I'll call that a win.
Europeans: use this link https://re.jrc.ec.europa.eu/pvg_tools/en/
A note about DC - AC ratio. If you look under advanced parameters, you'll find DC to AC size ratio. One on my arrays has 19.5kw of solar with 15.8kw of inverters. That's 1.23. Another array has 11kw of solar with 6kw of inverters and that is 1.83. Be sure to select ground or roof mount and bifacial in the advanced section. Everything else is pretty much good to go.
pvwatts.nlr.gov
PVWatts - NREL
Estimates the energy production and cost of energy of grid-connected photovoltaic (PV) energy systems throughout the world
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Forwarded from The Deer Blind (Eighty🍁Canadian)
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Orchard Drones. They're taking our jobs!
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Forwarded from Ancaipira
Here on this website you have everything you need to know and you can even contact them and they will guide you in the best possible way and they have spectacular micro hydroelectric plants, both for on grid (asynchronous) and off grid or hybrid systems with (permanent magnet generator)
https://h-hydro.com/
https://h-hydro.com/
Hartvigsen Hydro
Micro Hydro Power
We are a worldwide supplier of micro hydro components including turgo runners, housings, nozzles and generators.
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Parenting boys.... tricycle motors and curtain climbers
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https://www.youtube.com/shorts/1OKaC0hPxjc and don't forget to season the pan with some lard.
YouTube
Polishing Cast Iron
Source: Bviral
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Forwarded from HickTown (Hammer)
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Amp Interruption Calculation_Tech_Lib_Electrical_Formulas.pdf
446 KB
Dont know who might need this, but here's the formula for calculating the amp interruption rating needed for a main breaker from your utility service. I wrote this spread sheet a few years ago. Originally my solar system had a shutoff that killed the backfeed from the solar inverters. But since I've reorganized my system, that switch has been bypassed. Next week I'll be routing my service entrance cabling from the meter base thru a 100amp lockable shut off switch. It is required by code to have a lockable shut off when backfeeding the grid. Since I can't separate my solar, I'll just separate the whole house.
Basically, at 25kva transformer can deliver 100amps @ 240vac but in the case of an arc fault, it could deliver 8000amps of surge. If you have a longer feeder like I do (275ft), resistance of the wires to the pole will limit that current. So my limit is 2916amps. This is well within the limits of the fused knife switch and the 1 AWG cable I'll be using.
Basically, at 25kva transformer can deliver 100amps @ 240vac but in the case of an arc fault, it could deliver 8000amps of surge. If you have a longer feeder like I do (275ft), resistance of the wires to the pole will limit that current. So my limit is 2916amps. This is well within the limits of the fused knife switch and the 1 AWG cable I'll be using.
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Most of us have heard of fast fuses and slow blow fuses. But did you know breakers can also be fast and slow rated?
Here's the rating curve designations for circuit breakers. All of them will handle 100% of their rated current forever, but D type will handle 20x its rating for 1/2 a second. Z rated breakers will always trip instantly at 2x their rated current. So D is slow blow and Z is fast.... and all ratings between.
Now you know.
Here's the rating curve designations for circuit breakers. All of them will handle 100% of their rated current forever, but D type will handle 20x its rating for 1/2 a second. Z rated breakers will always trip instantly at 2x their rated current. So D is slow blow and Z is fast.... and all ratings between.
Now you know.
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The majority of breakers trip for thermal and magnetic reasons. Thermal happens when you are just barely over the current rating and eventually the breaker trips. Magnetic is when there's a short circuit and a strong magnetic field is generated tripping a cam inside. Additionally there are GFCI breakers that measure the amps in/out of the hot and neutral wires. If the amps aren't exactly the same that means that there is someone getting shocked or something has shorted to ground. if there's an imbalance of 5ma they will trip. So if you have 20 amps going out on the hot and 19.095amps returning on the neutral, the breaker will trip.
https://www.youtube.com/watch?v=VGj32euYZ2c
https://www.youtube.com/watch?v=VGj32euYZ2c
YouTube
Circuit Breaker Basics - How do they work?
In this video, we'll discuss the basics of circuit breakers. We'll cover the types of circuit breakers and their uses, as well as the different types of circuit protection. After watching this video, you'll be able to understand and use circuit breakers effectively…
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Forwarded from Before Our Time
Off grid air motors. They use a gas engine and/or windmill to make compressed air. They run sewing machines, drill presses and ceiling fans from compressed air.
Join us now: Before Our Time📜
Join us now: Before Our Time📜
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Forwarded from Working Men Memes (Hammer)
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Forwarded from Sharky’s Basedposting Channel - TG Microceleb (SHARKY)
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