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The cost of a professionally installed PV system varies by location and by the amount of PV installed. With these numbers you might be able to better negotiate a price for your roof. Pricing is always changing over time and these tables were from 2018, so your mileage may vary. Other...

Sunday morning with a cup of coffee and like many of you thinking about my bills. The power bill specifically and wondering what the price point per kWh needs to be to consider going off-grid. Let's tempt the calculator gods.... The electricity portion of my monthly power bill says the rate...

I really like the convenience of my cordless vac. I really like the power of my 1100 W corded Vac. Then I was looking at the 400 Wh Jump Peak Start converted to LiFePO4... Pity the inverter isn't big enough to try it out.... I know I have duct tape around here somewhere...

How do you clean your panels? Got a tip for cleaning or maintaining panels? How do you deal with tree sap, gunk or other corrosion that happens? Post it here! In general panels at greater than 10° tilt are self-cleaning [ref], but even then they might need the occasional cleaning. So...

reference 1, reference 2 Some states have already done away with net metering, or changed the rates to where you get next to nothing for the excess power you generate. Now, the The New England Ratepayers Association (NERA) has filed petition with the Federal Energy Regulatory Commission (FERC)...

What's the difference between the two (other than price, Toroids are around $0.30/each)? Curious if they can be used as a poor-man's CT for simple projects not requiring high-accuracy, they seem to be about 50x less expensive.

Goodbye 2021! You were an odd year! :rolleyes:

Used to have a waterbed in a house with no AC. In the winters if was great to crawl into because it was warm, in summer it was great because it was cool. The only bad time was just after filling the waterbed, it was waaaay to cold to sleep on then. But what about a power outage? Could it be...

Burr Vs. Hamilton - State Vs Federal rights Edison Vs. Tesla - Age of Energy Ford Vs. Dodge - Corporations as legal entities Wright Vs. Langley - Age of Flight Gates Vs Jobs - Age of Computers Musk vs. Besos - Age of Space flight Musk vs. Besos - Age of AI Musk vs. Barra - The death of ICE Musk...

ref MIT has built a microprocessor from nanotube field-effect transistors. A 16-bit microprocessor based on the RISC-V instruction set and comprises more than 14k complementary MOS CNFETs. This technology allows far greater speeds and yet uses 10x less energy.

Saw a thread talking about Sol-Arc's ferrites for EMP protection and wanted to get some discussion on Ferrites for Lightning and/or EMPs. Haven't seen any EMPs hit around here, but we sure do get a lot of lightning. Ideally the goal of this thread is to get enough knowledge that someone would...

While I don't think the youtuber is purposefully misleading (he even caveats a few times with the "if the reports are true"), the research being reported on does sounds bogus, but thought I'd post it...because way cool if true.

If you haven't heard of Battery Day, then you're probably a normal person. No guarantees though. If you know all about battery day, you should think about getting out more. I'm going to go ?. Battery day is 9/22 and its the hype around Musk's upcoming event where he's said, "Battery Day...

Based on advice from the old forums (you know, a couple of days ago ;-) I went ahead and ordered this, I'll let you know how it works:

We've probably all heard to store LiFePO4 at around 45% SoC. Anyone seen a chart that indicates bad thing vs. storage SoC? I'm guessing the bad thing is a softening of the electrodes measured in reduced capacity independent of cycle-life. The reason I ask is I have LiFePO4s that are...

Flywheel Energy Storage Flywheels with magnetic bearings are 97% efficient, have an 85% round trip efficiency, are not adversely affected by temperature, have high C-Rates, zero degradation (do not degrade over time based on DoD or C-Rate), unlimited cycling, are made of inert/benign materials...

What can we do as individuals to help slow climate change? Please post your ideas. Note: Please do not disrupt this thread with if climate change is real or not, there are other threads to discuss that. If someone is childish enough to do that, please do not respond. Just report it and ask...

Basically, instead of air in concrete (aircrete), he's using ground-up styrofoam (which is a hoot how he makes it). Love to see psi strength, weight, & R-value Vs. % by volume of styrofoam.

We don't really have a forum for this... but without smoking anything my brain crossed the "instant snow" from the PCM thread and a Gravity Energy storage device to come up with a way to combine solar and wind power: Here's how it works. Imaging a weight suspended high on a cable...as...

Photovoltaic System Grounding Grounding Photovoltaic Modules: Issues and Recommendations The Ground-Fault Protection Blind Spot: Safety Concern for Larger PV Systems in the U.S. Grounding Photovoltaic Modules: The Lay of the Land Importance of a single connection to earth-ground

3:50 am EDT we hit the autumn equinox!

MAJOR FLARE WARNING: Sunspot AR2860 is big, angry, and it's directly facing Earth. The active region just unleashed a significant M4.7-class solar flare (Aug. 28 @ 0611 UT), probably hurling a CME toward Earth: movie. If current trends continue, a major X-flare could be in the offing, so stay...

TL;DR: Any good books on climate change that includes the role of water vapor (the most powerful greenhouse gas)? So, I’m what some would call a climate denier... and hey, back when this started I was right that Florida wouldn't be underwater by 2020. ;) But perhaps I’m just a climate...

The forums have been an eye opener for me seeing the issues in places like Hawaii and down-under from posts of guyman and colin.timms; take a look at Colin's bill. Coverted to USD that's even over what Hawaii has. It's happened there, it's happened in Hawaii, can it happen here? From an ABC...

This was interesting, wonder if they teach ethics in chemistry now?

As the recession takes hold and oil prices plummet, will solar prices plummet too? Seems to be the case as one member reports: From: https://www.greentechmedia.com/articles/read/one-response-to-the-coronavirus-giving-solar-away-for-free Will this herald in a new age of residential solar...