291–300 of 311 posts
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Amusing southern California is getting more watts per m2 then A lot of North Africa. This is a good source, population by latitude. http://www.statsmapsnpix.com/2021/11/world-population-by-lat...
It's missing the "most population in smallest (circular) area" view, as defined in https://en.wikipedia.org/wiki/Valeriepieris_circle .
Seems obvious that Norway, Washington State have lots of hydro. Places like Spain and California have lots of steady sun. Scotland, no sun in the winter but lots wind all the time. Those places renewables aren't problematic.
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Sounds great, but are there actual businesses who will come to your home and do an install, or do you need to to become a mad-scientist electrician and DIY? I got quotes on getting an LG system a few years ago and it was 4X these prices (also for me a problem is that my 'ancient' panels from 2013 use a single inverter instead of microinverters, so if I touch the system I have to replace it all). I keep hoping there w…
All of the quotes and interactions I had with the local solar installers were reminiscent of the used car lot if not outright fraud. I was able to do what was permissible myself and a regular licensed electrician did the rest. The equipment is UL listed. There was some learning curve but I found the diysolarforum.com to be a pretty good resource to learn what I didn't know. I ran the whole setup standalone for about…
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You absolutely can do that. You still need a charging controller and a BMS, obviously. But you can avoid the AC round-tripping.
Nice, the 48V batteries I have already have BMS's...any suggestion for a nominal 48V DC optimizer and charge controller?
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Near as I can tell, you literally never even read my comment. So seriously, WTF? You’re doing on this weird rant, when I literally just said average people shouldn’t be assembling their own multi-kWh lithium battery packs unless they want to burn their houses down. Which is, indeed, good advice. And pertinent to the discussion. Where this bizarre tangent you keep going off on is not.
Near as I can tell, you literally never even read my comment. Consider that I explicitly stated: * They build their own ... planes * They build their own ... off grid power system(s) * They ... water proof EV's to drive across harbour floors and you responded that "No, you’re talking about building structures. I’m talking about assembling a bomb." Let me remind you that aircraft are bombs, off grid power systems are…
If you counted them and put them on a distribution, how far off the bell curve do you think they'd be?
In fact, they seem rather extraordinary. If they seem average to you, I'd argue your sense of average is rather extraordinary too.
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> This blog post is all over the place. Which is sad. He has something useful to say, but destroys his credibility by not focusing. Here's the "poster wall" of the organization he claims to head.[1] "Disciplinary convergence through creative story telling". For a much better summary of the subject, see the cover story in this week's Economist. OK, how cheap can batteries get, really? Well, the price of lithium droppe…
Chinese manufacturing seems insanely advanced based on link 5.
It's not the machinery that's advanced. It's the manufacturing chemistry. The real breakthrough here is that the ceramic is deposited as a slurry, and through a series of ovens and dehydrators, it becomes the solid electrolyte. There's no high-pressure sintering press step, as there is in the Fraunhofer lab making solid state battery samples. The process is roll to roll. If that works, the production cost comes way down and the process scales up well.
The next two or three years are going to be very interesting in batteries.
Lifepo4 (lithium iron phosphate) batteries for the home are pretty cheap as of today. Power storage for residential use in a 48v metal rackable linkable system with battery management system (BMS) is $89/kwh shipped/duty paid from reputable chinese suppliers CATL/Seplos etc. You have to wait for sea shipping, add $30/kwh if you want to buy it in the US today. From the same suppliers sodium batteries are currently $13…
We are looking at ordering a lot of these systems in Ukraine to deal with russian attacks on power grid
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When you say $89/kwh, are you talking about just cells, or assembled packs? I’m just about to buy a 5kw Lifepo4 server rack battery from EG4 for a diy project. It’s closer to $220/kwh This is what I’m planning to buy, but you know something better I’d love to take a look. https://signaturesolar.com/eg4-lifepower4-lithium-battery-48...
Do you know if these batteries be used as a replacement for batteries of a lead-acid UPS? I have a Tripp-Lite rack-mount UPS with an extension battery, but its battery has degraded and it can only sustain my computing load for 3-4 hours. It'd be great to replace it with an LFP battery.
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When you say $89/kwh, are you talking about just cells, or assembled packs? I’m just about to buy a 5kw Lifepo4 server rack battery from EG4 for a diy project. It’s closer to $220/kwh This is what I’m planning to buy, but you know something better I’d love to take a look. https://signaturesolar.com/eg4-lifepower4-lithium-battery-48...
There's some very significant additional costs of bus bars & holding racks, but holy heck man EVE LF280K batteries are amazing. Usually 300Ah cells/ Building a big 14s 14kWh serial pack is really not hard, albeit those small hardware costs (bus bars) can add up. Most people don't need that much energy, probably, but these cells are just epic, maybe go 24v if you want less. 8k cycle life makes them good for a much muc…
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My concern would be draining the fuel reserves in a vehicle to power my home reduces my mobility. It seems like mixing objectives and in an emergency, I want to keep my super spare backup if I needed to flee.
So you're worried about a weather emergency that takes out your power, followed a few days later by a second emergency that requires you to evacuate a long distance? I don't think I'd do very much to prepare for that scenario.
I admit it's less efficient to have 2 energy stores, but given we're already discussing potentially life threatening situations, I'm not really looking to optimize for anything except having as many resources as feasible on hand.