311–320 of 341 posts
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The price of PVs has fallen by multiple orders of magnitude in the past half century or so[0]. This is a staggering change! [0] http://blogs-images.forbes.com/peterdiamandis/files/2014/09/...
Great comparison of solar price decline along side other fuels: http://i.imgur.com/GCy6EVx.jpg
Quick question for the people living in the US (Target customers of the Powerwall). What is your yearly power usage? On the website[0] they put for sizing 10kWh/day/BR. Which means 14600kWh/year for a 4 bedroom house. Here in Germany, working from home with a 4BR+office house, we are using 2550kWh/year. So, I suppose the Tesla sizing is to support a "peak day" usage, but still, I am surprised by the calculations. Thi…
We don't own the house so there's not much we can do about it. The windows aren't really insulating at all, and there's one old gas heater that doesn't work, although even when it did it all the heat just went straight up the stairs.
In the summer the upstairs gets extremely hot. But our rent is very cheap compared to other places in the bay area, so we are afraid to bother the landlord about these things. #freemarket
Quick question for the people living in the US (Target customers of the Powerwall). What is your yearly power usage? On the website[0] they put for sizing 10kWh/day/BR. Which means 14600kWh/year for a 4 bedroom house. Here in Germany, working from home with a 4BR+office house, we are using 2550kWh/year. So, I suppose the Tesla sizing is to support a "peak day" usage, but still, I am surprised by the calculations. Thi…
We don't own the house so there's not much we can do about it.
I have no particular desire to sign up just to watch the video, but I hope that the Powerwall 2 is compelling enough to beat out the LG Chem RESU. For reference, the RESU is a wall-mounted Li-ion battery meant to be connected to a solar inverter. It seems to beat the Powerwall in basically every respect. It's a bit cheaper, it has a better warranty, and it has slightly lower advertised capacity but higher warranted c…
If no one knows about it, doesn't really matter what the specs are. If you can't market a product it might as well not exist. I mean, congratulations on the engineering I guess.
Quick question for the people living in the US (Target customers of the Powerwall). What is your yearly power usage? On the website[0] they put for sizing 10kWh/day/BR. Which means 14600kWh/year for a 4 bedroom house. Here in Germany, working from home with a 4BR+office house, we are using 2550kWh/year. So, I suppose the Tesla sizing is to support a "peak day" usage, but still, I am surprised by the calculations. Thi…
Interesting to compare different countries. Helsinki, Finland here. Roughly 2100kWh/year. 2 people, a flat with 2 rooms + kitchen. We have district heating. Several laptops in the house, frequent home cooking, most lights are LED based, no sauna inside the apartment. We don't pay any attention to manually saving electricity, i.e. turning off lights etc. Our electric company provides a comparison report on their web s…
Quick question for the people living in the US (Target customers of the Powerwall). What is your yearly power usage? On the website[0] they put for sizing 10kWh/day/BR. Which means 14600kWh/year for a 4 bedroom house. Here in Germany, working from home with a 4BR+office house, we are using 2550kWh/year. So, I suppose the Tesla sizing is to support a "peak day" usage, but still, I am surprised by the calculations. Thi…
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I think you're right about house sizes, but there are a lot of the US that needs both summer AC and winter heating - like the midwest, the north east, and probably the west coast east of the mountains (inland Washington, Oregon).
Do people need air-conditioning or is it just a luxury? I guess now the globe is heating up there is more need for one, but I've always thought of it as borrowing from the future a little, a viscous cycle. More AC, More emissions, needs more AC. I'm in Indonesia right now and sure the houses are built for the tropics but with locals, AC is rare and people manage to get plenty of good sleep and have loads of energy.
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Actually, that UI is pretty much exactly what I had in mind. All devices that control their own charging should have that "trip" switch. It's a shame that Android does not have an API to customize charge depth like that. I occasionally spend some idle thought on wondering how difficult it would be to overcome this limitation with a bluetooth-controlled charger. Well, I'm not an electrical engineer and "bringing the j…
Most decent smartphones are already doing battery management and avoiding extreme draining or charging of the cells. Think about it this way: If your phone has 8 hours of use, chances are the battery could really give you 9 or 10 hours if it was fully charged, but the manufacturer is software limiting it to prolong the life of the battery.
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What is HOA?
Crazy US shit, never heard of it anywhere else. Basically a group of your neighbours who say what you can and cant do to your own property.
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Tesla version integrates the inverter and has double the capacity(14kwh) for the same cost as LG Chem REsu 9kwh version One 14 kWh Powerwall battery $5,500 Installation and supporting hardware starts at $1,000
Is it a string inverter? Is it compatible with DC optimizers? Can it provide backup power in the event of a grid failure?
I suppose the main reason for the inverter is to go from DC -> AC.
The Powerwall 1 required an external inverter. What did that inverter do? Converted from the DC -> AC? The Powerwall 1 had DC input? I guess not, otherwise you wouldn't need the external inverter.
So this powerwall converts internally from DC - > AC -> DC (battery)?
It's all very confusing!