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SVTPerformance's Chain of Restaurants
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<blockquote data-quote="08mojo" data-source="post: 16358512" data-attributes="member: 132915"><p>You can be totally free from PGE, but it will cost more than $50k. This is NOT the way to design a power system, but for entertainment: How much electricity do you use per month (how many kWh does your bill say you used)? If you want' to completely rely on a tesla powerwal for a month, take your billed kWh and divide it by 13.5. That will tell you the number of powerwalls you will need. But, don't forget that you have to charge those batteries....this is why you do not install a month's worth of batteries. You need to find a balance between stored energy in batteries vs power from solar.</p><p></p><p>We generally design a system to have enough battery storage to support 2-3 days worth of the building's typical electrical needs. Then, we add enough solar to be able to charge the batteries within one day of good sun. It's a lot more complicated than this, but that's the general rule of thumb.</p><p></p><p>Again, the powerwall is a battery. Batteries will hold their charge for a long time. If you charge a battery, it will still be charged 6 months from now. Will it still be 100% full in 6 months? No, but it will be very close. I truly don't understand why you think a battery magically loses power...</p><p></p><p></p><p></p><p></p><p>As long as photons are hitting the panels, they will produce some electricity. On very cloudy and rainy days, we typically see ~15% of power being produced by our solar vs a clear, sunny day. The only time we see ZERO solar production is when the solar panels are blanketed under heavy snow.</p><p></p><p>Here is a system we have in Atlanta. You can see the sunny days (the peaks you see) and you can see the very cloudy and rainy days. Clearly the solar is still producing power:</p><p></p><p>[ATTACH=full]1621111[/ATTACH]</p><p></p><p>What you've seen and heard is wrong. I, personally, have designed and installed off-grid residential power systems. It can be done and it has been done a lot, it is NOT cheap.</p></blockquote><p></p>
[QUOTE="08mojo, post: 16358512, member: 132915"] You can be totally free from PGE, but it will cost more than $50k. This is NOT the way to design a power system, but for entertainment: How much electricity do you use per month (how many kWh does your bill say you used)? If you want' to completely rely on a tesla powerwal for a month, take your billed kWh and divide it by 13.5. That will tell you the number of powerwalls you will need. But, don't forget that you have to charge those batteries....this is why you do not install a month's worth of batteries. You need to find a balance between stored energy in batteries vs power from solar. We generally design a system to have enough battery storage to support 2-3 days worth of the building's typical electrical needs. Then, we add enough solar to be able to charge the batteries within one day of good sun. It's a lot more complicated than this, but that's the general rule of thumb. Again, the powerwall is a battery. Batteries will hold their charge for a long time. If you charge a battery, it will still be charged 6 months from now. Will it still be 100% full in 6 months? No, but it will be very close. I truly don't understand why you think a battery magically loses power... As long as photons are hitting the panels, they will produce some electricity. On very cloudy and rainy days, we typically see ~15% of power being produced by our solar vs a clear, sunny day. The only time we see ZERO solar production is when the solar panels are blanketed under heavy snow. Here is a system we have in Atlanta. You can see the sunny days (the peaks you see) and you can see the very cloudy and rainy days. Clearly the solar is still producing power: [ATTACH=full]1621111[/ATTACH] What you've seen and heard is wrong. I, personally, have designed and installed off-grid residential power systems. It can be done and it has been done a lot, it is NOT cheap. [/QUOTE]
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