Comments on: The Return of Battery Back-Up Solar http://www.getsolar.com/blog/the-return-of-battery-back-up-solar/3382/ Get the latest news on solar homes, solar panels & renewable energy Tue, 18 Oct 2011 07:47:25 +0000 hourly 1 http://wordpress.org/?v=3.2.1 By: Tweets that mention Return of Battery-Back Up Solar | GetSolar.com Blog -- Topsy.com http://www.getsolar.com/blog/the-return-of-battery-back-up-solar/3382/comment-page-1/#comment-1845 Tweets that mention Return of Battery-Back Up Solar | GetSolar.com Blog -- Topsy.com Sat, 30 Jan 2010 02:15:49 +0000 http://www.getsolar.com/blog/?p=3382#comment-1845 [...] This post was mentioned on Twitter by GetSolar.com, Mike Stewart, Solar Energy News, Batteries Plus, Energy Solutions and others. Energy Solutions said: Found this 4 You The Return of Battery Back-Up Solar http://bit.ly/95Iiq2 [...] [...] This post was mentioned on Twitter by GetSolar.com, Mike Stewart, Solar Energy News, Batteries Plus, Energy Solutions and others. Energy Solutions said: Found this 4 You The Return of Battery Back-Up Solar http://bit.ly/95Iiq2 [...]

]]> By: Margaret Collins http://www.getsolar.com/blog/the-return-of-battery-back-up-solar/3382/comment-page-1/#comment-1843 Margaret Collins Fri, 29 Jan 2010 20:04:33 +0000 http://www.getsolar.com/blog/?p=3382#comment-1843 Deep cycle battery "storage" actually<em> is</em> measured in amp hours, ECD. It's true that it's better referred to as "capacity" but when referring to new technology on the market, one sticks with what one reads in the press release; the use of the word "storage" is just shorthand for a more useful measure in this sense. Watts of course are a measure of power, equal to voltage multiplied by electrical current (or amperage). Watt-hours express the relationship between power and time: when my 1 kilowatt solar array produces energy for 1 hour, we call that one kilowatt-hour (let's stick with theory here, not inefficiencies etc). Amp-hours, similarly, express the relationship between current and time: 1 amp supplied continuously to a load for one hour is 1 amp-hour. Deep cycle battery “storage” actually is measured in amp hours, ECD. It’s true that it’s better referred to as “capacity” but when referring to new technology on the market, one sticks with what one reads in the press release; the use of the word “storage” is just shorthand for a more useful measure in this sense.

Watts of course are a measure of power, equal to voltage multiplied by electrical current (or amperage). Watt-hours express the relationship between power and time: when my 1 kilowatt solar array produces energy for 1 hour, we call that one kilowatt-hour (let’s stick with theory here, not inefficiencies etc). Amp-hours, similarly, express the relationship between current and time: 1 amp supplied continuously to a load for one hour is 1 amp-hour.

]]> By: uberVU - social comments http://www.getsolar.com/blog/the-return-of-battery-back-up-solar/3382/comment-page-1/#comment-1839 uberVU - social comments Fri, 29 Jan 2010 07:25:17 +0000 http://www.getsolar.com/blog/?p=3382#comment-1839 <strong>Social comments and analytics for this post...</strong> This post was mentioned on Twitter by GetSolar: New blog post: The Return of Battery Back-Up Solar http://www.getsolar.com/blog/the-return-of-battery-back-up-solar/3382/... Social comments and analytics for this post…

This post was mentioned on Twitter by GetSolar: New blog post: The Return of Battery Back-Up Solar http://www.getsolar.com/blog/the-return-of-battery-back-up-solar/3382/...

]]> By: ECD Fan http://www.getsolar.com/blog/the-return-of-battery-back-up-solar/3382/comment-page-1/#comment-1833 ECD Fan Thu, 28 Jan 2010 21:19:56 +0000 http://www.getsolar.com/blog/?p=3382#comment-1833 Storage is measured in Watt-hours, not in amp-hours. How much would a 3,000-amp hour (or 36 kWh in capacity, assuming 12V) battery cost, before ITC and other incentives? By the way, that battery would be barely enough for 2 kW off-grid system (as solar generates, on average in California, less than 4 hours a day at peak capacity - 1 KW-rated PV system typically generates less than 1460 kWhs AC a year there). Storage is measured in Watt-hours, not in amp-hours. How much would a 3,000-amp hour (or 36 kWh in capacity, assuming 12V) battery cost, before ITC and other incentives? By the way, that battery would be barely enough for 2 kW off-grid system (as solar generates, on average in California, less than 4 hours a day at peak capacity – 1 KW-rated PV system typically generates less than 1460 kWhs AC a year there).

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