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<blockquote data-quote="hispls" data-source="post: 8791098" data-attributes="member: 614752"><p>Does it though? What's the cost and space equivalent of the same amount of energy storage in lithium batteries?</p><p></p><p> </p><p>The math is 1 Farad = 1 ampere for 1 second at 1V. When you series 2.7V cells you're not multiplying your 3000F rating you're dividing so your 5S bank is 600F</p><p></p><p>Now your 600F bank that you paid what 350$ for? is good for 200A for your 3 second burp.... but not really because the voltage drops almost immediately when you start discharging and you simply can't get anything like 100% of the charge out of that at a useful voltage so figure you'd need at least 2 of those banks to reliably burp a 2000W amp for exactly 3 seconds and not a millisecond more. </p><p></p><p>Furthermore, energy density on supercapacitor is 6-10WH/KG and 60-110WH/KG for Lithium Titanate, so it seems that you would need 10X the mass of supercapacitors to store the equivalent energy of LTO cells (AGM comes in at 30-50WH/KG). Or in short, they just don't store ****-all worth of energy for their cost/weight/volume. </p><p></p><p>What exactly are you trying to do with this build? If you can't articulate precisely what you think super-caps are going to accomplish for you, you probably have no business buying them.</p></blockquote><p></p>
[QUOTE="hispls, post: 8791098, member: 614752"] Does it though? What's the cost and space equivalent of the same amount of energy storage in lithium batteries? The math is 1 Farad = 1 ampere for 1 second at 1V. When you series 2.7V cells you're not multiplying your 3000F rating you're dividing so your 5S bank is 600F Now your 600F bank that you paid what 350$ for? is good for 200A for your 3 second burp.... but not really because the voltage drops almost immediately when you start discharging and you simply can't get anything like 100% of the charge out of that at a useful voltage so figure you'd need at least 2 of those banks to reliably burp a 2000W amp for exactly 3 seconds and not a millisecond more. Furthermore, energy density on supercapacitor is 6-10WH/KG and 60-110WH/KG for Lithium Titanate, so it seems that you would need 10X the mass of supercapacitors to store the equivalent energy of LTO cells (AGM comes in at 30-50WH/KG). Or in short, they just don't store ****-all worth of energy for their cost/weight/volume. What exactly are you trying to do with this build? If you can't articulate precisely what you think super-caps are going to accomplish for you, you probably have no business buying them. [/QUOTE]
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