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Lithium Titanate (LTO) battery bank build.
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<blockquote data-quote="hispls" data-source="post: 8658708" data-attributes="member: 614752"><p>Big amp is """rated""" 4000W @ 1 ohm. Might be a little over-rated. (see picture). Not going to speculate too much just in case I ever try to get into a rated power limited class. My fronts amp is 150X6, honestly rated. I did not try burp yet, but I went very hard on it with music for a while. Use that would drop me over 2V before is dropping only .2V. Anyway, what I was doing was far more strenuous than 3 second burp. That will get a bit worse when it starts getting sub-freezing up here but as the cells warm up from use and just running the heater they should perform as normal with some use. </p><p></p><p></p><p>If you wanted to worry about it, charge 6S banks individually to equal voltage resting then parallel them up. In the series they will share the charge equally. Cells would want to be checked individually for matching voltage. Not sure if or how much testing parallel banks would show if one cell was self discharging or weak.</p><p></p><p>Otherwise, that's about the size of it. You will want to remove any AGM batteries in your vehicle, they will be very parasitic.</p><p></p><p></p><p>I wouldn't hold my breath. At this point if they could even make 3V cells they'd be doing it. All these super storage high current technologies (supercaps, fancy batteries) seem to be voltage limited. Even the old technology is low voltage cells..... your standard lead acid/agm/etc. car battery is just 6 2V cells still. Consider also from manufacturing standpoint end users of batteries want all kinds of voltages so if you only made a 12V cell you'd lose the business of everybody who needed 2, 4, 6, 8, and 10V supplies. Yes series-ing piles of cells is inconvenient for complexity but offers more flexibility and of course if you really cared you could use some monitoring or smart charging to keep an eye on things and replace only cells as needed.... replace only one cell out of a 6 cell bank if only one dies. A lot of consumer electronics die prematurely because just one cell goes out. I know a guy who used to get used batteries from wherever he could, carve them open and just save the cells that are still good for projects. </p><p></p><p></p><p>If you want to really be safe do just 6S and charge each 6S set separately. Consider these jokers are probably sitting in a warehouse for a while before they ship, they spend a month and a half on a boat/truck to get to you, so if they're all holding within a couple hundredths of a volt when they get to you they're probably pretty solid. I'd expect an unhealthy cell would rest different or self discharge way out of line with the rest of them.</p><p></p><p>[ATTACH]1646[/ATTACH]</p></blockquote><p></p>
[QUOTE="hispls, post: 8658708, member: 614752"] Big amp is """rated""" 4000W @ 1 ohm. Might be a little over-rated. (see picture). Not going to speculate too much just in case I ever try to get into a rated power limited class. My fronts amp is 150X6, honestly rated. I did not try burp yet, but I went very hard on it with music for a while. Use that would drop me over 2V before is dropping only .2V. Anyway, what I was doing was far more strenuous than 3 second burp. That will get a bit worse when it starts getting sub-freezing up here but as the cells warm up from use and just running the heater they should perform as normal with some use. If you wanted to worry about it, charge 6S banks individually to equal voltage resting then parallel them up. In the series they will share the charge equally. Cells would want to be checked individually for matching voltage. Not sure if or how much testing parallel banks would show if one cell was self discharging or weak. Otherwise, that's about the size of it. You will want to remove any AGM batteries in your vehicle, they will be very parasitic. I wouldn't hold my breath. At this point if they could even make 3V cells they'd be doing it. All these super storage high current technologies (supercaps, fancy batteries) seem to be voltage limited. Even the old technology is low voltage cells..... your standard lead acid/agm/etc. car battery is just 6 2V cells still. Consider also from manufacturing standpoint end users of batteries want all kinds of voltages so if you only made a 12V cell you'd lose the business of everybody who needed 2, 4, 6, 8, and 10V supplies. Yes series-ing piles of cells is inconvenient for complexity but offers more flexibility and of course if you really cared you could use some monitoring or smart charging to keep an eye on things and replace only cells as needed.... replace only one cell out of a 6 cell bank if only one dies. A lot of consumer electronics die prematurely because just one cell goes out. I know a guy who used to get used batteries from wherever he could, carve them open and just save the cells that are still good for projects. If you want to really be safe do just 6S and charge each 6S set separately. Consider these jokers are probably sitting in a warehouse for a while before they ship, they spend a month and a half on a boat/truck to get to you, so if they're all holding within a couple hundredths of a volt when they get to you they're probably pretty solid. I'd expect an unhealthy cell would rest different or self discharge way out of line with the rest of them. [ATTACH]1646._xfImport[/ATTACH] [/QUOTE]
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