<div style="color:black;font: 12pt Arial, Helvetica, sans-serif;">Alan,
<div>Nuytco built a bunch of lithium equipped DW3000s for Russia.The weight and charge rates were astonishing. As was the price, apparently. I wonder how those battery banks are holding up now that they are in the field.</div>
<div>Vance</div>
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<div style="font-family:helvetica,arial;font-size:10pt;color:black">-----Original Message-----<br>
From: Alan via Personal_Submersibles <personal_submersibles@psubs.org><br>
To: personal_submersibles <personal_submersibles@psubs.org><br>
Sent: Wed, Apr 8, 2020 9:21 pm<br>
Subject: [PSUBS-MAILIST] Lithium Batteries<br>
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<div>I have been watching the progress of lithium sulphur & other new lithium
<div>battery technologies & they seem to be inching closer to commercialisation </div>
<div>with a few break throughs recently.
<div>There are figures of 700 W/L ( Watts per Litre) being touted.</div>
<div>Lead acid have an energy density of 80 W/L & they recommend not discharging</div>
<div>them below 50%, so 40 W/L. Lithium batteries have a depth of discharge of 80% </div>
<div>so in the case of the 700 W/L battery that would be 560 W/L available.</div>
<div>This means 14 X more power available for the same amount of space using the</div>
<div>new lithium technology.</div>
<div><a rel="noopener noreferrer" target="_blank" href="https://www.greencarcongress.com/2020/03/20200315-sion.html">https://www.greencarcongress.com/2020/03/20200315-sion.html</a></div>
<div>It might be worth keeping in mind for future builds, as it may make things like</div>
<div>air conditioning & extra or larger motors a more viable consideration.</div>
<div>I know they have always said that the lithium sulphur batteries will be cheaper</div>
<div>than lead acid on a W/L basis.</div>
<div>Below is a chart showing comparisons between lead acid & a standard lithium</div>
<div>ion battery.</div>
<div>Alan</div>
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