Sunday, June 26, 2022

Re: [electricboats] Server Rack Batteries

I can't address server rack batteries from direct experience.  While I suspect they will work from a water-resistant standpoint, a 48V 5kWh model will likely only support 100A continuous discharge, and that will just barely work with the Elco 9.9.  Have you looked at the ePropulsion Navy 3.0 Evo?  I have the 6.0 model on my five-meter power cat, and it works well.  The 3.0 will only need ~62A from your battery, easily handled by a 100Ah LFP battery.  And 100Ah is a common and cost-effective LFP size (in 12V nominal configuration), so four of those in series can be easily assembled into a 48V pack, which is then manageable weight-wise, due to the easy decomposition of the pack into ~30-pound pieces.

When I look at server rack batteries, the one spec that usually jumps out at me is weight.  Due to the steel-case packaging they typically use, their weight is markedly more than that of an equivalent-capacity battery assembled from modules.  Of course individual LFP cells can be used for an even more energy-dense result, as I show in this video:

https://www.youtube.com/watch?v=fmk1_ynLdwI
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