<div dir="ltr"><div>Hi,</div><div><br></div>I have been trying to crunch some numbers and the results seem interesting. I don't claim the calculations to be correct, so if someone with more knowledge (than me or a quick google search) can reply, would be very useful.<br>
<br>The average difference between power consumption of an SSD and a HDD is about 4W. [1][2]<br><br>Now considering the environments we're gonna head into we're looking at typically 1-3 days of power backup for the server (lets average out at 2).<div>
<br></div><div>That means, the battery backup needed is:</div><div>4 * 24 * 2 = 192 W-hr</div><div><br></div><div><b>That comes out to roughly $25-35 in battery costs</b> (again based on quick google searches for battery costs). <b>If you want a longer life from you're battery, you're looking at about $50-60 in battery costs.</b></div>
<div><br></div><div>Now if we're also giving solar backup, based on the calculator here [3] we're going to need about a 25-30W solar panel (for just those 4 extra watts). Again, google tells me that <b>such panels retail for about $65-80.</b></div>
<div><b><br></b></div><div><b>So, on average we'll save $100-$130 on TCO (total cost of ownership), if we intend to provide an SSD as opposed to an HDD, considering the server runs 24x7 and 2 days of backup is needed.</b></div>
<div><b><br></b></div><div>On top of that, you're looking at less failures, a better operating temperature range, and more durability.</div><div><b><br></b></div><div>Disclaimer: I don't claim to be an expert in this area (hence am cc'ing Richard Smith), but this is what some back of the envelope number crunching tells me.</div>
<div><br></div><div>[1] <a href="http://www.storagereview.com/ssd_vs_hdd">http://www.storagereview.com/ssd_vs_hdd</a><br>[2] <a href="http://forum.notebookreview.com/solid-state-drives-ssds-flash-storage/645232-ssd-vs-hdd-power-usage.html">http://forum.notebookreview.com/solid-state-drives-ssds-flash-storage/645232-ssd-vs-hdd-power-usage.html</a><div>
[3] <a href="http://www.batterystuff.com/kb/tools/solar-calculator.html">http://www.batterystuff.com/kb/tools/solar-calculator.html</a>,<br></div></div><div><br></div><div><div><br class="">Best,<br></div><div>Anish</div>
<div><br></div></div><div><br></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Fri, Aug 16, 2013 at 4:55 PM, James Cameron <span dir="ltr"><<a href="mailto:quozl@laptop.org" target="_blank">quozl@laptop.org</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="im">On Fri, Aug 16, 2013 at 12:18:40PM -0500, David Farning wrote:<br>
> However the cost of a SSD is significantly higher than a normal<br>
> drive.<br>
<br>
</div>What's the incremental cost of solar capture and storage for powering<br>
a hard drive compared to an SSD?<br>
<span class="HOEnZb"><font color="#888888"><br>
--<br>
James Cameron<br>
<a href="http://quozl.linux.org.au/" target="_blank">http://quozl.linux.org.au/</a><br>
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</font></span></blockquote></div><br><br clear="all"><div><br></div>-- <br>Anish | <a href="mailto:anish@sugarlabs.org" target="_blank">anish@sugarlabs.org</a>
</div>