Actually, we've found that there are quite a few servers and storage devices available from HP, IBM and others that offer -48V DC input option. As others have mentioned here, using 48V DC in racks can lead to increased availability and power efficiency by reducing overall conversion stages. Combining 48V input IT equipment with a row-based DC UPS make a 48V DC critical bus a practical alternative for future datacenter builds.
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Actually, we've found that there are quite a few servers and storage devices available from HP, IBM and others that offer -48V DC input option. As others have mentioned here, using 48V DC in racks can lead to increased availability and power efficiency by reducing overall conversion stages. Combining 48V input IT equipment with a row-based DC UPS make a 48V DC critical bus a practical alternative for future datacenter builds.