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David Mandell's picture
Marketing & Development, Marshall DC Lighting, LLC

“DC Lighting is the Key to Optimized Microgrid Solutions” (Pacific North National Laboratory, 2020) Marshall 24DC, 48DC and 125DC LED light fixtures 24DC/48DC/125DC LED lighting brings increasing...

  • Member since 2020
  • 26 items added with 12,273 views
  • Jul 21, 2021

Operating solely on DC power electricity, the building will be powered by more than 600 solar panels distributed across the building’s roof, exterior walls, and balconies. Onsite battery storage will be used to cover nighttime power use and power outages, while an ultra efficient air conditioning system will use approximately 4% of the energy of a traditional system...

Matt Chester's picture
Matt Chester on Jul 21, 2021

Really net to see these cutting edge practices all put together. I'm sure these components will make it quite desirable to tenants-- I'm curious what the arrangement will be for tenants regarding utility bill. Will they get no bill and if the month is a net negative energy use for the building the building owner keeps those profits?

David Mandell's picture
David Mandell on Jul 22, 2021

Interesting question with intriguing future implications; I will look into it and advise.

David Mandell's picture
David Mandell on Jul 28, 2021

I followed up with Steve Corcoran, Systems Division Consultant with Sustainble Living Innovations - the Architectual firm working on 303 Battery..."There won’t be an energy bill for tenants regardless of energy production.  Our last 24 unit building in the U District in Seattle has an average unit electrical cost of $5 per month with no solar generation to offset."

Matt Chester's picture
Matt Chester on Jul 28, 2021

That's pretty amazing, I hope to see this model replicated elsewhere. Thanks for the follow up, David

Jim Stack's picture
Jim Stack on Jul 23, 2021

With very efficient LED lighting I can't imagine DC lighting would be a big savings in comparison. It seems all the separate DC wiring and special bulbs and fixtures would cost more. You still need to AC wiring for all the everyday things people have and plugin like a vacum cleaner, coffee pot, copy machine, computers etc.

   I would like to know more about the super efficient air conditioning equipment.  What brand is it ? When SEER rating does it have?

David Mandell's picture
David Mandell on Jul 28, 2021

I followed up with Steve Corcoran, Systems Division Consultant with Sustainble Living Innovations - the Architectual firm working on 303 Battery...

"All fixtures today are DC fixtures.  Nothing special here.  What happens when you remove AC drivers to convert AC electrical into DC to drive these fixtures it simplifies the lighting network and reduces conversion losses (AC to DC energy conversion waste).  Planning and designing a complete DC lighting system reduces capex cost as it removes the expense for AC infrastructure (panels, breakers, conduit) by running Class 2 wiring.  It also eliminates AC electrician time on site for lighting.  Overall we are seeing a 35% savings in our lighting budget using the same fixtures you would use in an AC driven solution.   The big add on for us is individual addressing of all light fixtures.  This gives us visibility to the lighting network on a per fixture basis which benefits OPEX reductions.  The DC infrastructure also supports all networks required in the building. (security, internet, public safety, access control, Wi-Fi, internet.   If we have one infrastructure to support many systems we increase our savings."

"AC courtesy plugs are required by code so there is no change here.  We hope this will change over time.   Our plan is to remove as much load off of the AC plant as possible.  Vacuums and coffee makers are low draw appliances.  We are focusing on more efficient DC driven dryers, fridges and stoves, HVAC. Our in unit AC is a custom fan coil unit from Williams.  I don’t have the details on the rating but can get it.  We are in the design stage of making this FCU DC driven as well."

David Mandell's picture
Thank David for the Post!
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