Science

"batteries for a 20KW 1-week off-grid system the other week and it's an insane cost for something that has to be fully replaced every 10 years. "

48V solar panels and charge controller/inverter is about $2500.

High quality 48V 20kW lithium battery cell-packs with individual battery management system is about $4,000 and with a best-in-class charge controller will supposedly last longer than 10 years (although hopefully by 10 years the battery tech would provide a better replacement anyway).

Where is the "insane cost" ?

The "1-week" of an off-grid system depends on the current drawn out of the battery packs and a recirculating system should not draw that much, the flow rate would require what, a 0.25 HP motor pump? It's for bubbling not for a Blendtec.

The bigger problem is weather.  Both power systems (solar and algae) rely on the sun and clear skies.

--
## Jonathan Cline
## jcl...@ieee.org
## Mobile: +1-805-617-0223
########################

On Tuesday, May 17, 2022 at 10:33:43 PM UTC-7 Cory J. Geesaman wrote:

Has anyone attempted an offgrid/renewable energy storage system wherein extra electricity would power lights on a recirculating algae system, which would then be turned into biodiesel and the algae composted for methane to be burned in a generator, then used as fertilizer for more algae in a relatively closed system?  I was looking into batteries for a 20KW 1-week off-grid system the other week and it's an insane cost for something that has to be fully replaced every 10 years.  I've also been fairly unimpressed with the flywheel and gravity storage systems due to sizes involved.  It seems like this whole system could probably fit into something the size of a shipping container and scale quite large and long-term but I haven't found anyone doing it yet.  Would there be any obvious issues with the system I'm missing?

"batteries for a 20KW 1-week off-grid system the other week and it's an insane cost for something that has to be fully replaced every 10 years. "

48V solar panels and charge controller/inverter is about $2500.

High quality 48V 20kW lithium battery cell-packs with individual battery management system is about $4,000 and with a best-in-class charge controller will supposedly last longer than 10 years (although hopefully by 10 years the battery tech would provide a better replacement anyway).

Where is the "insane cost" ?

The "1-week" of an off-grid system depends on the current drawn out of the battery packs and a recirculating system should not draw that much, the flow rate would require what, a 0.25 HP motor pump? It's for bubbling not for a Blendtec.

The bigger problem is weather.  Both power systems (solar and algae) rely on the sun and clear skies.

--
## Jonathan Cline
## jcl...@ieee.org
## Mobile: +1-805-617-0223
########################

On Tuesday, May 17, 2022 at 10:33:43 PM UTC-7 Cory J. Geesaman wrote:

Has anyone attempted an offgrid/renewable energy storage system wherein extra electricity would power lights on a recirculating algae system, which would then be turned into biodiesel and the algae composted for methane to be burned in a generator, then used as fertilizer for more algae in a relatively closed system?  I was looking into batteries for a 20KW 1-week off-grid system the other week and it's an insane cost for something that has to be fully replaced every 10 years.  I've also been fairly unimpressed with the flywheel and gravity storage systems due to sizes involved.  It seems like this whole system could probably fit into something the size of a shipping container and scale quite large and long-term but I haven't found anyone doing it yet.  Would there be any obvious issues with the system I'm missing?