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Knackered_lot t1_iqqrudr wrote

Reply to comment by [deleted] in The US's National Renewable Energy Laboratory wants to make decentralized microgrids as simple to set up and operate as diesel generators, and has created a prototype that is much simpler than existing microgrid technology. by lughnasadh

Where do you get this 90% efficiency from? I have heard the batteries used for the grid have been tested to produce 1KW for every 3KW stored

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[deleted] t1_iqqwxrf wrote

[deleted]

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Knackered_lot t1_irxl9gk wrote

Yeah maybe for things like phone batteries. Grid batteries are a whole different beast. A significant amount of KVARs is necessary to run a grid. Batteries don't scale 1:1 when comparing small Lithium batteries to ones that provide power to a grid.

In other words, the inverter necessary to store the energy from AC to DC uses power, and the same vice versa for supplying power. I'm not thinking of hydrogen, just the application of batteries on a grid.

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