Over 40 hydrogen car models from Audi, BMW, Fiat, Ford, GM, Honda, Merc, Peugeot etc

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The Merc F600 hydrogen car can deliver 66 kW of electricity into a power connection while parked in the driveway – enough to power two houses. Given that the average conventional car engine can produce from 50 to several hundred kW today, it is to be expected that hydrogen cars will be able to store huge amounts of electricity which could be used to provide backup to the electricity grid, in an era when green electricity is the dominant source of electricity.

This website provides an overview of the work in progress, model by model:

http://www.hydrogencarsnow.com/mercedes-f600-hygenius.htm

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blackbox

...but would you want to supply the grid with your reserve?

In reality, if power on the grid was low, this is the time when you would want to hold on to your reserves as there might not be enough available to recharge it when you wanted to go for a drive.

I suppose if the grid were to pay the Mercedes owner a premium he might see it as a source of revenue.

However, if this is the way things were going, you would probably better to have a fuel cell without the car attached - i.e. if the grid owner would pay you for storing energy.

bonkey

The maximum KW figure for the engine is mostly useless without knowing the KWh storage capacity.

Older Hygenius models (circa 2005) were rated for 1.5 KWh. That would give a whopping 1.5 minutes (approx) of power at almost-full drain of 60KW. Lets assume that the system has improved 100-fold in the last 3 years. That gives 2.5 hours to drain from full to empty...and no, the system hasn't improved 100 fold.

OK..with enough cars, then the load is spread, and you're never really going to be draining 66kw from a car at a time. But then the question has to be asked why the kw rating is worth going on about.

And lets not forget...the more you drain...the more you need to recharge afterwards and you'll have that demand (mostly) coming all at once.