Slashdot is powered by your submissions, so send in your scoop

 



Forgot your password?
typodupeerror
×

Comment Re:This again? (Score 5, Insightful) 480

More like tests keep showing that it IS working, and nobody is sure why. Either the problem is with the test, or there's something else happening that we don't understand, but either way, nobody is sure yet what's going on.

I think it's likely that the test is faulty, but they need to figure out why or how the test is faulty.

Comment Re:2kW isn't enough power for a home (Score 1) 514

The round trip power loss in the batteries is 8%. The charging efficiency isn't relevant, because solar during the day would be wasted/lost anyhow. If we assume the discharge loss is half that at 4%, then instead of getting 7 kWh per day, you're getting 6.72 kWh per day. It would still take around 6 years to pay off. Just 6.1 years instead of 5.9 years.

A far bigger impact would be loss in capacity over time.

Comment Re:2kW isn't enough power for a home (Score 1) 514

It depends on how much you pay for power. Say you pay $3000 (it'd be more after the installation costs and markup, but let's just pick that). That lets you move 7 kWh of power from off-peak (when you're not using it) to peak (when you need it). You're therefore saving 7 kWh per day that would otherwise be pulled from the grid. Say you're paying $0.20 per kWh. You would save $511 per year, so the battery pack would pay for itself after roughly 6 years. The remaining four years, it's actual savings.

Of course, the cost would be more than $3k, and who knows what your power company charges. Mine charges way less than $0.20, but I've got one of the lowest power costs in the world, so it's not really a good comparison to a place like California.

Slashdot Top Deals

The one day you'd sell your soul for something, souls are a glut.

Working...