On Oct 10, 8:48*pm, Bob Minchin
wrote:
harry wrote:
So what does the panel make about this one?
http://www.aweenergy.com/midnight_sun.php

Have they solved the world's big *energy problem or snake *oil?

I bet it is expensive.
Enough batteries to store 20-30kWh will non trivial.

Say 300v at 100Ah or 25 large car/truck batteries although ordinary car
batteries don't like deep cycle use so traction batteries would be needed..
Maybe 1 or 2 electric cars worth of batteries would do.

Whilst it might not affect the MCS accreditation for your PV system the
leccy board might not be too happy if they knew what you were up to.

You would have to be careful not to use imported power to charge the
batteries on days when the PV generation was low. Same sort of control
system as the solar dump scheme use would be needed. Similarly care
would be needed not to import too much power once the batteries had been
exhausted at night

Again to avoid affecting the accreditation, they would have to use a
second inverter which would add to the cost.

So a stack of batteries, another inverter, a control system and you have
a midnight sun set up costing £4k or so plus installation.

Bob

Well a 15Kwh battery for an electric car is £5,000-£8,000.
I suppose lead acid might be cheaper