On Apr 26, 7:03*am, wrote:
On Mon, 25 Apr 2011 22:31:55 -0700 (PDT), harry
wrote:

The core issue is energy storage.
Grid tie uses the utility as "storage".
If you wanna operate off-grid, you need some form of local energy
storage.
Unbuffered solar is very unreliable, even when the sun is shining.

I have a golf cart. That is about 1200-1500 A/H of storage, right in
my garage.- Hide quoted text -

- Show quoted text -

Next to nothing in real terms. *And expensive.

It is plenty if the sun can keep the batteries up during the day and I
have modest usage at night. My only interest would be for enough power
to keep a fridge and a water pump going after a hurricane.
Maybe a little extra power for a TV.
That is 9 KWH or so. That is why I was looking at the 2300W system. In
an off grid configuration it would bring my batteries back from dead
in a day with some left over.

Don't confuse battery ampere-hours with Kwh. They are NOT the same
thing,

You need to factor in the battery voltage.
ie multiply ampere hours with the avarage battery voltage over it's
discharge cyle. Then divide by one thousand.
This will give an approximation of the Kwh a battery holds.
You will find that the power batteries carry really is negligable.