Combining SQFlex PV direct with grid tie [RE-wrenches]

[Kurt Albershardt]

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Thanks -- that looks like it might be the least complicated way to achieve the desired result.

>From p.20 of the product guide:

The IO 101 enables the connection of a generator
supply back-up in case of insufficient solar radiation.
The switching between solar power and generator must
be made manually.
When the generator is stopped manually or runs out of
fuel, the IO 101 will automatically switch to the solar
energy supply.


So they *almost* built what I had planned...





--On Monday, June 18, 2007 9:46 PM +0000 Brad Bassett <bbassett at hei.net> wrote:

>
> Kurt,
>
> You can use the Grundfos I/O 101 in the pump circuit and when grid is up
> the pv will feed the grid tie inverter and the pump will run on AC. When
> the grid it down the I/O 101 will automatically switch the pump to the
> pv. The trick is getting the voltages in range for both. The lower range
> for the SMA 1100 will work but that is a discontinued model, some around
> still. The 700 will work but will limit which modules you can use, and
> the 2kW range inverters will make it harder to keep the voltage low
> enough.  The max on the SQFlex is 300vDC and you should take into
> account the voltage rise at low temps. Also keep in mind that the I/O
> 101 is only good for 120vAC, not 240.
>
> Thanks,
> Brad Bassett
> AEE










.


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