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

Brad Bassett bbassett at hei.net
Mon Jun 18 20:28:53 PDT 2007


I think they mean that you have to start the generator manually, I think 
that when AC power is applied to the I/O 101 it will switch to the AC 
power automatically. There isn't any manual switch to do it. 

Brad



Kurt Albershardt wrote:
> 
> 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
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> .



Brad Bassett


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