[RE-wrenches] Parts List For AC Couple Disconnect
Mark Frye
markf at berkeleysolar.com
Mon Nov 4 09:59:09 EST 2019
Thanks Brad,
I think I am finally getting it.
When on-grid, the grid is providing wave form and transistors in BB are
available to provide voltage regulation.
When off-grid, the transistors in the BB are required to provided wave
form and not available to provide regulation.
On 11/4/2019 6:10 AM, Bradley Bassett wrote:
> Mark,
>
> The difference is that when AC coupled the power is coming backwards
> into the AC out. When it's charging from the grid or generator it is
> charging from the AC inputs. The inverter can control the charge from
> the inputs but not what is coming in reverse into the output.
>
> Brad
>
> On Sun, Nov 3, 2019 at 6:10 PM Mark Frye <markf at berkeleysolar.com
> <mailto:markf at berkeleysolar.com>> wrote:
>
> OK Jay that makes sense.
>
> This must mean that there is a significant difference in the
> function of
> the BB inverter when it is in off-grid mode vs when it is in grid
> connected mode.
>
> On 11/3/2019 5:45 PM, jay wrote:
> > No, older non frequency shift BB inverters don’t communicate
> that way.
> >
> > They have no communication with a Rule 21 GT inverter.
> >
> > The BB, it will just keep charging and charging with any extra
> energy coming from the GT inverter. The BB has no regulation,
> there is no absorb or float, just charge.
> >
> > jay
> >
> > peltz power
> >
> >> On Nov 3, 2019, at 4:31 PM, Mark Frye <markf at berkeleysolar.com
> <mailto:markf at berkeleysolar.com>> wrote:
> >>
> >> OK, I am hearing this over and over and I just want to confirm
> that is true even if the BB is older and does not have "NEW
> Frequency Shifting AC Coupling".
> >>
> >> On 11/3/2019 4:26 PM, Dave Angelini Offgrid Solar wrote:
> >>> The BB inverter will drive the grid inverter off frequency
> because it is
> >>> full/floating and the grid tie will stop producing power. This
> is how AC
> >>> coupling works but if something goes wrong, like programming
> gets corrupted
> >>> by surges or the battery hits an LBCO or HBCO AC power will
> stop. Or if
> >>> this is being controlled by Soc and it gets wrong data or
> there is a
> >>> network issue, or all of the other things that can happen that
> I have not
> >>> thought of.
> >>>
> >>> Why do you not want to build a normal DC couples system? I forget
> >>> fast....Happy Hour!
> >>>
> >>> Dave Angelini Offgrid Solar
> >>> "we go where powerlines don't"
> >>> http://members.sti.net/offgridsolar/
> >>> e-mail offgridsolar at sti.net <mailto:offgridsolar at sti.net>
> >>> text 209 813 0060
> >>>
> >>> On Sun, 3 Nov 2019 16:17:39 -0800, Mark Frye
> <markf at berkeleysolar.com <mailto:markf at berkeleysolar.com>>
> >>> wrote:
> >>>> Folks,
> >>>>
> >>>> Please allow me to ask another question:
> >>>>
> >>>> Suppose I have a bi-direction inverter/charge with no
> connection to the
> >>>> grid.
> >>>>
> >>>> I have GT inverter ac coupled and producing 2000w. The
> battery is in
> >>>> float, and I have 2000w of load connected. All is well.
> >>>>
> >>>> Now suppose I remove the loads without disconnecting the GT
> inverters.
> >>>>
> >>>> The word is that something bad happens now. I would like to
> understand
> >>>> what that bad thing is.
> >>>>
> >>>> I have one explanation that I think says that the GTs will
> continue to
> >>>> produce the 2000w, and that energy will go into the batteries
> in an
> >>>> unregulated fashion. When does this end, when the batteries
> blow up? Is
> >>>> that the consequence of not disconnecting the GT?
> >>>>
> >>>> With many thanks in advance for your help in understanding.
> >>>>
> >>>> Mark
> >>>>
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