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 <ma...@berkeleysolar.com
<mailto:ma...@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 <ma...@berkeleysolar.com
<mailto:ma...@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 offgridso...@sti.net <mailto:offgridso...@sti.net>
>>> text 209 813 0060
>>>
>>> On Sun, 3 Nov 2019 16:17:39 -0800, Mark Frye
<ma...@berkeleysolar.com <mailto:ma...@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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