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<p>Thanks Brad,</p>
<p>I think I am finally getting it.</p>
<p>When on-grid, the grid is providing wave form and transistors in
BB are available to provide voltage regulation.</p>
<p>When off-grid, the transistors in the BB are required to provided
wave form and not available to provide regulation.</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 11/4/2019 6:10 AM, Bradley Bassett
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAEpjgH2PtPYYNb9uKE-y96+URKTh3RdV_paLdm2VHNvxfXC0Zg@mail.gmail.com">
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<div dir="ltr">
<div>Mark,</div>
<div><br>
</div>
<div>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.</div>
<div><br>
</div>
<div>Brad<br>
</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Sun, Nov 3, 2019 at 6:10 PM
Mark Frye <<a href="mailto:markf@berkeleysolar.com"
moz-do-not-send="true">markf@berkeleysolar.com</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">OK
Jay that makes sense.<br>
<br>
This must mean that there is a significant difference in the
function of <br>
the BB inverter when it is in off-grid mode vs when it is in
grid <br>
connected mode.<br>
<br>
On 11/3/2019 5:45 PM, jay wrote:<br>
> No, older non frequency shift BB inverters don\u2019t
communicate that way.<br>
><br>
> They have no communication with a Rule 21 GT inverter.<br>
><br>
> 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.<br>
><br>
> jay<br>
><br>
> peltz power<br>
><br>
>> On Nov 3, 2019, at 4:31 PM, Mark Frye <<a
href="mailto:markf@berkeleysolar.com" target="_blank"
moz-do-not-send="true">markf@berkeleysolar.com</a>>
wrote:<br>
>><br>
>> 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".<br>
>><br>
>> On 11/3/2019 4:26 PM, Dave Angelini Offgrid Solar
wrote:<br>
>>> The BB inverter will drive the grid inverter off
frequency because it is<br>
>>> full/floating and the grid tie will stop
producing power. This is how AC<br>
>>> coupling works but if something goes wrong, like
programming gets corrupted<br>
>>> by surges or the battery hits an LBCO or HBCO AC
power will stop. Or if<br>
>>> this is being controlled by Soc and it gets wrong
data or there is a<br>
>>> network issue, or all of the other things that
can happen that I have not<br>
>>> thought of.<br>
>>><br>
>>> Why do you not want to build a normal DC couples
system? I forget<br>
>>> fast....Happy Hour!<br>
>>><br>
>>> Dave Angelini Offgrid Solar<br>
>>> "we go where powerlines don't"<br>
>>> <a href="http://members.sti.net/offgridsolar/"
rel="noreferrer" target="_blank" moz-do-not-send="true">http://members.sti.net/offgridsolar/</a><br>
>>> e-mail <a href="mailto:offgridsolar@sti.net"
target="_blank" moz-do-not-send="true">offgridsolar@sti.net</a><br>
>>> text 209 813 0060<br>
>>><br>
>>> On Sun, 3 Nov 2019 16:17:39 -0800, Mark Frye <<a
href="mailto:markf@berkeleysolar.com" target="_blank"
moz-do-not-send="true">markf@berkeleysolar.com</a>><br>
>>> wrote:<br>
>>>> Folks,<br>
>>>><br>
>>>> Please allow me to ask another question:<br>
>>>><br>
>>>> Suppose I have a bi-direction inverter/charge
with no connection to the<br>
>>>> grid.<br>
>>>><br>
>>>> I have GT inverter ac coupled and producing
2000w. The battery is in<br>
>>>> float, and I have 2000w of load connected.
All is well.<br>
>>>><br>
>>>> Now suppose I remove the loads without
disconnecting the GT inverters.<br>
>>>><br>
>>>> The word is that something bad happens now. I
would like to understand<br>
>>>> what that bad thing is.<br>
>>>><br>
>>>> I have one explanation that I think says that
the GTs will continue to<br>
>>>> produce the 2000w, and that energy will go
into the batteries in an<br>
>>>> unregulated fashion. When does this end, when
the batteries blow up? Is<br>
>>>> that the consequence of not disconnecting the
GT?<br>
>>>><br>
>>>> With many thanks in advance for your help in
understanding.<br>
>>>><br>
>>>> Mark<br>
>>>><br>
>>>>
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