[RE-wrenches] hueRe: Parts List For AC Couple Disconnect

[Mark Frye]

OK, great, I am really getting the message, but I would like to 
understand, if for some reason the BB does not raise the frequency or 
the GT does not response, or the BB fails to stop on HBCO the ultimate 
consequence is unregulated charging of the battery until failure?

On 11/3/2019 4:56 PM, Glenn Burt wrote:
> Indeed, as long as nothing goes wrong with the BB inverters ability to 
> shift the freq, and the GT's ability to follow the UL 1741 
> requirements, nothing bad should happen. However it is best practice 
> to have a secondary method in place to ensure the GT drops out of the 
> picture. That most commonly is ensured with an interposing relay 
> controlled by the BB inverters knowledge of the battery charge, or a 
> secondary device that performs the measurement.
>
> -Glenn
> Sent from my 'smart'phone, so please excuse typos and spelling errors.
>
> ------ Original message------
> *From: *Mark Frye
> *Date: *Sun, Nov 3, 2019 7:36 PM
> *To: *re-wrenches at lists.re-wrenches.org 
> <mailto:re-wrenches at lists.re-wrenches.org>;
> *Cc: *
> *Subject:*[RE-wrenches] hueRe: Parts List For AC Couple Disconnect
>
> Happy Hour, yes it is that time here in our home.
>
> Thanks again, but I guess I don't see that there is a catastrophic
> result here, the BB raises the frequency and trips the GT. So what, as
> long as the BB returns to a standby.
>
> On 11/3/2019 4:31 PM, Mark Frye 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-mailoffgridsolar at sti.net  <mailto: offgridsolar at sti.net>
> >> text 209 813 0060  <tel:209 813 0060>
> >>
> >> On Sun, 3 Nov 2019 16:17:39 -0800, Mark Frye >> 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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