Hi wrenches,
I have a site visit coming up on a hydro system, I believe its ~ 20 kW
range, and an older unit, 30+ years old. This info may or may not be
reliable until I see the site. However, I'd like some options to consider
while I'm looking at their system. My hydro knowledge is weak but I
Mac,
Most Multi-Mode inverters I know of should work for your intentions. You feed
the hydro source into the generator input terminals on the multimode inverter,
and you program the inverter in "generator support mode," and then you program
the inverter with the maximum stable output of the hyd
Canyon Hydro and Thomson & Howe Controller?
There are all kinds of things that can be done to upgrade late 20th century
hydro systems.
Michael
> On Nov 3, 2019, at 5:46 AM, Mac Lewis wrote:
>
> Hi wrenches,
>
> I have a site visit coming up on a hydro system, I believe its ~ 20 kW range,
>
Hi William,
Thanks, you bring up issues that are important to me here.
In particular, my situation is that the GT inverter is inter-tied a
couple sub panels upstream of where I want to put the BB inverter. The
distance is long, so I am looking for a solution where I don't have to
run a cable
With frequency-on/off, frequency power control, or other “inverter integrated”
control based on battery voltage/state of charge there is also control in
regards to when the ac coupled inverters come back on. And yes, this is
definitely needed to prevent overcharge (or get three-stage charging fr
OK Brian,
So I think you are confirming that monitoring AC side voltage is an
acceptable way of deciding when to disconnect the GT inverters.
With my parts list, I have a delay time that would hold the GT inverters
off-line for some period of time (I would probably set to 1 hour) before
comi
Hey now I didn’t say that!
Brian
> On Nov 3, 2019, at 10:01 AM, Mark Frye wrote:
>
> OK Brian,
>
> So I think you are confirming that monitoring AC side voltage is an
> acceptable way of deciding when to disconnect the GT inverters.
>
> With my parts list, I have a delay time that would hol
More like “could work let us know how it goes!”
Brian
> On Nov 3, 2019, at 10:01 AM, Mark Frye wrote:
>
> OK Brian,
>
> So I think you are confirming that monitoring AC side voltage is an
> acceptable way of deciding when to disconnect the GT inverters.
>
> With my parts list, I have a dela
Marc, High or low battery cut-out on a battery based inverter is lights
out. There is usually a warning period that becomes a fault. I still think
this is crazy for offgrid unless it is a very large system 20+KW of battery
inverters in a microgrid type mindset with onsight knowledgeable people.
Als
Mark:
I do not think line voltage is an appropriate criteria for controlling an
AC coupled system for these reasons:
1. My understanding of how an AC coupled system works does not match
yours. The concept is still black magic to me, but as I understand it,
when you use GT inverters to ch
Mark,
I think that you're not understanding what Brian is saying. In any case, your
proposal will not work with most equipment. There may be some equipment that
would work that way, but not anything I'm aware of. Let me tell you what will
happen in a normal system, assuming that the manufacture
OK, the posts are coming in on the "no" side, but with uncertainty about
how any given BB inverter might work.
I still think that the BB charger is in charge (no pun) of sending power
to the battery and if it the battery is at it's set point then the duty
cycle on the transistors in the recti
Mark,
Sorry, my post must not have been perfectly clear... I have total confidence in
how the BB inverters work, and no, the GT inverter there will be no measurable
deduction in impedance, even if you have a very sensitive sensor and there are
no other loads on the system. It just doesn't work
Doesn't the BB inverter have a relay output that can be linked to 'batteries
are full' and energize a relay to drop out the AC line to the GT inverter, thus
causing it to go offline?-GlennSent from my 'smart'phone, so please excuse
typos and spelling errors.-- Original message--From: Mar
What everyone else is saying appears to all be good info. My summary
(which could be off):
1) You don't want to signal the relay based on AC voltage. Period.
2) the BB inverter will signal the GT inverter through frequency shift,
once the batteries reach absorption voltage.
3) The relay is f
An option that will work for sure is a diversion load and controller.
This can be done with most standard CC’s and or inverters using the AUX relay
driving another SS relay, and then the diversion load. The load can be a
standard AC oil heater, safe, inexpensive, reliable. ( this is what I u
Folks,
I do not want to be obdurate here, perhaps just a slow learner.
I have to ask the question though:
In the case of a BB inverter connected to the grid only, with no GT
inverters, you don't have to shutdown the whole inverter when the
battery is full because you are not required to en
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
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
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/flo
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 an
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
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, G
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.
Hi mark,
Not quite.
The BB will keep charging unregulated until the battery voltage reaches high
battery voltage cutout set point.
jay
peltz power
> On Nov 3, 2019, at 5:05 PM, Mark Frye wrote:
>
> OK, great, I am really getting the message, but I would like to understand,
> if for som
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 ha
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