Hi Dana,
"Sounds like" you have a lower-bus rated at 100A being fed by a 60A
breaker... Yes?
If so, technically speaking but not necessarily the right thing to do, you
have a SWEET SETUP! In 690.64 terms, you are legally allowed 120A to feed
that bus. Which converts to a maximum 60A PV intercon
Hi Ken,
I think I must be not seeing the forest or the trees. Maybe I'm missing
something, but what I'm trying to do is get the most I can from the AC
coupled array (2.25 kW) while still protecting the batteries. I can use
the relays in the inverters or in the FNDC to operate a contactor which
s
Doug,
In an ac coupled system with a Sunny Boy connected to the FX inverter's
output or to the critical loads panel, a grid connected Outback inverter
will work the same as it usually does - it is not affected by the Sunny
Boy other than by the rise of the ac feeder voltage. Just be careful t
Howie,
In an ac coupled system with Outback inverters you could use a diversion
controller such as a Morningstar Tristar 60 on the dc side. That would
allow using an ac coupled system and a nicely controlled finish charge
for the batteries too. Since there is already a MX60 to do the finish
Folks,
Those of us doing work in California are familiar with the CSI program and
it's 10 year warranty requirement.
1 - In order to obtain CSI EPPB I include the required warranty language in
my contract with the original customer. Does California contracting law
allow/require that this warranty
If you backfeed a new breaker added to the top bus, it is a supply-side
connection. The bus bars in the top are exposed to the full fault current
capacity of the utility drop. You wouldn't be limited by the 120% exception.
Or you can backfeed a breaker on the bottom bus, and then it is a load-si
Wrenches,
Howie, good to see you probing this issue.
I have an upcoming system as well that is considering a micro-grid approach.
My question would be, is the Outback not able to sell back and charge
at the same time. I understand that with power present on the ac
output terminal the invert
Dana:
I assume from your description that the top buss is lug fed. One would
need to know the value of overcurrent protection feeding those lugs to
perform the calculations.
Take the rating of a given buss (or feeder) and multiply by 120%. Subtract
from the result the value of the breaker
Two options:
1. Avoid (B), use (A), do a supply side tap.
2. Replace panel (probably a good idea to talk customer into this anyway).
Jason Szumlanski
Fafco Solar
On Oct 28, 2010, at 8:20 PM, "Dana Brandt" wrote:
> Hi everyone,
>
> I'm working on two systems for homes that have the old style
Hi everyone,
I'm working on two systems for homes that have the old style breaker panels
with no single main breaker. Instead, they have six breakers in the upper
part of the panel each labeled "main breaker," which satisfies the six
disconnect rule. The bus bar is split, with one of the six upper
We have done several of these systems with various inverter combinations. We
used a voltage activated relay in the stone age to switch inverters between
battery banks and the grid before the Trace SW came on scene. This little
switch opens and closes a relay based on user adjustable set points.
Hey Mark,
Thanks for the proprietary info!
However, I'm wondering what prevents the batteries from getting cooked
over a period of time if there are light or no loads in the house and lots
of sun. I understand that the relays will divert more and more power as
voltage increases, but if there is
We have done one this way and came up with a good solution that has been
working great for two years now. However, this is proprietary information,
so tough . . .!
Just kidding. . .
We used a Morningstar Relay driver to control 3 different "dump loads" that
turn on at consecutively increasing batt
Allen & Ray,
Ray understands the necessity for the smooth cut on the Corrugated Stainless
Steel Tubing (CSST) as the critical element spot on. All the manufacturers I am
familiar with sell a special tubing cutter for this purpose. (The only thing
special about it is the non cutting rollers are
Hi All,
I have done several AC coupled off-grid systems using Sunny Islands and
Sunny Boys, but I am now doing one with a dual stacked OB VFX3648 (with a
PSX240 on the Inverter out for load balancing) and a SB3000. There is
also an existing array that is running through an MX60. What I am
wonder
HI Allan;
I just recently used some flexible stainless steel line on an old radiator/
boiler system here. It had special fittings, that I was a little dubious of at
first, but it all worked well, and was easy to install.
I believe it was the Easy flex product.
The only problem I encountered, was
Hi William,
Thanks for your input. We install all kinds of grid tied and battery backup
systems but we simply don't have time to deal with DIYers like this.
So, I thought I'd see if any Wrenches happen to be into selling kits
directly to home owners. It's definitely not my cup of tea - I can
Wrenches,
I'm installing a flat-plate SDHW system in my own off-grid home; a
PV-direct closed-loop glycol system feeding a storage tank with two
internal heat exchangers. The glycol lines only need to run a
distance about 25' (each line), but they need to take a circuito
When I hear 'off-grid,' I assume there is no electric power on-site. I have
had
many people request 'off-grid systems' who have utility power already. I try
to
convince those people that the electric grid isn't a bad thing. Many of them
want it for an idealistic reason, because it seems mor
August:
Off-grid and battery back-up are redundant terms. If this is for an
on-grid home wanting battery-back-up, the process of integration involves
many aspects of an electrical remodel intercepting circuits, possibly
installing a small load center in an existing structure). This requires
Hi Wrenches,
I have a DIY client who is looking for a small $10 to $15k complete off grid
battery backup kit he can install himself. Email me off list if you have any
sources or thoughts.
Thanks!
-August
___
List sponsored by Home Power magazine
21 matches
Mail list logo
