ROBIN:
Thanks for the candid response.
I assure you that I am one of those "old
off-grid guys".
The system I am working on is 120V (L, N) only, and requires the
inverter/charger to have separate "grid-in/out", "genset in", and
"inverter output" to the protected loads panel (PLP).
Based on the drawing on the MidNite web site, the SMARB is designed
for 240V (L1, L2, N). If that's the case, I would use only the "L1"
path, or perhaps parallel the "L1" and "L2" paths.
I prefer to use the Sunny Island because of its superior battery
charge management.
Would it be possible to purchase just the SMARB
product as an individual part item, or would we need to purchase a
SMA E-Panel (i.e., MNE250SMA‐OG) with the SMARB pre-installed?
If so, can you provide the ordering part #s and pricing info?
Regards,
Gary Willett, PE
Icarus-Engineering LLC
Icarus Solar Services LLC
1124 Gloucester Ct S
Irving TX 75062-7505
TX PE License # 105617
NABCEP Certified Solar PV Installer # 031310-246
972-252-2543 (office)
972-252-4352 (fax)
214-629-4279 (cell)
g...@icarus-engineering.com
g...@icarussolarservices.com
After
spending a lot of time and money to make the SMA Sunny
Island work with a grid tie inverter system of twice the
Sunny Island capacity we dropped the project. The problem we
had is that the system is complicated and we were spending
far too much time working with the people in the field as
well as with our own internal wiring shop. We have made
changes in our own shop and can now better build these
systems. We have one customer that uses a lot of these
because he insists on putting 20 to 24KW of PV on double
stacked AC coupled Sunny Island systems. We have had no
issues at all in the field when the SMARB system is properly
installed. We are very leery of opening this back up to
installers because it is quit often being installed by
people who are not really qualified to do this in the field.
We have begun building these once again for this one
customer on pre-wired systems. We doubled the price though
since we were losing money at the old price. We do not know
if we will open it up for sales as a kit to be installed in
the field? For a competent installer (old off-grid guys), it
is a snap. We welcome your comments as we pride ourselves on
coming up with solutions for problems. This one turned out
to be tough even for us, but once we had it all figured out,
it became a nice product, but had a bad history of support
due to a moving target of how to make it work.
Robin
Gudgel
MidNite
Solar
On 6/9/2015 8:33 PM, Gary Willett wrote:
Fellow Esteemed Wrenches:
Working on a on-grid battery back-up system with generator where
client wants to use SMA Sunny Island / Sunny Boy.
Anybody know where to find the MidNite Solar SMA Relay Board
(MNSMARB), or a functional equivalent? It is intended to be
installed inside the MidNite SMA E-Panel.
I searched the MidNite site and found the attached document, but
no other info.
Thanks!
Gary Willett PE
Icarus Engineering / Solar Services
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