Years ago, when I was researching SB/SI microgrid solutions for a
Ted Turner high-end off grid rich man's lodge, John Berdner (at that
time the head of SMA-America) had made me the same recommendation:
that a small amount of PV be wired as a DC charge-controller-based
input. This was a final fail-safe approach, in case the array was
insufficient and the gennie didn't start. It would bring the
batteries to a minimal voltage level, such that the SB/SI system
would return to operation once the batteries recovered.
Allan
Allan Sindelar
al...@sindelarsolar.com
NABCEP Certified PV
Installation Professional
NABCEP Certified Technical Sales Professional
New Mexico EE98J Journeyman Electrician
Founder (Retired), Positive
Energy,
Inc.
505 780-2738 cell
On 6/6/2015 8:23 AM, Mac Lewis wrote:
Hi Mark,
The Sunny Island has various battery protection modes and
will shutdown based on user programmable state of charge
levels. Level 2 battery protection will start the Sunny Island
every 2 hours in an attempt to get charge into the batteries.
You should set this level up at times when energy input is
likely. See page 113-114 here: http://files.sma.de/dl/15216/SI4548-6048-US-BE-en-20.pdf
If it doesn't get any charging to the batteries for 10
minutes, it will shut down and wait again.
This is an advantage of having at least some DC coupled
solar input.
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