Hello Wrenches,,
We have been asked to take an SMA Sunny Island System that is off-grid, and
convert it to a backup system (Quad stack). Currently, this is a DC
coupled system using Midnite charge controllers. We would like to add SMA
grid-tied inverters to backfeed excess power. I have located
My customer had C&D 600 AH 24 volt 7 kWh @ 50% DOD. AGM style, for a
backup system. After 17 years when the power went out at 23 below.
batteries were warm. They delivered only 1.5 kWh before going below 22
volts. The customer wants a similar or better set. On Float all the
time. Trojan says
I think you can leave it DC coupled and enable grid tie in the Sunny Island
inverters. It might not be quite as efficient but a lot more cost
effective. If you don't already have it Midnite makes a comm box that makes
the Classic look like an SMA device. That might be helpful to coordinate
MPPT and
Mac having installed quite a few of these and having the SMA SIs installed and
operating in my home, ( back up & off grid/ GT) please feel free to contact me
off list. I would strongly concur w/ Bradly w/ his suggesting you utilize the
dc coupling. Tump
> On Feb 18, 2019, at 8:19 AM, Mac Lewis
Darryl,
It sounds like you need a new set of calcium based batteries, or LFP
batteries, if they can afford them.
Remember Lead Antimony batteries want to cycle, calcium batteries, can sit
in float for years...Even so, I still like to cycle Lead-Calcium at least
3-4 times a year... If you use a L
Hi Brad,
I have heard that the selling from the Midnite charge controllers doesn't
work real well. There is a MNSI comm box so it may be the best way
(certainly the cheapest). Does anyone have experience with this scenario,
good or bad?
Thanks for your input as always
On Mon, Feb 18, 2019 at 8
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