[RE-wrenches] Lithium Batteries

[Howie Michaelson]

Hi Folks,
About to spec my first Lithium battery backup job.  The client is not a
heavy user, but wants things done right more than being totally cost
effective.
We put in 14kW of net metered solar using SolarEdge and now he wants the
backup component. This was significantly oversized for his use, but he
wanted to be sure he was putting a bunch more back into the grid than he
was using (making up for past profligate power usage).  We will be using a
dual stacked XW 6848, mostly for enough backfeed capacity (we could wire in
a transfer switch and only use 1 XW, but he'd prefer this setup instead).
I have narrowed down my choice for batteries to either:

   - (2) Iron Edison 200 amp hour batteries, or
   - (3) Discover AES 130 amp hour batteries

Advantages for the AES are that they integrate directly with the Schneider
Xanbus network so the Conext battery monitor provides direct insight into
the SOC and SOH of the batteries, and they have a slightly higher rated
cycle life so higher lifetime energy capacity.

Advantages of the IronEdison are they come in a larger amp hour size
allowing for only needing 2 vs. 3 batteries, they have an integrated fuse
and disconnect, and from my sources are 1/3 less in price.

If anyone has any thoughts on any of this, or corrections to my comparison,
I'd greatly appreciate it.
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