{Greg}
If I were going to install a full off grid potential solar power system for my
ranch I would buy lead acid Telco system batteries.
They are not true deep cycle, but have such high capacity that it isn't an
issue. They are initially expensive and huge. ( I might buy some 10yr old units
being decommissioned )
On the plus sign they can have up to a 30 year service life and are user
serviceable with rebuild kits which swap out the battery plates.
Back in the 80's the phone company would look at the budget come 4th quarter
and if there was a surplus they would rebuild older battery banks of 12 year or
older.
Now with OSHA and Hazmat regs they hire independent battery maintenance to
service these batts.
New installs are likely going away from lead acid due to acid vapor and
hydrogen issues as well as a much reduced foot print per KWh.
But EMP proof? - hard to kill a plain lead acid system.
{/Greg}
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