AC battries ?

Assumeing that a battery is fully charged  (Ah uasally quoted at the 10 hour
rate) 10Ah = 1 A for 10 hours this does not mean that you can get 10A for 1
hour out of them at this level of discharge to a voltage of 1.7vpc (for lead
batts) typically derate by 50% at this sort of discharge current ie 10A a
10Ah battery may last 30 minutes. try looking at the Yuasa web sites and
check out the battery curves for sub 1 minute the current and duration is
available in a table with a period in the seconds order it may be possable to
discharge to 1.6vpc if the load can tolerate it.

The easy way is to calculate the locked roter current on the motor and then a
small UPS so that it wont blow when starting the motor (typically a factor of
about 6) 850 * 6 = 5100w (a 5kva ups) with a 10 minute battery is probably
the most sensable soulition. this way the battery is big enough and also
supports an ac motor !

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