CCA ?

[Barney66]

I am setting up a small solar system for home use.
I need to determine the cold cranking amps for 6V golf cart
batteries. It is not shown on the batt. I went to several
battery sites and could not find CCA's listed in any specs.
for these batteries. I have Exide GC-110 batts.

The reason I'm looking for CCA is the manual that came
w/my PROwatt 1750 inverter says to determine the total
CCA rating of my batteries. If the CCA is 650 or less i need
to install an ANL 250 fuse between the + term and the
inverter. If total CCA is over 650 i need a different type
of fuse. I plan on adding more batteries later, so therefore
i need to be able to calculate the total CCA to see what size
and type fuse is needed. These fuses can be quite pricey,
so i want to install one that can handle four 6V batts with-
out going to a $50. plus fuse setup.

Thanks.

[crewzer]

Cold Cranking Amps (CCA) is a cold weather spec that applies to starting (SLI) batteries. The BCI defines CCA as "the number of Amps a lead-acid battery at 0ºF (-17.8ºC) can deliver for 30 seconds and maintain at least 1.2 volts per cell (7.2 volts for a 12-volt lead-acid battery)." This spec is not applicable to deep-cycle batteries used for PV system applications.

In addition to battery voltage, the typical battery specification of interest is the "20-hour rating", expressed in Amp-hours, or Ah. The typical Ah rating for a 6 V golf-cart (GC-2) battery is ~220 Ah.

HTH,
Jim / crewzer