Batteries - Amp/Hours or CCA ?

[fishingaz]

can anyone explain ?i have a 85hp nanni in my arvor so what type of rateing do i look for .ie.amp hrs.or cold cranking?

[daddle]

For starting batteries the CCA may be more relevant. For house batteries the 20 hour Ah rating seems to be the popular guide.

[GordMay]

As Daddle says.

See also ➥ Deep-Cycle RV Battery Ratings and Specifications: CCA, MCA, RC, Ah,


House Battery Banks require high Amp/Hour capacities.
The amp-hour rate (or 20 hour rate) is measured at a current that drains the battery capacity in 20 hours to a voltage point of 10.5 volts. This test is conducted at 80°F.

Starting Batteries require high Cranking Amperes.
Battery capacity and voltage are reduced as the temperature declines. To start a car on a freezing winter morning, a powerful battery is needed. CCA or CCP is the maximum discharge current in amps that a new, fully charged 12 volt battery at 0°F can deliver for 30 seconds and maintain a voltage of 7.2 volts. MCA uses the same method except the temperature is 32°F. The higher the CCA or MCA rating the easier it will be to start your engine in cold weather.

Batteries are also rated in reserve capacity or peak capacity. Reserve capacity is a test in which a discharge load of 25 amps is placed on a battery at 80°F, and the time is measured until the battery voltage reaches an end point of 10.5 volts. The higher the reserve capacity the greater the amp-hours a battery holds.