fexlboi wrote:RichD wrote:Jay to put a ammeter on the circuit and see exactly what it pulls with the glow plug cycle and everything.
Mr. Electrical did that already. As far as I remember it was 257 amps.
Actually my aim was to add some more sciencey content to the thread but okay now you made me work.
250ish amps is the pulse load of the starter. That load only lasts for less than a second. The load over the entire 10 second (ish) start procedure is in three stages before the alternator starts chipping in:
1- Accessory load + glow plug pre-heat
2- Accessory load + glow plug steady state
3- glow plug steady state + starter spike
On my vehicle the starter circuit is isolated and we can measure both loads independently... purely for academic reasons and to confirm assumptions...
CCA is a rating based on the number of amperes that can be removed from a battery over a 30 second period at 0 degrees Fahrenheit. So, technically, CCA doesn't really align with your needed starting amps. That's why Odyssey started listing PCA (pulse cranking amps) on their batteries.
I suppose that the desired rating of battery would have to be a function of what the pulse load looks like multiplied by the amount of time you want to be able to crank the starter (e.g. in a fault situation where you had to work the thing several times over), and the CCA would give you an idea of the low end performance of the battery in cold conditions which, ideally, would exceed your projected worse case scenario load by A Lot.
My battery died and i would like some advice on what to get ?? lower mainland temps etc i just am not sure on cranking amps etc etc also i just have the single battery system.
Good Ship Miss Lil' Bitchi
