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19-05-2008, 01:55 PM
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#1
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Registered User
Boat make: Phantom 23
Join Date: Mar 2006
Posts: 1,693
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Volts, Amps + Watts
Need to get a battery isolator for my car...Well 2,
would i be right in saying a 24v isolator rated to 250A is capable of 500A at 12V?
I need to isolate my power wires to the subs and amps in my boot,
4 amps,
2x kenwood class D amps which are 1000watts continuous and 1600watts peak@ 14.2 V(model-KAC-PS811D)
2x kenwood A/B amps which are (i think 600watts Continuous 1200watts Peak @14.2 V(model-KAC-PS621D )
I need to isolate 2x4gauge power cables,
Any suggestions
Cheers
__________________
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19-05-2008, 07:29 PM
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#2
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Registered User
Location: Scotland
Interests: Hole maker
Boat make: Humber Ocean Offshore
Engines: KAD 300/DPX
Join Date: Mar 2004
Location: Scotland
Posts: 958
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Quote:
Originally Posted by PuppiesBalls
....would i be right in saying a 24v isolator rated to 250A is capable of 500A at 12V?
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Maybe aye, maybe no. The current density through the contacts is important. If it's really high, you might weld them together!  ... 
__________________
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JW.
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19-05-2008, 07:33 PM
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#3
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Registered User
Country: england
Location: southampton
Occupation: engineer
Interests: lots
Boat make: scorpion 8.1
Engines: 250HO
Cruising area: solent
Join Date: Mar 2004
Location: southampton
Posts: 1,353
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Quote:
Originally Posted by PuppiesBalls
Need to get a battery isolator for my car...Well 2,
would i be right in saying a 24v isolator rated to 250A is capable of 500A at 12V?
I need to isolate my power wires to the subs and amps in my boot,
4 amps,
2x kenwood class D amps which are 1000watts continuous and 1600watts peak@ 14.2 V(model-KAC-PS811D)
2x kenwood A/B amps which are (i think 600watts Continuous 1200watts Peak @14.2 V(model-KAC-PS621D )
I need to isolate 2x4gauge power cables,
Any suggestions
Cheers
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by battery isolator do you mean a split charger or diode unit?? or a big fat switch!
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20-05-2008, 12:51 PM
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#4
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Registered User
Boat make: Phantom 23
Join Date: Mar 2006
Posts: 1,693
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A big switch 
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20-05-2008, 12:53 PM
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#5
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Registered User
Boat make: Phantom 23
Join Date: Mar 2006
Posts: 1,693
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Quote:
Originally Posted by jw.
Maybe aye, maybe no. The current density through the contacts is important. If it's really high, you might weld them together! ... |
yerr 
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20-05-2008, 01:27 PM
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#6
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hello
Join Date: Mar 2004
Posts: 2,739
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Quote:
Originally Posted by PuppiesBalls
would i be right in saying a 24v isolator rated to 250A is capable of 500A at 12V?
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Nope.
250A is the maximum current carrying capacity. 24V is the isolation rating governed by the clearance between the contacts.
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20-05-2008, 01:30 PM
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#7
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Registered User
Boat make: Phantom 23
Join Date: Mar 2006
Posts: 1,693
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JBD?
So its suitable for 250a@12v too?
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20-05-2008, 01:35 PM
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#8
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Large member
Country: England
Location: On the farm
Occupation: General Trouble Causer Salterns Boatyard
Interests: Official smartass
Boat name: Seahorse.org
Boat make: a V24 and a SLOW unstable ICE Bladerunner
Engines: 2x300 promax, 320 Volvo
Cruising area: England/France & Med
Join Date: May 2005
Location: On the farm
Posts: 2,681
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Quote:
Originally Posted by PuppiesBalls
JBD?
So its suitable for 250a@12v too?
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yes
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20-05-2008, 08:59 PM
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#9
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Registered User
Country: England
Location: Cowes, Isle of Wight
Occupation: Marine engineer/electrician
Interests: Boat, Landy, and other toys :)
Boat name: Mad Max/Master Fiddler
Boat make: Phantom 18/Fletcher Bravo
Engines: Merc XR2
Cruising area: Solent/IOW
Join Date: Dec 2005
Location: Cowes, Isle of Wight
Posts: 935
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Out of interest why do you want to isolate them?
__________________
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, grinning from ear to ear, overdosing on adrenaline and proclaiming “KINNEL!! WHAT A RIDE!!”
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21-05-2008, 11:59 AM
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#10
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Registered User
Boat make: Phantom 23
Join Date: Mar 2006
Posts: 1,693
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worse case scenario happens i can cut the power to them
2x 1600watts @14.4v =222.22 amps
2x1200 watts @14.4v =166.66 amps
so amps can draw a total of =388 amps
hents i cant have a fuse inline, you cant get the type of fuses i need at high enough rating.
Also its just a good idea to be able to isolate the power to the amps, if a wire ever comes off then im nackerd!
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21-05-2008, 05:25 PM
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#11
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Registered User
Country: UK
Location: Weston Super Mare
Occupation: Electrical Engineer
Join Date: Mar 2004
Location: Weston Super Mare
Posts: 6,351
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Your car won't move with all the weight of the batteries and extra drain on the engine with the massive alternator you'll need to charge them!!!
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21-05-2008, 06:35 PM
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#12
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Registered User
Country: Guernsey
Occupation: Engineering
Boat make: None, boo!
Engines: Turbines mainly!
Cruising area: The inside of my workshop!
Join Date: Mar 2008
Posts: 2,646
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But damn it'll sound good while it's sat in his drive!1  
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21-05-2008, 07:23 PM
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#13
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Traveling
Country: UK
Location: Alderholt
Occupation: Aerospace
Boat name: T/T D2S
Boat make: Midas 27' Cat, Argo 16 Cat. Avon Rib Thingy
Engines: Merc 280-ROS -JSRE,65Xs, 75 Stinger, Yam 60
Cruising area: Any Seedy Bar
Join Date: Sep 2004
Location: Alderholt
Posts: 4,225
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I check ya numbers & cals as In theory just one small woofer is 2.1 HP  that dont seem right
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