On 10/7/14, 9:02 PM, John Lussmyer via EV wrote:
On Tue Oct 07 19:05:39 PDT 2014 [email protected] said:
From: John Lussmyer via EV <[email protected]>
... when I'm running 40A continuous load...
Wow, what the heck are you running? That seems like a very high load, even with
lights on.
Are you using 12V resistance heating?
No
Note this is a F250 truck. So, just sitting with the ignition on runs:
Cooling blower for motors, Power steering pump, along with the usual 12v draw
of the truck.
Then I add Headlights, Heater Blower, Windshield Wipers, Stereo.
There is also the occaisional 40A draw from the Brake Vacuum Pump.
Not much load to shed.
Ah, I think you pointed out the issue: the brake vacuum pump.
Here is what I suggest: get a hand-held IR temperature measurement
device, and then while everything is running (include the vacuum pump)
check for heat on the modules. Also, measure the total current when
everything is running. I looked at a lot of Vicor bricks, and they are
good up until you get near 90% max - then they heat up.
Good luck! Peter
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