Many times the dc to dc advertises peak current. Check the spec. It may do 50 amp peak but on 30 amp continuous.
Sent from my iPhone > On Apr 26, 2018, at 9:44 PM, John Lussmyer via EV <[email protected]> wrote: > > I have my F-250 back on the road after some (long drawn out, time wasted) > repairs to a motor terminal, and rebuilding the transmission. > (and exploding a contactor...) > I'm getting some really WEIRD results with my DC-DC. (ok, power supply) > It's capable of 50A output, and is set for about 14v output. > > When I start the truck, it zooms up to around 50A for a few seconds (probably > trying to top off the weak 12V battery), then gradually drops down to 25A or > so for the trucks basic needs. All this time the voltage sits at around > 13.9V. > > Then I start driving, as I have the Zilla start pulling significant power - > the DC-DC output voltage drops, sometimes as low as 11v. The REALLY REALLY > weird bit is that it's still only supplying 25-30A. > If I take my foot off the pedal, the voltage shoots back up to 13.9v. > > Right now, I'm assuming the (nearly dead) 12V battery is the main issue - but > shouldn't the DC-DC start pumping out more current when something is drawing > down the battery like that? > > Also, since the Zilla doesn't actually use more 12V power, it makes no sense. > The voltage drop does seem to be kind-of in proportion to how hard i'm > pressing on the accelerator pedal. > > (I should also note that my Tach Sensor seems to be not working correctly, as > it's readding way low - and not fully consistent. So probably having noise > problems on the signal or power lines. Gonna try replacing the capacitors on > those.) > > -- > Worlds only All Electric F-250 truck! > http://john.casadelgato.com/Electric-Vehicles/1995-Ford-F-250 > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA) > _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
