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Old 03-18-2018, 10:07 PM   #1
BBQ
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Default 50v - hi-voltage electrical systems

.

Which van platform will have this first?

Probably the new Sprinter?

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Old 03-18-2018, 10:29 PM   #2
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who woulda thunk it?

it's not so exotic. it's like the change from lead acid to agm. takes a while then everyone has it
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Old 03-18-2018, 10:34 PM   #3
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i googled 48 volt electrical systems-

dozens of articles who knew

sample one



https://www.extremetech.com/extreme/...trical-systems
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Old 03-19-2018, 10:00 PM   #4
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Ram will. They already have on the 2019 pickup.

https://www.greencarreports.com/news...r-fuel-economy
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Old 03-20-2018, 04:02 AM   #5
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Just looked closely at the Volta online data sheets for their DC-DC converters and inverter/chargers. They are made by Magnum - good stuff.


- - Mike
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Old 03-20-2018, 08:28 PM   #6
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Higher voltages are common with off-grid solar installs. It allows for skinnier wires, but the downside is potential shock if the system is poorly designed.
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Old 03-27-2018, 06:27 PM   #7
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Shock is about the only downside Iím aware of. Higher voltage is more efficient.

12V is a legacy of ancient tech.


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Old 03-27-2018, 08:12 PM   #8
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We have heard from several places over the years that 50v on DC relays and switches can cause accelerated wear and pitting, so the devices need to be somewhat different and pass lots of life testing, I think. I know that the contactors of similar voltage in forklifts and such take a real beating over time, and they are huge, and noisy.

Tesla has a 12v battery to run some stuff, I wonder how much of the stuff like this is actually at higher voltage, or did they stick to 12v for reliability?
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Old 03-27-2018, 08:45 PM   #9
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We have heard from several places over the years that 50v on DC relays and switches can cause accelerated wear and pitting, so the devices need to be somewhat different and pass lots of life testing, I think.
I think the pitting is less a function of voltage than it is on the level of the heavier loads that 50 volt circuits permit when the relay is de-energized. I don't think that pitting occurs when relays make, regardless of the voltage or load. Rather, it seems to occur when the contacts start to break and there is a momentary arc between the contacts as they separate. It's a common symptom in RV transfer switch relays and separators caused by the failure to shed loads before engaging and disengaging relays.

Arcing and pitting can be mitigated with improved contact material, arcing suppression networks and providing contact wiping to slough off detritus but faced with releasing heavy loads, IMO, it's not a matter of if but when the contacts will pit and eventually fail.
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Old 03-27-2018, 08:55 PM   #10
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Higher voltages are common with off-grid solar installs. It allows for skinnier wires, but the downside is potential shock if the system is poorly designed.
50 volts may produce some discomfort but unless someone is equipped with a pacemaker I don't think it can cause cardiac consequences. IIRC, remote audio lines in sound systems operate at 70 volts which I believe is the upper limit permitted before being subject to code protection requirements.
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