48V will soon be the new standard, as it is used in just about all mild hybrid systems. Not quite enough voltage to be a high level hazard, but enough to propel a car from a stop.
Nubo said:Seems there was some noise about this a few years back, changing the standard to either 36V or 48V. Haven't seen anything about it in a while though.
But, WHAT does he mean by the "for giggles ..." sentence ?
RustyShackleford said:Trying to duplicate the OP (a little late for Dorian, oh well) ...
He gives pretty detailed info about the parts he uses, but not the 150 amp breaker. Anyone got a good pointer for one of those ? And why not a 125-amp breaker ? That's more than enough juice for the 1000watt inverter he uses, and 150 amps could overload the Leaf's DC-to-DC converter (theoretically the 1000watt inverter couldn't pull that much juice, but if you totally trust your car's welfare to theory, why have a breaker at all ?)
Iirc, some inverters can support transient loads above their normal rating
I saw those kinds of connectors on some of the breakers at Amazon too. Looks like you just stick the end of the wire in and tighten a set screw ? How does it adjust for different size cabling (I'l probably want to use 2awg like the OP) ?BrockWI said:I have given up on "breakers" and gone to inline fuses
https://www.amazon.com/gp/product/B01N2YEVCH/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
Yeah this seems better - whether I use the breaker or fuse version - skips a connection step.BrockWI said:They will list the maximum size wire they can clamp down on and mine came with 2 sizes of smaller sleeves that fit in to take smaller wire. You can also get them that have bolt on for lead with eyelets on them.
Apart from the extreme safety issue, there is the problem of switching off 400 VDC. A cheap rocker switch isn't going to do it; the contacts will arc and the current will keep flowing. DC rated contactors need magnetic blowouts and/or near-vacuum to switch even moderate power levels. Traction batteries will probably drift towards 1000 V for ultra-fast charging, making the safety and switching problems even more extreme.GetOffYourGas said:Makes you wonder how long before all of those high-power accessories are converted from 12V to 400V.
I suspect that mild hybrid cars will have the blower, headlights and a few other high powered loads on 48 VDC, but the cigarette lighter, interior lights, dash etc may still run off 12 VDC via a DC-DC converter. Anyone know for sure?
Actually, I'm now thinking I'll try to back-feed some house wiring; if the GCFI outlet's ground is tied to that ground lug next to the battery connections, sounds like I can just leave the latter disconnected.LeftieBiker said:I had a similar issue with the chassis ground with my inverter. In my case I'm going to disconnect it because the inverter is grounded through the house wiring when plugged in, and having two separate grounds was tripping the inverter's GFCI outlet. You, however, need to ground the inverter. You can use a grounding rod, or a ground wire connected to the house ground circuit or to metal plumbing nearby. Don't try to use the Leaf, as it's isolated from ground.
RustyShackleford said:DELETED
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