[aprssig] Emergency power from your EV/Hybrid

[Rick Green]

On Tue, 7 Sep 2021, Andre wrote:

> Why not use a offgrid PV inverter?, there are a lot of those available and 
> they can handle up to 800 V or in some cases even more.

  Actually, No.  The offgrid inverters are generally designed for 46V DC input. 
The HV DC inverters on the market are mostly grid tie/ utility power synchronous 
only.  I have not found one with a local clock source that will start and run 
without AC already present.
   There have been some experiments using a small UPS to power a 'nano grid' and 
fool the grid-tie inverter into starting.  See Bob's website for links. 
I would suspect this arrangement to have some voltage regulation stability 
issues, The larger grid presents a very low impedance load, which does not vary 
radically when a single device starts up.  With your home 'microgrid', the load 
can instantly double when your deepfreezer needs to start.
   It wqs mentioned in another post that the EVs on the market have 100-200amp 
DC-DC converters to maintain the 12v battery and accessories. So you could use a 
1.0 to 2kW  'trucker' inverter for essential loads only.   Are there any 
200-350VDC to 48VDC  DC-DC converters on the market, capable of supplying 
~250amps for a ~10kw off-grid inverter?

-- 
Rick Green

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