It also stops sending current to your breaker panel thus shutting off the solar 
power.

Sent from my iPhone

> On Aug 14, 2019, at 9:47 PM, Cor van de Water <cor.vandewa...@gmail.com> 
> wrote:
> 
> Paul,
> Tell me how you switch a solar panel off?
> Only way I know is to throw a light blocking cover over the panels.
>  
> What the solar inverter does when it detects any anomaly in the grid is to 
> stop sending current into the grid, effectively stopping the transfer of 
> energy from solar to grid. Depending on the design of the inverter, it may 
> remain powered from the solar input and ready to restart as soon as the grid 
> is again within limits. Other designs are powered from the AC input and 
> completely turn off when the grid goes away, despite power from the solar 
> being present.
> As a result of not using the solar power, the solar input DC voltage will 
> climb to the OC (Open Circuit) limit, the actual voltage level is dependent 
> on solar irradiation and temperature of the panels. In freezing conditions 
> when the full sun suddenly appears from behind a thick cloud you get the 
> highest output voltage and this *must* be below the max rating of the 
> inverter (or it might blow up) so that is one of the design constraints for 
> the solar system, one of many reasons that MPPT voltage is typically a LOT 
> below the max voltage of the inverter.
> Installers will demand that they get the OC voltage of the panels at the 
> lowest recorded temperature for the area where they will do the installation.
>  
> Sent from Mail for Windows 10
>  
> From: paul dove
> Sent: Wednesday, August 14, 2019 11:32 AM
> To: Electric Vehicle Discussion List
> Cc: Cor van de Water; jkenny23
> Subject: Re: [EVDL] FW: PowerWheels idea (Vehicle-to-home)
>  
> I thought grid tied inverters shutdown the solar panels when no grid power is 
> detected.
>  
>  
> On Wednesday, August 14, 2019, 12:50:01 AM CDT, Cor van de Water via EV 
> <ev@lists.evdl.org> wrote:
>  
>  
> All grid tie central inverters (so, not the micro inverters) take input 
> voltage above 400V so they can direct switch the AC output without 
> transformers. Input is typically up to 1000V these days.
> I plan on installing solar strings of at least 400V so that I can always 
> charge my EVs by direct wiring the panels to the battery, in case there is no 
> grid and I need energy in my EV.
> I also have a large UPS that is intended to run with 2x 192V lead-acid 
> batteries (it is an older model double conversion UPS) so I am planning to 
> connect it to a Leaf pack with center tap so it can both charge the pack as 
> well as island like any UPS to feed any critical loads in the house. I need 
> to see if it has the power saving setting where it is not always double 
> converting (wasting power) and just keeps the battery charged, but feeds the 
> incoming power through until there is a power loss, then it instantly starts 
> converting battery power to output without even losing the output.
> With such a setup, it would be possible to use solar in 2 ways: DC only to 
> directly charge the UPS batteries (but needs overcharge protection and waste 
> power as soon as batteries are full) or the usual string inverter generating 
> AC to feed back into the grid and independently run the UPS to keep the 
> batteries charged and generate uninterrupted power. Only drawback is that 
> during an outage, the solar inverter trips and does not generate power, but 
> this should happen only rarely.
> 
> Cor.
> 
> Sent from Mail for Windows 10
> 
> From: Robert Bruninga via EV
> Sent: Tuesday, August 13, 2019 7:06 PM
> To: Electric Vehicle Discussion List
> Cc: Robert Bruninga; jkenny23
> Subject: Re: [EVDL] FW: PowerWheels idea (Vehicle-to-home)
> 
> Thaniks.  Yes, I got it wrong.  I updated the web page .
> 
> So now a use leaf is about 2.3 power walls but a bit over half the price.
> Thanks for the tip.
> 
> bob
> 
> -----Original Message-----
> From: EV <ev-boun...@lists.evdl.org> On Behalf Of jkenny23 via EV
> Sent: Tuesday, August 13, 2019 6:31 PM
> To: ev@lists.evdl.org
> Cc: jkenny23 <jkenn...@gmail.com>
> Subject: Re: [EVDL] FW: PowerWheels idea (Vehicle-to-home)
> 
> Minor correction, your 3 year old Leaf is only 30kWH max (with less
> actually usable, limited by on-board BMS). It would only take a bit of
> clever reverse engineering to make use of ChaDeMo capable Leafs by
> controlling the contactor to close and feeding a high voltage solar grid
> tie inverter (I believe there are models that can use up to 400V already).
> Then you could use up to 20kW comfortably.
> 
> --
> Sent from: http://electric-vehicle-discussion-list.413529.n4.nabble.com/
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