Avoid "Optimizers" like the plague!
They generate horrendous radio frquency interference, blocking AM and
Shortwave and Ham raido HF communication for blocks. It cannot be fixed
without removing every panel and re-doiong all the HV wiring into twisted
pairs and having RFI chokes on every wire
Related question:
I have solar panels, but they each have a DC optimizer on them
(basically does MPPT and production level measurement on a per panel
basis, but sends DC down to the wall mounted inverter).
When the grid is down, the (Solar Edge SE 10KW) inverter shuts down, and
the DC
Peri Hartman via EV wrote:
Well, if it's current that varies, it makes sense. Maybe I
misunderstood, but your prior post says "any voltage from 0 up to...".
Bob is right; PV panels do behave somewhat like a current source. If you
look at a graph of voltage vs. current at some fixed light
e battery is up to max voltage, you need to disconnect or you will
> destroy the cells.
>
> Peri
>
> -- Original Message --
> From: "Robert Bruninga via EV"
> To: "Electric Vehicle Discussion List"
> Cc: "Robert Bruninga"
> Sent: 0
Sent: 02-Sep-19 8:31:26 AM
Subject: Re: [EVDL] V2G for my grid tied solar? (constant current
charging)
Solar cells are current sources. Their current is linear with light
level not the voltage. The voltage is between about 0.55 volts per
cell under no load, down to about 0.45 volts un
to disconnect or you will
destroy the cells.
Peri
-- Original Message --
From: "Robert Bruninga via EV"
To: "Electric Vehicle Discussion List"
Cc: "Robert Bruninga"
Sent: 02-Sep-19 7:20:27 AM
Subject: Re: [EVDL] V2G for my grid tied solar? (constant current
One final point about grid down charging (under a must have armagedon
scenario): (And only for those fully experienced in HVDC)
Remember that Solar panels are current limited power sources. This means
It will provide its rated current at ANY voltage from 0 (short circuit) up
to its nominal
Again, if you find a 72v UPS (6 12v batteries) then you can tap your
arrays in groups of three and use that to provide the current to the UPS to
dirive your car charger. Just 9 panels in 3 parallel strings of 90v will
give maybe 20 amps (or the minimum needed to charge L1) But 12 panels (or
This is probably overkill for your particular needs, as it is based on
Tesla Model 3 cars, but here is the URL of a recent talk I gave on V2G:
https://staff.washington.edu/larryg/Energy/SEVA-V2G.pptx
On Sun, Sep 1, 2019 at 9:28 AM Damon Henry via EV wrote:
> I know there has been a lot of
On 9/1/19 1:10 PM, Willie wrote:
Here is some discussion of augmenting a microgrid (or real grid) with EV
12v:
I don't know where that come from
https://teslamotorsclub.com/tmc/threads/audio-album-artwork-not-appearing.12635/
Maybe this will be the right one:
On 9/1/19 11:28 AM, Damon Henry via EV wrote:
I know there has been a lot of churn the last few years over Vehicle to Grid
technology. I'm not sure how many people really want the utilities to take
over their vehicle state of charge, so I'm not sure how viable the whole
concept is.
With
You already have what you need for continuous operation at night in the 1
kW class (refrigerator, well pump and lights, etc)
See http://aprs.org/powerwheels.html
But it assumes you have the Sunny Boy GT inverter with "secure" power when
the grid goes down to charge your EV. $1500
Or if you are
I know there has been a lot of churn the last few years over Vehicle to Grid
technology. I'm not sure how many people really want the utilities to take
over their vehicle state of charge, so I'm not sure how viable the whole
concept is.
With my grid tied solar system my solar stops producing
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