EV car charge with PV

mgerhard74 · Post by **mgerhard74** » Sunday 20 May 2018 8:37

I use Domoticz to improve my PV ownconsumtion and charge our new EV car (Nissan Leaf ZE1) with photovoltaic power.
A raspberry pi3, a Razberry board, some z-wave plugs and a TCP/IP controllable EV wallbox (with a Phoenix Contact EM-CP-PP-ETH charge control) is my hardware setup. I read data from the Fronius inverter with http requests (LUA Script) and control the EV wallbox also with a short LUA script to send TCP modbus commands. Charging power can be set from 6A (1,4kW) to 20A (4,6kW) in 2A steps. Since march we charged 270kWh green energy into the Leaf.

: AllPics.jpg (382.28 KiB) Viewed 2927 times

: 2018-05-19.JPG (69.98 KiB) Viewed 2927 times

jake · Post by **jake** » Sunday 20 May 2018 16:34

Interesting. Can you see how effectively you harvest your pv energy in your car? Can you keep the energy pull from the grid close to zero during charging?

mgerhard74 · Post by **mgerhard74** » Sunday 20 May 2018 17:21

Hello Jake, difficult to answer, because some other devices are taking enery of PV: fridge, pool pump, washing machine, wifi routers, cooking,....
In fact, the LUA script can react on taking enery from the grid. In my case, i decrease charging current on power consumption is greater than 200 watt. Easy to change this value to 0. So no grid power will charge the car.
Our PV ownconsumtion rate decrease from about 33% to 42% in april and 55% in may. Every kilometer of our Nissan Leaf is free. (and of course free of fuel and co2)

Gerhard

Code: Select all

-- ---------------------------------------------------------------------
-- Control of EV Wallbox with Phoenix Contact EM-CP-PP-ETH
-- How to install mbtget: https://github.com/sourceperl/mbtget
-- IP-address of Phoenix Contact EM-CP-PP-ETH: 10.0.0.150
-- Turn charge on or off; change current from 6 to 20 ampere
-- (c) 2018, Ing. Gerhard Mitterbaur
-- ---------------------------------------------------------------------

local nSmartmeter = 0
Debug = "YES"                        -- turn debugging on "YES" or off "NO"

commandArray = {}

nSmartmeter= tonumber(otherdevices_svalues['Smartmeter'])

if (otherdevices['7 Wallbox'] == 'On') then
    if Debug=="YES" then
        print ("Smartmeter: " ..tostring(nSmartmeter))
    end

    -- Very high photovoltaic power
    if (nSmartmeter < -1300) then
        if (uservariables["WallboxOn"] == 0) then
            -- Start charge EV
            os.execute("mbtget -a 400 -u 180 -w5 1 10.0.0.150")
            -- Current 6A (1400 Watt)
            os.execute("mbtget -a 300 -u 180 -w6 6 10.0.0.150")
            commandArray['Variable:WallboxOn'] = "1"
            commandArray['Variable:WallboxAmpere'] = "6"
            commandArray['Variable:WallboxOffCount'] = "0"
        end
    end
    
    -- high photovoltaic power, Wallbox is still "on", increase charge
    if (nSmartmeter < -400) then
        if (uservariables["WallboxOn"] == 1) then
            -- Start charge EV
            os.execute("mbtget -a 400 -u 180 -w5 1 10.0.0.150")
            commandArray['Variable:WallboxOffCount'] = "0"
            if (uservariables["WallboxAmpere"] == 6) then
                -- Current 8A
                os.execute("mbtget -a 300 -u 180 -w6 8 10.0.0.150")
                commandArray['Variable:WallboxAmpere'] = "8"
            elseif (uservariables["WallboxAmpere"] == 8) then
                -- Current 10A
                os.execute("mbtget -a 300 -u 180 -w6 10 10.0.0.150")
                commandArray['Variable:WallboxAmpere'] = "10"
            elseif (uservariables["WallboxAmpere"] == 10) then
                -- Current 12A
                os.execute("mbtget -a 300 -u 180 -w6 12 10.0.0.150")
                commandArray['Variable:WallboxAmpere'] = "12"
            elseif (uservariables["WallboxAmpere"] == 12) then
                -- Current 14A
                os.execute("mbtget -a 300 -u 180 -w6 14 10.0.0.150")
                commandArray['Variable:WallboxAmpere'] = "14"
            elseif (uservariables["WallboxAmpere"] == 14) then
                -- Current 16A
                os.execute("mbtget -a 300 -u 180 -w6 16 10.0.0.150")
                commandArray['Variable:WallboxAmpere'] = "16"
            elseif (uservariables["WallboxAmpere"] == 16) then
                -- Current 18A
                os.execute("mbtget -a 300 -u 180 -w6 18 10.0.0.150")
                commandArray['Variable:WallboxAmpere'] = "18"
            end
            elseif (uservariables["WallboxAmpere"] == 18) then
                -- Current 20A
                os.execute("mbtget -a 300 -u 180 -w6 20 10.0.0.150")
                commandArray['Variable:WallboxAmpere'] = "20"
            end
        end
    end

    -- low photovoltaic power, decrease charge
    if (nSmartmeter > 200) then
        if (uservariables["WallboxOn"] == 1) then
            if (uservariables["WallboxAmpere"] == 20) then
                -- Current 18A
                os.execute("mbtget -a 300 -u 180 -w6 18 10.0.0.150")
                commandArray['Variable:WallboxAmpere'] = "18"
            elseif (uservariables["WallboxAmpere"] == 18) then
                -- Current 16A
                os.execute("mbtget -a 300 -u 180 -w6 16 10.0.0.150")
                commandArray['Variable:WallboxAmpere'] = "16"
            elseif (uservariables["WallboxAmpere"] == 16) then
                -- Current 14A
                os.execute("mbtget -a 300 -u 180 -w6 14 10.0.0.150")
                commandArray['Variable:WallboxAmpere'] = "14"
            elseif (uservariables["WallboxAmpere"] == 14) then
                -- Current 12A
                os.execute("mbtget -a 300 -u 180 -w6 12 10.0.0.150")
                commandArray['Variable:WallboxAmpere'] = "12"
            elseif (uservariables["WallboxAmpere"] == 12) then
                -- Current 10A
                os.execute("mbtget -a 300 -u 180 -w6 10 10.0.0.150")
                commandArray['Variable:WallboxAmpere'] = "10"
            elseif (uservariables["WallboxAmpere"] == 10) then
                -- Current 8A
                os.execute("mbtget -a 300 -u 180 -w6 8 10.0.0.150")
                commandArray['Variable:WallboxAmpere'] = "8"
            elseif (uservariables["WallboxAmpere"] == 8) then
                -- Current 6A
                os.execute("mbtget -a 300 -u 180 -w6 6 10.0.0.150")
                commandArray['Variable:WallboxAmpere'] = "6"
            end
        end
    end

    -- very low photovoltaic power, stop charge
    if (nSmartmeter > 500) then
        if (uservariables["WallboxOn"] == 1) then
            if (uservariables["WallboxAmpere"] == 6) then
                -- Count to 5 before turn off charging
                if (uservariables["WallboxOffCount"] == 0) then
                    commandArray['Variable:WallboxOffCount'] = "1"
                elseif (uservariables["WallboxOffCount"] == 1) then
                    commandArray['Variable:WallboxOffCount'] = "2"
                elseif (uservariables["WallboxOffCount"] == 2) then
                    commandArray['Variable:WallboxOffCount'] = "3"
                elseif (uservariables["WallboxOffCount"] == 3) then
                    commandArray['Variable:WallboxOffCount'] = "4"
                elseif (uservariables["WallboxOffCount"] == 4) then
                    commandArray['Variable:WallboxOffCount'] = "5"
                elseif (uservariables["WallboxOffCount"] == 5) then                    
                    -- Stop charge EV
                    os.execute("mbtget -a 400 -u 180 -w5 0 10.0.0.150")
                    commandArray['Variable:WallboxAmpere'] = "0"
                    commandArray['Variable:WallboxOn'] = "0"
                    commandArray['Variable:WallboxOffCount'] = "0"
                end
            end
        end
    end

else
    -- Current 16A
    os.execute("mbtget -a 300 -u 180 -w6 16 10.0.0.150")
    -- Switch Wallbox to OFF: stop charge 
    os.execute("mbtget -a 400 -u 180 -w5 0 10.0.0.150")
    commandArray['Variable:WallboxAmpere'] = "0"
    commandArray['Variable:WallboxOn'] = "0"
    commandArray['Variable:WallboxOffCount'] = "0"
end

if Debug=="YES" then
        print ("Wallbox on/off " .. uservariables["WallboxOn"])
        print ("Wallbox Ampere " .. uservariables["WallboxAmpere"])
        print ("Wallbox Off Count " .. uservariables["WallboxOffCount"])
    end

return commandArray

And a picture of our Nissan Leaf:

: Bild 3 Von vorne.JPG (263.41 KiB) Viewed 2902 times

lost · Post by **lost** » Monday 21 May 2018 8:00

Hello,

mgerhard74 wrote: ↑Sunday 20 May 2018 17:21 Our PV ownconsumtion rate decrease from about 33% to 42% in april and 55% in may. Every kilometer of our Nissan Leaf is free. (and of course free of fuel and co2)

Well, as usual, free until you consider all the energy that was used for battery manufacturing and needed ore extraction... Same for PV panels: several 10's of sq-meters resulting from another heavy energy eater, silicon foundry. Lets' not speak about recycling side.

A few years ago, PV was indeed considered such a waste that it was only considered to electrify areas that could not be wired easily to the public electric network! Now governments give money for equipments that will struggle for decades to just give back the energy that was needed to manufacture them, provided you don't have an heavy wind or hail period that'll break everything. As well as for electric cars that overweight their fuel counterparts by 30% in average.

This is just crazy.

If you consider a french Renault Zoe (maybe the most successful electric car in Fra,ce: A city car weighting 1450kg!) compared to a suzuki swift (another city car, with current generation at 900kg in average after loosing 150kg since last generation), that can be up to 60% overweight for the electric version that will only allow you to drive 200/300km!

=> With current PV and battery tech, it's everything but CO2 free.

The only interest is money: Buying your next 2 decades electricity once now (if you're lucky), at current energy cost that drive PV panels/battery manufacturing costs. As energy will cost more and more, you main save money.

But in the end, if everyone does the same, this will just accelerate our current problems.

An effort on current average car weight and aerodynamics (forget SUV's and such small dick compensators, as marketing guys qualify them in the automotive industry!) with current engine technology could do the job of an electric counterpart for half the weight at 3 to 5l/100km fuel consumption.

The miracle electric battery tech, we still wait for it since the very first electric car, named "Jamais Contente" (="Never Happy"!):
https://fr.wikipedia.org/wiki/La_Jamais_contente

psubiaco · Post by **psubiaco** » Wednesday 31 March 2021 23:40

Hi Gerhard,
well done!
Can you suggest a cheap and powerful wallbox that can be controlled by UDP/IP or TCP/IP ?
I have to do the same as you, already have energy meter measuring the import/export power from grid, and want to charge the BEV car (Kia e-Niro) with max 5-7kW power, monophase.
Thanks a lot.
Paolo

mgerhard74 · Post by **mgerhard74** » Friday 09 April 2021 19:15

Hi Paolo,
Sorry for the delay. I use a simple wallbox from a local company. The main part is a Phoenix Contact EM-CP-PP-ETH charge control, a power meter is optional, a residual current circuit breaker and a 3-phase relay. A key switch can start charge manualy. Some Leds at the front. (Charge, connect, failure)

In Domoticz:
Install mbtget: https://github.com/sourceperl/mbtget
Ip of my charge control is 10.0.0.150
Lua Script to start charge at 1400Watt:
os.execute("mbtget -a 400 -u 180 -w5 1 10.0.0.150")
os.execute("mbtget -a 300 -u 180 -w6 6 10.0.0.150")

Switch to 8A:
os.execute("mbtget -a 300 -u 180 -w6 8 10.0.0.150")

Stop charge:
os.execute("mbtget -a 400 -u 180 -w5 0 10.0.0.150")

: wallbox_inside.jpg (86.56 KiB) Viewed 1580 times

Gerhard

Darkneo · Post by **Darkneo** » Thursday 01 July 2021 13:41

Hi and thanks for this topic!

Even quite old, I am really interested in it! It is quite an anticipation as: 1° I do not yet have my EV Leaf and 2° I do not have my photovoltaic power (kind of delay due to a virus, you might have heard about that

)

The first step I am trying to clarify is the hardware part: why are you talking about RPI2, Razberry etc in the first topic? Because in your last post, seems like the only needed hardware is the charge control, no?

And what's the soft config? Only the LUA Script you provided (with mbtget) or is there anything to add?

To share my actual project: I would like to adapt my EVBOX Elvi power according the house consumption at a very first step (in order to avoid consumming to much power for charging the car if the air conditionner is on, for example). Then, once my photovoltaic power will be installed, I will do the same, but adding the photovoltaic power as another variable to be considered in the EVBOX power delivered.

Thanks in advance for your help and clarification

mgerhard74 · Post by **mgerhard74** » Thursday 26 August 2021 16:45

Hi, i use a RPI3. The razberry board is only neccessary to control z-wave devices. (plugs, thermostats,....)
So you need a RPI3, you must have the smartmeter value or PV energy value to control the EV charge unit. The main part of the charge unit is a Phoenix Contact EM-CP-PP-ETH charge control.

EV car charge with PV

EV car charge with PV

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