A frequent customer asks us how we can implement a simple yet smart solution to charge an electric car only at the cheapest electricity tariff, using Nordpool electricity exchange prices.
The answer is very simple. This solution can be used not only for charging electric cars, but also for heating water or other needs.
The operating principle is quite simple. The smart relay controls the contact, switches on/off according to the script, and has to control the CP contact at the charging station.
Script
let CONFIG = {
api_endpoint: "https://dashboard.elering.ee/api/nps/price/lt/current",
switchId: 0, // Jūsų rėlės ID. Jeigu vieno kontakto, bus 0. Jeigu kelių, pagal numerį
price_limit: 200, // EUR/MWh. Svarbu, kaina be PVM.
update_time: 60000, // 1 minutė. Kas kiek laiko tikrinsime kainas ?
reverse_switching: false // Įjungia rėlę, jeigu atitinka Jūsų kainą, jeigu ne, išjungia.
};
let current_price = null;
let last_hour = null;
let last_price = null;
let state = null;
function getCurrentPrice() {
Shelly.call(
"http.get",
{
url: CONFIG.api_endpoint,
},
function (response, error_code, error_message) {
if (error_code !== 0) {
print(error_message);
return;
}
current_price = JSON.parse(response.body).data[0]["price"];
print("Updated current price!");
}
);
}
function changeSwitchState(state) {
let state = state;
if(state === false) {
print("Switching off!");
} else if(state === true) {
print("Switching on!");
} else {
print("Unknown state");
}
Shelly.call(
"Switch.Set",
{
id: CONFIG.switchId,
on: state,
},
function (response, error_code, error_message) {
if (error_code !== 0) {
print(error_message);
return;
}
}
);
}
Timer.set(CONFIG.update_time, true, function (userdata) {
Shelly.call("Sys.GetStatus", {}, function (resp, error_code, error_message) {
if (error_code !== 0) {
print(error_message);
return;
} else {
let hour = resp.time[0] + resp.time[1];
//atnaujiname kainas
if (last_hour !== hour) {
print("update hour");
last_hour = hour;
getCurrentPrice();
}
//Tinkriname ar nustatyta kaina
if (current_price !== null) {
//Standartinis ijungimas. Išjungiame, jeigu virisijame limita
if(CONFIG.reverse_switching === false) {
if (current_price >= CONFIG.price_limit) {
//isjungiame, jeigu virs limito
changeSwitchState(false);
} else {
//ijungiame, jeigu tenkina salygas limito
changeSwitchState(true);
}
}
//reversinis variantas.
if(CONFIG.reverse_switching === true) {
if (current_price >= CONFIG.price_limit) {
//ijungiame, jeigu netenkina limito salygos
changeSwitchState(true);
} else {
//isjungiame, jeigu tenkina limito salygas
changeSwitchState(false);
}
}
} else {
print("Current price is null. Waiting for price update!");
}
print(current_price);
}
});
});
You will need a smart relay, we recommend the Shelly smart relay. After connecting directly to the relay, under Scripts, copy the script itself, and don’t forget to run the script after saving it.
-
ABB Terra DC Wallbox 22,5 kW CCS2 + Chademo
€11,495.00 -
ABL eMH1 Basic 11kW
€292.82 – €338.80 -
Adapter CEE 32 A 3 phase to CEE 32 A 1 phase
€29.04 -
Adapter CEE 32 A from 3 phases to CEE 16 A
Original price was: €35.09.€29.04Current price is: €29.04. -
Alpitronic Hypercharger HYC150 DC
€60,487.90 -
Alpitronic Hypercharger HYC50 DC Wallbox
€20,570.00 -
Aluminium stand for charging station
€238.37 -
Bluetooth tag pendant
Original price was: €7.26.€5.45Current price is: €5.45. -
Charging cable Type1 – Type2 32A 5m
Original price was: €187.55.€148.83Current price is: €148.83.