By and large, absolute power is not that important, but the perfectionist inside demands it…
It is possible to make the power readings on the regulator and on the Samovar match, and essentially there is only one method.
None of the regulators, the Samovar included, measures power. They calculate it, like calculators, from two values: the voltage currently applied to the heater and the resistance value entered for that heater.
The entered resistance is constant, while the voltage changes. All the setup comes down to choosing the right heater resistance value.
You can use the calculated resistance: voltage squared divided by power. The voltage is taken from the nameplate on the heating element. Example for a 3 kW, 220 V heating element: 220*220/3000=16,13333333333 Ohm.
Or measure it with a multimeter.
For the RMVk and Simple regulators built from Chinese modules (Stab-avr).
Attention! If you are not actually going to heat the boiler, disconnect the heater.
– In the RMVk you can enter the power and voltage values, and the resistance will be calculated automatically. Or enter the resistance and the power will be calculated.
Do this, and don’t forget to switch the regulator to watts display mode.
– In the Stab-avr, use the potentiometer to set the actual mains voltage at the moment and enter the power value of your heater.
Start the Samovar heating. In the Acceleration mode there is no point in adjusting anything, because the voltage will keep changing all the time, and the power with it. Give a command from the Samovar to set some specific voltage on the regulator (say, 170 volts for the RMVk, or 2000 watts for the Stab-avr). The regulators will switch to stabilization mode.
Compare the power values displayed in the Samovar and on the regulator.
Now there are two ways: either change the resistance value in the Samovar (WEB interface: HOME – Settings – Main – Other tab), which is much more convenient, or change the power value entered in the regulator. The goal is to get the values on the regulator and in the Samovar as close as possible.
The Kvic regulator . Has no power readout (for which it deserves praise :), fewer headaches with setup ).
So only the Samovar is adjusted, to the power you want to see…
That is the first option.
The second is to use a chain: a separate volt-ammeter — regulator — Samovar.
This is convenient if different heating elements are used from time to time and/or the heating elements of the heating element assembly itself are switched.
The volt-ammeter actually measures the current drawn and shows the real power on its display. So if you want the Samovar to show that power, just quickly change the heater resistance value in the Samovar.
The original article is located here