question

gregoryc38 avatar image
gregoryc38 asked

Charging / discharging while load consumption fluctuate

Hello everybody,


I'm fi ally posting here because we have been unable to understand an issue we are facing.


Our configuration is like this :

  • Three phases, 1 inverter per phase plus 1 Color Control for the 3 inverters

  • The Grid and PV panels are connected on the inverters inputs AC In

  • The load is connected on S1

  • We have a 10kW battery pack on the DC bus


The inverters are set in ESS mode and we are setting the grid septpoint to charge / discharge the battery remotely via modbus and the Color control.


What happen is that the load is equipped with solid state relays used to control the temperature of heating wires. Though when we start the heat, the power consumption of the load is very unstable (due to the operation of the solid state relays) and unbalanced on the three phases.

At this moment we lose the control of the battery charge / discharge, no matter what grid setpoint we set, the power on the DC bus keep fluctuating from charge to discharge with no pattern and end up by emptying the battery.


However when we stop heating, every thing is operating perfectly well. We are able to charge / discharge the battery by setting the grid setpoint.


I was wondering if someone has already faced and solved this kind of issue?


Thank you by advance :)


Gregory

battery chargingCCGX Color Control
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2 Answers
boekel avatar image
boekel answered ·

A little more info would help

what size inverters?
what power is the load?
duty cycle?
what power meter?

Did a Victron specialist look into the settings?
Can you use pwm control for the heating element instead of on/off?

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basreflex avatar image
basreflex answered ·

the solidstate relays could be of the zero crossing switching type. such that the thermostat skips cycles here and there. not nice for the inverter. PWM control seems better, phase control like triac dimmer style could be even worse. a 10kW battery pack seems a bit small for a 3phase configuration, usch that the battery does drop the voltage when a load is suddenly connected.

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