Specification: Hi there, I would like to construct something that would limit the amount of electricity that a 5kW solar energy system which I now have and would like to increase may send to the grid.
The problem I've been experiencing is that we need more solar panels in the colder months, nonetheless we generate much too much power in the height of summer.
We need about 10kW of solar panels to achieve electrical independence throughout winter time because we are limited to producing 5kW of electricity.
In order in order to restrict energy transferring to maybe 4kW, I was considering using a current coil to monitor the amount of electrical energy being sent and then slowly switching in resistive loads of maybe 750W each in order to absorb excess power.
Frequency management could be used in the current system to limit solar output, however during the summer, the total power output could reach excessively large. My power supply operates at 240V and 50Hz.
I was considering flipping in resistive loads with short time intervals and load sensing the changeover.
What do you think would be a practical and, ideally, simple approach to do this?
The layout
A simple and straightforward idea might be used to fulfill the aforementioned specifications:
As is well known, the IC LM3915's output pins respond to a rising voltage at pin #5, which ranges from 0 to 200 mV, by successively transferring low logic throughout its 10 output pins in an expanding fashion.
To achieve the desired approach the solar panel power load dump circuit above takes advantage of the IC's aforementioned functionality.
In this article we use a current detecting resistor Rx in place of a current transformer. The formula below might be used to get this resistor's number:
Rx = 0.1 / Max current limit
The maximum current that restrict for toggling the associated dump loads may be adjusted using the preset over the Rx.
In accordance with how much current is outputting from the solar panel, the outputs of the IC turn low in a progressive and appropriate manner when the voltage over Rx rises beyond the 0.1 V level as the current export surpasses the predefined limit.
The output load current is then reduced to the intended maximum limit as a result of the dump load lights starting to illuminate and shunting the additional watts to ground.
If necessary, the lighted lights might be submerged in water to heat it, allowing the extra power from the solar panels to be applied to this purpose or any other equivalent one.
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