First Relay In Solar Panel

This solar panel power switch circuit replaces the diode and connects the panel to battery through a relay contact.

First relay in solar panel.

This is the circuit from this webpage. As you see in the connection diagram at first the solar panel is connected to the solar charge controller and then a 24v battery is connected to the charge controller. When the voltage is high enough to engage the relay and the ldr receives enough light in order to open t1 the relay will switch and the battery will charge. If the panels are connected in series the voltage of each panel is added but the amperage stays the same.

When the power supply voltage is too low the relay is not on so the battery is not connected to the solar panel. Fusing solar panel arrays wired in parallel now in the case of 3 panels in series and 4 strings in parallel if one string shorts the max amperage to short is 39 12 which exceeds the 30 amp max current rating of the 10 awg wire. An inverter is connected to the battery. I have quite a collection of solar cells and solar panels most of them salvaged from solar garden lights rescued from the garbage.

The diode is used in relay to provide a path for discharging the stored energy in the relay magnetic coil when the power supply is removed from the relay coil. The size of this fuse is dependent on how many solar panels you have and how they are connected series parallel or series parallel. The output of the inverter is connected to ac loads like fans lights tv etc. The first part of a solar circuit is the solar cell or other device for collecting light and making use of it.

The relay must be of the correct specification. The diode used in solar panel for two reasons one is to bypass the current another is to block the reverse current flow to the solar panel from the battery. Relay connections connect the solar panel to the charge controller charge controller to the battery and battery to inverter through a relay as per the circuit diagram.