What are the 24v solar panels.
Why are some solar panels 24v.
So a 36 cell solar panel is called a 12v nominal panel as it is designed to charge a 12v battery.
Since each panel is 12v and the battery bank you want to charge is 24v then you need to series your system to increase the voltage.
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Some manufacturers name the optimum voltage as vmax.
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The reduction in wire size cuts down the costs as the thicker the wire the more costly it is.
This was achieved by using 12v or 24v appliances lighting that do not require an inverter.
The optimum working voltage can be limited with a resistor that takes the absolute voc edge off.
Let s look at a numerical example.
Here 24v is different from open circuit voltage voc.
Say you have 2 x 100 watt solar panels and a 24v battery bank.
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The 24v solar panel means that the optimum output voltage of the solar panel is 24v at stc.
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Likewise a solar panel with twice as many cells 72 cells outputs about 36 volts and it is great for charging a 24v battery bank.
So it is called.
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You got it a 24v nominal solar panel.
In the past we tried to reduce the cost of an off grid system by limiting its size.
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This is so because increasing the voltage of a system causes a reduction in the current through it and in turn reduces the size of the wires you need.
Thus a string of 3 nominally 24v panels can be used to charge a 12v battery with reduced losses in the solar panel cables.
Another advantage of using an mppt charger is that they are often rated for higher panel voltages and may be suited for a range of battery voltages often automatically configuring for the connected battery system.