I have 4/150W Renogy panels RNG-150DP max150WV of 22.5VI sc 9.05AV mp 8.38AMax system Voltage 600VDC (UL)Max Fuse Rating 15ACan someone please walk me true the meaning of the individual ratings meaning.I understand that they are 150W 12V . What does the 600VDC particularly mean, I guess it has to do with how many panels can be joined?Thanks Frank.

Yes, it means the max voltage if connected in series. As least that's what I think it means. Only the last panel of about 35 in the string would reach that.

2oldman is correct.https://www.altestore.com/blog/2016/04/how-do-i-read-specifications-of-my-solar-panel/#.YF1XItxME2wOpen Circuit Voltage (Voc)Open circuit voltage is how many volts the solar panel outputs with no load on it. If you just measure with a voltmeter across the plus and minus leads, you will read Voc. Since the solar panel isn’t connected to anything, there is no load on it, and it is producing no current.Maximum Power Point (Pmax)The Pmax is the sweet spot of the solar panel power output, located at the “knee” of the curves in the graph above. It is where the combination of the volts and amps results in the highest wattage (Volts x Amps = Watts).V of 22.5V nominal voltage of the panel--probably best to use MPPT controller with this. If the controller can tolerate a 45 volt input, I'd wire in series/parallel.Isc short circuit current.

Voc is the open circuit voltage and adds for series connected panels. Isc is the maximum amps from a panel when using a PWM controller. Vmp (which is 17.9V, you have a typo) is the voltage at maximum power - ie 17.9V*8.38A = 150W.

This might be what you are looking for--it is not all about fuses. Scroll down to the diagrams of various ways they hook up the panels and how that affects things.https://www.eaton.com/content/dam/eaton/products/electrical-circuit-protection/fuses/bussmann-series-photovoltaic-fuses/bus-ele-an-10191-pv-app-guide.pdf

While the Eaton manual has a lot of good information for large grid applications it may not be the best guide for smaller RV installations. Fusing both the + and - wires is one example. But it can trigger thoughts, questions and understanding.

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pianotuna
Nomad III
Mar 26, 2021
2oldman is correct.

https://www.altestore.com/blog/2016/04/how-do-i-read-specifications-of-my-solar-panel/#.YF1XItxME2w

Open Circuit Voltage (Voc)

Open circuit voltage is how many volts the solar panel outputs with no load on it. If you just measure with a voltmeter across the plus and minus leads, you will read Voc. Since the solar panel isn’t connected to anything, there is no load on it, and it is producing no current.

Maximum Power Point (Pmax)

The Pmax is the sweet spot of the solar panel power output, located at the “knee” of the curves in the graph above. It is where the combination of the volts and amps results in the highest wattage (Volts x Amps = Watts).

V of 22.5V nominal voltage of the panel--probably best to use MPPT controller with this. If the controller can tolerate a 45 volt input, I'd wire in series/parallel.

Isc short circuit current.
2oldman
Explorer II
Mar 26, 2021
Yes, it means the max voltage if connected in series. As least that's what I think it means. Only the last panel of about 35 in the string would reach that.

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