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Post by Tom bones on Dec 28, 2019 14:01:28 GMT
Im building a 48v system i have the renogy 100amp mppt but im looking at the 395w q cell panels.i plan on getting 6 of them for now but the question is they are 24v panels will i have to run them in sreies to charge a 48v battery bank or could i just run them in parallel.the voc on them says 40v max.
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Post by tattoo on Dec 28, 2019 14:33:10 GMT
It's my understanding that your CC will work with it hooked up either way it will adjust to gets what it needs.......
The Admin or others will chime in I'm Sure........
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Post by bupkis on Dec 28, 2019 17:53:28 GMT
series, you need at least 3 or maybe 4 in series depending on the panel specs.
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Post by goingoffgrid on Dec 28, 2019 18:27:53 GMT
You cant charge a 48V battery system from a 24V(?) solar input...why are you calling the panels 24 V if the Voc is 40V? You will need a series and parallel connection
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Post by Guest on Dec 30, 2019 7:46:15 GMT
You can charge a 48 volt battery with a 24 volt solar panel if your charge controller has a boost converter. Although, more than likely, with 6 panels, a series / parallel panel configuration is what the original poster is planning.
40 volts open circuit for a 24 volt panel, just like 20 volts for a 12 volt panel.
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Post by bupkis on Dec 30, 2019 15:06:59 GMT
do not confuse 'boost' battery charging mode with boost converter.
Which renogy CC have a boost converter?
60 cell '24v' panels don't have the over head voltage that 36 cell 12v panels do so for 48v battery charging use 3 in series.
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Post by goingoffgrid on Dec 30, 2019 22:26:10 GMT
You can charge a 48 volt battery with a 24 volt solar panel if your charge controller has a boost converter. Although, more than likely, with 6 panels, a series / parallel panel configuration is what the original poster is planning. 40 volts open circuit for a 24 volt panel, just like 20 volts for a 12 volt panel. The OP questioning series OR (not and) parallel, maybe I missed something....the OP needs to have 2- 3 panel series strings paralleled. As we all know parallel = higher current = higher gauge wire and higher losses. |
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Post by Admin on Jan 2, 2020 18:05:18 GMT
Im building a 48v system i have the renogy 100amp mppt but im looking at the 395w q cell panels.i plan on getting 6 of them for now but the question is they are 24v panels will i have to run them in sreies to charge a 48v battery bank or could i just run them in parallel.the voc on them says 40v max. The Renogy Rover 100A MPPT controller can accept maximum solar input voltage of 150 VDC (25°C) or 140 VDC (-25°C). This 100A MPPT controller can also accept a maximum solar input power of 5200W for a 48V system. If each of your panels is 24V and the battery bank you want to charge is 48V, then you would need to series them to increase the voltage and use the Voc of the panels to calculate the series connection volts and make sure those volts do not exceed the maximum input voltage of the controller. The Voc is bigger than the Vmp in solar panels, so it's important the Voc used in series calculations ends up not exceeding the max input voltage of controller. |
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Post by guest on Jan 2, 2020 23:50:49 GMT
do not confuse 'boost' battery charging mode with boost converter. Which renogy CC have a boost converter? 60 cell '24v' panels don't have the over head voltage that 36 cell 12v panels do so for 48v battery charging use 3 in series. Never said Renogy had a boost converter in their MPPT charge controllers. But, if it did, the OP could connect his 6 panels in parallel.
Looks like series / parallel is the way to go. Admin, thanks for clearing that up.
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Post by bupkis on Jan 3, 2020 13:48:17 GMT
I regret you take offense to my simple warning to those that have no idea about CC with boost converter and Renogy's use of 'boost' as a constant charge mode. There is no boost but there is power limiting by the CC cuz there is more than needed to keep constant voltage charging.
So whom does have said CC with boost converter, we want to know!
Never said you said anything!
OP, series strings of 3, not cuz Voc but because of 60 cell panels, series strings of 2 w/72 cell panels.
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