techn0
Solar Newcomer
Posts: 1
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Post by techn0 on Feb 17, 2020 3:44:33 GMT
I am interested in purchasing the 600 watt Premium Kit and looking at the diagram, I am trying to understand how the PV voltage is not exceeded with the series and parallel configuration with the 40A MPPT? It appears that two set of panels are wired in series and then the two sets in parallel. Also, it shows that it is connected to 12v batteries? Can someone please help me understand this a little better? I want to be able to use this premium kit with my 12V lithium batteries. Thanks in advance. RNG-KIT-PREMIUM600D-RVR40_wire_diagram__19....webp (155.19 KB) |
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Post by bupkis on Feb 17, 2020 11:46:50 GMT
"A buck converter is a DC-to-DC power converter which steps down voltage from its input to its output. "
the controller can handle either 100vDC or 150vDc input, it then 'bucks' this power to that appropriate for a battery.
Several battery types are selectable, each having its own built in charge profile.
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russ
Solar Advocate
Posts: 63
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Post by russ on Feb 19, 2020 1:31:38 GMT
I am interested in purchasing the 600 watt Premium Kit and looking at the diagram, I am trying to understand how the PV voltage is not exceeded with the series and parallel configuration with the 40A MPPT? It appears that two set of panels are wired in series and then the two sets in parallel. Also, it shows that it is connected to 12v batteries? Can someone please help me understand this a little better? I want to be able to use this premium kit with my 12V lithium batteries. Thanks in advance. I am assuming that this is the system you are referring to.
A MPPT charge controller can take higher voltage voltage from solar panels and convert it to the voltage that the batteries need. Doing this efficiently, the MPPT charge controller will lower the voltage and raise the current. Search the internet for MPPT charge controller for a better explanation.
The diagram I linked to shows 6 panels, each about 20 volts no load. They are wired in two pairs of three in series (for about 60 volts) and the two pairs are in parallel. That means the charge controller will see about 60 volts at twice the current a single panel will produce.
Each string of three panels will triple the voltage, but the current will stay the same as one panel. The two strings of three panels are in parallel so voltage stays the same as one string (60 volts) but the current doubles. The charge controller can take up to 100 volts on the input.
The higher voltage is good for the wiring because the wire size is determined by the current not the voltage.
The 12 volt batteries in the diagram are in series, so the voltage to the charge controller from the batteries is 24 volts. The charge controller is capable of converting the higher voltage to the lower voltage efficiently.
The usable battery bank voltage with this system is 24 volts.
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Post by Admin on Feb 19, 2020 17:43:02 GMT
I am interested in purchasing the 600 watt Premium Kit and looking at the diagram, I am trying to understand how the PV voltage is not exceeded with the series and parallel configuration with the 40A MPPT? It appears that two set of panels are wired in series and then the two sets in parallel. Also, it shows that it is connected to 12v batteries? Can someone please help me understand this a little better? I want to be able to use this premium kit with my 12V lithium batteries. Thanks in advance. View AttachmentThe 12V batteries shown on the diagram are connected in series, so it is actually showing a 24V battery bank. The panels shown in the diagram are connected in series-parallel, two strings of 3 panels connected in series connected in parallel. The PV voltage from these connected panels would be roughly 60V and the total amp current would be roughly about 12A. The Rover 40A MPPT controller can accept a maximum PV input voltage of up to 100V, up to 520W of PV input power for a 12V battery bank and up to 1040W of PV input power for a 24V battery bank, so for this 600W kit, you would need to have a 24V battery bank if you are using the Rover 40A MPPT controller. MPPT charge controllers are designed for larger systems and for higher voltage input from solar panels. -Renogy Team |
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