I am installing two 12 V 100w solar panels to a Renogy DCC50s 12v 50A DC-DC Solar controller. The solar controller manual says that it has a maximum of 25 V input. When I wire the panels in series I get 39 V so I assume I have to wire these panels in parallel to get the voltage below 25 V. Or am I missing something, am I to designed the system for open current voltage (around 21.8v per panel) or nominal voltage (12v per panel). And why would they call these 12 V panels when they’re actually putting out way more than 12 V? Thanks all for your help
Solar controller question
- Thread starter stu
- Start date
Rednecktek
Solar Wizard
Yes, you'll need to wire them in parallel.
As for the "12v" panels, it's a marketing term. Since controllers need a few volts over the battery, and the charging voltage on a 12v battery is usually in the 13.8v range, what it means is that "This panel produces enough voltage to charge a 12v nominal system, but not a 24v or 48v." Likewise a "24v panel" can produce enough voltage to charge a 24v or 12v nominal system, but not a 48v."
Does that make sense?
As for the "12v" panels, it's a marketing term. Since controllers need a few volts over the battery, and the charging voltage on a 12v battery is usually in the 13.8v range, what it means is that "This panel produces enough voltage to charge a 12v nominal system, but not a 24v or 48v." Likewise a "24v panel" can produce enough voltage to charge a 24v or 12v nominal system, but not a 48v."
Does that make sense?
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