Yes, a 36-volt solar panel can charge a 12-volt battery, but it's not an optimal setup. For instance, if you have a 36-volt panel that is 5 amps (36v*5a=180watt), connecting it directly to a 12-volt battery while charging will result in the battery holding a voltage of 12 volts.
So, for example, let's say you put two 18V 100W panels in series, which will give you ~5.5A at 36V. You could then wire one 36V panel parallel to the string of two 18volters because they are both putting out the same voltage. How many watts is that 36V panel? Let's say for example that it is a 300W panel putting out 8.33A at 36V.
A 12-volt battery, like a Lead Acid Battery, is a voltage source, holding approximately 12 volts across its terminals. Solar panels, on the other hand, are current sources. Their output current is proportional to the amount of sunlight hitting the panels, around 1,000 Watts per square meter on a clear day at solar noon with panels pointing directly at the sun.
So, your two parallel strings would be 5.5A at 36V and 8.33A at 36V, for a total of 13.83A at 36V. That is equal to 498W of panels total. 498W/13V charging = 38.3A. So, that combination would be OK for your controller, because the max amperage is less than 40. Now, what if you have three 18V panels?
The panels will deliver 36v ". This suggests to me that you could either be removing the 18V panels and replacing them with an unknown number of 36V panels, or alternatively adding new 36V panels along side the original panels. Both are still doable, but with caveats mentioned above.
No Problem. The Solar Charge Controller (SCC) will take a maximum voltage & amperage in from the solar panels. It does not care about the solar panels as such but only the Maximum Volts & Amps they output collectively. This should be clearly shown in the docs for the SCC.
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I was told most panels are 12v and that i would need 3 panels to make the 36v. I was bummed then i search 36v solar panels. Found one not too badly priced. Can i hook a 36v panel to help my golf cart? And...should i get an 80watt or a 200watt panel? Any thoughts Also, do i need a charge controller for a golf cart?...if anyone might know Golf ...
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