Hi everyone, sorry I mostly lurk on this great mailing list but plan on changing that soon with the photo introduction of my own 12 kW DIY conversion soon.
Anyway i work with charge controllers a bit and thought i'd try an explain.
From my understanding higher voltages than your battery bank are fine and even desirable IF you are using an MPPT charge controller, which you should be.
I string my panels in series to much higher voltages (96v) before feeding em into a MPPT controller and it does a good job of finding the peak amps to deliver to the bank at the voltage of the bank. This is the way they are supposed to work from what I understand about them,
i.e. higher voltages are fine and more desirable to a point. so havin 24v panels or 48v series is good if your MPPT controller can handle it. Good because of less loss in cables.
On May 18, 2015, at 2:08 AM, "Kenneth Reese kcr@kcrproducts.com [electricboats]" <electricboats@yahoogroups.com> wrote:
Using 24v panels to charge 12 batteries does not make sense. Two panels the same size, same construction put out the same wattage. The 24v panel puts out half the amps as the same size 12v panel.If you use a 24v panel to charge a 12v battery, the charge controller will dump the extra power to limit the charging voltage that the battery is exposed to. Roughly the 24v panel will provide about 60% of the charging capability of the 12v panel.On Sun, May 17, 2015 at 11:15 PM, oak oak_box@yahoo.com [electricboats] <electricboats@yahoogroups.com> wrote:
There was a recent post referencing 24V solar panels that got my curiosity up.So it looks like it's possible to buy 100W 24V panels for under $200.I then took a look at a MTTP charge controller for 12/24V.Though it looked like one of the charge controllers I looked at had a 20V max input voltage for charging a 12V bank. That seemed a little low.I had actually already started wondering if the norm was to use 24V solar arrays, run it through a controller, and use it to charge a 12V battery bank. The idea being that a 24V array may not always put out 24V, but would hopefully put out enough to charge a 12V bank for a much broader range of time, and using a charge controller, it would be no problem.Forgive my ignorance of solar systems - but would it make sense to use a 24V panel with a 12V battery?John
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Posted by: Rumi Humphrey <rumi.humphrey@gmail.com>
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