I had to go off and educate myself on these terms, but its basically right on that label. The Voc is essentially the design max, and although it will rarely (if ever) actually produce that voltage the system needs to be designed to absorb that many volts.
Round up a bit, you have yourself a 48v panel there.
Well I think what you have there is a panel designed to go on a grid intertie system. No battery's involved so they can use alternate voltages.
Here is the back of a 12 volt 150 watt panel. 18.2 volts, 22.9 open circuit voltage, 8.2 amps
Not all who wander are lost... J.R.R. Tolkien
posted 1 month ago
Ok, awesome. Thanks yall! As great as these panels are wattage wise I want to stay in the 12-24 volt range. I feel like off grid consumption for low energy users such as ourselves simply due to the availability and price of those voltages in not only the solar world but truck driving/marine world. Do you agree?
Here's an example of how I do solar. The pic is a rotating array I built out of unistruts and schedule 40 steel pipe sunk in the ground. I'm using four grid-tie panels similar to the one described above that are wired in series to produce 120VDC. The raw 120VDC is run into my solar-only workshop system to charge a 24VDC battery bank. The MPPT controller transforms the raw 120VDC down to the 26-27VDC the battery needs to charge. The battery bank in turn fuels the 24V inverter than can produce pure sinewave 120/240VAC power. Sinewave is what you want for running sensitive electronics like TVs, stereos, and computers. In my case, sinewave is very good for electric motors, so I can run all my powertools with very clean AC.
If I rotate the array east in the morning, and westward in the afternoon, my array will produce 6-7kwh of power over the course of the day.
Dustin Talley wrote:Hey guys, I thought this was a 24v panel but its overwhelming my charge controller is 30v plus. Can you tell me the voltage of this panel? Thanks!
Hi Dustin. as mentioned already to use those panels you will have to change your charge controller to an mppt unit. Most of them require 1.5 times the battery bank voltage coming from the panels to work best. So usually on a 24 volt system, a 30 amp mppt controller with a peak string voltage of 150 volts would use 3 of those panels hooked in series putting out say 8 amps but at 90-120 volts... Mppt chargers allow for thinner wire from the array to the controller and much better charging on cloudy days. Panels that have voltages that match the battery voltage are usually reserved for smaller systems now a days.
mooooooo ..... tiny ad ....
Solar Station Construction Plans - now FREE for a while