Adding Wind Turbine To My 12VDC Solar System?

 With that large of a battery bank (and without preaching about parallel strings) You need something like 90+ charging amps to properly maintain those batteries. It looks like you currently have about 28 amps on a good day.

 You should have your 12 volt panels series wired, two at a time to bring up your PV input voltage high enough for your MPPT controller to do any good. I'm surprised you are charging at all with your current setup.

 Small wind turbines may add somewhat to your charging scheme. You need a wind specific controller that you should get with your turbine. Locate it as high as possible and as far from any obstructions as you can. Don't attach any part of the structure to your living quarters unless you like incessant resonating sound to lull you to sleep. Oh keep in mind wind turbines aren't maintenance free.

Your MPPT controller will convert all the higher voltage to your batteries requirement while boosting the amperage. You will gain amperage as the controller does the conversion instead of losing the upper end of the voltage, and consequently amperage, as a PWM controller does. I'm sure the pros here can give a better detailed explanation of MPPT.  Search "MPPT" here for plenty of other threads on the subject.

A typical 12 volt, 100 watt solar panel is about 7 amps, x4 panels yields 28 amps.

The batteries will take all the current while in bulk charge mode. Once the controller goes into absorb it will hold the voltage at a steady level while the amperage tapers down, As the batteries approach being fully charge the amperage accepted will decrease. Any additional amperage potential can be used by whatever loads you may be running. These are what's called opportunity loads. You can take advantage of this scenario by running certain loads in the afternoon when your batteries are near full or are in float mode (totally full).


 If you decide you need more panels you are going to need a larger capacity controller, or another separate controller. You need to add panels two at a time if you are going to add the same panels. 600 watts will likely push beyond your controllers amperage limit, it's close and being you really rarely get nameplate output you may be fine. Some MPPT controllers will simply limit any input power and charge at their maximum rated amperage. I'm not sure about the Renogy controllers as they are on the lower end of the MPPT charge controller world. If you do go with 3 strings of panels into your one controller you will need to fuse each string. A fused combiner box is the best way to do this.


I hope this makes sense to you. My first cup of coffee hasn't quite kicked in yet.