What is Maximum Power Point Tracking (MPPT)
Attachments: Up to 8 attachments including images can be used with a maximum of A vehicle alternator has its own voltage control mechanism, making it impossible for the mppt to work properly.
I experimented with various vehicle alternators some time ago, to use them as a generator for my MPPT hydro power installation. A vehicle alternator is separately excited, so the voltage control mechanism increases and decreases the excitation voltage to match the constant output voltage needed in your vehicle and to counteract to the changing speeds of the alternator.
To get rid of the voltage controI mechanism, I tried to connect the rectified output directly to the excitation coil. The result was that the alternator was going to self excitation and producing maximum output voltage possible, because of the rest magnetism in the main coil. But I have to say that if this works or not, depends on, if your alternator has enough rest magnetism in the main coil to build a electric field.
If not, you will have to apply a short pulse of dc current to the excitation coil to start self excitation. When you use a second! But I do not think that this would be a reasonable solution, I just wanted to add it, since I absolutely don't like guys telling me there is no way to do something.
Is it an option to use an Orian tr dc-dc converter. Connect the converter to alternator, output on the converter will feed supply to Mppt. I just need to switch between solar or alternator when needed. Markus We are using "48V" alternators and rectifiers that result in a flat 58vDC output. We need to bring that into a CANbus controlled Lithium battery environment.
There are few choices. The solar controllers become slave control under the GX with CANbus and so I can "control" the charging of the batteries. Your thoughts? My experience is that the source must deliver more amperage then the mppt input requirements for it's maximum output.
I was testing my setup with an external supply and it overloaded the supply unless I used the app to turn down the mppt charge rate. I did something very similar to this and it works well. I used this DCDC converter:. I used four units in parallel which required using balancing resisters and diodes to make the converters work together. I charge my 24V camper system from the 12V tow vehicle. When there is pv power your battery will get charged, when you drive, the dc-dc converter will load your battery.
Are 50vdc solar panels wasted on a 12vdc system? PV voltage spike on quick load changes in the system 2 Answers.Log in. This MPPT solar controller has light control and time control. You can manage the DC output of the solar controller in these two ways. Light control refers to when the night comes, the DC output is automatically turned on.
The main principle is that the controller will detect the voltage of the solar panel and automatically turn on the DC output when the voltage is below a certain value. Time control refers to time control. The DC output is controlled by setting the time. This time is consistent with the local time. Because there is a clock in the MPPT controller, this function is liked by many customers. Read more.
It only takes a minute to sign up. I am going to use the perturb and observe algorithm in tracking the maximum power point of the solar panel. Now I am thinking of what converter topology to use: buck, boost, buck-boost, etc. What do you suggest I use?
I recommend that you use either buck or boost with a battery that is always below or always above panel voltage respectively. This is because buck-boost converters that swap from one to other mode usually have a low efficiency range in the changeover area and converters that buck-boost by inverting, tend to be lower efficiency as all delivered energy is stored in magnetics and converted.
If you have a choice of battery voltage I'd lean towards a buck converter as these tend to be more efficient than boost converters. MPPT still makes sense in situations where absolute panel size or fitted weight is constrained by non financial aspects.
There's a lot of examples and literature out there for boost converters. Also, if you go discontinuous boost converter, you can remove the current sensors and the whole control system becomes far simpler to run with an Arduino. I made one with a chipkit, full details with code are in our writeup, here and we also did a video to explain the principles sounds like you won't need this explanation thoughon youtube.
Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. Ask Question. Asked 7 years, 6 months ago. Active 5 years, 9 months ago. Viewed 11k times. This sounds like an unusual application, and you should probably explain more about what you're trying to accomplish.
Normally, this type of converter is used in order to allow the solar panel voltage to "float" to whatever voltage yields maximum power, while delivering a variable current at a fixed voltage to a load such as a battery charger. The selection of converter topology is based on whether the output voltage is always less than, always greater than, or falls in the middle of the useful range of voltages from the panel.
I'm thinking of using a battery as the load. Can you explain more what you mean by "floating" the voltage to the voltage at max power? I'm quite new to electronics so all of this is a bit confusing for me. Active Oldest Votes. Thanks for the suggestion.
In the 2nd part of my answer I was suggesting that MPPT costs more than providing more solar panels to achieve the same result so it is only justified where more area of panel is a significant disdvantage - either due to available mounting area, or wind loading or whatever. Where MPPT is not used I was suggesting that the panel voltage at max power be optimised to suit battery voltage. While allowance MAY be made for low light, the 18V is higher than strictly sensible.
Using a 16V panel would probably produce better efficiency overall.Furthermore, the power optimizers monitor the performance of each module and communicate performance data to the SolarEdge monitoring platform for enhanced, cost-effective module-level maintenance.
The MPPT per module allows for flexible installation design with multiple orientations, tilts and module types in the same string. When working with SolarEdge inverters, the power optimizers automatically maintain a fixed string voltage, allowing installers even greater flexibility with longer strings and strings of different lengths in order to design optimal PV systems.
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Preferred Partner Program. Want to Go Solar? Run Your Car on Sunshine. Find an Installer. Smart Modules. Metering and Sensors. Media Press Releases Events Awards. Close mobile menu. Power Optimizer. How to Ground to Different Racking Types. Related documents.I had an idea to use a small 12 V solar charge controller because they are cheap and readily available between the 24 V source in this case a 24 V battery bank and a 12 V lead acid battery.
Would that work?
Or would its just burn out the charge controller? Tagged: MPPT batteries dc charger. October 2. Worked flawlessly! October 3. October 4. I also have been using a morningstar fed from a 48v bank to keep a 12v battery floating and running a bunch of 12v loads, it works great. October 5. Thanks for the feedback. Brock and firerescue, I'll definitely give it a try then.
Johann, that is the configuration I currently use, but I'm trying to find a way to stick to purely DC to minimize losses. October 6. Any idea how the MPPT does efficiency wise when used in this way? October edited October 7. October edited October 8. Not at all efficient.
The further the voltage of the PV is from the battery voltage, the more loss. October 9. Good point don't do it. October Adding to Mike, anyone who does this must take care to breaker or fuse the mppt input wiring to the battery correctly as well as the mppt output wiring the lower voltage battery. This application is alot diiferent than hooking solar panels to the mppt. An mppt internal failure could start a fire.Power Management Minimize menu.
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How to manage MPPT solar controller DC output function
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To put it simply, they convert a higher voltage DC output from solar panels and a few wind generators down to the lower voltage needed to charge batteries. These are sometimes called "power point trackers" for short - not to be confused with PANEL trackers, which are a solar panel mount that follows, or tracks, the sun.
Check out our MPPT charge controllers. Solar cells are neat things. Unfortunately, they are not very smart. Neither are batteries - in fact, batteries are downright stupid. Most PV panels are built to put out a nominal 12 volts. The catch is "nominal". In actual fact, almost all "volt" solar panels are designed to put out from 16 to 18 volts. The problem is that a nominal volt battery is pretty close to an actual 12 volts - Under charge, most batteries want from around OK, so now we have this neat watt solar panel.
Catch 1 is that it is rated at watts at a particular voltage and current. The Kyocera KC is rated at 7. So what happens when you hook up this watt panel to your battery through a regular charge controller? Your panel puts out 7. Your battery is sitting at 12 volts under charge: 7.
How to manage MPPT solar controller DC output function
You lost over 41 watts - but you paid for That 41 watts are not going anywhere, it just is not being produced because there is a poor match between the panel and the battery.
With a very low battery, say You lost about 48 watts. It's not actually missing, it's just not usable by the charge controller.
One solution you might think of - why not just make panels so that they put out 14 volts or so to match the battery? Catch 22a is that the panel is rated at watts at full sunlight at a particular temperature STC - or standard test conditions. If the temperature of the solar panel is high, you don't get At the temperatures seen in many hot climate areas, you might get under 16 volts.
If you started with a volt panel like some of the so-called "self-regulating" panelsyou are in trouble, as you won't have enough voltage to put a charge into the battery. Solar panels have to have enough leeway built in to perform under the worst of conditions. The panel will just sit there looking dumb, and your batteries will get even stupider than usual. Panel tracking - this is where the panels are on a mount that follows the sun.
The most common are the Zomeworks. These optimize output by following the sun across the sky for maximum sunlight.