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With the emergence of wind & solar power and other new energy sources, the development of intelligent grid technology as well, large -scale energy storage station is becoming to meet peak power allocation. HECO 12V &24V standard lithium ion battery with excellent safety,high energy density, cell voltage detection, which could be connected with BMS to monitor the matter as well, which is most suitable for energy storage battery. For many applications, our battery systems result in significantly lower total cost of ownership over lead acid because lighter-weight, longer-life batteries means fewer replacements, reduced maintenance and service costs, less shipping and material handling costs, and lower total inventory carrying costs. At this point, you know what your project array power will be or you have already acquired your panels (if not, read Lesson 1: How to Size Your Array first). Where to buy cheap Balance-of-System (BOS) components (cables, connectors, etc.) for your solar array. Before we start spending money, it is important to make a general list of items you need for your array.
Keeping the a€?System Configurationa€™ theory in mind, make a nice drawing on a piece of paper where you outline your system. The charge controller is the brain of the system that regulates voltage levels for your array, battery and load. In the first lesson, you learned how to size your solar array by using PVWatts to find the average daily yield in each month. Battery capacity is often denoted as a€?Aha€™ or a€?mAha€™, which doesna€™t say anything about its storage capabilities without the voltage of the battery. It is obvious that you should at least get a capacity that exceeds the battery capacity of the electrical device you plan to charge with your solar charger. As per the type of battery to get, we would recommend buying either sealed lead-acid batteries or li-ion. A Maximum Power Point Tracker (MPPT) is a special type of charge controller that optimizes the energy yield of your array by controlling the panela€™s operating voltage. As you already know, the PV panels produce a current at a certain voltage that is equal to the voltage of the load attached to the array.
How a Maximum Power Point Tracker works: calculating the resulting power from several points along the operating line. The MPPT arbitrarily sets the voltage when the system is connected and then it tries out different operating points until it finds the MPP. This table displays small (<500 W) Maximum Power Point Trackers (MPPT) that are available on the market now.
We will post a comparative review of the Morningstar compared to the Wellsee and maybe later the Juta Solar MPPT as well. Besides the main electrical components for your solar battery charger, you need to have cables, connectors, fuse boxes etc. This table shows the complete shopping list of components (with prices) that were used in the example array. The Morningstar MPPT charge controller (with Meterbus Adapter) we bought was quite expensive (one-third of the total). Under 'Miscellaneous' you find items that you might already have: some screws, cable holders and double sided tape, all used for mounting the components to the plywood board. Lives his life vicariously through his own self.Any statement made by me are strictly my own opinion.
MtnDon wrote:It is, IMO, probably best to think in terms of the watt-hours available, not amp-hours. As for to parallel or not to parallel, in the realm of RV's, typical off grid cabins and homes, I maintain that parallel is best avoided.

HECO is developing he environmental-protection  lithium-ion energy storage battery with the lightest, fast charge and discharge, cycle file more than than 10,000 times to meet the future demand of energy storage stations and new energy vehicle charging stations. No toxic, or polluting material(such as lead, cadmium, mercury) is contained in lithium battery, which is a kind of green battery. Excellent procedure quality tracking control system ensure HECO battery’s excellent performance and good consistency.
HECO strives to become an advanced enterprise in the energy storage battery industry field. Make a schematic drawing of your system, showing voltages and maximum currents youa€™re expecting on your wires and electrical components. The voltages at the charge controller are 47 V (open circuit panels), 12 V (battery) and 12 V (loads). Of course, this electricity has to be stored somewhere unless your load is directly connected to the solar panels. It makes sense to oversize it with a factor 2 or 3, so that you are prepared for possible battery performance loss and you can store more juice in those sunny summer days. Other battery types like NiMH and NiCd require special charging algorithms that are not supported in most charge controllers.
This operating voltage is very important: if it is not set right, you can miss out on the full potential of your panels. The total output of the cell is therefore 1.51 Watts, which is equal to the area of the yellow rectangle in the graph.
The device simply multiplies the current and voltage for a point and then compares it to the last operating point.
As we mentioned before, you can also get a conventional PWM charge controller that will regulate only the battery and load's voltage.
Most panels nowadays come with MC4 connectors, but look at the manual to find out what type it is and figure out how many you need. It is impossible to get shocked when inserting the fuses, because they only connect after you close the lid. It doesn't seem to affect the battery warranty when we do, and it also mitigates the scenario where a single cell failure in a battery drops the load. I base that on my own observations and to a high degree what I have learned from others with decades of alternate energy experience. Heco’s research and development team include electronic engineer, mechanical engineer, structure engineer, whom could offer our clients one stop solutions including BMS, charger, battery pack structure, and overall applications. Each component has its own range of voltages and currents in which it can operate, and you should therefore first check if all components are compatible with all the others. Many solar panel retailers sell their products with huge profit-margins, and it is beneficial to spend a fair amount of time browsing the web for good-quality panels available at wholesale prices. Depending on your configuration and component specs, you can increase your yield up to 30% compared to a conventional charge controller. In our case, we wanted to have this more expensive controller because of the increased yield and also for the possibility to send data to our computer.
Make sure to buy the right size fuses for your fuse box, because there are different kinds. The jumpers are little metal plates that connect multiple sockets together and allow for parallel-coupling.
In fact, because of the coup de fouet (whiplash) effect, paralleling batteries is often the only way to serve high current loads.

One fellow, Dave with 22 years and the other Tom with over 30 years experience in off grid, wind and solar power.
Since that is relatively high compared to our 12 V battery bank, we decided to parallel-couple the panels. If you need to run some 5 Watt LEDs for 10 hours a day, you need (!at least!) 50 Wh of capacity in your battery. Yes, you got it, the MPP is the Maximum Power Point: the rectangle under the curve is at its maximum!
All these extra kWh come with a cost though: the MPPT version of a $50 charge controller can cost you $200. In our case (135 W), we decided to buy one so that we can get experience working with the device.
The Morningstar feels tough, it is a little heavier and not assembled in a simple plastic casing, held together by four screws. We decided to get some cigarette lighter sockets as loads, since these are universal connectors for electric components used in cars. The circuit maintains one’s position current the few , for feed give the circuit randoms voltage battery. Lets not judge MPPTs by their looks and feels though, we should test and compare their performance! When you have targeted your MPPT, download the manual and thoroughly read it before you buy other components. No mixing of various capacities, etc.) It is, IMO, probably best to think in terms of the watt-hours available, not amp-hours.
However I am used to working with assorted voltages, DC and AC and watts and watt-hours is how I wrap my brain around the power issue.I was waiting to see if someone would question that statement. With some cheap cigarette lighter converters you can get for a car, we built a very universal load bank, where people can plug-in their iPhones and Blackberries for a free green charge! With our 135 Watt array, we can charge this battery in a day with approximately 5 full sun-hours, taken into account losses from the wiring, panels and the battery. If the system voltage is 12, then we need to assemble something like two 6 volt batteries in series; something like golf cart batteries for example.
That want power supply give the circuit all the time , thus should choose battery at have many capacity such as , 40Ah sizes etc. This is a great pick for stationary applications, where you dona€™t care about the batterya€™s weight. Two examples: the MPPT we used only works with lead-acid batteries and the Wellsee MPPT only fits smaller cable sizes. Two out of three were not working at all, and the other had a malfunctioning USB charging port. There are times it is not possible; frequently because of the higher costs of some of the specialized high capacity low voltage batteries or cells. They are very light and easy to handle, but keep in mind that not all charge controllers support this technology (like our Morningstar Sunsaver MPPT).

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