FAQ: What is the max solar power for the 10Amp MPPT controller?
Answer: The the power rating for the MPPT controllers is given by the voltage [V] and the current [A]. The max current [A] of the MPPT controller is fixed and cannot be over reached.
This means the voltage of the batter will determine the power rating. With the “half of the voltage” (12V versus 24V) you get only “half of the maximal power”.
For example: for the MPPT Solar Regulator 12/24 V, Tracer 10 A, Input 100V (TR-1210RN) the maximal power is about 240W at 24V:
12V 10A ——> nominal 120W (up to 140Wp of max panel rating)
24V 10A ——> nominal 240W (up to 260Wp of max panel rating)
In order to have a 240Wp (250Wp) power rating of the panel, you need to use the 24V battery. With the 12V battery, the max power is only 120W (up to 140Wp).
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FAQ: 3-phase connection with the Micro Inverters
Question: I intend to make 3-phase connection with the MicroInverters to the grid. What do you suggest?
Answer: There are three options with the MicroInverter installation on the 3 phase system:
1) Balanced installation (mainly for Grid-Tied systems)
With the balanced installation the number of inverters per each phase is the same: in the 24 pcs installation, you will install 8 inverters to each phase (3x8 pcs).
See details here: http://gwl-power.tumblr.com/post/36901093005/micro-inverter-an-easy-way-with-3-phase
2) Demand-based installation (mainly for Grid-Tied self consumption systems)
With the demand-based installation, the number of inverters per phase is fixed according to the power demands on each phase. For example if phase L1 has 50% of long term average power demands, L2 has 30% and L3 has 20%, the number of inverters will match this average power demand: 12 inverters in L1, 7 inverters in L2 and 5 inverters in L3.
3) Dynamic installation (mainly for GridFree full self consumption systems)
With the dynamic installation, the number of inverters per phase is not fixed at all. The individual inverters connect in steps according to the actual demand on each phase. For example if the demand on the phase L1 is 2300Watts, 10 inverters will be connected to L1.
If the demand increases more will connect to provide the extra power. This way the energy form the inverters is used in the most ideal way to match the consumption.
See additional details here: http://gwl-power.tumblr.com/post/36900205193/micro-inverter-allows-simple-energy-management
FAQ: energy loss on solar cables for parallel panel connection
Question: I want to connect solar panels in parallel. What should I keep in mind?
Answer: For a typical 240 WP panel, the MPP voltage is 30V and the current is 8 Amps. If you connect the panels in parallel, the voltage will be the same (30V) and the current will increase. For two panels you get 16 Amps, for 3 panels you get 24 Amps.
However it is important to keep in mind that the loss of energy is growing with the square of current: W = R * I ^2. If you increase the current two-times, the loss of energy will increase 4 times (2^2 = 2x2 = 4) , if you increase the current 3 times, the loss of energy will increase 9 times (3^2 = 3x3 = 9).
For example if you have a cabling with the resistance of 0.1Ohm, with the flowing current of 8 Amps , you will loose some 6 watts of energy on the cabling. With 16Amps you will loose some 26 Watts and with 24 Amps you will loose some 58 Watts of energy.
That is why for the parallel connection, it is very important to use proper copper cables with thick diameters to reduce the energy loss.
For grid-connected installations it is advantage to place the MicroInverters right to the panels. This helps to avoid the energy loss.
Six panels, six micro-inverters - a simple household installation
Making your solar installation is easy. See another project based on the solar panels with the microinverters.
Another solar balcony installation!
Let sun come into your home as well. Make it your goal to install solar panels at your home.
Installation of solar panels onto an iron roof
The photo shows the way to install solar panels onto an iron roof. Special type of fastener is used. These allow making holes that will stay waterproof.
Solar in Poland in 2014
For the year 2014 we hope Poland will become a hot market for solar installations.
Please see the solar map of Poland. This shows the locations where it makes sense to install solar panels.
We will be happy to support efforts of all customers for the Poland market in 2014 and beyond.
As the costs of fuel and work-labor (drivers wages) in Poland are much lower than in Czech. It may be better for Polish customers to arrange for their own drivers to come to GWL warehouse in Prague. This will help to save more money.
We welcome inquiries from customers in Poland.
The solar power at various solar conditions
The specification of the solar panel gives the estimated yield of energy (power) at various conditions. The power is the mutliple of the voltage (ideally at the MPPT point) and the current. The lower the sun-shine, the weaker the panel - this means the lower the current the panel will be able to supply.
A photo of the micro-inverter installation
The photo shows an installation of 7 microinverters that are located above the solar panels. In this installation the microinverters are not located under the solar panels. This separate position of the inverters allows to have a better cooling (by free wind flow) and it allows an easier access to the inverters in case of any need for maintanance.
Ideas for solar panel installations
Simple ideas that show possible locations for mounting solar panels at buildings.
Solar panel orientation
Check the output of the solar panels based on the orientation. The solar panels yield most when directly facing the sun. (In central Europe - south direction - with angle between 30 deg to 60 deg)
Making Miracles by Email – Mission Impossible
A request by email: Please tell me how many panels and other equipment I need to power my house completely? (For everyday use - light, oven, water heating boiler, cooker, etc. My house is located in Latvia, Eastern Europe - so we haven’t so much sun as in Spain / Italy etc.). Please make me a complete offer (including shipping) with all necessary things, so that I can just put all things together to make independent and good working system for my house.
This is a nice request, but it is not possible to make a complete offer based just on one email.
Our suggestion for those who want to make a solar or energy system, is to start step by step. Perhaps just starting with one or few solar panels, and than making the system bigger and bigger. This way it is possible to learn the know-how and save money. Another option is to try to find a local installer with experience to help you. At GWL, we will be happy to offer consulting services to installers to give them the additional know-how about the solar and battery technology.
Please remember, we cannot offer advice over emails or phone just free-of charge. All basic information about the products is available on-line. For example we have 900+ articles at our GWL/Blog. It is important to study before asking the questions.
If you decide you need a technical support, you can request (order) the support on-line.
EVBoiler - the easy solution for reducing energy consumption from the Grid
In an example of a solar installation, 6 panels (290Wp) will generate an average 1400Wp of energy (at 80% rate) that is used for water heating using the EVBoiler. With 1200 hours of full sunshine per year, the total energy production is 1680 kWh. This means there is no need to take 1.68MWh from the grid!
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