The GridFree inverters for the energy solutions
The 1000W and 2000W GridFree Smart inverters for energy self-generation.
Can I use two inverters with limiter with one battery pack?
Yes you can use more inverters at one battery pack by following connection. You can use 3 inverters on each phase too.
1 - electricity meter
2 - inverter with limit 1
3 - inverter with limit 2
4 - Battery
5 - place of consumption
6 - Limit Current Sensors
FAQ: What is a GridFree Solution
Question: What is the difference between the GridFree and the Grid-tied installation?
There are basically just two possible types of installations: Grid-tied and Off-Grid.
The grid-tied installation means the inverters work in synchronization with the AC grid and supply the energy to the Grid. The off-grid installation means the inverters product energy for the consuming equipment (appliances), they do not connect with the grid, or even must not be connected with the grid (by the technical requirements). The off-grid installation usually requires batteries to provide a continuous energy supply.
The GridFree is one type of a Grid-tied installation. The only difference between the commercial grid-tied installations (typically requiring an energy producer license) is that the GridFree installation does not send any surplus energy to the outside grid. In a proper GridFree installation all energy is consumed locally. The GridFree installation is in fact reducing the consumption from the grid by providing self-produced energy....more >>
FAQ: Adding the solar microinverter to the central inverter
Question: I have a permit to connect a 2 kWp solar installation. At this time I have a 1.5 kW inverter. I consider connecting another set of two 250Wp panels with microinverters to increase from 1.5kW to full power of 2 kW. Are the microinverters from GWL compatible with my solar inverter? Will they work together?
Answer: Yes, these inverters will work together on the 230V AC line. They all work on the same AC line and they follow the same international standards (in EU defined by EN50438 norm). So it is possible and very easy to “mix” various inverters on the AC line together.
Your idea is very clever and we recommend to all customers: With microinverters it is possible to add additional solar panel or panels to the existing installation (with other inverters) to get the full maximal power peak that is permitted by your grid license. As there is no change of your original installation, there is no need to update your license or permit from the Grid operator. This expansion of existing solar installations is also called solar retrofitting.
Understanding the EN 50438 for MicroInverter Operation
The EN 50438 gives the specifications of the Grid parameters. The microiverters are required to operate within the limits of this EN standard.
The parameters mean if the grid frequency is above 52 Hz or bellow 47.5 Hz, the microinverter has to stop operation in max 0.5 s.
If the voltage is above 264.5 V or bellow 195.5 V, the microinverter has to stop operation in max 0.2 s.
In case the voltage is above 253 V and bellow 264.5 V for longer that 600 seconds (10 minutes), the microinverter has to stop working as well. (This is required by EN 50160.)
In case the there is no grid (voltage is 0 V or bellow 195.5 V), the microinverter must disconnect in 0.2 seconds. If fact the disconnection time of the microinverter is about 50 ms (0,050 seconds, max 5 half waves of the sine curve.)
Moreover Germany (and some other countries) give a regulation that says that in case that frequency is above 50.2 Hz it is necessary to reduce the power (VDE4105). However this standard applies only for inverters that feed energy to the public grid. It is not applicable for the self-consumption installations.
Small solar panel with the solar micro-inverter
Question: I have a 185Wp panel. How will this panel work with a 250Wp microinverter?
Answer: The panel will work with the microinverter only if the voltage of the panel matches the operating voltage of the inverter. If the voltage matches, the inverter will produce the energy in the amount provided by the panel. See the example:
A) The microinverter has the operating voltage (MPPT range) between 24V and 55V. The 185Wp panel has the open voltage 36V and the max point voltage 30V. This type of panel will work with the microinverter. When at the full sun shine the panel will provide some 180 watts of energy and the microinverter will convert this energy to the AC output.
B) The microinverter has the operating voltage (MPPT range) between 24V and 55V. The 185Wp panel has the open voltage 18V and the max point voltage 14V. This type of panel will NOT work with the microinverter. The voltage of the panel is out of the range of the microinverter. Tip: you can connect two identical panels in series to increase the voltage – this support article with ideas of regulating the solar power by means of more small size panels used for one micro-inverter.
FAQ: Multiple micro-inverter installation
I have a microinverter installation with products from ABC Company. I have 2kW installation (8x250Wp). Now I wish to increase my installation with more inverters. My questions:
1) The products from ABC Company use a PLC communication to work with the gateway. Is the YC-500 and YC-500 gateway compatible with the ABC products and the PLC communication?
No, sorry. There is no compatibility of the products from different manufacturers. Each product has its own protocol and the products cannot be managed together.
2) Can the ABC products and the YC-500 inverters work on the same AC line (same phase)?
Yes, there are many installations where inverters (and microinverters) from various manufacturers work together in the AC 230V grid line (phase). Since the grid requirements are the same for all products, observing these requirements makes all product compatible on the AC line – for the energy production. (Not for the communication protocols)....more >>
Micro-Inverter – Combined Energy at Your Hand
Combining the existing water/wind power plants with additional energy supply from solar panels.
Smart energy handling with solar micro-inverters, especially for small water power plants: if there is a lot of sunshine, usually there is less water-fall and water-flow. The energy from the sun can be used during sunshine days and the water power generation can be used less or preserved for use at night or during cloudy days.
Micro-Inverter – Solar Retrofitting
Adding additional permanent or temporal modules to increase the yield of the solar installations. Increase the yield from your existing solar installation by simply adding one or more extra solar panels with microinverters.
The YC500 - dual microinveter
The YC500 is a dual micro-inverter with two MPPT units for higher yield of solar energy. See the comparison of the real yield using two different configurations.
One configuration is with 2x 260Wp panels, the other is with 2x 300Wp panels.
When using the 300Wp panels, the energy yield is significantly higher.