ac_coupling:start
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ac_coupling:start [2019-01-22 10:15] – external edit 127.0.0.1 | ac_coupling:start [2020-05-29 16:54] – [2.1 Rule definition] guy_stewart | ||
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===== 1. Introduction to the AC-Coupling concept ===== | ===== 1. Introduction to the AC-Coupling concept ===== | ||
- | Already familiar with the concepts of AC-coupling and regulating PV inverter output power by frequency shifting? Skip to [[: | + | Already familiar with the concepts of AC-coupling and regulating PV inverter output power by frequency shifting? Skip to the requirements and limitations: |
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+ | - [[: | ||
+ | - [[: | ||
+ | - [[: | ||
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==== 1.1 What is AC-coupling? | ==== 1.1 What is AC-coupling? | ||
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+ | {{: | ||
In an AC-coupled system, a grid-tied PV inverter is connected to the output of a Multi, Inverter or Quattro. PV power is first used to power the loads, then to charge the battery, and any excess PV power can be fed back to the grid. | In an AC-coupled system, a grid-tied PV inverter is connected to the output of a Multi, Inverter or Quattro. PV power is first used to power the loads, then to charge the battery, and any excess PV power can be fed back to the grid. | ||
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* Systems with only a grid-tied PV inverter will fail when there is a grid black-out. A micro-grid system will continue to operate, and even keep using solar power. | * Systems with only a grid-tied PV inverter will fail when there is a grid black-out. A micro-grid system will continue to operate, and even keep using solar power. | ||
* It is also possible to run a AC-coupled micro-grid on a generator | * It is also possible to run a AC-coupled micro-grid on a generator | ||
- | * Most brands of PV inverters can be used for these systems, they need to be setup to support frequency shifting, often called the island-mode or micro-grid mode. For Fronius settings, see [[ac_coupling: | + | * Most brands of PV inverters can be used for these systems, they need to be setup to support frequency shifting, often called the island-mode or micro-grid mode. For SolarEdge settings, see [[venus-os: |
* If power will be fed back into the grid an anti-islanding device may have to be added to the system, depending on local regulations. | * If power will be fed back into the grid an anti-islanding device may have to be added to the system, depending on local regulations. | ||
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- | ===== 2. The 1.0 rule: Max PV power must be equal or less than the VA rating of the Multi ===== | + | ===== 2. The Factor |
+ | **The max PV power must be equal or less than the VA rating of the inverter/ | ||
==== 2.1 Rule definition ==== | ==== 2.1 Rule definition ==== | ||
- | In both grid-connected and off-grid systems with PV inverters installed on the output of a Multi, Inverter or Quattro, there is a maximum of PV power that can be installed. This limit is called the __factor 1.0 rule__: 3.000 VA Multi = 3.000 Wp installed solar power. So for a 8.000 VA Quattro the maximum is 8.000 Wp, for two paralleled 8000 VA Quattros the maximum is 16.000 Wp, etc. | + | In both grid-connected and off-grid systems with PV inverters installed on the output of a Multi, Inverter or Quattro, there is a maximum of PV power that can be installed. This limit is called the __factor 1.0 rule__: 3.000 VA Multi >= 3.000 Wp installed solar power. So for a 8.000 VA Quattro the maximum is 8.000 Wp, for two paralleled 8000 VA Quattros the maximum is 16.000 Wp, etc. |
==== 2.2 Example and background ==== | ==== 2.2 Example and background ==== | ||
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* 400 Ah accubank 12 Vdc | * 400 Ah accubank 12 Vdc | ||
- | ==== 4 Software configuration ==== | + | ===== 4 Requirement of adding DC-Coupling - MPPT Solar Chargers ===== |
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+ | Not required for Energy Storage Systems in Germany or other reliable grid situations. | ||
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+ | Required for offgrid systems as well as backup systems that need to overcome extended grid failures. | ||
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+ | Reason: recover from deadlock situation of AC-Coupling only situation. | ||
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+ | ===== 5 Software configuration | ||
Multis and Quattros with factory settings will not shift the AC output frequency to regulate charge current. When setting up an AC Coupled system, install either the [[ess: | Multis and Quattros with factory settings will not shift the AC output frequency to regulate charge current. When setting up an AC Coupled system, install either the [[ess: | ||
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- Hub-4 Assistant in combination with the PV Inverter support Assistant | - Hub-4 Assistant in combination with the PV Inverter support Assistant | ||
- Use the Inverter period time settings on the Virtual switch tab. | - Use the Inverter period time settings on the Virtual switch tab. | ||
+ | |||
+ | ===== Monitoring ===== | ||
+ | |||
+ | See [[ccgx: | ||
===== DISQUS ===== | ===== DISQUS ===== | ||
~~DISQUS~~ | ~~DISQUS~~ | ||
ac_coupling/start.txt · Last modified: 2022-04-12 06:47 by bob