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--- ac_coupling:start [2019-01-22 10:15] – external edit 127.0.0.1
+++ ac_coupling:start [2019-02-16 10:47] – [1. Introduction to the AC-Coupling concept] mvader
@@ Line 2: / Line 2: @@
 ===== 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 [[:ac_coupling:start#the_10_rulemax_pv_power_must_be_equal_or_less_than_the_va_rating_of_the_multi|the factor 1.0 rule]].
+Already familiar with the concepts of AC-coupling and regulating PV inverter output power by frequency shifting? Skip to the requirements and limitations:
+  - [[:ac_coupling:start#the_factor_10_rule|Factor 1.0 rule chapter]]
+  - [[:ac_coupling:start#minimum_battery_capacity|Minimum battery capacity chapter]]
+  - [[:ac_coupling:start#requirement_of_adding_dc-coupling_-_mppt_solar_chargers|Requirement of adding DC-Coupling]] (MPPT Solar Chargers)
 ==== 1.1 What is AC-coupling? ====
@@ Line 26: / Line 32: @@
-===== 2. The 1.0 rule: Max PV power must be equal or less than the VA rating of the Multi =====
+===== 2. The Factor 1.0 rule =====
+**The max PV power must be equal or less than the VA rating of the inverter/charger**
 ==== 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.
@@ Line 73: / Line 80: @@
   * 400 Ah accubank 12 Vdc
-==== 4 Software configuration ====
+===== 4 Requirement of adding DC-Coupling - MPPT Solar Chargers =====
+Not required for Energy Storage Systems in Germany or other reliable grid situations.
+Required for offgrid systems as well as backup systems that need to overcome extended grid failures.
+Reason: recover from deadlock situation of AC-Coupling only situation.
+===== 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:start|ESS Assistant]] (for grid-connected systems) or the [[:assistants:pv-inverter-support]] (for off-grid systems).