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--- ac_coupling:start [2020-06-18 16:13] – [2.4 Should you look at the total PV array, or the PV inverter rating?] marmour
+++ ac_coupling:start [2021-01-19 11:10] – [4 Requirement of adding DC-Coupling - MPPT Solar Chargers] guystewart
@@ Line 71: / Line 71: @@
 ==== 3.1 Lead batteries ====
-kWp installed PV power requires approximately 5kWh of battery:
+kWp installed PV power requires approximately 5kWh of lead acid battery:
-  * 100 Ah accubank 48 Vdc
+  * 100 Ah at 48 Vdc
-  * 200 Ah accubank 24 Vdc
+  * 200 Ah at 24 Vdc
-  * 400 Ah accubank 12 Vdc
+  * 400 Ah at 12 Vdc
+Each additional 1 kWp of AC PV will require an additional proportional 5 kWh increase in lead acid battery storage.
 ==== 3.2 Lithium batteries ====
-,5 kWp installed PV power requires:
+,5 kWp installed AC PV power requires 4.8 kWh of battery storage:
-  * 100 Ah accubank 48 Vdc
+  * 100 Ah at 48 Vdc
-  * 200 Ah accubank 24 Vdc
+  * 200 Ah at 24 Vdc
-  * 400 Ah accubank 12 Vdc
+  * 400 Ah at 12 Vdc
+Each additional 1.5 kWp of AC PV will require an additional proportional 4.8 kWh increase in battery storage.
 ===== 4 Requirement of adding DC-Coupling - MPPT Solar Chargers =====
@@ Line 89: / Line 91: @@
 Reason: recover from deadlock situation of AC-Coupling only situation.
+There is no Factor 1.0 limit that applies for DC coupled PV through a Victron MPPT. Nor is there a specific minimum amount of battery storage capacity, though please follow battery manufacture specifications for maximum charge rates. A rule of thumb is C10 (10% of Ah capacity in A) for lead acid batteries, and C2 (50% of Ah capacity in A) for lithium batteries.
 ===== 5 Software configuration =====