ac_coupling:start
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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 [2022-04-12 06:47] (current) – [1.1 What is AC-coupling?] bob | ||
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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 SolarEdge settings, see [[venus-os: | + | * 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: |
+ | * To read out SMA inverters, see [[ccgx: | ||
* 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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==== 3.1 Lead batteries ==== | ==== 3.1 Lead batteries ==== | ||
- | 1 kWp installed PV power requires approximately 5kWh of battery: | + | 1 kWp installed PV power requires approximately 5kWh of lead acid battery: |
- | * 100 Ah accubank | + | * 100 Ah at 48 Vdc |
- | * 200 Ah accubank | + | * 200 Ah at 24 Vdc |
- | * 400 Ah accubank | + | * 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 ==== | ==== 3.2 Lithium batteries ==== | ||
- | 1,5 kWp installed PV power requires: | + | 1,5 kWp installed |
- | * 100 Ah accubank | + | * 100 Ah at 48 Vdc |
- | * 200 Ah accubank | + | * 200 Ah at 24 Vdc |
- | * 400 Ah accubank | + | * 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 ===== | ===== 4 Requirement of adding DC-Coupling - MPPT Solar Chargers ===== | ||
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Reason: recover from deadlock situation of AC-Coupling only situation. | 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 ===== | ===== 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: |
+ | |||
+ | The Inverter RS will automatically shift frequency without any additional configuration required when a surplus/ | ||
Other options, __all deprecated__, | Other options, __all deprecated__, | ||
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===== Monitoring ===== | ===== Monitoring ===== | ||
- | See [[ccgx:start|section | + | See [[https:// |
===== DISQUS ===== | ===== DISQUS ===== | ||
~~DISQUS~~ | ~~DISQUS~~ | ||
ac_coupling/start.1592489601.txt.gz · Last modified: 2020-06-18 16:13 by marmour