ac_coupling:start

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ac_coupling:start [2020-05-29 16:54] guy_stewart [2.1 Rule definition] |
ac_coupling:start [2021-04-12 03:03] (current) guystewart [Monitoring] |
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==== 2.3 Charge current limit ==== | ==== 2.3 Charge current limit ==== | ||

- | Another question frequently asked is how can this factor be 1.0? Since the charger inside a 3000 VA Multi is not 3000 VA but closer to 2000 VA? The explanation lies in the fact that it will regulate . In other words: when there is too much power coming in, causing the charge current to exceed the limit, it will increase the output frequency again and will keep regulating the AC output frequency to charge with the limit. | + | Another question frequently asked is how can this factor be 1.0? Since the charger inside a 3000 VA Multi is not 3000 VA but closer to 2000 VA? The explanation lies in the fact that it will regulate. In other words: when there is too much power coming in, causing the charge current to exceed the limit, it will increase the output frequency again and will keep regulating the AC output frequency to charge with the limit. |

An example, a 3000 VA Multi, with 3000 W of solar power coming out of a PV inverter: | An example, a 3000 VA Multi, with 3000 W of solar power coming out of a PV inverter: | ||

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==== 2.4 Should you look at the total PV array, or the PV inverter rating? ==== | ==== 2.4 Should you look at the total PV array, or the PV inverter rating? ==== | ||

- | The mentioned 3000 Wp and 8000 Wp is the Watt-peak which can be expected from the solar system. So for a oversized PV array, where the total Watt-peak installed PV panels exceeds the power of the PV Inverter, you take the Wp from the inverter. For example 7000 Wp of solar panels installed, with an 6000 Watt PV grid inverter, the figure to be used in the calculations is 6000 Wp. | + | The mentioned 3000 Wp and 8000 Wp is the Watt-peak which can be expected from the solar system. So for an oversized PV array, where the total Watt-peak installed PV panels exceeds the power of the PV Inverter, you take the Wp from the inverter. For example 7000 Wp of solar panels installed, with an 6000 Watt PV grid inverter, the figure to be used in the calculations is 6000 Wp. |

And for an undersized PV array, where the total Wp of installed PV panels is less than the installed PV grid inverter, you use the Wp from the PV panels in your calculation. | And for an undersized PV array, where the total Wp of installed PV panels is less than the installed PV grid inverter, you use the Wp from the PV panels in your calculation. | ||

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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 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 ==== | ==== 3.2 Lithium batteries ==== | ||

- | 1,5 kWp installed PV power requires: | + | 1,5 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 ===== | ===== 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 1.5 in the GX manual]]. | + | See [[https://|Connecing a PV inverter section of the GX manual]]. |

===== DISQUS ===== | ===== DISQUS ===== | ||

~~DISQUS~~ | ~~DISQUS~~ | ||

ac_coupling/start.1590764043.txt.gz · Last modified: 2020-05-29 16:54 by guy_stewart