assistants:self_consumption_hub-1_policy-5
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| assistants:self_consumption_hub-1_policy-5 [2015-10-31 15:20] – [Hub-1 - Policy 'Connected to mains, no feedback'] mvader | assistants:self_consumption_hub-1_policy-5 [2019-01-22 10:16] (current) – external edit 127.0.0.1 | ||
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| - | ====== Hub-1 - Policy ' | + | ====== |
| - | This policy | + | For new installes, this policy |
| - | To keep the text short, ' | + | Use [[ess: |
| + | |||
| + | ===== Original text ===== | ||
| + | |||
| + | This policy is intended for backup systems, with DC-coupled solar installed. Use it to make use of excess solar power: as soon as the batteries are full, AC loads will be co-powered with solar power. Power stored in the batteries will only be used to power the loads during a grid failure. | ||
| + | |||
| + | To keep the text short, ' | ||
| ==== Installation & configuration ==== | ==== Installation & configuration ==== | ||
| - | * Safety: it is required to have either internal or external anti islanding detection. Internal detection is enabled a compliant grid code standard is selected, see Grid tab in [[http:// | + | * Safety: it is required to have either internal or external anti islanding detection. Internal detection is enabled |
| - | * [[http:// | + | * [[https:// |
| * the Assistant will reduce output power of the MPPT in case of an Li-Ion high cell signal/ | * the Assistant will reduce output power of the MPPT in case of an Li-Ion high cell signal/ | ||
| * the MPPT will not follow its own charge algorithm. The Assistant will actively control the output voltage of the MPPT instead. | * the MPPT will not follow its own charge algorithm. The Assistant will actively control the output voltage of the MPPT instead. | ||
| * there will never be a state mismatch (ie Multi in ‘absorption’ and MPPT in ‘float’) | * there will never be a state mismatch (ie Multi in ‘absorption’ and MPPT in ‘float’) | ||
| * When the VE.Bus to VE.Can interface cable is not used one must make sure that: | * When the VE.Bus to VE.Can interface cable is not used one must make sure that: | ||
| - | * the MPPT voltage during float for Li-Ion must be 13.6V (For Lead it must be anything > 13.5) | + | * the MPPT voltage during float for Li-Ion must be 13.6V (For Lead it must be anything > 13.5V) |
| * for optimal use of solar power make sure that the absorption time of the MPPT is exceeds the absorption time of the Multi. | * for optimal use of solar power make sure that the absorption time of the MPPT is exceeds the absorption time of the Multi. | ||
| - | * Lithium systems: as always, also connect the BMS to the MPPT solar chargers, to stop charging the batteries | + | * Lithium systems: |
| - | * Install a [[http:// | + | * Install a [[https:// |
| - | * Install a [[http:// | + | * Install a [[https:// |
| + | * The battery capacity, although displayed on the VEConfig settings summary screen in the assistant, is irrelevant when choosing this option. For this reason, the assistant will not ask for it. | ||
| ==== How it works ==== | ==== How it works ==== | ||
| * The system will always be connected to the grid, unless there is a power outage. | * The system will always be connected to the grid, unless there is a power outage. | ||
| - | * During a power outage, the Multi will power the loads until Low DC voltage disconnect set-point has been reached. | + | * During a power outage, the Multi will power the loads from the battery, |
| - | * Grid and solar will be used to charge the batteries: | + | * After a power outage, grid and solar will be used to charge the batteries. By default, charging |
| - | * Charge rate from solar needs to be configured in the MPPT(s) | + | * Once batteries are fully charged |
| - | * Charge rate from Multi can be configured with VEConfigure. Note: do not disable | + | * Input current limiter |
| - | * After a power outage, the battery will first be fully recharged, using both all available grid and solar power | + | * Setting an input current limit works as usual, and can be used to do peak shaving. |
| - | * Once batteries are full (Multi switches to float), excess solar will be used to power loads > 50 W | + | |
| - | * Input current limiter: | + | |
| - | * Setting an input current limit, works as usual, and can be used to do peak shaving. | + | |
| * When necessary, the charge current will be reduced to prevent going over the limit (Power Control) | * When necessary, the charge current will be reduced to prevent going over the limit (Power Control) | ||
| - | * When reducing the charge current is not enough, the Multi starts Power Assisting: | + | * When reducing the charge current is not enough |
| - | * No energy will be fed back to the grid | + | |
| * Absorption phase is not skipped during charge, in contrast to the other polices in Hub-1. Because of this, and also because the grid will be used to charge the battery, there is no automatic maintenance charge needed. To do an equalization charge, trigger it manually by toggling the front switch on the Multi. Note that enabling (automatic) equalization on the MPPT might not always work: when there are AC loads, the Multi will take the extra power from the MPPT and use it to power AC loads, instead of letting the MPPT perform its equalization phase. | * Absorption phase is not skipped during charge, in contrast to the other polices in Hub-1. Because of this, and also because the grid will be used to charge the battery, there is no automatic maintenance charge needed. To do an equalization charge, trigger it manually by toggling the front switch on the Multi. Note that enabling (automatic) equalization on the MPPT might not always work: when there are AC loads, the Multi will take the extra power from the MPPT and use it to power AC loads, instead of letting the MPPT perform its equalization phase. | ||
| - | * This policy can be used in single-, split and three phase configurations. The Hub-1 Assistant must be loaded in all phase masters or, in case of using a VE.Bus BMS, in in all devices. The easy way is just to load it in all devices. If it is not needed in a device, you will get a notification about that. | + | * This policy can be used in single-, split and three phase configurations. The Hub-1 Assistant must be loaded in all phase masters or, in case of using a VE.Bus BMS, in all devices. The easy way is just to load it in all devices. If it is not needed in a device, you will get a notification about that. |
| - | * This policy can be combined with the ' | + | * Note that solar power will only be used to power the loads when the Multi is in float. The loads will be powered from the grid during the bulk and absorption phase. |
| + | |||
| + | === Advanced: changing charge current from grid based on Battery SOC === | ||
| + | The 'Hub-1 Connected to mains, no feedback | ||
| + | |||
| + | As an alternative to a simple on/off switch, it is also possible to connect the Multi Aux input to the relay of a BMV, and configure that to close when (for example) the SOC is below 80%. That way, it is possible to fast charge the batteries, using the grid, when the battery is below 80%. And above 80% use no or limited charge power from the grid and rely on excess PV power for charging. | ||
| + | |||
| + | {{ : | ||
| ===== DISQUS ===== | ===== DISQUS ===== | ||
| ~~DISQUS~~ | ~~DISQUS~~ | ||
| + | |||
assistants/self_consumption_hub-1_policy-5.1446301245.txt.gz · Last modified: 2015-10-31 15:20 by mvader