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Is their also a battery-life guard in the inverter, because in winter time our PV system will not produce enough energy to load the batteries , what does the victron offer to prolong the battery life?
Frank
Meanwhile , I found out the I will need 3 multiplus-es in my 3-phase house, correct?
additional , I 'd like to know how the multiplus-es decide when to start charging the batteries and when they decide that battery power should be used instead of grid-power? do they just look at the charge level of battery, when battery reaches 90% charged state (SOC) they start the consumption off the battery until DOD drops below 10% or 20%?
thx for your feedback
You don't need three, its more than possible to use a single unit.
https://www.victronenergy.com/media/pg/Energy_Storage_System/en/ess-introduction---features.html
The venus device (ccgx, venus, cerbo etc) monitors total power in/out and aims to keep the grid meter at 0w (or the set point), until the preset battery levels.
Watch the video in the first link, the second contains info about phase compensation.
In grid failure the system will backup the phase its on.
It is possible to use a single unit, if the solar panels/PV inverter are connected to the grid that is (i.e. not to the "AC load" side of the MultiPlus-II).
Although the components are identical, the way you connect them makes a big difference:
If the PV inverter is connected to the grid, the PV inverter will shut down if the grid fails.
If the PV inverter is connected to the "AC load" side of the MultiPlus-II, the PV inverter will keep working even if the grid goes down. Note however, the PV inverter power should not exceed the power of the MultiPlus-II.
If you want to avoid backfeeding PV energy to the grid completely, you will need as much MultiPlus-II inverter/chargers as you have peak PV production power. From a techical cool factor, that makes sense. It may not make financial sense though. And even with multiple MultiPlus-II, when the batteries are full, you will still feed into the grid...
In the end, the amount of MultiPlus-II inverter/chargers you need depends on the configuration you design/build and your goal. :-)
Hi,
The main goal of the ess system is to keep the main meter at 0.
The ess system can provide all you ask for.
Hello jejochen,
is it possible to program the multiplus so that it will only charge the batteries during the daytime when solar panels are producing an overcapacity of electricity? E.g. Between 10 am and 16 pm
frank
Yes you can. Mind you this is not an intelligent schedule. It does not take into account the effective power that is produced by the solar panels. It just starts charging the batteries at 10:00 every day and stops when at 95% State of Charge or at 16:00 (whichever comes first).
ESS design and installation manual
Parallel, split- and three phase VE.Bus systems manual
Theory on wiring large systems PDF
Three-phase and parallel system theory training presentation
Three-phase & Parallel installation training video
Victron with AC PV online training
AC-coupling and the Factor 1.0 rule
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