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2 Replies
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36
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68
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The ‘AC1 input current limit’ setting in the VictronConnect app is an important parameter for managing the amount of current the MultiPlus inverter/charger can draw from its AC1 input source, which is typically the grid or a generator.
Here’s what you need to know about this setting:
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Function: The setting regulates the maximum AC current that the MultiPlus will draw. This helps prevent overloading the AC source and allows you to manage the power distribution if your AC source cannot supply the maximum current the MultiPlus is capable of drawing.
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Activity Condition: This setting is active and controls the input current limit only if there is no remote system control panel installed. If a system panel or external control device is connected and configured, it will override this setting.
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Importance: It’s important to set this limit according to the capabilities of your AC source and the requirements of your system. For instance, if you are using a generator as the AC source, you would set this limit to a value that the generator can handle without tripping.
By adjusting the ‘AC1 input current limit’ properly, you ensure that your inverter/charger does not draw more current than your AC source can provide, which safeguards both the source and your inverter/charger from potential issues.
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21
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I have my Multiplus-II 48V 3kVA inverter setup as a mobile UPS. In other words it’s not connected to the grid, but rather charges independently off a regular 16A plug socket in my home. Just like any other UPS that you buy from retail shops, except mine is a much better quality product.
But to pull this off, it’s important that I used the ‘AC1 input current limit’ setting in the VictronConnect app, in order to make sure that the AC draw does not exceed the 16A current limit of the plug, otherwise it will most likely start smoking or even catch fire.
So, while I could technically set this to a max of 16A, I like to play it safe and wouldn’t exceed 15A in this case.
However; I actually set it to 10A, because my 3kVA inverter only has a rated capacity of 2400W. And if you do the math, taking my average grid voltage and multiplying it by the 10A (235V x 10A = 2350W), it works out to be slightly lower than the Multiplus-II max capacity of 2400W, making it a perfect fit.
If I was using a larger Multiplus-II 48V 5kVA inverter with a max load capacity of 4000W, then I could push it to the 15A to 16A limit, as it would still be below that inverter’s max load capacity (235V x 16A = 3760W). But this naturally causes some capacity wastage, which is why I went with the smaller MPII 3KVA as it is the perfect match for a mobile UPS build.
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