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You’re right to pay attention to that. The blinking ‘overload’ LED is the MultiPlus-II’s way of giving you a heads-up that you’re pushing it a bit too hard.
It means the power demand from your connected devices is exceeding what the inverter was designed to handle at its nominal output. It’s not an emergency yet, but it’s a pre-alarm, telling you to ease off a little before it becomes a full alarm state.
You might want to check what’s plugged in and see if you can turn off a few items, or check for devices that might be drawing more power than usual.
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If your batteries are charging while your inverter is under a heavy load, the batteries’ charge load is also contributing to the overall consumption, essentially adding to the load the inverter has to manage.
Your inverter only has so much load it can handle. The Multiplus II 3000VA model can handle 2400W max load, while the Multiplus II 5000VA model can handle 4000W max load.
Check your model’s official data spec sheet to see how much load it can handle.
A practical step you can take is to decrease the battery charge current to help mitigate the risk of overloading. You can do this through the Cerbo GX settings menu by navigating to:
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DVCC (Distributed Voltage and Current Control) and then
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Enabling “Limit Charge Current” setting.
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This will then allow you to edit the “Maximum Charge Current” setting in A (amps).
How this works:
The lower the amps, the lower the total watts (W) that the batteries will consume.
For example:
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If you are on 25A charge current and have a 54V battery, your battery charge load will be 25A x 54V = 1350W.
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However, if you were to lower the charge current to say 10A, your battery charge load will be 10A x 54V = 540W.
So let’s say you have the Multiplus II 3000VA model with a 2400W max load. If you are charging your batteries at 25A x 54V = 1350W, you only have 2400W-1350W = 1050W load remaining for the rest of your home during its charging state.
However, if you were to lower the charge current to say 10A (540W), then you have 2400W-540W = 1860W load remaining for the rest of your home during its charging state, leaving you with much more headroom to avoid an overload.
Long story short – This will reduce the charging current to the batteries, freeing up some capacity for your other loads and helping to prevent the inverter from hitting an overload state.
The only drawback is that the battery will naturally charge slower, but in most cases this isn’t an issue, as LiFePO4 generally charges very fast to begin with.
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