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nick-herasimenka avatar image
nick-herasimenka asked

Multiplus 12/3000/120 Overload in cold weather (under 10°C)

Hi,

I have a solar-powered 12-volt system with Multiplus 12/3000/120 Invertor used only for AC loads. The system works great at normal temperatures but when it gets colder at night the inverter can't start in the morning and shows an overload warning with no explanation or description (I use VE.Bus Smart Dongle Bluetooth). This happens almost every time the temperature drops under 10°C. I have researched this and was not able to find anything useful. I only found that the MultiPlus works ok even at -20°C as some users report. This is quite frustrating as I plan to use the inverter full time and can't afford to let it do this number on me occasionally.


Can someone point me in the right direction to solve this? I'm in the US and bought my MultiPus through Amazon and support there is useless.


Thanks


MultiPlus Quattro Inverter ChargerPhoenix Inverter
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3 Answers
janvd avatar image
janvd answered ·

Maybe its not the inverter, but the battery pack. If its a lead acid battery it will lose capacity when cold.

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michelg answered ·

Hi, what kind of batteries do you use ? Manufacturer, model, setup, age of the batteries, Wp coming from your solar panels, may give us a better picture of your setup.

In my opinion, you batteries are depleted and / or too cold in the morning to provide enough power.

Michel

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nick-herasimenka avatar image nick-herasimenka commented ·

My solar set up is:


3 Renogy 100 Watt 12 Volt Monocrystalline Solar Panels

Victron Energy BlueSolar MPPT 100/30 Charge Controller

3 Battle Born LiFePO4 Deep Cycle Batte - 100Ah 12v


I also have VE.Bus Smart Dongle which seats on top of the batteries and reads the temperature right from them. That's where 10C coming from


Everything is in new condition and functioning great during the day.

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Russell Brown avatar image
Russell Brown answered ·

I have the same issue.

400AH Lithium, Multiplus II, Lynx Smart Shunt, Cerbo GX

I found 2 things:

We're in cold weather at the moment, -4 outside and inside the van down to 3 Deg. I have not yet installed the vans diesel air heater.

1) the MPPT's are set to NOT charge below 5 Deg, low temp cutoff set at 5 Deg.

2) The inverter has shut down a few times when we go to make early morning Coffee when the temp in the van is right on 5 Deg.

I found 2 reasons:

- The multiplus has a low voltage shut down set at something like 12.9v from memory. and when I look at the Cerbox GX early in the morning after running inverter, battery voltage does get down to 12.8, 12.9

So thats one reason

Other issue I had which took me a while to workout, I had the Multiplus set for low SOC shut off inverter at 40% SOC. We started cooking with battery SOC at 42% and as it dropped below 40% the inverter shut down, I thought it was some low voltage issue, it was just the low SOC setting.

So maybe check those 2 settings

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