MultiPlus II 48 3000 on Float but Low Battery Flashing

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Warwick Bruce Chapman asked Jan 19, '19

MultiPlus II 48 3000 on Float but Low Battery Flashing

My MultiPlus-II 48/3000/35-32 is connected to a parallel set of 2 x 48V banks of 4 x 12V lead-acid batteries in series.

For the first week, it was only in charger mode and for all but the first hour, the *FLOAT* LED has been on.

Today, I connected AC out and put all my network equipment on the AC out and flipped the switch from charger mode to on. Everything has powered up and is running (off the AC passthrough) and I tested the inverter and it seemed OK.

BUT, the *LOW BATTERY* LED is flashing. That is weird. Because the charger is also on and the *FLOAT* LED is on suggesting the batteries are fully charged.

Does the "DC input low pre-alarm" value need to be reduced?

This is the battery array:

This is a video of the LEDs:

Your browser does not support HTML5 video.

low battery warning

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Modifications Space

Node Red Space

Answer 1 · 2019-01-20T20:42:49Z

Warwick Bruce Chapman answered · Jan 20, 2019 at 08:42 PM

In the absence of any replies, I reduced the restart voltage to the float voltage on the charger tab and reduced the pre-alarm voltage to 52.00V (thumbsuck).

Surely there must be standard voltages for battery types for these parameters?

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Warwick Bruce Chapman commented · Jan 22, 2019 at 05:49 PM

This was the first comment I posted before the post above with 47, 51 and 49V.

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Answer 2 · 2019-01-21T18:06:23Z

Warwick Bruce Chapman answered · Jan 21, 2019 at 06:06 PM

On the advice of a friendly Victron distributor in Cape Town, I have configured the shutdown, restart and pre-alarm values as below:

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wkirby ♦♦ commented · Jan 21, 2019 at 08:02 PM

Howsit

Do you have ESS runing at all? If so, then there will also be Dynamic Cutoff Voltages to configure in the ESS assistant.

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Warwick Bruce Chapman wkirby ♦♦ commented · Jan 22, 2019 at 05:47 PM

Nope. I will need to read more about ESS. I see that it is for saving some power but I need to understand better before I use it.

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Warwick Bruce Chapman wkirby ♦♦ commented · Jan 22, 2019 at 05:48 PM

Also, I believe that when ESS is enabled, these three values we are talking about are ignored.

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Answer 3 · 2019-01-21T20:21:40Z

Rob Duthie answered · Jan 21, 2019 at 08:21 PM

Hi

They are about right, my settings for a AGM bank are 40v, 48v, 49.60v in that order

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Warwick Bruce Chapman commented · Jan 22, 2019 at 05:46 PM

Thanks Rob. Your restart voltage Ian lower than your Pre-alarm. What’s your thinking there? You’d rather fire up the internet again while the batteries are charging?

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