question

aizen avatar image
aizen asked

low voltage on inverter while bmv shows 90% battery

hi guys, my system is behaving strangely...thw bmv 700 shows 89%, but the inverter keeps showing low battery alarms and keeps switching on/off. am not on ESS..firmware 2620159...easysolar 48/3000/35....help

EasySolar All-in-One
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2 Answers
Matthias Lange - DE avatar image
Matthias Lange - DE answered ·

And what voltage reading do you have at this moment(BMV and inverter)?
What is the setting for the low voltage cut-off?

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aizen avatar image aizen commented ·

thanks for the prompt response

bmv shows a voltage of 39.9v(89% battery) with load on...without load the voltalge(multiplus off) shows 49.96v

low voltage cut-off is the default havent changed it...its around 43v, if I can remember

Is my battery bank (ceil nxt 12v/200ah x 4) dead?

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Matthias Lange - DE avatar image Matthias Lange - DE ♦ aizen commented ·

What load do you running? 40V is pretty low for a 48V system.
The default low voltage cut-off for a 48V Multi is 37.2V and if you never changed that this can be a reason for your dead batteries now.

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aizen avatar image aizen commented ·

charging from mains

BMV-57.60v with 28.8amp

inverter 57.07v with 29.5 amp

low voltage cut-off 37.2v

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aizen avatar image
aizen answered ·

hi guys, have noted the following behaviour with my battery bank

from fully charged(100%) to around 91%..the voltage drop is gradual and matches the load very well...then it starts leaps of doom...at 90% it shows 46.34v, at 89% it shows 39.72v and it switches off at 88.8% with 37.2v...

is my battery bank gone beyond any hope?

I have been using adaptive+battery safe charging for my nxt ceil agm battery with float voltage of 54.80v and absorption of 58.80v...what did I do wrong so as not repeat again?

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