question

houssem avatar image
houssem asked

Multiplus does not run from battery

Hey, I have the multiplus 48/500/6-16 and it is currently connected to the Grid and everything runs great. and when I cut the power from the AC input,Multiplus turn off and LED's are off .

(if I want to run Multiplus just with batteries, does not work )

batteries are full charged 100%, and When I tested the voltage on my batteries ( Or on the multiplus DC input ) I get 50,20V.

when the AC input is Connected ( with Grid), I can charge batteries and also can descharge them in AC load (AC output from Multiplus)

I did not have this problem last Week.

Please if someone can help it would be great. Thank you.

MultiPlus Quattro Inverter Chargermultiplus ve.bus
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1 Answer
Kevin Windrem avatar image
Kevin Windrem answered ·

Make sure the Multi is in the ON position, not CHARGER ONLY.

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houssem avatar image houssem commented ·
the Multi was in the ON position but nothing happens
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nickdb avatar image nickdb ♦♦ houssem commented ·
What battery is this?
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houssem avatar image houssem nickdb ♦♦ commented ·

4 Batteries Accurat 12V / AGM / 50AH ( Total 200AH / 48V)

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nickdb avatar image nickdb ♦♦ houssem commented ·

That rules out any BMS's being involved.

Does the GX/VRM log any alarms/events - low voltage etc?

Is the UPS function enabled?

50V is quite low for a fully charged set, are you sure the voltage isn't dropping at cutover and the inverter is shutting off?

What are the inverter/charger settings from veconfigure and how does that compare to the manufacturers specs?

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houssem avatar image houssem nickdb ♦♦ commented ·
I dont have any BMS connected.

and No alarms or events for low Voltage in VRM/GX

the UPS function is selected.

I tried it at cutover and there is no drooping VOLTAGE.

I didn't changed any settings from veconfig, and just using default parameters that matching battery specifications

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nickdb avatar image nickdb ♦♦ houssem commented ·

As mentioned below, your battery is 50AH at 48V not 200, so please set the charger accordingly, unless it was a typo.

In case I am misunderstanding you, you shouldn’t use default settings, all charger etc settings should be customised according to the battery spec sheet.

edit: a quick google showed the following charger notes for the battery.

Buffer operation: (e.g. UPS applications) max. 13.7 to 13.9 volts, without limiting the charging current.

Cycle operation: max. 14.6 to 14.9 V, initial charging current must be adjusted to approx. 0.4 C (constant charging voltage).

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klim8skeptic avatar image klim8skeptic ♦ houssem commented ·
Looks like a 48v 50ah batt.
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nickdb avatar image nickdb ♦♦ klim8skeptic ♦ commented ·

True, he has mistakenly totalled AH rating.

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