question

Juraj Nikolov avatar image
Juraj Nikolov asked

Cannnot charge battery more as 70%

Hi,

I want to ask where I'm doing wrong :)
Battery cannot be charged to more than 70% :(
I use it as OffGrid


1x MPII 5KVA
config in photo - I got editet

3x mppt bluesolar 150/45/48V (user defined: absor.V: 55.2; floatV: 53.6; rebulk V offset 0.6V; absorption time 1h, end current - off; equalization current % 0; equalization mode. stop fixed time 2h; temperature compensation - off) It is possile to sychronize MMPTs conected via Ve.direct o GX-MPII (???) should be manage the charge currnet and voltage ??? Or Mppts it be watchig the voltage and current will be optimized by each mppt self via battery voltage ? I ask it because give me notification: protection (current sensor abnormaly)... I dont know what it correctly mean :)

1x SmartShunt 500A/50mV (battery setting: capacity 280Ah; charging voltage 55.2; discharge bottom - 10%; terminal current - 4%; charging detection time - 3m; peuker expo. - 1.05, charging efficiency 99% 0, 1 current A; average duration - 3 m)

2x 16-cell lifepo4 280Ah - only 1x16-cell battery connected so far,
BMS - JK-B2A24S20P It would be nice if GX could work with two or more BMS from JK... but it doesn't work...

For a better review, see the photo in the attachment:

BMS

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Multi

general.JPGgrid.JPGcharger.JPGinverter.JPGvirtualSW.JPGassistant.JPG

Changed the charger setting to absorsion 55.2V, Float 53.6V and max absortion time to 1h.

VirutualSW and assistants are also disabled - now.


Thanks for help.

battery charging
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charger.jpg (89.8 KiB)
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2 Answers
Alexandra avatar image
Alexandra answered ·

@Juraj Nikolov

Never mind the percentage right now, does the battery reach 55.2V ever?

On the GX what is monitoring SOC is it the inverter or the shunt?

Check it here Settings - System Setup - Battery monitor.

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Alexandra avatar image Alexandra ♦ commented ·
If the battery is reaching the correct voltage then it is charging correctly but maybe the system is not reporting right.
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Juraj Nikolov avatar image Juraj Nikolov Alexandra ♦ commented ·

Battery monitor was set on automatic 1659101296227.pngI set it on Shunt now

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Juraj Nikolov avatar image Juraj Nikolov Alexandra ♦ commented ·

But on BMS is showig allso 55.27V but only 70% and battery is charged on remain 198Ah, the capacity of cells was testet and capacity was 298Ah :) just 100Ah is some gone :)


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Juraj Nikolov avatar image Juraj Nikolov commented ·

yes, the value of 55.2V was reached many times, then it goes to 53.6 and again to 55.2, both on BMS and via SmartShunt or Multi.

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Alexandra avatar image Alexandra ♦ Juraj Nikolov commented ·

@Juraj Nikolov

Excellent. So charging fine.

If it still does not show 100% after a full charge, then we may need to check some more settings after a day or two.

You can connect the mppts to the GX device they need the VE direct to ve direct cables. Or the ve direct to usb (and use a powered usb hub maybe) depending on how many ports you have free.

It is not strictly necessary to have the mppts be synchronised, but it is nice to see their production all in one place on the GX.

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Juraj Nikolov answered ·

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