discharge level Image

discharge level

How to switch Phoenix Inverter based on battery SoC% via VenusOS and VE.Direct

Hi, i have a off-grid system build from a SmartSolar 100/20, a SmartShunt, a Phoenix 24/2400 and 16x Hawker SBS40 as 8P2S.


These are connected to a VenusOS-Raspberry via Original USB adapters and everything basic works as expected.

Now i search for a way to tell the Phoenix to only switch on, if the SOC is above 50%, to keep my batteries safe.
But I cant find any Option for doing so, only for using cutoff voltage, which feels a bit stupid to use when there is a known SoC% aviable to the system.

Best regards
Miriam Schwarz

miriam-schwarz asked
miriam-schwarz edited ·

2 Answers

Connecting same capacity, different discharge rate Lithiums in parallel

Hi,

I’ve installed a phoenix inverter 12/3000 that is connected to a 100ah lithium superpack in my RV.

I would like to connect a 2nd 100ah lithium superpack in parallel, but this one has a max discharge rate of 50ah instead of 100ah max discharge as on the first battery.

Would that be a problem, as the 2nd battery will discharge much faster & they will have two very different voltages for charging?

Is there a way to mitigate this problem by adding a standalone charger to the 2nd battery or is there another solution I haven’t thought of?

I realize I need to charge both batteries to the fullest before connecting them in parallel so that they will have minimal difference between their voltage.

Thanks in advance!

Eli

Eli asked
Eli commented ·

1 Answer

Lynx Smart BMS 500 - Discharge Floor - Hibernation Mode - self adjustment

Hello Victron Community,


We have the Lynx Smart BMS connected to one 12,8V / 200Ah Lithium battery. I think usually the battery capacity used with the Lynx Smart BMS 500 is bigger. Therefore the capacity reserve after going into hibernation mode is also bigger.

In our case the Lynx Smart BMS discharges the battery down to 8,5V before it powers completely off. Power consumption in hibernate mode 12V system is 0.25mA - 0.35mA .


MY QUESTION:

Will it be possible to self adjust the discharge floor for smaller battery capacities & switching Bluetooth off to lower the Power consumption in hibernate mode?


The best option would be that the user could self adjust the discharge floor parameter higher than 15% himself. For safety reasons the minimum discharge floor parameter can be 15%.



Relavant passages from the manual:



"Discharge floor The “Discharge floor” parameter is used in the time remaining calculation. The battery monitor calculates the time it takes until the set “discharge floor” has been reached. It is also used to set the state of charge alarm defaults. The discharge floor parameter is fixed at 15%."



"9.3.7. System in sleep or hibernate mode This is indicated by the status LED off and the Bluetooth LED flashing every 3 seconds. The Lynx Smart BMS goes into sleep or hibernation mode once the battery or a battery cell has been deeply discharged. The Lynx Smart BMS will conserve as much power as possible, to not discharge the battery much further. Bluetooth is still active, but other non-essential circuits are turned off, including the power to the Lynx Distributor(s). Check the voltages of the connected batteries and if they are low, charge the batteries. As soon as the Lynx Smart BMS sees a charge voltage it will automatically re-activate and close its contactor to allow for battery charging."



"Hibernation mode The Lynx Smart BMS is in hibernation mode when the Lynx Smart BMS has turned itself off because of a low battery event or when it has been turned off via the remote on/off switch. In hibernation mode, the contactor and most of the electronic circuits are turned off and the power consumption is very low (0.8mA). The status LED is off. The power to the Lynx distributor(s) is turned off. Bluetooth is still active during hibernation mode. The blue Bluetooth LED is either flashing every 3 seconds or is on, depending on whether there is an active Bluetooth connection with the VictronConnect app. The Lynx Smart BMS will come out of hibernation mode when the remote on/off switch is switched on or the batteries are charged."

martin-fi asked
Stefanie answered ·

1 Answer

Battery Protect connected to a inverter (using LYNX Dist.) schematic

Hi,

I want to make a 12v battery system, charged from PV via MPPT (two Panels in series 400W each).

The idea is to use is in case of a blackout for home appliances like fridge, TV ....

The system is based on folowing components:

- Victron LYNX Dist.

- Enclosed DC 16A Switch - DC Disconnect (PV Disconnect from MPPT)

- Victron smart shunt

- Victron MPPT 150/70 charge conntroller

- Victron 100A smart BP.

- Victron ON/OFF Master Battery Switch (275A)

- DIY lifepo4 batteries with BMS (JBD or JK BMS)

- 2000W DC-AC(230V) Inverter with remote switch (non Victron)

Can I use the BP in that constellation ? Or should I avoid using the component ?

Generally, the BMS has the role of keeping the battery status under the eye (all 4 cells individually with balance option) so in case of any under voltage of any cell it will cut off the "-" wire which then leads to a system shutdown (load disconnect).

My question are:

- what happens with the MPPT controller if the battery gets disconnected and the Solar PV are still providing power to the component ?

- how to connect the BP in such a system - schematic would be great !?

- should I connect the Inverter directly to the battery via LYNX Dist (with fuse of course)?


I have read some posts on the internet which say that the BP should not be connected directly to the inverter (inline) because of an inrush current. Can someone please explain how should this be done properly !

If this is the case the BP is just useless in my case or am I missing here something ?

regards

Andrzej






ary asked
JohnC commented ·

1 Answer

Lowest temp for Smart LiFePO4 DC load operation?

Hey there,

I know the Victron Smart LiFePO4 batteries should not charge below 41*F/5*C. Is it still OK to discharge and run DC loads at 41*F/5*C or below? What would the low temp cut off be for discharging the batteries, if there is one?

Thanks for your input!

roachmon asked
wkirby answered ·

1 Answer

Does the BlueSolar MPPT 100/30 support Lithium recovery for fully discharged batteries?

I'm considering the purchase of a BlueSolar MPPT 100/30. Does it support the battery recovery function if I fully discharge my lithium batteries? This capability is mentioned in the SmartSolar datasheet, but not the BlueSolar datasheet. I've reviewed both user manuals, but that did not help. I don't want a SmartSolar because you need a laptop to reenable internal BlueTooth once it is turned off.

wandering-parakeet asked
kevgermany commented ·

5 Answers

14,3kWh Speicher: Warum ist meine Entlade-Menge so gering?

Grüß euch!

Habe einen Speicher mit 16x Lifepo4 280Ah Zellen, sollten nun also 16x3,3x280 = 14,3kWh sein oder?


Unten seht ihr diese Nacht beginnend von gestern 16:00 mit vollem Speicher (absorbtion & float voltage eingestellt auf 55,2V = 3,45V pro Zelle).

Heute um 5:00 früh erreichte der Speicher SOC 10% und war somit leer.
Von 6:00 bis 8:00 bin ich noch auf SOC 0% runtergegangen um zu sehen wie meine Zellen-Balance ist.

Mein Problem: Bei einem Gesamtverbrauch von 15kWh in dieser Zeit sind nur 7,7kWh vom Speicher gekommen!!??
Kann das korrekt sein?


Das würde ja heißen mein 14,3kWh Speicher liefert bei einer Entladung von 55,2V auf 46,4V nur 7,7kWh!?

(Habe keinen externen Zähler oder Sonstiges:
3x Multiplus 2, Cerbo-GX und 2x MPPTs. Ganzes Haus hängt am OUT1)


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puitl asked
kevgermany commented ·

0 Answers

3 Answers

Depth of Discharge - VictronConnect

Is there a way to use VictronConnect to monitor DoD while in inverter mode on a Multiplus II 24 3000 ?

Thanks

stephenh asked
ddickov answered ·

1 Answer

Disconnect BMVs SoC depended relay function and discharge floor

Guys, there have been several request now cause there are numerous applications, where a user wants to switch devices based on the SoC, WITHOUT changing the discharge floor.


In my application, I want to use the BMV-700 relay to switch a large power relay to reverse IN/OUT of my Orion, to charge the starter battery as soon as the AUX battery SoC is above 95%. But in regards to the time-to-go, I want to leave the discharge floor at 25% (75% DoD).


I urge you to take these request into account when determining the scope of the next firmware update. Please !!

cstenger asked
cstenger edited ·

0 Answers

Newbie Troubleshooting Questions

Hello,

About two months ago I had a system installed as itemized below and have read most of the manuals so far. I am not an installer and have no prior knowledge or skills in solar systems so please keep that in my mind when responding.

I am thankful for this forum and, like many users, will be consumer at first before I can contribute to others. If I don't thank you when you respond, please know that I do appreciate your responses.

Question 1
Often, when my battery bank is completely charged, I will turn on my inverter to run the air con for a couple hours or other power-hungry devices like the microwave or induction stovetop. Almost immediately after turning on the inverter, my Skylla-i Control GX unit will flash the red, "Low Battery" light then turn off the air con. Then, 10 seconds to a minute later, the light will go off and the air con will start back up. This process will repeat non-stop. Why does the "Low Battery" light come on when my 1,000AH battery bank is fully charged?

Question 2:
I read somewhere that it's not ideal for lithium batteries to always be topped off and in float mode between uses, as mine are. Is that true? Will the answer depend on whether you are full-timing or storing your RV?

Question 3
I read that one of the benefits of lithium batteries is that you can safely discharge them to at least 20%. However, my installer set the "Discharge floor" value to 48%. Does that seem reasonable or can I safely change that to 20% to reduce my costly and noisy generator use?

My 2021 Dynamax DX3 RV solar system the following key components:

- BMV-712 Smart Battery Monitor
- 6 x 200-watt solar panels
- 5 x 200 AH Victron Lithium Batteries
- Multiplus Inverter/Charger 12V / 3000VA / 120amp
- VE.bus BMS
- VE.Bus BMS Mains Dectector
- SmartSolar Charge Controller MPPT 150/100 \
- Tr VE.Can
- Skylla-i Control GX
- Magnum MS2812 Inverter/Charger

gregarious asked
gregarious commented ·

1 Answer

Doubts Smartshunt cycle counting.

Good evening, I have been a very satisfied Smartshunt owner for about 2 weeks.


But I have some doubts.

1) I would prefer victronenergy to change the cycle count setting.

In fact, the software only counts a cycle when the battery drops below 65%. This is misleading.

I use a total of 190ah on the camper and the average discharge is 10/15%.

It may turn out that an Agm battery reaches the end of its life and the Smartshunt records only a few dozen cycles.

When in reality the battery has done the 1000/1200 cycles of 15/20% discharge.Cycles that are not counted by the Smartshunt.

Fortunately, the synchronization count is more realistic. Since a synchronization is counted every time the Soc goes below 90% and goes back to 100%.

So I associate the synchronizations with the number of cycles.

It is not possible that in two weeks of daily use it has only 2 cycles.

In reality I am 15 cycles of 20% of discharge... in fact I have about 15 synchronizations.

Otherwise my batteries will die with only 10/20 cycles recorded.

FRA asked
mryoshii answered ·

3 Answers

Battery voltage dropping suddenly

Morning,

I've got 150Ah of batteries (wired up in 2 series arrays at 24V, arrays wired in parallel). Because the weather was rubbish yesterday my 300W of panels only hit 100W peak, but I went into the night with about 23V and discharging slowly.

At 3am, my batteries dropped from 22V to 14V in the space of an hour and everything went offline.

[image]

Is this normal behaviour? If so, is there a way I can avoid it happening again?

My SmartSolar charger is a 100//15 so I could feasibly add another panel to help charge it, but that doesn't explain the batteries behaving weirdly.

tom-galletti asked
tom-galletti commented ·

1 Answer

Multiplus-II cuts off at 40.6 Volt (too early)

Hello, I'm new to the forum and have already read some posts but haven't found a solution to my problem yet.

Here it is:

I am using a Multiplus-II 3000 in ESS mode. I connected 2 Tesla Model X battery modules. Overall, it is a 12S system. (50.4 volts - 36 volts) I want to shut down at 37.2 volts while discharging (I understand this is the lowest possible setting) but my system starts reducing the discharge current as it approaches 40.6 volts. I tried with the "shut-down on SOC" option and without - nothing works.


thanks in advance!


[image]

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markde asked
klim8skeptic commented ·

0 Answers

Phoenix Inverter 12V 375V, 230V - Meaning 'Voltage for discharge current'

I have put together an off-grid system to build up knowledge and experiment with it.

Setup

  • 2x connected in series, self-built solar panel, (81W / 9V per panel) = 162W / 18V total.
  • Victron Smartsolar-mppt 75-15
  • Victron Phoenix Inverter 12V, 375VA, 230V
  • Victron AGM battery Deep Cycle 12V 90Ah

With a small load, the inverter gives an alert fairly quickly that the voltage is too low.

I have a question about the inverter settings that can be made via the app.

In the accompanying documentation and on the Victron website I have searched everything for the meaning of settings, but I cannot find this information. I may be overlooking something.

In the section 'Dynamic cut off' it is possible to adjust 4x the voltage at 'Voltage for discharge current'. At 0, 23, 63 and 180A.

What is the significance of this?

jan-willem asked
jan-willem commented ·

2 Answers

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