I could use some help setting Deligreene BMS parameters.

[John Frum]

Honest mistake really. I didn’t quite get the not “bumping” values.
The BMS LVD is 20 and the CC value is 22. Is that what you mean?

The charge controller should not be in the load path.
Please don't do that, even if you have fire a extinguisher under your pillow.
You should have a low voltage disconnect for your inverter to protect the bms from the brutal assault of disconnecting a load at significant amperage.
As I've said quite often, The bms is a "reserve parachute".
See my previous post where I recommended a solution.

 

[John Frum]

On the other hand, if @HighTechLab is ok with using the bms to disconnect a high amp load then please disregard what I have said.
Is that ok @HighTechLab ?

 

[Jwtravel]

The charge controller should not be in the load path.
Please don't do that, even if you have fire a extinguisher under your pillow.
You should have a low voltage disconnect for your inverter to protect the bms from the brutal assault of disconnecting a load at significant amperage.
As I've said quite often, The bms is a "reserve parachute".
See my previous post where I recommended a solution.

So, the CC LVD should be lower than the BMS setting, correct?
And I need to add a LVD (like the one you mentioned above) between the positive buss bar and the inverter, correct?
And I would want to set that at a higher voltage than the BMS LVD values, correct?
To make sure I understand, I want the loads to disconnect before the BMS or CC disconnects thereby preventing the CC from ever carrying the load, or tripping the BMS? Jeez, I hope I’m getting this right.

 

[John Frum]

So, the CC LVD should be lower than the BMS setting, correct?

The charge controller lvd should be irrelevant to the discussion.
Pretty sure I've said this before.

And I need to add a LVD (like the one you mentioned above) between the positive buss bar and the inverter, correct?

Actually between the battery and all the loads.
The only thing that should bypass it are your charge sources.

And I would want to set that at a higher voltage than the BMS LVD values, correct?

Yes you want to set it high enough so that your weakest cell doesn't nose dive into the low knee.

To make sure I understand, I want the loads to disconnect before the BMS or CC disconnects thereby preventing the CC from ever carrying the load, or tripping the BMS? Jeez, I hope I’m getting this right.

The charge controller is a charge source not a load.
Said this many times.
Are you using the load ports on your charge controller?

 

[Jwtravel]

So, the CC LVD should be lower than the BMS setting, correct?
And I need to add a LVD (like the one you mentioned above) between the positive buss bar and the inverter, correct?
And I would want to set that at a higher voltage than the BMS LVD values, correct?
To make sure I understand, I want the loads to disconnect before the BMS or CC disconnects thereby preventing the CC from ever carrying the load, or tripping the BMS? Jeez, I hope I’m getting this right.

When I choose the LVD for the inverter is it safe to say “worst case scenario” would be pulling 4000 watts of load divided by 24v would be 166 amps. I don’t see ever being near that load range so I feel like a LVD like the Pro Latch rated for 160 amps would be sufficient , yes?

The charge controller lvd should be irrelevant to the discussion.
Pretty sure I've said this before.


Actually between the battery and all the loads.
The only thing that should bypass it are your charge sources.


Yes you want to set it high enough so that your weakest cell doesn't nose dive into the low knee.

The charge controller is a charge source not a load.
Said this many times.
Are you using the load ports on your charge controller?

I am not using the load ports.
From positive buss bar to Pro Latch to inverter and 24v converter? Those are my only loads.

 

[John Frum]

When I choose the LVD for the inverter is it safe to say “worst case scenario” would be pulling 4000 watts of load divided by 24v would be 166 amps. I don’t see ever being near that load range so I feel like a LVD like the Pro Latch rated for 160 amps would be sufficient , yes?

The formula is...
inverter continuous rating in watts / .85 conversion factor / low voltage disconnect.

So assuming a 2000 watt inverter and a 24 volt system.

2000 ac watts / .85 conversion factor / 24 volts low cutoff = 98.039215686 dc amps

That is out of spec high for the least expensive relay and well within spec for the one I specified.

I am not using the load ports.

Good, then the charge controller is not relevant to the low voltage disconnect strategy.

From positive buss bar to Pro Latch to inverter and 24v converter? Those are my only loads.

The only thing(s) that should bypass the Pro Latch are your charge source(s).

 

[John Frum]

@Jwtravel I think I have a cheaper, easier solution.
Are you hardwiring the ac side of your inverter to a distribution panel?
If not I can show you how to make something kinda neat.

 

[Jwtravel]

@Jwtravel I think I have a cheaper, easier solution.
Are you hardwiring the ac side of your inverter to a distribution panel?
If not I can show you how to make something kinda neat.

I need to. I was gonna get by for now but bring it smoothjoey! Whatcha got?

 

[John Frum]

I need to. I was gonna get by for now but bring it smoothjoey! Whatcha got?

Sorry my solution I was going to propose is not compatible with hardwire.

But with a bit more jiggery pokery it can still work.

1. get the 65 amp victron smart battery protect.
insert it between the positive busbar and your 24->12 converter.
This provides low voltage disconnect for your pure dc loads.

2. get a 40ish amp ac rated solid state relay and a 20 amp ac breaker.
The breaker goes on the ac side of the inverter on the live wire
after the breaker goes the ac side of the relay.

3. the control side of the relay is connected to the downstream side of the victron smart battery protect.

I'm sure this is all Greek to you but it should work fine.
It needs to be done properly and safely though.

Then the only load that the bms has to disconnect is the inverter idle draw.

The summary is that the pure dc loads are disconnected directly via the victron smart battery protect.
The inverter ac side is isolated via an ac relay which is controlled by the victron smart battery protect.

 

[Jimmynik1]

Could use some help with my daly 16s bms settings. When it cuts charging im getting "cell volt high level 2".
But the pack voltage and no cell are near their set parameters. The eco worthy hybrid inverter says it only charges a 48v pack at 56.8v. But the pack doesn't get quite there. I've seen it get it to 55.4/5 but that's it. If anyone has any advice or a list of what the daly error codes mean I'd appreciate it.

 

[John Frum]

Could use some help with my daly 16s bms settings. When it cuts charging im getting "cell volt high level 2".
But the pack voltage and no cell are near their set parameters. The eco worthy hybrid inverter says it only charges a 48v pack at 56.8v. But the pack doesn't get quite there. I've seen it get it to 55.4/5 but that's it. If anyone has any advice or a list of what the daly error codes mean I'd appreciate it.

@Jimmynik1 what are the cell voltages and pack voltage when the error occurs?
Does the bms open the charge fets?

 

[Jimmynik1]

@Jimmynik1 what are the cell voltages and pack voltage when the error occurs?
Does the bms open the charge fets?

Cell 8 is my highest and is right around 3.60 when it cuts and the pack is 55.4 ish.
I don't understand the second part.

 

[Just John]

Cell 8 is my highest and is right around 3.60 when it cuts and the pack is 55.4 ish.
I don't understand the second part.

Top balance the cells, cell 8 is full, the rest are not.

 

[John Frum]

Cell 8 is my highest and is right around 3.60 when it cuts and the pack is 55.4 ish.

Did you fiddle with the bms configuration?

I don't understand the second part.

The bms is physically common port but internally there is one set of field effect transistors(fets) for charge currrent and another set of fets for discharge current.
I'm trying to determine if the charge path is open or closed?
If its open, I would like to know what parameter was exceeded causing the trip.

 

[Jimmynik1]

Did you fiddle with the bms configuration?


The bms is physically common port but internally there is one set of field effect transistors(fets) for charge currrent and another set of fets for discharge current.
I'm trying to determine if the charge path is open or closed?
If its open, I would like to know what parameter was exceeded causing the trip.

Yes I made the cell cutoff voltage 3.65

Its a common port as far as I know. Daly 16s 100a with BT.
I found the little toggle that lets me turn off and on charge and discharge and they are both on. So charge path is open until that "cell high voltage level 2" comes on the the charge path turns off then comes back on a little while later.

 

[John Frum]

Yes I made the cell cutoff voltage 3.65

Its a common port as far as I know. Daly 16s 100a with BT.
I found the little toggle that lets me turn off and on charge and discharge and they are both on. So charge path is open until that "cell high voltage level 2" comes on the the charge path turns off then comes back on a little while later.

Ok so the problem seems simple enough, the bms is open the charge path on one or more cells exceeding 3.65 volts.
When the charge path opens the cells settle a bit and the charge path closes again.

Does the BMSs estimation of the cell voltages agree with your DVOM?
Also have you top balanced the cells?

 

[Jimmynik1]

Does the BMSs estimation of the cell voltages agree with your DVOM?

Yep

Ok so the problem seems simple enough, the bms is open the charge path on one or more cells exceeding 3.65 volts.

Makes sense yea.

Also have you top balanced the cells?

I started with the little benchtop dc power supply 5a but after 3 days it barely moved .001v. Then was advised to hook up the bms and charge it off the charger until the cutoff then disconnect and put back in parallel and top balance since the pack will be closer to 3.65.
Pack is 16s 310ah.

 

[John Frum]

Yep

Makes sense yea.

I started with the little benchtop dc power supply 5a but after 3 days it barely moved .001v. Then was advised to hook up the bms and charge it off the charger until the cutoff then disconnect and put back in parallel and top balance since the pack will be closer to 3.65.
Pack is 16s 310ah.

I have the attention span of a goldfish, is the pack top balanced, yes or no?

 

[Jimmynik1]

I have the attention span of a goldfish, is the pack top balanced, yes or no?

Lol no not yet.

 

[John Frum]

Lol no not yet.

Well there is your problem.

 

[Jimmynik1]

So is there a faster way to top balance this other than the little 5 amp power supply I have?

 

[John Frum]

So is there a faster way to top balance this other than the little 5 amp power supply I have?

Yes, get a higher capacity power supply.
Or you can use the little 5 amp power supply to top off low cells.
You can also use a resistive load to knock the heads of the high cells.
You can even do this without breaking the pack as long as you are very careful about polarity.

The way I top balanced my pack was to use my high capacity charger to charge my 8s pack until the high cell tripped.
Then I used a resistor to drop that high cell down in line with the others.
Then I topped off each cell individually to 3.625 volts with a charge voltage of 3.65 volts using a cheap little buck converter.
Took most of an afternoon, I was never more than a few feet from the pack when charging or discharging.
That means I disconnected the charger for bio-breaks.

 

[Just John]

Yes, get a higher capacity power supply.

Yes, he did ask.

 

[Jimmynik1]

Yes, get a higher capacity power supply.
Or you can use the little 5 amp power supply to top off low cells.
You can also use a resistive load to knock the heads of the high cells.
You can even do this without breaking the pack as long as you are very careful about polarity.

The way I top balanced my pack was to use my high capacity charger to charge my 8s pack until the high cell tripped.
Then I used a resistor to drop that high cell down in line with the others.
Then I topped off each cell individually to 3.625 volts with a charge voltage of 3.65 volts using a cheap little buck converter.
Took most of an afternoon, I was never more than a few feet from the pack when charging or discharging.
That means I disconnected the charger for bio-breaks.

Appreciate it thanks!