Parasitic Drain?

[howson]

bellis, scdock, bertschb and @yoda

I hadn't tried the remote configuration in VE Configure 3 via the Victron Connect portal--works great! I was able to capture my Multiplus' settings sitting here in front of my computer without going out an hooking up an MK3 to the Multiplus. Awesome!

Full information here: https://www.victronenergy.com/suppor...loads/software

Since I have the ESS Assistant loaded there will be a few settings that are slightly different from what yours may look like.

[bellis]

From the BMV's manual (should be the same for the SmartShunt)



Below are the differences between our Battery settings. I suspect the Charge detection time is the issue, but I leave any decision to make changes up to you.

I may start with changing Charge detection time to 30m like yours. Battleborn recommends 3m.....but I don't see where that would hurt anything. Where did you find 30m for a setting? AMSolar or elsewhere?

https://battlebornbatteries.com/faq-all-about-bmvs/

• Battery Capacity: Total Ah of your bank of batteries
• Charged voltage: 14.4V but note that this number should be about .1 or .2 volts below the charging voltage set in your charging device
• Discharge Floor: 0%
• Tail Current: 2-4% is good
• Charged Detection Time: 3m
• Peukert Exponent: 1.05
• Charge Efficiency Factor: 99%
• Current threshold: 0.10A
• Time to go averaging period 3m
• Battery Starts Synchronized: blue button should be to the right
• State of Charge: leave alone
• Synchronize SOC to 100%: Leave alone, this device will sync itself at the top of the charge
• Zero Current Calibration: Leave alone

[bellis]

bellis

Differences in our SmartSolar settings:

Where did you get your MPPT settings from? I think your Absorption time is off here....For 4 batteries I would have thought this would be 2 hours? Where did you get these from as well?

Here is from Battleborn's site:

• Absorption voltage: 14.6 volts (acceptable range is 14.4 to 14.6 volts)
• Absorption Time: The recommended settings for our lithium batteries is half an hour per 100ah of LiFePO4 battery (for example if you have 2 -100ah batteries select 1 hour).
• Float Voltage: 13.5 volts (13.6 volts or lower is acceptable for LiFePO4 batteries)
• Equalization voltage: 14.4 volts (you do not need to equalize Lithium ion, you will have equalize turned off, but incase it ever runs a cycle the batteries will be fine at this voltage)
• Temperature Compensation: should be disabled on Lithium Deep Cycle batteries because they do not need to be compensated, leave this off.
• Low Temperature cut-off: Our Battle Born Batteries have low temperature charging protection built into the battery, its monitored by our Battery Management system which is also built in. You can leave this off too, some other brands do not protect your battery against damage from low temp charging, we do, we have got you covered.

[bellis]

No. VE.Smart Networking is used for Victron components to communicate with each other IF there's no GX device in the system. Your devices "talk" via VE.Direct.

From a Victron document:

VE.Smart Networking is designed for small systems which do not have a GX device - such as a Color Control GX or Venus GX. In systems which have a GX device, do not use VE.Smart Networking - See FAQ 6.

That's very helpful....I had forgotten that.....I knew I didn't set it up for a reason....but I couldn't remember.

[bellis]

bellis

To make sure we're comparing apples-to-apples, these are the firmware versions in my system:

I was forced to update the Smartshunt1000 firmware 2x last night. I think the VRM page has just not caught up on latest yet. I had checked for firmware updates through VRM not long ago, but victron app on phone would not allow me to proceed without updating.

[howson]

bellis -- I don't remember where I got the settings.

[bellis]

bellis, scdock, bertschb and @yoda

I hadn't tried the remote configuration in VE Configure 3 via the Victron Connect portal--works great! I was able to capture my Multiplus' settings sitting here in front of my computer without going out an hooking up an MK3 to the Multiplus. Awesome!

Full information here: https://www.victronenergy.com/suppor...loads/software

Since I have the ESS Assistant loaded there will be a few settings that are slightly different from what yours may look like.

That's the only way I have ever done it. I didn't even buy the USB dongle. It's fantastic....was a little painful to learn at first....

What ESS are you running and why? I think I need to move in that direction....but haven't looked into. I want to prioritize solar > shore power.

[bellis]

bellis -- I don't remember where I got the settings.

Thought I would post a quick summary of our settings differences - so I could jot some notes etc.

Battery Settings (Shunt)
Charged Voltage - howson14.4V / bellis 14.2V
Tail Current - howson 2.00% / bellis 4.00% - I need to look at this one. Not 100% sure what it is.
Charged detection time - howson 30m / bellis 3m - this one may be significant for me as it relates to the issue? I may change this.

MPPT Settings
Float Voltage - howson 13.60V / bellis 13.50V - this is probably an insignificant difference?
Absorption Time - howson 30m / bellis 1hr 30m - I think you should look at changing this one....
Tail current - howson 2.0A / bellis 1.5A - I need to look this one up as well.

Mulltiplus - I am curious why our settings are different here....but I don't think these ones are related to the issue at hand.
AC Current Input - howson 50A / bellis 30A
Inverter - DC input low shut-down - howson 10.00V / bellis 11.50V
Inverter - DC input low restart - howson 10.90V / bellis 12.50V
Inverter - DC input low pre-alarm - howson 11.00V / bellis 12.00V

The shunt is not supposed to detect SOC based on voltage. Supposedly it tracks amp hours through the shunt in both directions and just tracks usage.

[howson]

bellis

I'll be updating the thread on the ESS for bertschb (he asked me awhile ago for info but haven't done it yet). I'm actually making notes right now. Keep an eye out for the info.

IMHO I suggest finding (and fixing) the SOC issue before messing with ESS. "Baby steps" with Victron equipment...(crawl, walk, run). Mess something up and it will get expensive--real quick.

I'm willing to experiment with my equipment,to try and get the most performance from the components, but anyone who attempts a change on their equipment has to accept the responsibility for their equipment (and be comfortable with the risk). In other words, don't blame me if something goes wrong.

Howard

[howson]

Absorption Time - howson 30m / bellis 1hr 30m - I think you should look at changing this one....

You triggered a memory. I searched back through my email and found an email exchange with Garret Towne (AMSolar engineer).

Also, you might want to consult AMSolar's setup guide (URL is in the email below). FYI, I can remember finding different setting recommendations on different websites. All I can tell you at this point is...mine seem to work with no issues and have for some time. YMMV.

[bertschb]

When I contacted Battle Born to get their recommended settings for their new BBGC3 270ah battery, I was told the following (and I'm only pointing out differences here from what Howard shared above):

SMART SHUNT
Charged Voltage- "14.4v but note that this # should be about .1 or .2 volts back of what the charging voltage is set to in your charging device". Because of this statement from BB, I set mine to 14.3v
Charge Detection Time- I was told to use 3m

SMART SOLAR
Absorption Time- I was told to use 30m per 100ah of battery capacity so mine is set to 2h 40m (540ah of battery capacity)

BTW Howard, the firmware for my Smart Shunt is the same as your BMV-712 - latest is v4.05, installed is v4.07. Go figure...

[howson]

When I contacted Battle Born to get their recommended settings for their new BBGC3 270ah battery, I was told the following (and I'm only pointing out differences here from what Howard shared above):

SMART SHUNT
Charged Voltage- "14.4v but note that this # should be about .1 or .2 volts back of what the charging voltage is set to in your charging device". Because of this statement from BB, I set mine to 14.3v
Charge Detection Time- I was told to use 3m

SMART SOLAR
Absorption Time- I was told to use 30m per 100ah of battery capacity so mine is set to 2h 40m (540ah of battery capacity)

BTW Howard, the firmware for my Smart Shunt is the same as your BMV-712 - latest is v4.05, installed is v4.07. Go figure...

The Charge Detection Time they recommend is probably without considering a solar input. If your SmartShunt SOC resets to 100% SOC before it's actually done charging this is probably the culprit per the Victron manual.

As I stated to bellis, there are multiple setting recommendations across different websites for Victron equipment with Battle Born batteries. I can't explain the "why" for all of the differences. Engineers also agree on everything, right?

[bellis]

The Charge Detection Time they recommend is probably without considering a solar input. If your SmartShunt SOC resets to 100% SOC before it's actually done charging this is probably the culprit per the Victron manual.

As I stated to bellis, there are multiple setting recommendations across different websites for Victron equipment with Battle Born batteries. I can't explain the "why" for all of the differences. Engineers also agree on everything, right?

Wouldn't the shunt being at 100% update the Cerbo?

I know - engineers right? lol

[bellis]

I ended up calling and emailing Battleborn last week. Waiting on a response from them.

[Guest]

My hopes are for lithium charger manufactures to make a temp compensated charger which lithium batteries should have. AIMs makes a temp compensated charger but I didn't like that the cooling fan was on all the time, so I returned it. The charge on lithium batteries should begin to taper down the current as the temperature drops to around 45F. To help with this, a 0.5C charge will keep you in the reasonable range but below 40F will be too high. Look at the charge curve on Trojans lithium batteries for temperature. They are the only ones that I've seen that actually puts out accurate information on charge versus temperature.

Jim