Orion-Tr Smart 12/12-30 Outputs Less Than Half Amps on 55% SOC LiFePO4. Why?

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Bob K asked Sep 4, '21

Orion-Tr Smart 12/12-30 Outputs Less Than Half Amps on 55% SOC LiFePO4. Why?

My Orion-Tr Smart 12/12-30 Isolated is outputting half or less of its rated amperage to my battery bank, and that amperage falls over the course of a few minutes. With its current performance, its not enough to cover my DC refrigerator (15 amps) and charge the battery bank while I'm driving. What could be causing this?

Here's my setup.

2017 Toyota Tacoma w/ tow package (130 amp alternator) & travel trailer
Two 100Ah Battle Born LiFePO4
6AWG positive and negative wires from starter battery to Orion and from Orion to batteries.
Orion S/N 2048 (appears to be post rev. for overheat changes)
Settings: Set to "Charger", Default LiFePO4, Smart Alternator, default vehicle shutdown
Installation: Open air, 70°F ambient temperature, in upright position
Victron SmartShunt

With the truck at idle after 2 minutes, the voltage at the starter battery posts is 13.5v. Input voltage to the cold Orion shows 13.1v. Cold Orion output voltage to the batts is around 13.5v.

Output amperage of the cold Orion as read by the SmartShunt starts at about 18 amps, well below the rated 30 amps. Battery SOC is only 54%. Vehicle is still at idle speed.

Over just 10 minutes, the output amperage slowly falls to as low as 12 amps. At this point, the Orion is barely warm to the touch.

This occurs regardless of engine speed. The following video shows the low amperage output over time even when the engine speed is held at 2600 RPM. High RPM starts at 00:30 in the video.

https://tv.gab.com/channel/robertknowlton/view/troubleshooting-victron-orion-tr-smart-1212-30-dc-6132bd320c5416cc4db8f256

Likewise, the input voltage to the Orion remains at 13.1v despite holding the engine speed at 2600 RPM.

https://tv.gab.com/channel/robertknowlton/view/troubleshooting-victron-orion-tr-smart-1212-30-dc-6133879c3beab6d020fd5a9f

Where should I begin looking to determine why the output amperage is less than half of rated amperage?

orion-tr smart amps

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Matthias Lange - DE answered · Sep 04, 2021 at 07:05 AM

As long as you have loads running you will never see the full current at the SmartShunt.

Can you make a picture of the "engine shutdown detection" settings.

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Bob K commented · Sep 04, 2021 at 02:20 PM

Thanks, Matthias, for responding. I don't have any loads on the battery bank during this testing so that I can analyze just the Orion's performance.

The engine shutdown detection parameters are at defaults for the Smart Alternator type.

At this point, I'm not having any issues getting the charger to turn on. I just can't get anything more than half amperage output. This snip is from the video with the engine held at 2600 RPM.

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Matthias Lange - DE ♦ Bob K commented · Sep 04, 2021 at 03:15 PM

https://www.victronenergy.com/media/pg/Orion-Tr_Smart_DC-DC_Charger_-_Isolated/en/engine-shuthown-detection.html

Your input voltage from the alternator is close to the shut-down voltage.
The charging current will be reduced if the input voltage is below the "delayed start voltage".
You have to adjust that settings or disable the disable the "engine shutdown detection".

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Bob K Matthias Lange - DE ♦ commented · Sep 04, 2021 at 03:34 PM

Beautiful! That did it. Thank you. I changed the Shutdown voltage to 12.9v and now I'm seeing higher Output voltage (13.7v)...

...and nearly full amperage output (27-28 amps).

I noticed that the charger also pulled the Input voltage down to 12.9v so I may need to reduce it more. I know how to read the graph more accurately now and I'll tweak the settings for best performance.

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Answer 1 · 2021-09-04T17:47:15Z

Rob Fijn answered · Sep 04, 2021 at 05:47 PM

Hello Bob K, one additional remark. It would be good to move the Black wire between the Shunt and the Negative battery pole to the battery Pole at the right hand side battery.
In this way the charger "sees" the same resistance to every battery.
You can read more about this in the Wiring Unlimited book that you can download from the Victron Energy web site.

Regards, Rob

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Bob K commented · Sep 04, 2021 at 06:46 PM

Thanks! I remember that theory now and will make the change.

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Answer 2 · 2021-09-04T18:40:02Z

Bob K answered · Sep 04, 2021 at 06:40 PM

I'm using 6AWG stranded with a one-way circuit length of about 30 feet (so 60 feet total). As a result, I'm also experiencing about a 6% voltage drop (.8v) from the truck battery posts to the input side of the Orion. Voltage at the truck battery posts is 13.6v and 12.8v (Vin) at the Orion.

When I first installed it, I followed Victron's guidance to use 16mm2 (~6AWG) for "10m". I didn't realize that this was the positive conductor length only and that I should have calculated necessary wire diameter for the total circuit length (positive and negative conductors from the truck battery all the way back to the trailer). That would have specified wire somewhere in the 1 to 3 AWG range (depending on which calculator I choose).

It works, but I'm still getting less than full amperage output from the Orion (22 amps or lower in the snip above) after about 10 minutes. The Orion will pull Vin down to whatever Shutdown Voltage figure I have set, but I might be able to toy with the Shutdown Voltage parameter a little more so that the Orion doesn't limit current. I'd really like to take full advantage of my 150-amp alternator.

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klim8skeptic ♦ commented · Sep 07, 2021 at 12:40 AM

You could always wire the remote to an ''ignition" source, as per the manual.

That way the B2B would charge whenever the engine is runing.

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burntjaffle commented · May 12, 2022 at 03:49 AM

Hi Bob, I've just come across this thread and seeing the exact some issue in a 2021 Toyota which has a temperature compensating alternator.

I'm also using 6 AWG on a 10m run (5m pos, 5m neg).

Dropping the shutdown voltage helps but seems that my input voltage on the Orion drops to match it.

Amps on my shunt look OK though when I do this at around 27.

Do you think in your case that the issue is to do with the wire gauge not being thick enough and causing too much voltage drop?

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kevgermany ♦♦ burntjaffle commented · May 12, 2022 at 11:46 AM

Voltage drop is proportional to current (ohm's law) so at zero current you're going to see full voltage at both ends. At about 30A, you're going to lose nearly half a volt.

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Bob K burntjaffle commented · May 12, 2022 at 02:15 PM

Yes, my mistake was using wire gauge that was too small for my total circuit length (60 ft). When I probe the circuit, I'm getting a 0.8v drop over the circuit length.

When the Orion is in bulk charge, my voltages are:

13.6v at truck battery posts (truck at idle)
13.53v after the input side circuit breaker
13.05v at the Anderson connector (truck side)
13.05v at Anderson connector (trailer side)
12.8v at the Orion input screws

I'm also not completely educated on how the smart alternator in my '17 Tacoma is behaving since Bluetooth doesn't reach the Orion or my SmartShunt while I'm driving. In the meantime, I've slowly been adjusting the Engine Shutdown voltage downward. IIRC, I've got the Engine Shutdown voltage set to 12.3v (which means the truck battery voltage is around 13.1v before the .8v voltage loss). That consistently gives me about 22 amps out of the Orion and isn't depleting the battery in my Tacoma.

Long term, I plan to upgrade the wire gauge and maybe get the Bluetooth extender. Short term, I'd like to shorten my wire run using the technique described by this gentleman (ground at the rear of the truck rather than at the battery IOT use the truck chassis as a big negative "wire"). I'll need to check my ground wires to the Tacoma battery and make sure they're of sufficient gauge to handle this.

https://www.jaycoowners.com/forums/f32/time-for-some-2015-185rb-baja-repairs-and-upgrades-75556-5.html#post997931

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dc4me commented · May 12, 2022 at 03:46 PM

I don't think your 150 amp alternator is going to make a difference in what comes out of your charger as long as the charger has enough amps to run. Your settings need to be changed as others has posted.

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Bob K dc4me commented · May 12, 2022 at 03:51 PM

I think what we're both working on is how to put enough of a demand on the Smart alternator such that it will come out of its "power saving" mode and output sufficient voltage and amperage to the Orion. To wit: Despite making the Orion put its full load on the truck's alternator, I rarely see my Smart alternator output more than 13.5v.

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dc4me Bob K commented · May 12, 2022 at 07:00 PM

I have a 2021 Jeep without a regular or smart alternator. My selection was to go with regular alternator setting. Power comes from vehicle battery to power distribution box in rear of jeep. From there power feeds Orion. I set my start up voltage to 13v and disconnect at 12.4. Had to work with absorption values with "User defined" and all seem to work really good to charge LiPo4 battery. Where I going with this is I can't believe your smart alternator is going to put out a voltage less than 13 volts when running. Amps are a different subject. I am only imputing my experience because I am always wanting to learn something that I may not be aware off. Not at all to sound like an expert. Maybe I will learn more.

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kevgermany ♦♦ dc4me commented · May 13, 2022 at 05:17 AM

There are other posts in the community reporting much less than 13V. Could well be correct. But also poor grounding/earthing can affect these values. It will also affect available power due to resistance.

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