Reply
 
Thread Tools Display Modes
 
Old 06-30-2016, 01:43 PM   #1
Platinum Member
 
Join Date: Aug 2010
Location: Minnesota
Posts: 7,321
Default Battery monitor use and settings

Some recent contacts with another member concerning settings for their Trimetric battery monitor has made me wonder how others are handling the settings.

The Trimetric, and probably most other monitors, determines if the batteries are full by making sure they reach a minimum amp setting at a set voltage. The amp setting is determined by the batteries used and is a % of capacity, normally, and between .5 and 3% of the 20 hour capacity. The voltage you set for the voltage threshold is usually a .1-.2 volts under the temp corrected absorption setting for you charger. If the batteries see absorption voltage and the amps get below the amps setting, the Trimetric lights the fully charged indicator and considers the batteries full. The display will show over or under 100% at this time, in most cases, do to charge efficiency, but the amp hour counter will be accurate. Having 5-10% more amps returned than was used is normal, so the AH counter will be in the plus direction by that much. When you shut off the charger, and start to discharge off the batteries, the Trimetric resets to 100% SOC and zero amps in/out. This is the reset calibration that is necessary for accuracy going forward. Without it, the SOC and AH in/out readings would get progressively less accurate with every charge and discharge cycle.

The potential problem is that if the charger is not of a type that can consistently get the batteries to full charge, you will never get a reset unless you do it manually. If you do reset manually, and you don't have full batteries, you will set 100% SOC on batteries that are not there, so also be inaccurate.

We have discussed how folks do this with the PD chargers, and Marko has been able to get his working very well with the semi-manual setup. The PD chargers are good because you can reinitiate a charge cycle to get the batteries full so the Trimetric will reset and calibrate.

I would think there are many folks that never touch the Trimetric or reset it, as they aren't into the manual running of things. Nothing wrong with that, but if the charger isn't getting them fully charged regularly, they will be getting very poor readings of the actual SOC of their batteries, I think.

The newer generation of chargers we have seen lately, that do the transition from absorption to float based on amps as a % of charger capacity, are almost certain to leave most batteries undercharged or overcharged, unless they are the exact right right size for the charger and no loads are on, so those would be a minor improvement because you at least know when they will stop charging and could set the Trimetric amps setting higher to allow for it. Of course, it would reset to 100% when you were not at 100% full at that point.

Perhaps with the chargers that stop early, the Trimetric should be programmed to check the float voltage and amps(?) as the batteries will get "mostly" full after a long float?

I guess the question is--what is everyone seeing for resets with their monitors? Do you ever look at the amps on the Trimetric to see how much the batteries are taking? Do you ever look at the AH in/out on the Trimetric or always use the SOC display? Have you ever had an issue with the SOC not being what you expected, like running out of power early, or seeming to have more left than you thought you would? Has anyone used alternate settings in their monitor to make it work better with their charging system?

There is also the possibility that the resets are only happening after longer drives that could get the batteries all the way full. Has anyone noticed that happening?
__________________

booster is offline   Reply With Quote
Old 06-30-2016, 03:08 PM   #2
Site Team
 
avanti's Avatar
 
Join Date: Jul 2013
Posts: 3,131
Default

I have to admit that I am not anal on this topic. But, what I prefer to believe is that my modest solar charger and the fact that I park outside conspire to obviate this issue. I have no evidence to the contrary. If I am wrong, I don't want to hear about it.

IMO, this is the main reason to have some solar.
__________________

__________________
Formerly: 2005 Airstream Interstate (Sprinter 2500 T1N)
Now!: 2014 Great West Vans Legend SE (Sprinter 3500 NCV3 I4)
avanti is offline   Reply With Quote
Old 06-30-2016, 03:49 PM   #3
Platinum Member
 
markopolo's Avatar
 
Join Date: Oct 2006
Location: New Brunswick, Canada
Posts: 7,746
Default

My settings are (TM-2025):

P1: 14.3V
P2: 1A
P3: 390Ah

Those settings require both 14.3V or more and 1A or less flowing through the circuit to meet the "Charged" criteria and therefore auto reset.

It's been a while since I used the van to camp though so I'll try to remember to update this to note if I reach that target if off-grid for a few days.

I wonder if the Balmar SmartGauge is the same as the SmartGauge - SmartGauge Electronics - SmartGauge battery monitor - previously discussed here. Actually, it's probably better to spin that off to a different topic so Trimetric users can ignore it if not interested.
__________________
Two bikes on sliding cargo box: https://www.classbforum.com/forums/m...icture206.html & 1997 GMC Savana 6.5L Turbo Diesel Custom Camper Van Specifications: https://www.classbforum.com/forums/f...vana-5864.html
markopolo is offline   Reply With Quote
Old 06-30-2016, 05:36 PM   #4
Platinum Member
 
Join Date: Aug 2010
Location: Minnesota
Posts: 7,321
Default

I think a thread on the Smartgauge may be a good idea. I have gotten several questions about them in the last year. I don't know if the Balmar is the same or not, but that would be interesting to find out. The Smartgauge is not a normal battery monitor in that is does not measure current, as its only connection is a small wire to the positive terminal. It only gives a % SOC regardless of battery capacity (a benefit or detriment depending on how you look at it) based on internal algorithms, which must be based on voltage rate of change readings that are integrated over time to predict SOC loss. It would be very interesting to see if anyone has tried one, and compared to a regular shunt based monitor.
booster is offline   Reply With Quote
Old 06-30-2016, 05:38 PM   #5
Platinum Member
 
Join Date: Jul 2012
Posts: 2,237
Default

I believe it is the same device. Started a new thread on the Smartguage...
gregmchugh is offline   Reply With Quote
Old 07-02-2016, 05:01 PM   #6
Bronze Member
 
Join Date: Mar 2015
Posts: 39
Default

I have a trimetric and a 150ah lifeline. I have truecharge 60 which switches to float way too soon, at 6 amps instead of the required 0.75 amps. I get around this by switching the charger to gel and fooling it into thinking the battery is cold, this gives me 14.3 V which is good if the battery is 77F. The temp sensor is a resistance temperature device, so I added 2 10k pots in series so I can tweak the temperature and indirectly tweak the charge voltage.
The other way to get the trimetric reset to 100% is rebooting the charger, then it goes to full absorption voltage for a couple of minutes which is enough to reset the trimetric. Of course if I'm parked and it's sunny I can set up my 100W folding panel and get whatever voltage I want (when the battery is close to full).
I'm kind of fanatic about monitoring and logging the battery data.
I'm adding a 150W panel & trimetric charger so I shouldn't have to fool around with this as much in the near future.
papab is offline   Reply With Quote
Old 07-04-2016, 06:09 AM   #7
Bronze Member
 
briancummings's Avatar
 
Join Date: Feb 2016
Location: Red Deer, Alberta
Posts: 45
Default

1. P1 - 14.2
2. P2 - 08.
3. P3 – 220 (Amp Hour capacity of batteries)
4. P4 - A
5. P5 - OFF
6. P6 – OFF
7. P7 – L3
8. P10 – 97
9. P11 – Sh.H
10. P12 – ON
11. P13 – 10
12. P14 – 00.0
13. P15 – 30.2
14. P16 – 01.
15. P17 – 20
16. P18 – 13.1
17. P19 - FAC
briancummings is offline   Reply With Quote
Old 07-04-2016, 11:08 AM   #8
Platinum Member
 
Join Date: Aug 2010
Location: Minnesota
Posts: 7,321
Default

Quote:
Originally Posted by briancummings View Post
1. P1 - 14.2
2. P2 - 08.
3. P3 220 (Amp Hour capacity of batteries)
4. P4 - A
5. P5 - OFF
6. P6 OFF
7. P7 L3
8. P10 97
9. P11 Sh.H
10. P12 ON
11. P13 10
12. P14 00.0
13. P15 30.2
14. P16 01.
15. P17 20
16. P18 13.1
17. P19 - FAC
Thanks, Brian. Is P2 on your's in amps or %? 8 seems pretty high either way.
booster is offline   Reply With Quote
Old 07-04-2016, 07:20 PM   #9
Bronze Member
 
briancummings's Avatar
 
Join Date: Feb 2016
Location: Red Deer, Alberta
Posts: 45
Default

My rig is capable of producing close to 8 amps so I set it at 8 to allow for it. I have 300 watts of panels. I also have 3-130 AH Batteries controlled by a ProStar 30 and a Trimetric TR2025-RV
briancummings is offline   Reply With Quote
Old 07-04-2016, 08:11 PM   #10
Platinum Member
 
markopolo's Avatar
 
Join Date: Oct 2006
Location: New Brunswick, Canada
Posts: 7,746
Default

The amp flow in will decrease as the batteries get closer to full.
P2 at 8 amps is low criteria (easy) to reach.

Your settings require 14.2V and 8 amps or less to reach charged criteria.
It's unlikely that the batteries would be near full if for example 7 amps were still coming in.

I set mine to 14.3V and 1 amp or less. That's much greater criteria to reach. I can get there when plugged in but haven't confirmed getting there off-grid yet.
__________________

__________________
Two bikes on sliding cargo box: https://www.classbforum.com/forums/m...icture206.html & 1997 GMC Savana 6.5L Turbo Diesel Custom Camper Van Specifications: https://www.classbforum.com/forums/f...vana-5864.html
markopolo is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


» Featured Campgrounds

Reviews provided by

Powered by vBadvanced CMPS v3.2.3

All times are GMT. The time now is 01:40 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2019, vBulletin Solutions, Inc.