Sprinter-Forum    
 

Go Back   Sprinter-Forum > Sprinter-Based RV's & Conversions > Sprinter RV's & Conversions Talk

Sprinter RV's & Conversions Talk Common features found in Sprinter RV's and Conversions.


 
Thread Tools Display Modes
Old 02-13-2019, 03:27 AM   #61
PaulDavis
 
Join Date: Oct 2010
Location: Philadelphia, PA
Posts: 927
Thanks: 117
Thanked 392 Times in 230 Posts
Default Re: is there a solar charge controller that can do this?

That was mostly correct, except for one sort of important detail. The charge controller is using remote voltage sensing. Consequently, the voltage readings in the Tristar remote meter and the Trimetric are always in step (to the nearest 0.1V), and there is no discrepancy between them.

I agree with you that it is probably sensible for me to talk to Morningstar.
__________________
House sold; "Permanent" van life since Jan 7th 2019 | 2010 170 cargo NCV3 | my build thread | Wifely blog: Two people, 1 van, 2 bikes, lots of running shoes
PaulDavis is offline   Reply With Quote
Old 02-13-2019, 03:30 AM   #62
PaulDavis
 
Join Date: Oct 2010
Location: Philadelphia, PA
Posts: 927
Thanks: 117
Thanked 392 Times in 230 Posts
Default Re: is there a solar charge controller that can do this?

Quote:
Originally Posted by autostaretx View Post
Ummm... i just speed-read Paul's postings... i don't think he has ever said how many Amp-hours his battery pack is rated at?
510Ah

(2 x Lifeline 8D Concorde AGMs)
__________________
House sold; "Permanent" van life since Jan 7th 2019 | 2010 170 cargo NCV3 | my build thread | Wifely blog: Two people, 1 van, 2 bikes, lots of running shoes
PaulDavis is offline   Reply With Quote
Old 02-13-2019, 03:31 AM   #63
sprint2freedom
2008 NCV3 170ext
 
Join Date: Aug 2015
Posts: 1,325
Thanks: 808
Thanked 786 Times in 491 Posts
Default Re: is there a solar charge controller that can do this?

There's a nice comparison and discussion of several different charge controllers and their algorithms for switching from absorb to float in this blog post:
https://roadslesstraveled.us/solar-c...tery-charging/

The Morningstar controller is discussed about 2/3 of the way down the page:
https://roadslesstraveled.us/solar-c...ristar-mppt-60

Quote:
The Morningstar TriStar TS-MPPT-60 Solar Charge Controller multi-stage charging algorithm is the following:

BULK: Deliver the maximum amount of current possible until the batteries reach the Bulk voltage.

ABSORB: deliver as much current as necessary to keep the batteries at the Absorb voltage until the following thing happens:

2 to 2.5 hours has gone by (depending on battery type)

If the batteries fell below 12.5 volts during the previous night, then extend the Absorb stage by 30 minutes.

FLOAT: Deliver as much current as necessary to keep the batteries at the Float voltage. If the batteries are drawn down below the Float voltage for an hour or more due to big loads in the RV or boat (vacuum, power tools, microwave) or due to sudden cloud cover, the charge controller will switch back to Bulk mode and start the cycle over again. If the batteries fell below 12.3 volts during the previous night, then the solar charger will not enter the Float stage the following day.
Quote:
This is yet another creative approach to the various problems caused by the unreliability of sunshine. The idea of setting up the charging parameters today based on the lowest voltage the batteries reached overnight is cool, since that is truly the biggest determining factor for how much charging the batteries need right now.

However, note that there is no criteria for switching from Absorb to Float based on the current falling below a minimum value as with the other charge controllers. There is also no provision for lengthening the Absorb stage if the Absorb voltage can’t be maintained, although there is if the Float voltage can’t be maintained.
I haven't verified any of the statements made above against the controller manual, but if the OP is not in float, perhaps it's because the battery voltage fell below 12.3 the previous night. That, along with "no provision for lengthening the absorb stage" statement.. makes me think there might be an algorithmic trap of some kind-

In the bulk stage the controller is a constant-current source (limited by available sun). In the absorb stage it is a constant-voltage source. If the state diagram has no way of exiting absorb and/or does not react to a condition where the absorb voltage cannot be maintained, then it could remain in a constant-voltage mode even when the toaster is on. That's not necessarily a problem as it should still be trying to output its maximum current in order to raise the battery voltage to the absorb voltage, but if the bank was/is at a high SoC during this test then it's worth pointing out that the charge acceptance of AGMs is going to be limited even after dropping the SoC a couple percent with a toaster.

Last edited by sprint2freedom; 02-13-2019 at 03:54 AM.
sprint2freedom is offline   Reply With Quote
Old 02-16-2019, 01:03 AM   #64
autostaretx
Erratic Member
 
autostaretx's Avatar
 
Join Date: Sep 2006
Location: Seattle
Posts: 17,571
Thanks: 3,080
Thanked 7,945 Times in 5,793 Posts
Default Re: is there a solar charge controller that can do this?

From another thread, here is a charger than (A) accepts three charging sources (solar, shore, alternator) to feed (b) your choice of battery.
This charger *includes* shunt monitoring, so it DOES intelligently increase charging current if it sees a load being applied.
If it sees a load arrive, and solar can't supply the charger's 30 amp maximum, it will "add current" from one of the other sources.

The RedArc Manager30 BMS1230S2-NA.
Manual: https://www.redarc.com.au/Content/Im...n%20Manual.pdf

The Australian company's website https://www.redarc.com.au/ has a pop-up to their US site .. but the link is broken.

--dick
__________________
2005 T1N 118" Freightliner 2500 Passenger Wagon (2.7L, 15" tires, standard (short) roof)
Get YOUR Sprinter's full configuration datacard by entering your VIN to https://www.datamb.com/
http://diysprinter.co.uk/reference <-- lots of service documentation, Thanks to Jens Moller and Arnie_Oli
((as always: this post may go through a couple of post-posting edits... so maybe give it ten minutes before commenting))
autostaretx is offline   Reply With Quote
Old 02-16-2019, 05:31 AM   #65
elemental
 
Join Date: Jul 2017
Location: USA PNW
Posts: 361
Thanks: 154
Thanked 228 Times in 151 Posts
Default Re: is there a solar charge controller that can do this?

Quote:
Originally Posted by autostaretx View Post
The RedArc Manager30 BMS1230S2-NA.
Manual: https://www.redarc.com.au/Content/Im...n%20Manual.pdf

The Australian company's website https://www.redarc.com.au/ has a pop-up to their US site .. but the link is broken.

--dick
I have one (RedArc Manager30). The link to the US site is https://redarcelectronics.com/. The manual for the North American version of the product is here. I haven't finished integrating it into my system yet because it just became available in the US in January. They have been around in Australia a bit.
__________________
--
2017 Sprinter 2500 170 Crew OM642 5-speed auto with Adventure Wagon interior&MOAB
elemental is offline   Reply With Quote
The Following User Says Thank You to elemental For This Useful Post:
autostaretx (02-16-2019)
Old 02-26-2019, 07:09 PM   #66
elemental
 
Join Date: Jul 2017
Location: USA PNW
Posts: 361
Thanks: 154
Thanked 228 Times in 151 Posts
Default Re: is there a solar charge controller that can do this?

Quote:
Originally Posted by PaulDavis View Post
That was mostly correct, except for one sort of important detail. The charge controller is using remote voltage sensing. Consequently, the voltage readings in the Tristar remote meter and the Trimetric are always in step (to the nearest 0.1V), and there is no discrepancy between them.

I agree with you that it is probably sensible for me to talk to Morningstar.
Any news? I'm curious...
__________________
--
2017 Sprinter 2500 170 Crew OM642 5-speed auto with Adventure Wagon interior&MOAB
elemental is offline   Reply With Quote
Old 02-26-2019, 11:54 PM   #67
PaulDavis
 
Join Date: Oct 2010
Location: Philadelphia, PA
Posts: 927
Thanks: 117
Thanked 392 Times in 230 Posts
Default Re: is there a solar charge controller that can do this?

I didn't contact them (yet). I do plan to.

One interesting thing I did note (or maybe it's not interest, I dunno ....) ... most of the time the remote meter for the Tristar says that it is in "MPPT" mode. A couple of days ago, it was (unusually) in "Absorb" mode. In this mode, the charger seemed very responsive to actual loads on the system. I plugged in my laptop, turned on the inverter, and the charged immediately jumped up the watts it was delivering. However, very importantly, we're talking about much lower power situations - without the laptop, the charger was pulling about 15W from the panels, with the laptop it jumped up to 65W.

So it occurs to me that one reason for the behavior I am seeing is that I really am seeing the full power output of my panels (for whatever reason: dirt, solar incidence angle, time of year, wiring fault), and that the charger can't respond to loads either because (a) it is in MPPT mode (b) there is no more power (c) both.

I will get in touch with Morningstar and report back.
__________________
House sold; "Permanent" van life since Jan 7th 2019 | 2010 170 cargo NCV3 | my build thread | Wifely blog: Two people, 1 van, 2 bikes, lots of running shoes
PaulDavis is offline   Reply With Quote
The Following User Says Thank You to PaulDavis For This Useful Post:
elemental (02-28-2019)
Old 09-10-2019, 09:56 PM   #68
jbm-sd
 
Join Date: Mar 2017
Location: San Diego
Posts: 20
Thanks: 1
Thanked 7 Times in 4 Posts
Default Re: is there a solar charge controller that can do this?

I'm starting to look for a solar controller and read this entire thread. I'm interested as to whether or not you ever solved your issues with the Morningstar controller?

Thanks,
Jason
__________________
2016 144" WB Passenger Van I4 2WD
jbm-sd is offline   Reply With Quote
Old 09-18-2019, 03:31 AM   #69
redwoodcruiser
 
Join Date: Jun 2017
Location: San Diego
Posts: 20
Thanks: 4
Thanked 4 Times in 2 Posts
Default Re: is there a solar charge controller that can do this?

Jason-

I have one available in San Diego if you decide to go that route. See my ad here:

https://sandiego.craigslist.org/esd/...980697797.html

Thanks,

Kevin

P.S. mods if this shameless plug for my controller is not ok just let me know
__________________
2017 Mercedes Sprinter 4x4 170" WB cargo high top
redwoodcruiser is offline   Reply With Quote

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

Forum Jump



All times are GMT. The time now is 03:34 AM.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2019, vBulletin Solutions, Inc.