Help in understanding the data from my MT50 meter?

novaopnovaop Registered Users Posts: 9 ✭✭


I'm looking for help in deciphering/understanding the data presented in the posted image. 
I understand that the Left most icon is info for the solar panel.  The battery is the battery.  The "light" icon deals with load. 

It's the numbers-  I'm trying to gain a better understanding of what these mean exactly in regards to the system....What is the example posted saying about what is going on with the system?  THANKS SO MUCH!
3 - 100 watt Renogy panels in a series.
40A CC MPPT Controller
MT50 Trace Meter
1000 watt pure sine wave inverter
200AH AMG Battery (Renogy)

Comments

  • Raj174Raj174 Solar Expert Posts: 461 ✭✭✭✭
    Welcome to the forum novaop,
    It is saying that the battery is full and you have no load on the battery. 
    The PV input is determined by the battery.  37.2 x 1.1 = 40.92 divided by battery voltage 14.4 = 2.9 amps

    Rick
    12 x 300W Renogy PV, MNE175DR-TR epanel modified, MN Classic 150, Outback Radian GS4048A, Mate3, 51.2V 195AH HI Power LiFePO4 no BMS, 4000W gen.
  • novaopnovaop Registered Users Posts: 9 ✭✭
    Raj174 said:
    Welcome to the forum novaop,
    It is saying that the battery is full and you have no load on the battery. 
    The PV input is determined by the battery.  37.2 x 1.1 = 40.92 divided by battery voltage 14.4 = 2.9 amps

    Rick
    Thanks.  I've been browsing it for awhile and have seen a lot of helpful stuff.  I created an acct. today to help me learn more about all this solar stuff.  Just installed my system and I'm trying to learn and increase my understanding.  Here's a specific question:  The "load" icon : what does it mean when the little lines around the icon disappear/reappear?  

    3 - 100 watt Renogy panels in a series.
    40A CC MPPT Controller
    MT50 Trace Meter
    1000 watt pure sine wave inverter
    200AH AMG Battery (Renogy)
  • novaopnovaop Registered Users Posts: 9 ✭✭
    In regards to the solar - do the numbers under there represent only the power that's being provided to the battery?  In other words they are not representative of the full power possible from the panels.  So as the battery is drawn down the numbers would increase?
    3 - 100 watt Renogy panels in a series.
    40A CC MPPT Controller
    MT50 Trace Meter
    1000 watt pure sine wave inverter
    200AH AMG Battery (Renogy)
  • novaopnovaop Registered Users Posts: 9 ✭✭
    edited November 2 #5
    What is the 2.9amps??  Is that how much is going into the battery?  Or is that what is available in the battery?  I'm very new to all of this and while I've been reading a lot....so far the light bulb of comprehension is not going on...only flickering. 
    3 - 100 watt Renogy panels in a series.
    40A CC MPPT Controller
    MT50 Trace Meter
    1000 watt pure sine wave inverter
    200AH AMG Battery (Renogy)
  • novaopnovaop Registered Users Posts: 9 ✭✭
    edited November 2 #6
    Ok....I've been playing around with my system and making a note of the numbers showing up on the meter.  So when I turn on everything drawing power inside my camper.... the PV amps go up & so does the amps under the battery.  Nothing happens under the load icon...no change.  I thought the load icon was supposed to indicate the load....from things being turned on and using electricity.  Is this not the case?

    I'd like to add that the battery is showing fully charged and the sun is out while I'm doing this.



    3 - 100 watt Renogy panels in a series.
    40A CC MPPT Controller
    MT50 Trace Meter
    1000 watt pure sine wave inverter
    200AH AMG Battery (Renogy)
  • littleharbor2littleharbor2 Solar Expert Posts: 683 ✭✭✭✭
    edited November 3 #7
    The load icon is strictly for what may be connected to the load output terminals on the charge controller. It appears you don't have anything connected to those terminals. Best to leave it that way. If  you must, connect only a low current item (such as a led light) which may be turned on and off by settings on the controller.

    2.1 Kw Suntech 175 mono, Classic 200, Trace SW 4024 ( 15 years old  but brand new out of sealed factory box Jan. 2015), Bogart Tri-metric, 700 ah @24 volt AGM battery bank. Plenty of Baja Sea of Cortez sunshine.

  • mcgivormcgivor Registered Users Posts: 1,281 ✭✭✭✭
    The 2.9A is what's going into the battery at 14.4V, the PV is producing 37.2V at 1.1A which is down converted to the battery charging voltage, there is no load, hense 0.0A,  the voltage at load terminals is 14.5V, which is strange because it's higher than battery voltage but not something to be overly concerned with, it's just a rough indication. As loads are applied the PV will attempt to support the loads resulting in the amperage increase indicated, if the loads are greater than the PV's ability to support them, current will be withdrawn from the battery, when loads are turned off, the amperage will remain higher, tapering down as the battery approaches full charge. The load terminals should only be used for small loads, any larger loads should be connected directly to the battery via an overcurrent device, fuse or breaker, higher end controller's  do not have load terminals such as these 
      1500W, 6× Schutten 250W Poly panels , Schneider 150 60 CC, Schneider SW 2524 inverter, 8×T105 GC 24V nominal 

  • novaopnovaop Registered Users Posts: 9 ✭✭
    The load icon is strictly for what may be connected to the load output terminals on the charge controller. It appears you don't have anything connected to those terminals. Best to leave it that way. If  you must, connect only a low current item (such as a led light) which may be turned on and off by settings on the controller.the controller.
    OK...that's what I thought but it's been surprisingly difficult to find CLARITY in figuring out this stuff.  The "manuals" that came with this stuff are sooooo basic and don't really explain the who, what, when, where's of each of the numbers.    The manual makes it seem as though the little dashes appearing around the bulb mean it's ON.  On my display these go on and off at times?  Why is that?  Also it has occasionally shown .1A under the load icon.  You are correct....I have nothing connected to the Load output terminals on the controller.
    3 - 100 watt Renogy panels in a series.
    40A CC MPPT Controller
    MT50 Trace Meter
    1000 watt pure sine wave inverter
    200AH AMG Battery (Renogy)
  • Spence_McCallieSpence_McCallie Registered Users Posts: 9 ✭✭
    Littleharbor2 is right. The load icon is for another set of contacts on your charge controller. Usually, you can program the load contacts to perform a specific function. The most common is to wire a set of lights to the load contact and have the controller turn the lights on at dusk.

    Most of us don't use the load contacts anyway, so don't worry about it.
    Denver Area
    Off Grid: 1.2kW, 48V, Midnite Kid, Grundfos SQFlex
    Industrial design and automation.
  • novaopnovaop Registered Users Posts: 9 ✭✭
    Thanks to those who've responded thus far.  Things are starting to make more sense now.  This is my first time using solar and I want to be sure I understand what these numbers are telling me.  Another question....When there IS a load at night (no charging going on) (say I turn on some lights and fans) - then should I see a negative number on the amps under the battery?  (showing amps being drawn?)
    3 - 100 watt Renogy panels in a series.
    40A CC MPPT Controller
    MT50 Trace Meter
    1000 watt pure sine wave inverter
    200AH AMG Battery (Renogy)
  • novaopnovaop Registered Users Posts: 9 ✭✭
    edited November 3 #12
    Another observation/question.....  I've noticed that the battery icon that is supposed to indicate the charge level does not seem to jive with reality.  For instance....after the sun goes down this icon almost immediately drops to show HALF of full charge...even with zero draw - nothing turned on inside my camper.  This freaked me out a bit when I saw it happen.......however the volts under the battery show it as 12.9, which I think is indicative of a full charge.   Any thoughts???  Thanks.
    3 - 100 watt Renogy panels in a series.
    40A CC MPPT Controller
    MT50 Trace Meter
    1000 watt pure sine wave inverter
    200AH AMG Battery (Renogy)
  • Raj174Raj174 Solar Expert Posts: 461 ✭✭✭✭
    novaop said:
    Another observation/question.....  I've noticed that the battery icon that is supposed to indicate the charge level does not seem to jive with reality.  For instance....after the sun goes down this icon almost immediately drops to show HALF of full charge...even with zero draw - nothing turned on inside my camper.  This freaked me out a bit when I saw it happen.......however the volts under the battery show it as 12.9, which I think is indicative of a full charge.   Any thoughts???  Thanks.
    12.9 is the voltage reading of battery as it approaches resting voltage. It could take a couple of hours to reach final resting voltage. Something like 12.7
    12 x 300W Renogy PV, MNE175DR-TR epanel modified, MN Classic 150, Outback Radian GS4048A, Mate3, 51.2V 195AH HI Power LiFePO4 no BMS, 4000W gen.
  • Raj174Raj174 Solar Expert Posts: 461 ✭✭✭✭
    edited November 3 #14
    novaop said:
    Thanks to those who've responded thus far.  Things are starting to make more sense now.  This is my first time using solar and I want to be sure I understand what these numbers are telling me.  Another question....When there IS a load at night (no charging going on) (say I turn on some lights and fans) - then should I see a negative number on the amps under the battery?  (showing amps being drawn?)
    It will not read negative reading because the MT50 is a charge controller remote, and only displays PV and charging information. However, the battery voltage will drop as loads are applied. If you want to see amp readings for loads you'll need a separate amp meter installed for that purpose.

    Rick
    12 x 300W Renogy PV, MNE175DR-TR epanel modified, MN Classic 150, Outback Radian GS4048A, Mate3, 51.2V 195AH HI Power LiFePO4 no BMS, 4000W gen.
  • mcgivormcgivor Registered Users Posts: 1,281 ✭✭✭✭
    novaop said:
    Another observation/question.....  I've noticed that the battery icon that is supposed to indicate the charge level does not seem to jive with reality.  For instance....after the sun goes down this icon almost immediately drops to show HALF of full charge...even with zero draw - nothing turned on inside my camper.  This freaked me out a bit when I saw it happen.......however the volts under the battery show it as 12.9, which I think is indicative of a full charge.   Any thoughts???  Thanks.
    The battery icon is an indication of state of charge, whilst charging , not battery capacity indicator, or fuel gauge if you like, when the PV  is charging and reaches ~14.4V the icon will be at or near to full, as soon as PV voltage drops below the battery voltage the display will appear to indicate loss of capacity, but it actually indicating a loss of voltage, a little misleading, having a real battery capacity meter would require knowing how much capacity was withdrawn verses how much is replaced......I wonder if the smiley face changes to  :( when the battery is completely dead?
      1500W, 6× Schutten 250W Poly panels , Schneider 150 60 CC, Schneider SW 2524 inverter, 8×T105 GC 24V nominal 

  • littleharbor2littleharbor2 Solar Expert Posts: 683 ✭✭✭✭
    mcgivor said

    I wonder if the smiley face changes to  :( when the battery is completely dead?
    It does.

    2.1 Kw Suntech 175 mono, Classic 200, Trace SW 4024 ( 15 years old  but brand new out of sealed factory box Jan. 2015), Bogart Tri-metric, 700 ah @24 volt AGM battery bank. Plenty of Baja Sea of Cortez sunshine.

  • fratermusfratermus Registered Users Posts: 14 ✭✭
    novaop said:
    Another observation/question.....  I've noticed that the battery icon that is supposed to indicate the charge level does not seem to jive with reality. 
    The battery icon is infamously devoid of useful information.  I advise ignoring it.
    2017 Promaster 159" DIY camper
    570W mono / 220AH GC
  • fratermusfratermus Registered Users Posts: 14 ✭✭
    Raj174 said:
    It will not read negative reading because the MT50 is a charge controller remote, and only displays PV and charging information. However, the battery voltage will drop as loads are applied. If you want to see amp readings for loads you'll need a separate amp meter installed for that purpose.
    It really will show Amps going out the LOAD outputs.
    2017 Promaster 159" DIY camper
    570W mono / 220AH GC
  • fratermusfratermus Registered Users Posts: 14 ✭✭
    The load icon is for another set of contacts on your charge controller. Usually, you can program the load contacts to perform a specific function.
    ...
    Most of us don't use the load contacts anyway, so don't worry about it.
    I use my LOAD output to power house loads;  this allows controller's low voltage disconnect to cut power at 12.2v or whatever. Since my loads can exceed the rating of the controller I run a relay off it, then run the actual loads through that.
    2017 Promaster 159" DIY camper
    570W mono / 220AH GC
  • novaopnovaop Registered Users Posts: 9 ✭✭
    Thanks to all!!    I'm gaining a much better understanding of what the meter is all about.  I'm no longer freaking out.  :smile:
    3 - 100 watt Renogy panels in a series.
    40A CC MPPT Controller
    MT50 Trace Meter
    1000 watt pure sine wave inverter
    200AH AMG Battery (Renogy)
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