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Post by spiderbob on May 26, 2015 21:28:14 GMT -8
OK, so on the MPPT20 CC there is the temp light, where is the sensor located and how does it get temperature readings?
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Post by Admin on May 28, 2015 12:20:25 GMT -8
The temperature sensor is located next to the PV and BATT lights. That TEMP "light" is not a light, it is the actual sensor. In order to get a reading or to adjust the temperature compensation you would need to get the meter compatible with this controller.
-LP
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Post by spiderbob on May 29, 2015 6:43:32 GMT -8
OK, so I did get the remote but there is not a lot of explanation for this sensor. As I have the CC near the battery it is in the front compartment, so I assume it's getting the temp from this compartment. It is low in the trailer and always in the shade and/or dark, doesn't mean it don't get warm in the their during the summer, but as I said it is always shaded. What do you set this for? Perhaps I should add that the remote is routed to inside the trailer where I can keep an eye on things  Bob |
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Post by spiderbob on Jun 2, 2015 15:24:07 GMT -8
OK, no answer yet. What do you set the temp compensation coefficient for? I called interstate and they gave me ridiculous answer of 80 degrees. The settings go from 0 to 10.
This topic is not discussed in any manual. I do have the remote installed.
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Post by jsb2000 on Jun 2, 2015 16:59:57 GMT -8
OK, no answer yet. What do you set the temp compensation coefficient for? I called interstate and they gave me ridiculous answer of 80 degrees. The settings go from 0 to 10. This topic is not discussed in any manual. I do have the remote installed. Just a guess, but it's probably the number of mV/DegreeC per cell. I've read that standard lead acid batteries use a value of 3mV while others recommend 4mV. From a quick glance at the manual, the controller defaults to 5mV, which is right in the middle of your 0-10 available settings. |
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Post by spiderbob on Jun 2, 2015 20:20:55 GMT -8
Good evening:
Yes, I've read a lot about this the last few hours. But what I've read off the internet deals with water, salt, and other items not what I was hoping for. Interstate was no help either. Your answer is the best I've seen yet. But I'd really like to know what it affects in this set up of the MPPT and how the number comes about. What is it affecting if one selects the wrong value? I know, nothing is simple. I just need to know. But for lack of a better number I'll leave it at 5 for now. I do know that 0 shuts if off with no compensation coefficient whatever that means.
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Post by jsb2000 on Jun 3, 2015 6:34:40 GMT -8
As I understand it, the temperature compensation charges the battery at slightly different rates depending upon the temperature of the battery. For example, you don't want to dump a ton of current into a hot battery...nor do you want to trickle charge a cold battery. Efficient (and safe!) charging adjusts the charge rate based on the temperature of the battery.
As to what coefficient to choose? Honestly, I'm not sure. I'd have to do more research about it first.
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Post by spiderbob on Jun 3, 2015 8:15:33 GMT -8
Here is what I have found out so far, with no help from Renogy so far. The information I got from Interstate, is not all wrong. They gave me 80 degrees Fahrenheit is 25 degrees Celcius so, given the info on page 24 I assuming the Parameter is -30mV/C/12V. But where to go from here, I'm getting closer, I think. I just need to know how they use their scale on the remote from 0 - 10.
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Post by spiderbob on Jun 5, 2015 7:15:08 GMT -8
OK, so I spent 20 minutes on the phone with Interstate Battery. The 80 (25 celisus) degrees is correct information, but even they don't know how Renogy set up the perimeters for the "temp setting", nor do they understand it. They tell me to talk to the manufacture of the unit. Hmmmm, Renogy
Renogy, it's up to you to explain this?
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Post by jsb2000 on Jun 5, 2015 10:48:09 GMT -8
OK, so I spent 20 minutes on the phone with Interstate Battery. The 80 (25 celisus) degrees is correct information, but even they don't know how Renogy set up the perimeters for the "temp setting", nor do they understand it. They tell me to talk to the manufacture of the unit. Hmmmm, Renogy Renogy, it's up to you to explain this? Well, I'm not an employee of Renogy, but in lieu of a comment from them, I'd be happy to give you my opinion. Since you're using an Interstate brand battery, it's safe to say that 3mV per cell per degree C is the setting you want. I'm fairly confident that "3" is the one you want for that setting on the controller. 3mV is a conservative setting. Even if I'm wrong, it won't cause you any problems. Put it this way: The maximum I've ever seen is 5mV and many MPPT controllers select that as their default setting anyway. |
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Post by spiderbob on Jun 5, 2015 12:19:49 GMT -8
Thanks jsb, yes, that is what I have it set for, I somewhat came to the same conclusion, I'm glad that you confirm my feeling as well. Still wish I knew more about this setting. I have a feeling the Renogy techs can't add a lot to this either. I'm sure there is a lot of room for error. |
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