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Post by Admin on Nov 5, 2018 16:44:06 GMT
I'm running a Renogy Rover 40A controller currently. I checked the battery voltage with my meter and it's .20-.25v higher than what the CC is reporting. With it currently i boost mode the CC says 14.8V and my meter shows 15.00-15.05v. Don't recall actually checking the battery voltage when the CC was charging before. Is there a reason for this? Something wrong with the CC? With TempComp it could be higher as it's currently reporting 5C for battery temp but that doesn't give a reason for the CC reporting the wrong battery voltage. The function of your controller seems to be normal. There will be certain accuracy/inaccuracies percentages in the reporting of the voltage due to line loss, temperature compensation, the measuring equipment and also that the controller reports the digits to the tenths decimal place. However, the overall charge controller function is not affected by the reported measurements percentages and has been tested to accurately charge your battery. -Renogy Team
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Post by bupkis on Nov 5, 2018 17:21:22 GMT
I'm running a Renogy Rover 40A controller currently. I checked the battery voltage with my meter and it's .20-.25v higher than what the CC is reporting. With it currently i boost mode the CC says 14.8V and my meter shows 15.00-15.05v. Don't recall actually checking the battery voltage when the CC was charging before. Is there a reason for this? Something wrong with the CC? With TempComp it could be higher as it's currently reporting 5C for battery temp but that doesn't give a reason for the CC reporting the wrong battery voltage. The function of your controller seems to be normal. There will be certain accuracy/inaccuracies percentages in the reporting of the voltage due to line loss, temperature compensation, the measuring equipment and also that the controller reports the digits to the tenths decimal place. However, the overall charge controller function is not affected by the reported measurements percentages and has been tested to accurately charge your battery. -Renogy Team Dearest Renogy Team/admin That seems to be mumbo jumbo. The question of concern is does the battery voltage readout supposed to be battery voltage as supported by the manual or some 'target' voltage suggested by the OP?
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Post by Admin on Nov 5, 2018 17:46:56 GMT
The function of your controller seems to be normal. There will be certain accuracy/inaccuracies percentages in the reporting of the voltage due to line loss, temperature compensation, the measuring equipment and also that the controller reports the digits to the tenths decimal place. However, the overall charge controller function is not affected by the reported measurements percentages and has been tested to accurately charge your battery. -Renogy Team Dearest Renogy Team/admin That seems to be mumbo jumbo. The question of concern is does the battery voltage readout supposed to be battery voltage as supported by the manual or some 'target' voltage suggested by the OP? It should be the actual battery voltage. Do the values change with and without the temperature sensor? -Renogy Team
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Post by tattoo on Nov 5, 2018 17:54:25 GMT
Time of day and charge mode doesn't affect the discrepancy. That wasn't my question.... What is your voltage first thing in the morning..... It can't be 14 something that you keep saying it is...
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Post by tattoo on Nov 5, 2018 17:56:18 GMT
When I looked at the temp comp charging for the batteries the actual battery voltage is correct for the current temp. That's what I said above I'd bet that the CC is adjusting for the temp.,....
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Post by bupkis on Nov 5, 2018 18:04:05 GMT
Dearest Renogy Team/admin That seems to be mumbo jumbo. The question of concern is does the battery voltage readout supposed to be battery voltage as supported by the manual or some 'target' voltage suggested by the OP? It should be the actual battery voltage. Do the values change with and without the temperature sensor? -Renogy Team Thank you, the OP does not believe his CC readout can be 2% low.
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Post by playersz28 on Nov 5, 2018 18:35:52 GMT
When I looked at the temp comp charging for the batteries the actual battery voltage is correct for the current temp. where did you look? coincidence, yes your CC is off by that much. Calc'd it from the 4mv & current temp to get the offset which is pretty much the diff between actual batt voltage and reported batt voltage. I didn't check if the Tracer did the same thing. Does anybody else have a difference between reported voltage and actual?
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Post by playersz28 on Nov 5, 2018 18:37:58 GMT
Time of day and charge mode doesn't affect the discrepancy. That wasn't my question.... What is your voltage first thing in the morning..... It can't be 14 something that you keep saying it is... I never said it was 14 in the morning. The numbers I'm talking about are when it's charging. I haven't checked the numbers when it's dark and not charging.
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Post by playersz28 on Nov 5, 2018 18:42:19 GMT
The function of your controller seems to be normal. There will be certain accuracy/inaccuracies percentages in the reporting of the voltage due to line loss, temperature compensation, the measuring equipment and also that the controller reports the digits to the tenths decimal place. However, the overall charge controller function is not affected by the reported measurements percentages and has been tested to accurately charge your battery. -Renogy Team Dearest Renogy Team/admin That seems to be mumbo jumbo. The question of concern is does the battery voltage readout supposed to be battery voltage as supported by the manual or some 'target' voltage suggested by the OP? Sounds like an answer produced by a politician LOL Line Loss - no, measured at the CC output terminals with DVM TempComp - maybe, but my point is that the CC reports something it calls "battery voltage" which is not the true voltage Accuracy - my DVM is showing to 100ths of a volt. The CC shows 10ths. Can't be off by .25-.30v by rounding I log the data from the CC. My point is that I can't use it as it's not correct. Logging 14.8v is not the same as 15.05v
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Post by playersz28 on Nov 5, 2018 18:51:39 GMT
I disconnected the temp sensor and the reported temp went to 25C which would mean no comp. There is still a 0.25v discrepancy between reported and actual voltage. I then disconnected the panels so there was no charging (in float mode anyway). Still had the difference and the CC was reporting that the panel voltage is 0.3v when nothing there.
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Post by tattoo on Nov 5, 2018 20:34:18 GMT
That wasn't my question.... What is your voltage first thing in the morning..... It can't be 14 something that you keep saying it is... I never said it was 14 in the morning. The numbers I'm talking about are when it's charging. I haven't checked the numbers when it's dark and not charging. I know you didn't say it was 14 and neither did I, but that's the only numbers you have given.... Why haven't you checked the voltage in the AM that's very important..... Plus you can also see if the CC is correct at rest.....
Just checking one thing the same time everyday isn't a good way to see where and if there is a problem at all.....See what I'm saying...
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Post by bupkis on Nov 5, 2018 20:40:06 GMT
I disconnected the temp sensor and the reported temp went to 25C which would mean no comp. There is still a 0.25v discrepancy between reported and actual voltage. I then disconnected the panels so there was no charging (in float mode anyway). Still had the difference and the CC was reporting that the panel voltage is 0.3v when nothing there. so the panel V is OFF also!
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Post by playersz28 on Nov 5, 2018 21:57:47 GMT
I never said it was 14 in the morning. The numbers I'm talking about are when it's charging. I haven't checked the numbers when it's dark and not charging. I know you didn't say it was 14 and neither did I, but that's the only numbers you have given.... Why haven't you checked the voltage in the AM that's very important..... Plus you can also see if the CC is correct at rest.....
Just checking one thing the same time everyday isn't a good way to see where and if there is a problem at all.....See what I'm saying... I'll check it in the morning but I'm not concerned about what the ACTUAL voltage is. My issue is that whatever the CC reports, at any time of day that I have checked so far and in any mode that it's running in..... the reported battery voltage is incorrect.
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Post by playersz28 on Nov 5, 2018 22:01:08 GMT
I disconnected the temp sensor and the reported temp went to 25C which would mean no comp. There is still a 0.25v discrepancy between reported and actual voltage. I then disconnected the panels so there was no charging (in float mode anyway). Still had the difference and the CC was reporting that the panel voltage is 0.3v when nothing there. so the panel V is OFF also! Yeah, maybe that's where the missing 0.3v went. LOL The whole point of this is that if the CC is going to report data and the data is wrong what is the use of having the data? I can only easily check the batt voltage. Maybe the current being reported is wrong too but I'd have to insert the meter to check that although I can see what the DROK meter shows for charge current but I don't know how accurate that is. I know my DVM is right.
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Post by tattoo on Nov 5, 2018 22:05:32 GMT
I'll check it in the morning but I'm not concerned about what the ACTUAL voltage is. My issue is that whatever the CC reports, at any time of day that I have checked so far and in any mode that it's running in..... the reported battery voltage is incorrect. But you are concerned what the a ACTUAL voltage is... If you weren't you wouldn't be looking at it...
But that's neither here nor there.... Let us know what the CC says the voltage is and what your meter says it is in the AM..... I believe it will tell you way more than you think it will...
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