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Post by playersz28 on Nov 4, 2018 16:16:07 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.
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Post by bupkis on Nov 4, 2018 17:50:07 GMT
temp correction (-3mV/°C/2V (default)) @5c is +.36v
having mismatch measurements is always a problem, which one is correct, are any correct?
I hope it is not to much to worry about but you could create a USER battery profile and make adjustments.
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Post by tattoo on Nov 4, 2018 19:30:21 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. I wouldn't worry about it... The only one I would worry about is the one that your meter shows....
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Post by playersz28 on Nov 4, 2018 20:52:19 GMT
If the CC is going to report a battery voltage it should at least be the actual number and not it's target number. I see that the Temp comp is in there but it's showing the batt volts as pre-comp rather than actual. That means that the voltage on the LCD and phone app is bogus.
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Post by tattoo on Nov 4, 2018 21:00:00 GMT
If the CC is going to report a battery voltage it should at least be the actual number and not it's target number. I see that the Temp comp is in there but it's showing the batt volts as pre-comp rather than actual. That means that the voltage on the LCD and phone app is bogus. Yep it's more than likely bogus or just close...... But with that said my voltage is up and down all the time because of charging and my 24/7 draw so close is good enough for me.... The only thing that I really worry or care about is what my voltage is first thing in the AM.....
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Post by bupkis on Nov 4, 2018 22:24:23 GMT
If the CC is going to report a battery voltage it should at least be the actual number and not it's target number. I see that the Temp comp is in there but it's showing the batt volts as pre-comp rather than actual. That means that the voltage on the LCD and phone app is bogus. It does not report target voltage, it reports actual voltage but it could be off and/or your voltmeter may be off. if full river wants 14.7 and you are using 14.4 but actually getting 14.7 then celebrate!(this assumes the CC is off and your voltmeter is dead ON!)
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Post by tattoo on Nov 4, 2018 23:17:51 GMT
Yes sir what the voltmeter says is all that matters......
I have a digital volt display that is usually dead on what the voltage actually is...
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Post by playersz28 on Nov 4, 2018 23:32:35 GMT
No draw on the system (RV). Three meters all give the same battery voltage (they're right). Rover display and BT connected app both show 14.8v
Means that in order to know a true battery voltage from the data feed out of the Rover I need to calc it using the voltage reported and adding in temp comp
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Post by tattoo on Nov 5, 2018 0:33:49 GMT
Means that in order to know a true battery voltage from the data feed out of the Rover I need to calc it using the voltage reported and adding in temp comp Yes sir that makes sense.... I'm sure that's what the CC is trying to do.... I would like to know what the Admin has to say about what the CC is doing?
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Post by bupkis on Nov 5, 2018 0:44:19 GMT
No draw on the system (RV). Three meters all give the same battery voltage (they're right). Rover display and BT connected app both show 14.8v Means that in order to know a true battery voltage from the data feed out of the Rover I need to calc it using the voltage reported and adding in temp comp No, the data feed should be battery voltage as measured by the CC, yes it could be inaccurate what three meters? the CC only has one for battery voltage and the BT uses that data.
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Post by playersz28 on Nov 5, 2018 14:05:04 GMT
No draw on the system (RV). Three meters all give the same battery voltage (they're right). Rover display and BT connected app both show 14.8v Means that in order to know a true battery voltage from the data feed out of the Rover I need to calc it using the voltage reported and adding in temp comp No, the data feed should be battery voltage as measured by the CC, yes it could be inaccurate what three meters? the CC only has one for battery voltage and the BT uses that data. I have 2 digital meters installed in the RV plus my DVM. The 14.8v being reported isn't what the Rover is measuring off the battery, it couldn't be that inaccurate.
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Post by bupkis on Nov 5, 2018 14:26:07 GMT
What is it measuring? I do not follow your logic.
What about earlier in the day during BULK, when the battery has not reached max voltage, what is the CC measuring and what is the difference with all these meters if any?
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Post by tattoo on Nov 5, 2018 14:53:40 GMT
What is the voltage first thing in the AM with all the meter devices....
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Post by playersz28 on Nov 5, 2018 16:12:44 GMT
Time of day and charge mode doesn't affect the discrepancy. It seems to be that the mismatch between what the Rover displays on the LCD & reports to the BT app vs what the actual battery voltage measures is pretty much the temp comp value. I just measured directly on the Rover battery terminals with a DVM and the got 14.32 vs 14.1 on the LCD. The 14.1 might be rounded so no way to know what the number is to 2 dec places. This means that the number that is provided by the CC, either on the display or over the data port, can't be used as the actual battery voltage.
When I looked at the temp comp charging for the batteries the actual battery voltage is correct for the current temp.
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Post by bupkis on Nov 5, 2018 16:25:12 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.
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