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Post by 1eyedjim on Oct 23, 2019 10:34:42 GMT
Hello
My 1st post in this group so nice to meet you all...
I've installed a 160w solar panel along with a Rover 20a MPPT. This is then connected to a 100ah Lithium battery. The manufacturer of the battery is stressing that the battery MUST be charged at 14.4v. I have set the MPPT Charge controller to lithium setting which has the 14.4v needed. However even on a sunny day like today the charger is not putting out the 14.4v as requested. Its currently in charge mode at a 13.2v output even though the panels are saying 15v+. I've double checked that the settings have been SET via the bluetooth app and they are.
Please help,
Regards
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raydas
Solar Devotee
Posts: 166
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Post by raydas on Oct 23, 2019 10:50:56 GMT
Out of curiosity, what is the battery reading, when you check it with a voltmeter, is it 13.2V or 14.4V. I have the Rover 20A MPPT that has the RS232-USB software, and I have noticed some inconsistencies in the program readings.
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Post by bupkis on Oct 23, 2019 11:59:04 GMT
there is no "charge mode". The controller should start the day in "MPPT" indicated on the middle left side of the controller.
MPPT = all solar power is used to charge the battery and slowly raise its voltage to 14.4v.
Mot sure about LI but I suspect once 14.4v in MPPT is reached the controller stops charging, anytime the battery drops below 13.2v the controller should go into MPPT mode and charge slowly raising the batt voltage to 14.4v.
ADMIN, What is the actual charge profile for LI? With no boost mode time or float what does the controller display when not charging?
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Post by tattoo on Oct 23, 2019 12:33:11 GMT
Plus you can't have a constant charge rate unless it's a totally cloudless day with no trees etc.......... A lot depends on the environment how your battery charges........
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Post by mediadogg on Oct 23, 2019 17:05:49 GMT
Hello My 1st post in this group so nice to meet you all... I've installed a 160w solar panel along with a Rover 20a MPPT. This is then connected to a 100ah Lithium battery. The manufacturer of the battery is stressing that the battery MUST be charged at 14.4v. I have set the MPPT Charge controller to lithium setting which has the 14.4v needed. However even on a sunny day like today the charger is not putting out the 14.4v as requested. Its currently in charge mode at a 13.2v output even though the panels are saying 15v+. I've double checked that the settings have been SET via the bluetooth app and they are. Please help, Regards Well +15V seems awfully low for a 160W panel. For example, one of the Renogy 160W panels has a Voc of about 22V and a Vmp of about 20v. To over simplify it, that says that if the panels are getting any sun at all, they will measue about 22V when not connected to anything. And if the MPPT controller is able to draw from the solar panel the required current in order to charge the battery in question, it will try to keep that panel hovering around 20V. So, 15V says to me that the panel is not getting anywhere near enough sun, so the MPPT controller, in an attempt to get enough power to charge the battery, is drawing more current than the panel can supply at 20V, so its voltage drops. So I would recommend: - confirm that the panel connections to the charge controller are solid - confirm that the panels are adequately "lit" by sunlight, and measure the panel voltage disconnected from the system - check to see what current is being supplied by the panels at the 15V you mentioned (or whatever voltage) - and at the same time, confirm what current is being delivered to the battery Once you get those numbers, some of the guys here (I'm not the best for that) can tell you whether those numbers are reasonable in a properly functioning system. |
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Post by Admin on Oct 23, 2019 18:37:53 GMT
Hello My 1st post in this group so nice to meet you all... I've installed a 160w solar panel along with a Rover 20a MPPT. This is then connected to a 100ah Lithium battery. The manufacturer of the battery is stressing that the battery MUST be charged at 14.4v. I have set the MPPT Charge controller to lithium setting which has the 14.4v needed. However even on a sunny day like today the charger is not putting out the 14.4v as requested. Its currently in charge mode at a 13.2v output even though the panels are saying 15v+. I've double checked that the settings have been SET via the bluetooth app and they are. Please help, Regards What is the battery voltage when nothing is connected to it? Depending on the state of charge of the controller you will be seeing different values. Have you tried running a load at the same time as charging and seeing if that changes the outcome? Did you measure your panel VOC and ISC prior to connecting it to the system? |
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