Hello am having issues with my system, I have 18 panels each 290W wired in strings of 3 panels in series making 6 strings connected to a victron MPPT through a combiner box, at night the MMPT reads a very high PV voltage higher than the batteries yet there is no light, this affects the charge cycle of the MPPT so I never get absorption time at all, what could be the problem20200204_082603.jpg
Victron MPPT, high Voltage reading at night, not reaching absorb during day
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Victron MPPT, high Voltage reading at night, not reaching absorb during day
Last edited by mlsadler; 02-04-2020, 01:38 AM. -
What is the voltage the panels. I need the Voc and the Vmp number from the sticker on the back of the panel.
Voc is the Voltage Open Circuit when the panels are connected to the controller, but not producing power early morning and late evening.
Vmp is the Voltage Max Power for noon time charging
And what is the maximum allowable PV input voltage for your charge controller ?Powerfab top of pole PV mount (2) | Listeroid 6/1 w/st5 gen head | XW6048 inverter/chgr | Iota 48V/15A charger | Morningstar 60A MPPT | 48V, 800A NiFe Battery (in series)| 15, Evergreen 205w "12V" PV array on pole | Midnight ePanel | Grundfos 10 SO5-9 with 3 wire Franklin Electric motor (1/2hp 240V 1ph ) on a timer for 3 hr noontime run - Runs off PV ||
|| Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
|| VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A
solar: http://tinyurl.com/LMR-Solar
gen: http://tinyurl.com/LMR-Lister -
The solar panel specs
Brand Solarworld
Voc 39.9V
Isc 9.97A
Vmpp 31.4V
Impp 9.33A
The solar MPPT specs
Brand Victron 150/85
Voltage 150V max and current 85A max
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What is the battery system voltage you trying to charger?
With an MPPT CC, 5220 watts ( 18 x 290w = 5220w) is high even for a 48volt system. That 5220w can generate more than the 85amp out rating of that CC. (5220w / 48v = 108.75amps).
Chances are your CC may be having issues do the work you expect out of it.Comment
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My biggest question is why does the MPPT read high PV voltages upto even 60V in the night while there is no sunshine, the problem that causes is that the MPPT never goes off at night so we get no absorption time the next day otherwise it charges well never has it even ever reached the maximum of the panel power the highest we have ever registered is 4300W, anyway the batteries are 48V 600AhComment
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My biggest question is why does the MPPT read high PV voltages upto even 60V in the night while there is no sunshine, the problem that causes is that the MPPT never goes off at night so we get no absorption time the next day otherwise it charges well never has it even ever reached the maximum of the panel power the highest we have ever registered is 4300W, anyway the batteries are 48V 600Ah
My 12V system shows over 13.5v after the sun goes down but it comes down by morning.Comment
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