i have 100/20 controller which is not give any charging output when i connect with pv input. Then i was use power supply in pv terminal it gives zero voltage and current max, which means pv terminal shorted.
controller was working for more then 20days this is happens on 21st day.
i have checked in victron connect pv input max voltage is 95volt , pv max power is 270W.
What is the cause of short circuit in pv side. we face a lot of issue like this specially on 250volt MPPT.
I have also seen the pv short error when the battery has a voltage too high or it shut down.
https://www.victronenergy.com/live/mppt-error-codes#err_38_err_39_-_pv_input_shutdown
You do not mention the error number so I took a guess.
The usual cause for a short on the Mppt's PV input, is reverse polarity connection. Please confirm correct input polarity.
"we face a lot of issue like this specially on 250volt MPPT. " None of your previous questions relate to a 250v input Mppt. Who is we????
Thanks for your answer,
As i told before its working past 20 days, so there is no cause because of reverse polarity .If its reverse polarity it should happens first day.
But i already checked polarity all correct.
"Then i was use power supply in pv terminal it gives zero voltage and current max, which means pv terminal shorted. "
How are you determining max (PV) current? Are you using a separate meter? Or readings from the mppt?
Your max pv input voltage of 95v is a little close for comfort, seeing it is no longer mid winter in India.
maximum power is 270w so it never goes more than 20A. also from the panel we can expect more current.
Incase if i got more voltage or current victorn connect should gives over current or over voltage error.
As per the history in victorn connect No error found.
Misleading and evasive answers to proper fault-finding questions will only delay solutions to your problem.
Sorry cant get you ,what i need to explain or what i need to do let me know then i will do that.
As per your initial post.
"Then i was use power supply in pv terminal it gives zero voltage and current max, which means pv terminal shorted. " You are using a power supply, and not a solar pv array?
"controller was working for more then 20days this is happens on 21st day. " Working from a PV array, or a power supply ??
"i have checked in victron connect pv input max voltage is 95volt , pv max power is 270W. " Give details about your PV array/power supply.
"What is the cause of short circuit in pv side. " What measurements have you taken to support your claim that the input of the mppt is shorted?
1.You are using a power supply, and not a solar pv array?
ans: it was in site with PV input in 20 days , after found its not working i takeout from the site and test it in workshop with powersupply.
2.Working from a PV array, or a power supply ??
ans: PV array with 20 days
3.Give details about your PV array/power supply.
PV array ,open circuit voltage 97volt short circuit current : 3.82A
power supply voltage:0 to 35volt current : 5A
4.What measurements have you taken to support your claim that the input of the mppt is shorted?
ans:
I was using power supply as input in pvterminals. current minimized as 0.2Amps ,input voltage is given as 21V.
when i turn on power supply shows 0volt current 0.2AMps which result short in pv terminals.
Please Let me know if another details needed. Thanks for your time.
As per your reply to michelg..
Mppt error codes.. Re err 33/34....
It is probably best to cut your series array in half, and checks if your mppt powers up.
"I was using power supply as input in pvterminals. current minimized as 0.2Amps ,input voltage is given as 21V.when i turn on power supply shows 0volt current 0.2AMps which result short in pv terminals."
Half of my panels are used. Why buy new, when a good quality panel can be purchased for a 1/3 of new?
A check of the used panels Voc, and Isc has confirmed that the panel was per spec, and usable.
Please grab a multimeter, and check your array Voc, and Isc.
Thanks for your answer.
In victron connect there is error code (erorr33 and 34 ) available when there is over current and over voltage happens.in my case its not there that's why i wonder it may not be the reason. I also checked in victorn connect history maximum pv voltage and current it wont show any thing wrong.
Not only in this 100/20 controller i got this kind of fault in 250voltage controllers also.
Please correct me if i am wrong in above text. My apologies for all if its wrong.
hi, you have suspected a short at the input PV after 21 days where the controller was good and since is bad.. you have tested your input PV with a power supply trying to isolate PV or Mppt is failing and with your supply connected to PV input, the voltage fall to zero and current rise to max.. you know how to plug it (right polarity).. your check is a good way to isolate what is wrong..
you can to do those checks with a cheap digital multimeter (all wires disconnected.. so, no PV, no batt, no load connected).. short the input PV to avoid any voltage (as a charged capacitor) and do a continuity check between + and - of the PV input (red wire of DMM on + and black on -) and check if the DMM buz (or beep) and still beeping, the buzzer/coutinuity should be at 2000ohms scale.. if yes (the DMM buz and still buz.. not a buzuiiiii and nothing by a capacitor charging), go to minimal ohm scale (around 200 ohms scale) and check the value read (short PV input again before).. it’s not usual to read a value at this scale and in case of a reading < 5 ohms (wait few seconds to see if the value is rising by a capacitor), that look a dead short (check your connections if anything around can cause this).. if no short found with DMM but look short only when you apply your power supply (all normally connected, battery first), start your supply voltage at 0v and rise slowly until the voltage drop to zero (record this voltage trig point) and come back here with this value (i’m curious).. than may a voltage too high for your mppt (if ever > 100v in your case), a semiconductor or capacitor leakage triggering at this voltage value.. if you see a short with DMM (and contacts are clean), that may input capacitor or input mosfet or thermal isolation (of Mosfets) shorted.. in all of those cases (if less than 100v input) your mppt look dead and need to be returned or repaired.. i’m curious if it’s not a short but have a voltage trig level.. any supplemental details/data can help to find the problem..
Hi, seems that during 20 days the weather was not cold enough, and you were getting around 95VDC from the panels, but on the 21st day, if it has been a change in the weather, and getting a lower temperature, this could lead to have the panels producing more than 100VDC and destroying the MPPT. Amps can be managed, but voltage is a dead-end.
I think your MPPT is damaged by an over-voltage input from the PVs.
Michel
hi.. yes.. according to victron info, the voltage deviation is +0.34%/C under 25c.. that mean for 95voc at 25c = 0.323v/C or +5v if the PV in series are around 10c (15c colder x 0.323v/C = 4.85v).. always keep the extreme colder situation in your calculations.. me i never go over 80% of spec limits for to avoid any damages by stress..
