Did anybody tried Victron MPPT warranty?
After a few months of inactivity - disconnected from battery, loads and solar - it doesn't pass any current through. 20A model with Bluetooth. It's home now, on regulated DC supply. When connected ...
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Well, Don, it does behave weird.
Just to remind, this is a bench test with regulated 15A DC supply. I didn't pay attention to it in field, in summer.
It opens at 18.4V. I don't know why yesterday it opened at 15V - maybe it was after I cranked it up to 18, got scared that nominal 15V DC supply will blow up and lowered it to 15V. Once it opens, input can drop to 14.6V and it still pumps undetectable current, batter reads "On". Shuts down at 14.3V, says "goodnight", battery reads "Off" and won't wake up again until V input rises to 18.4.
When simulated "sun" goes down, controller is clinging to MPP curve very well. At 15V "evening" it outputs 6A, at 14.5V - 0.1 A (heavy rain?), and if "rain" stops and V input rises to 15 again, it outputs mere 0.2A - not 6A. Then it wakes "for real" at ~16V, at which point current jumps to 10A and V drops to 15-something - MPP tracking at work, but not as smooth as in the "evening".
Reached Absorb at 14.6V - as per my setting. Current tapered to zero. I pulled the plug, then decided to let Li batt fry a little more, plugged DC supply in - nothing. With charger disconnected and zero load my Li reads 14.3V fully charged, this isn't new, it drops by 0.3V from 14.6 observed at the end Absorb. Cranked input up to 18.5V - nothing. Isn't it supposed to re-start Bulk again, quickly rise to 14.6 and go to Float? My "Re-bulk" is set at 0.1V, this means it should start Bulk again if V drops to 14.5.
Somebody with Victron MPPT, please enlighten me. Maybe it's normal not to open until sun gets high and V input =18.5, and not to at least "try" to resume charging at 14.3 after 14.6 Absorb has been reached.
Just to remind, this is a bench test with regulated 15A DC supply. I didn't pay attention to it in field, in summer.
It opens at 18.4V. I don't know why yesterday it opened at 15V - maybe it was after I cranked it up to 18, got scared that nominal 15V DC supply will blow up and lowered it to 15V. Once it opens, input can drop to 14.6V and it still pumps undetectable current, batter reads "On". Shuts down at 14.3V, says "goodnight", battery reads "Off" and won't wake up again until V input rises to 18.4.
When simulated "sun" goes down, controller is clinging to MPP curve very well. At 15V "evening" it outputs 6A, at 14.5V - 0.1 A (heavy rain?), and if "rain" stops and V input rises to 15 again, it outputs mere 0.2A - not 6A. Then it wakes "for real" at ~16V, at which point current jumps to 10A and V drops to 15-something - MPP tracking at work, but not as smooth as in the "evening".
Reached Absorb at 14.6V - as per my setting. Current tapered to zero. I pulled the plug, then decided to let Li batt fry a little more, plugged DC supply in - nothing. With charger disconnected and zero load my Li reads 14.3V fully charged, this isn't new, it drops by 0.3V from 14.6 observed at the end Absorb. Cranked input up to 18.5V - nothing. Isn't it supposed to re-start Bulk again, quickly rise to 14.6 and go to Float? My "Re-bulk" is set at 0.1V, this means it should start Bulk again if V drops to 14.5.
Somebody with Victron MPPT, please enlighten me. Maybe it's normal not to open until sun gets high and V input =18.5, and not to at least "try" to resume charging at 14.3 after 14.6 Absorb has been reached.
