knexbuilder
New Member
- Joined
- Jul 1, 2022
- Messages
- 60
So I just installed a couple of Schneider Inverters and matching MPPTs. Well actually only one MPPT is hooked up at the moment. I needed one more breaker to install the second one. Anyway, put the system into service late Saturday afternoon (5/8/23) and was more than impressed. It handled everything I threw at it and asked for more. I was generating power from my panels; life was good. Did more testing Sunday, again all is well.
Today I get back home from work and check on the system and notice that the battery voltage is low (53V) and should be getting charged from the solar panels. The MPPT controller was indicating it was connected to the battery, but that no charging was taking place. I went into the settings and investigated, and forced the controller into a float state just to see if anything happened. Nothing.
I got my volt meter and discovered something curious. I have no voltage at my MPPT positive and negative terminals. If I disconnect the wires and measure the voltage from wire to wire I get around 340V. Once I re-land the wires I read zero again. I removed the wires and did a continuity check from the negative to positive PV terminals and I get a beep indicating a low resistance path between the two. Any clue what is going on???
Just so folks are aware I had two strings of eight 445watt panels connected to the MPPT for a grand total of 7120 theoretical watts connected to the controller. Based on numbers I was seeing Saturday and Sunday during full sun I was getting around 4-5kW of output from the panels. Overpanneling shouldn't be an issue for MPPTs based on my reading on the forum correct? Looking at the graphs from schneider today it seems to have stopped producing around lunch for whatever reason.
Did I fry the unit some how? Do I have a lemon?
Today I get back home from work and check on the system and notice that the battery voltage is low (53V) and should be getting charged from the solar panels. The MPPT controller was indicating it was connected to the battery, but that no charging was taking place. I went into the settings and investigated, and forced the controller into a float state just to see if anything happened. Nothing.
I got my volt meter and discovered something curious. I have no voltage at my MPPT positive and negative terminals. If I disconnect the wires and measure the voltage from wire to wire I get around 340V. Once I re-land the wires I read zero again. I removed the wires and did a continuity check from the negative to positive PV terminals and I get a beep indicating a low resistance path between the two. Any clue what is going on???
Just so folks are aware I had two strings of eight 445watt panels connected to the MPPT for a grand total of 7120 theoretical watts connected to the controller. Based on numbers I was seeing Saturday and Sunday during full sun I was getting around 4-5kW of output from the panels. Overpanneling shouldn't be an issue for MPPTs based on my reading on the forum correct? Looking at the graphs from schneider today it seems to have stopped producing around lunch for whatever reason.
Did I fry the unit some how? Do I have a lemon?