Yesterday I found my Round2It, and rewired my PV strings.
Now I have them in 6S and going to input 1 on each inverter.
At 1:30 on a 576 w/m² day, each input is showing ~222V ~5 amps which is 1050 watts
Earlier this morning the string had 258.4V VOC.
View attachment 39073
The panels are 5° incline (essentially flat) and oriented 180°
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These are "295" watt panels, at least 10 years old. I have seen 320W before from them on the LV5048 I used to have.
The prior configuration was 4S3P, all into one input. It was regularly pulling ~16 to ~18 amps and 144 Volts, ~2.1 kW.
Watts are Watts, right?
When the LV6548 has 18 amps of PV pushing into it, the fans are in afterburner mode, even in freezing temps.
Today the fans are on, but if the dial was 1-10 I'd say about a 4. All that energy to run the fans is now going into the battery bank or getting inverted into my house.
Another thing I noticed instantly is that because there is so much more Voltage on the string, the voltage is there much earlier and later in the day. Yesterday sunset was at 6:22 PM and the final PV alarm cutoff happened about 6:10 PM. Prior to this, it was easily around 4:45 PM to 5:15 PM. I know it's not going to add up to very much energy at all, but having a much wider Voltage range for the MPPT to work was easy to notice.
By the way MPP-Solar now has the LVX-6548 with 450V string MPPT! This beast can do 9 in parallel. MPP-Solar says that it can do "grid injection to feed excess PV power to grid". It does only have one PV string input though, 6kW.
www.mppsolar.com
