Hello All,
I installed a 3 phase system at a client with 3 x 5kVA Multi's, 1 x 20kWhr FreedomWon, and 30 x 370w panels, 2 x 250-100MPPT with VEdirect connection on Venus.
Roof is approx 10deg facing NNW, and both Lorentz data and PVGIS for that set of info has given me my design parameters. Problem is I am not getting near the expected deliverables, I am seeing approx 45% less than expected. Let me elaborate a little
1. The 1 MPPT mostly always leads the other, by a fair wack
2. Client's load is heavy, very heavy, so I dont think thats the problem, no reason for MPPT's/ panels to not deliver, strangely bell curves under advanced look rather good, but just not what it should be.
3. I am seeing max kw from panels as expected based on Lorentz/ PVGIS data, BUT NOT the kwhrs.
4. We initially thought shading was an issue, but all trees cleared now, but no noticable increase in yield from panels.
5. All fuses, voltages on strings checked in combiner box. Cant see a problem.
6. MPPT reset to factory defaults and reprogrammed
7. Venus updated.
What I have not checked is the BMS, and if that is not being restrictive, and also cleanlyness of panels, doubt this will make any difference, but other than that I am stumped??
Any advice maybe
Best Regards