kissjoe

No issue at all! If there is any need for “testing” just let me know. I have on touch one more separate mppt so i could remove on string from the MAX. In that case i could still try to run the upgraded FW on just one single string. That would i assume reduce overall noise on MAX as a secondary benefit. Cheers Jozef

It was really weird yesterday... full sunshine and the mppt was giving strange peaks from 2kW it was jumping randomly to 0W on both strings. voltges / currents were changing continously with sometimes higer voltages than the Vmp of the strings... really weird. I tried to switch to the 200V FW and results was the same. Than i moved to the stock 64.62 and the peak power changed to stable 2/1kW -seems stable. My system with the non indentical strings seems does not like the custom FW-s. It may generate higher W at low light but i loose the peak W at normal condition... My current PV1 has Vmp 250V polycrystal (2.3kWpeak) and PV2 has 210V monocrystal (4.5kWpeak).

Thanks, today was very bad weather - ideal for testing... Started with the 200V-FW. PV2 string (Vmp 211V) worked fine, but PV1 (Vmp 126V) was really bad giving only 50W max. After switch onto 150V FW i saw PV1 was jumped a bit - but it was end of the day. Anyhow i switched the FV1 Vmp to 250V - So it should be OK now. Is there any meaningfull update for the secondary CPU as well? (current 38.06) Thanks a lot. Jozef

Hello Coulomb, One question: I have EAsun 11kw Twin inverter with: main CPU 64.07, secondary 38.06 My PV1 string Vmp is 126V, PV2 strings Vmp is 211V In theory i could double PV1 string voltage to Vmp 252V (via reconnecting the panels). What would be the best choice for the FW selection (150/200) in order to meet the 150/200V minimum MPPT voltage criteria? Ideally i would keep current Voltages @126V/211V. Thanks Jozef