Please could I ask for some guidance / advice here.
I'm upgrading my existing system from 2 x 5kw Axpert inverters to a Quatrro 10000va.
My existing array is potentially 7840w - I don't want to have to lose any panels, and or have to add any more panels.
From my existing system, I already have an array of 28 x 280w monocrystalline panels. They are divided into 4 strings of 7 panels each. I've used the Victron mppt calculator, and I'm getting an answer of the SmartSolar MPPT 250/100 MC4.
My panel specs are as follows:
- Vmp = 31.4v
- Imp = 8.96A
- Voc = 39.1V
- Isc = 9.50A
- Eff = 17.2%
- Temp coefficient of Voc = -0.33%/c
- Temp coefficient of Isc = 0.059%/c
My questions are:
- If I keep my strings as 7 x 39.1Voc = 273.7 (I'm not taking any inefficiencies into account yet), do I potentiely risk running to much voltage into my charge controller? Should I rather re-string my array as follows 7 strings of 4 panels which would be then 4 x 39.1Voc = 156.4v?
- Do I need two charge controllers to compensate for the amperage? I'm running 4 x 2.4Kwh pylontech batteries on a 48v system.
Many thanks in advance