marbella
New Member
- Joined
- Feb 11, 2022
- Messages
- 93
Dear experts, please advice what you think about the following upgrade
I run a bank of 3 pylontec US3000C (3,5kWh) plus a Must 5048n pv1800 on 12 poly 230W panels in 4 strings of 3 (3s4p)
Recently I installed a solar roof with 6 panels of 450W 72 cells, that obviously dont go well together with the older 60cell panels
There was even 13amp flowing backwards in the polycells untill I installed some diodes
But of course, the performance is not optimal and the max Vcc of 135V is scary close to the 145V max of the PV1800?
Now I want to go redundant and instead of only adding a second mppt charger I want to buy an Axpert 4 5kVA on the same batterie bank of 48V
as it seems the AXpert communicates with the pylontecs can bus SOC what I was told the Must wont.?(voltage controlled small save area for must not using ax capacity)
https://autosolar.es/pdf/ficha-tecnica-3004136.pdf inverter with
https://autosolar.es/baterias-litio-48v/bateria-litio-35kwh-pylontech-us3000-48v battery
+ old inverter https://autosolar.es/inversores-cargadores-48v/inversor-cargador-5000w-48v-mppt-80a-must-solar
worries:
if both inverters by coincidence are on max load the discharging current for the batteries will be to high 5+5.6kva=10,6kva /48V*1,08 = 238Amp
3*37= 111 A (recommended)
3*50= 150A, peak 300A but the bms should cut them off automatically??????
charging current wont be too high as I don't have so many panels but
I could upgrade with the voltronic to 5000 (6000)W Solar charging, correct ??
I run a bank of 3 pylontec US3000C (3,5kWh) plus a Must 5048n pv1800 on 12 poly 230W panels in 4 strings of 3 (3s4p)
Recently I installed a solar roof with 6 panels of 450W 72 cells, that obviously dont go well together with the older 60cell panels
There was even 13amp flowing backwards in the polycells untill I installed some diodes
But of course, the performance is not optimal and the max Vcc of 135V is scary close to the 145V max of the PV1800?
Now I want to go redundant and instead of only adding a second mppt charger I want to buy an Axpert 4 5kVA on the same batterie bank of 48V
as it seems the AXpert communicates with the pylontecs can bus SOC what I was told the Must wont.?(voltage controlled small save area for must not using ax capacity)
https://autosolar.es/pdf/ficha-tecnica-3004136.pdf inverter with
https://autosolar.es/baterias-litio-48v/bateria-litio-35kwh-pylontech-us3000-48v battery
+ old inverter https://autosolar.es/inversores-cargadores-48v/inversor-cargador-5000w-48v-mppt-80a-must-solar
worries:
if both inverters by coincidence are on max load the discharging current for the batteries will be to high 5+5.6kva=10,6kva /48V*1,08 = 238Amp
3*37= 111 A (recommended)
3*50= 150A, peak 300A but the bms should cut them off automatically??????
charging current wont be too high as I don't have so many panels but
I could upgrade with the voltronic to 5000 (6000)W Solar charging, correct ??
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