Hello,
a company is designed a whole system for me and I would like to check/understand whether it is ok or not.
The setting they are going to install in my house:
- 3x Multiplus II 48V/3000
- 1x MPPT 150/100
- 12x Sunpro 450Wp
- GX monitoring (I expect Cerbo GX)
- 3x Pylontech US3000C
I've read many articles on the internet, countless topics in this forum and facebook community and I'm still not sure how to understand some things (I'm not an electrician :) ), so I'd like to ask you for a help/explanation or just confirming that I understand it correctly or not.
From the Victron calculator I know that the MPPT with those panels will provide max 100 A.
1. Baterry + MPPT
Each US3000C can be charged by 37A - 3x US300A in parallel can be charge by 111 A total. 100 A < 110 A - so it is OK. And even if I add another MPPT (when I add another panels in future) and the current will be higher then 111 A, the inside BMS connected to GX will manage the current and it still wont be a problem. Is that correct?
2. Battery + Multiplus
This is where I get a bit confused. I've read (for example) this thread https://community.victronenergy.com/questions/127799/question-about-sizing-battery-and-usage-the-batter.html
and this article
https://www.victronenergy.com/live/battery_compatibility:pylontech_phantom
and I'm not sure, whether the 3x US300C is enough or not. According to datasheet, the bartery can provide 48V*37A = 1776 W (3 batteries 5328 W). So if I have 3x multiplus, where each has 2400 W, the batteries cannot provide sufficient power if there is a 100% load. So I would need at least 4 (better 5) batteries for 100% power. Is that correct? Or am I missing something?
Thanks a lot for any explanation.
Jakub