D3monhun73r

Hi guys, So I'm planning to install a 5kW inverter with a 5kwH battery as a backup system. I took a look at the SANS 10142-1 and followed the image they give for connecting a UPS (how my system will be used) to the main distribution board. Ill then have an external person COC the installation to cover my home insurance. Here is the planned system, the inverter will be some way away from the main DB, so I have it with its own main switch and earth leakage. Have i missed anything that could lead to the CoC being rejected?

Hi All, after much research I have sadly come to the realization that for the following system: 5kw 48V Inverter 5kw 48V 100aH Batter Due to the nature of the recommended charge and discharge for LiFePo4 batteries being 0.5C, I would only be able to discharge these batteries at 2.5kw (50aH) per hour, depleting them in 2 hours. Thus my 5kw inverter is being wasted as it can only ever provide 2.5kW of power if I plan to maintain the health of my battery. So if I want to run a 5kw inverter at full load, I would need 2x the battery capacity, effectively 10kwh of batteries. Am I missing something, or is this a well-known limitation of these systems? Either I'd need 2x 48V 100aH in parallel or a 2x24V 100aH battery in series, but both would result in a total battery capacity of 10kwh, which is double the inverter rating. For interest, these are the spec sheets of the invert and battery I am considering https://www.felicitysolar.com/500v-pv-input-5000w-hybrid-inverter-with-mppt-100a-inbuilt_p71.html https://www.solarwaysuppliers.co.za/product/felicity-5kwh-48v-100ah-lifep04-battery/#