RobertB

I have an inverter with 4 pylontech batteries which I use as a backup system.
I charge them from the mains as I don’t have solar panels installed.
With recent load shedding in my town  I did a calculation and the charging costs for power worked out to a bit less than R1 per hour of downtime.
With this in mind and installation costs of about R30k for ten solar panels it becomes a difficult decision for me. 30 000 hours is a lot of downtime.
As long as downtime is split between 20 hours down and 4 hours up my system can cope every day. With a recent 20 hour downtime the batteries were charged to 52V inside 2 hours 30 mins at 49 amps. Take note that they can be charged at 100 amps which should shorten the time considerably. I used 49 amps as my generator can then charge them as well. Which I had to do when we had a 4 day power outage.