Victron user here. The devices they build are rock solid. They may have some tiny quirks here and there but so do other manufacturers.

If you have some engineering background they are perfect. Everything is open, you can write software extensions in node red for example. Best part is it is modular with open interfaces and it uses standard battery voltages. You can optimize everything for your usage and I’m sure you can keep it Running for decades. A Multiplus has the look and feel of hardware made in the 60-70s. But in a good way: Built to last.

Price wise they are more expensive than chinese Equipment but not a lot more expensive than other systems from well known brands. Can highly recommend

You can estimate the time with a rule of thumb: it’s the battery capacity divided by the charging power.

So if you have a 100kWh battery:

• 1 hour if you charge with 100kW
• 0,5 hours with 200kW
• 0,33 hours with 300kW
• 0,25 hours with 400kW

And so on.

As I said this is an estimation. There are factors playing a role that result in losses or power limitation. So in reality it would take a bit longer.