Expanding Battery Storage in a Rental — What's the Best Approach?

Not as far as I’m aware.
Maybe others can weight on on between each battery and busbar, fuse or not.

All batteries in parallel, all with the exact same length wires connected to the busbar to the main fuse, the thick wires from busbar to fuse to inverter.

MPPT’s are supposed to have a smaller fuse to protect their wires between MPPT and busbar.

In some great news, been looking through VRM and the VictronConnect app today. Fantastic! The level of control in plain English is really good!

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Where do you all get your “consumables” / accessories from e.g. bus bars, wires, connectors, fuses, fuse boxes, switches and all that go into such a system?

Got:
Inverter
Cerbo
Cells

Waiting:
BMS
Fuses

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From all over … not one shop I can think of right now.

Trick is, get the NoArk rated for DC. The Ex9BP for solar the correct range IF that is your route you want to take, no fuses, just NoArk breakers per string.

Alright, so will the following be compliant with warranty?

Expecting max AC draw of 16A (for first cut UPS setup) and max DC current of 25A for the small bank (0.5C for 50Ah → 25A)

AC wire size: 2.5mm2
DC wire size: 10mm2

Standard 16A wall plug → 1 pole 16A/20A circuit breaker → MP-II → 25 / 50A DC breaker → BMS → cells?

Another question - Victron manual says earth leakage box in series. Anybody can explain again?

Anything bad/wrong about connecting the MP-2 AC-In and then a simple AC out for starters? Just to check the AC side/passthrough without any DC connected whatsoever? Is this even allowed/possible?

Also to check comms with Cerbo and so on?

It can start up in that way, because it has a power supply on the AC input to power things. It will then charge up its DC bus (which only has some capacitors on it). You won’t be able to get very much done in this way, you can’t even reliably do firmware updates or configuration like this. Nothing bad will happen, but also nothing really extensive can be tested. You will be able to see that it communicates with the Cerbo.

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