Can someone "fact check" my plan - Victron 250w phoenix inverter with photo (1 Viewer)

[PaulC70]

Nice new 250w inverter arrived yesterday from Offgrid Solutions, thank you RogerIvy and nigelivy !!!

So, in the photo you can see my 300ah lithium fogstar and where there used to be a second battery under the bench seat (previous owner took it with him I assume) but negative and positive are still attached to the battery, ie parallel setup.
So, my plan (if it's not stupid) is simply connect positive to positive on inverter, negative to negative to inverter and secure inverter. Thats it literally. I plan to physically only use it to charge mobility scooter battery when in the motorhome, Im not wiring it to the hab to make all my plugs live, it will be a standalone plug which I will switch off completely between uses.
Therefore I believe Im right in saying I don't need to ground the inverter seperately?
Also, there's already a fuse in the positive lead so that's covered.

Any thoughts?

 

[Lenny HB]

You need to fit an inline fuse close to the battery and an isolation switch.
All the cables to the battery look very undersize to me & not a good idea the way all the connections have been taken direct to the battery, far better to have a single cable to the battery going to a busbar.

 

[PaulC70]

Cables are standard as fitted by Bailey :-( and no idea where the busbar might be, possibly under the bench on other side of the motorhome. There's already an inline fuse on positive end.

Isolation switch I assume something like this? https://www.amazon.co.uk/dp/B09GG7XRGH/?tag=mhf04-21

 

[PaulC70]

this might be a stupid question too and i get that an isolation switch is to isolate the inverter from the battery but does the switch on the inverter not already do that?

 

[Lenny HB]

Cables are standard as fitted by Bailey

That explains it all Brit built vans use undersize wiring.

The switch on the inverter when it is off the inverter is in standby mode power is still connected to it.

Those switches are not very good they get warm with just 30 amps flowing through them.
Better to fit a branded one like Blue Sea, three times the price but there is a reason for that.
Roger stocks them or you can get them on Amazon.

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[eddie]

And shorten those cables

 

[RogerIvy]

Here is a link to a Victron isolator

Victron Energy Battery Switch ON/OFF 275A — Offgrid Power Solutions

The Battery Switch ON/OFF 275A is suitable for battery systems up to 48V. It has a unique ergonomic and aesthetic knob design. The knob is removable for isolation or safety purposes. The Battery Switch can be either surface or panel-mounted, providing flexibility during installation. The Battery S

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