Shore Power Question

DIY
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1

Question:

I am designing a system that is 100% shore power and I am looking at using the 12/375 inverter as I will have a draw of about 125w of equipment (some will be from bus bar at 12vdc and some from inverter) and want some overhead room on the inverter side of things.

Is it advised to pull this load from the batteries via bus bar (inverter and standard 12vdc loads) and then use the Blue Smart IP22 12/30 to replenish the battery at 30A direct OR should I attach the Blue Smart IP 22 12/30 to the bus bar?

Is this splitting hairs? The batteries will be LiPo and likely Sun Fun Kits with Victron Comms and are more of a “backup” to CYA if the power is lost but if it is advised to pull from them to keep them running right thats not an issue.

Is there another cheaper just as reliable way for doing batteries like the SOK brand with a shunt that will allow me to see everything thru the Cerbo, if so does anyone have recommendations?

Should I have a battery protect and a mega fuse in-line and if so where suggested?

If I need a shunt, do I need to calculate just the amps of the load or the combined battery amps? ie: If I have 2x 300ah batteries I would need the 1,000A shunt?

Thanks!

2

Have a look at one of the smaller multiplus compact inverters, as this also includes charger and mains changeover switching.
If 100% shore power I presume that this is all back up in case shore power fails?

3

Yes for a construction site. I was hoping to keep things small, not sure the size of a multi-plus but the cabinet is only 36Hx22Wx13D and house a lot of electronics so not sure a multi-plus would fit they all look pretty big.

4

Would you suggest the 12/500va multi plus in this instance? I assume that can plug into the CerboGX direct so it can be monitored?

Just need to add a shunt and maybe battery protect?