I’ve had a bit a of a headache doing the fusing and trying to factor in the inverter running at peak load (2200w)
The Blue Sea 12v fused DC distribution block won’t have more than 50A running through it.
The batteries are cheap LiFePO4’s with 100A discharge limits.
I am a bit concerned if I’m running the system flat out that the BMS’ won’t handle it.
I’ve been told on startup the Victron 12/1200 inverter can pull a huge amount of current.
I’ve got BMV, I didn’t put it in the wiring diagram. I’m more concerned with the fuse and wiring sizing along with the max discharge of the batteries when the system is running full tilt.
Have you read the wiring sizing section in the Victron guide, “Wiring Unlimited”, which can be found at Wiring Unlimited - Victron Energy
Have you checked your runs for voltage drop, the Victron Toolkit app for phones has a voltage drop calculator. Others are available on line.
Victron manuals tend to recommend wiring sizes and fuse sizes. A simple once over and it looks OK. On start up you may need to precharge the inverter, search on here for precharge.
Equipment manuals often recommend fuse sizes for that equipment. If not use a fuse that no higher than the maximum wiring rating as the fuse is predominantly there to protect the wiring from short circuit. A fuse should be at least 25% higher than the max continuous current so it does not get too hot during normal use. For a 40A load, fuse should be 50A or higher.
The manual only makes mention of a replaceable 200A internal fuse.
Should I reconsider the 200A MEGA fuse to the inverter and make it a little smaller? Will the MEGA’s be faster acting than the internal fuse?
As I said in my earlier reply, I gave it a quick once over and it looks OK, both cable sizes which are generous so voltage drop should be low, and fusing sizes. The only one I would question is be the 50A to the 100A Blue Sea DC loads block, if the max loads are 40A then 50A is fine.
Yeah just lights, a camping fridge and some monitoring equipments. Maybe a router down the line.
I very much doubt it’ll even go over 20A.
I was more concerned about limiting the 12dc distribution on account of when the inverter hits peak load, on startup for instance, I didn’t want the 250A MRBF fuses to pop
Fuses do not pop instantly, they take time to heat up to melting, See the link to the 250A MRBF, it can take 6 times rated current for 0.1 seconds. You will be OK.
