Typically, when I have an issue, itís New Years morning with a boat
full of family
and Iím in the middle of changing a babies nappy!
This morning whilst on daddy duties I smelled smoke in our starboard hull
(Lagoon 450 owners cabin). Obviously the first job is to get the little one upstairs and then I secured the batteries
as the smoke alarm
sounded. I then opened the window above the bed
and the little window aft of the bed
as I knew it was coming from the battery
compartment. When Iím working under the bed the fastest way to access there is to tie a line thru the aft window onto the foot of the slated bed base to pull the mattress, topper, bedding etc all out of the way in one go. As I did a small amount of burnt plastic smoke came out. It was quite obvious that it was coming from the clear plastic cover over the mega fuse.
Hereís our set up:
Victron Quattro 5000
840ah lead acid battery
750a fuse from batteries
on positive side.
Weíre currently in a marina with shore power
but I like to occasionally run on battery using the inverter
during the sunny hours to cycle the batteries a bit so I was on inverter. We regularly see 4000w on the Victron Color Control when boiling the kettle, heating
the hot water
tank, making water
etc but this morning I was running 2 oil
filled heaters 1000w and 2000w and heating
the hot water tank 1400w. Total draw approx 4,400w. Plus some other small 240v appliances
The inverter didnít trip at any point.
The 2x positive cables
are 95mm2 and were red hot to touch hence the melting fuse.
Iíve checked the cables
all the way from the fuse up to the inverter and all looks good, nothing is melted and itís all cooled down now. Thereís a small amount of damage to the inverter side of the fuse.
Iím guessing I was trying to run too much current
for too long but other than obviously not using the oil
heaters on the inverter what else should I be doing from now on?
Should I replace the 750a fuse with a 500a?
Should I replace the mega fuse holder?
Should the fuse have blown?
Iím no electrics expert (quite the opposite) so please be gentle with my nievity and of course I never leave the boat
unattended with any 220v power source on.
Iíve been running 3 oil filled heaters, 4000w total from the 16a shore power
and also the boats electrics but if I want to boil the kettle for example Iíll turn off the 2000w heater
Thanks for reading and Happy New Year.