this is a very impressive but dangerous story. And indeed, this should not be happening.
Can you please provide more details on how your 12V equipment is wired to your battery?
Do you have a DC-DC converter or a Battery Protect device in between the loads and the battery?
Do you have a Victron GX device onboard?
There are indeed methods to implement, to prevent this in future, but we need more infos to figure out, what have happened.
Having lived on a sailing yacht for 11 years, and sailed 57,000 miles with 2 pob, Our only auto pilot problem was a stripped gearbox - 1/4 horse 24V dc motor turning a Whitlock Mamba system. A possible cause of the blackout may be excessive current draw from the hydraulic motor, due to the heavy conditions. Whilst the batteries themselves are rated for 200/400A, there may have been voltage drop in the interconnects?
Hi, in my opinion it is related to the SmartProtect (battery protect) that has shut down any power. Probably due to the consumption conditions the power / voltage was unstable and triggering the protection or the cabling unable to handle the required Amps and heating, taking the voltage / power to a level that the BatteryProtection did trigger.
The fact that the power came back and that the issue happened a total of 4 times seems to point either a misconfiguration of the BatteryProtect, or a problem with the wiring not supporting the load during such situations. Check all your connections and cable size, if they are fine and adapted to handle the Amps.
Just recently joined this community and just saw this discussion.
I had a similar event 1 1/2 years ago in less stressful conditions. Was talking to my weather router on the SSB when the genoa (alone) gybed in light conditions and the AP went hard over trying to adjust. I let the boat founder in the light conditions as I wanted to continue talking to the weather router. We were basically hove to. Then all power went out. I still had battery voltage as indicated by my 712 BMV (wired for always ON). I cycled the house bank disconnect switch with on effect and began to get the boat settled back on course steering manually when everything came back on. It had been about 2-3 minutes. No obvious causes. I concluded the house bank output battery protect and VE.Bus BMS were the likely culprits, reacting inappropriately to the "transient". This was not a high current event. The SSB does draw quite a bit when Tx on high power - which I was, but the AP linear drive has a limit switch. Other loads running were two refers and nav equipment. Nothing big.
My system is a very simple all Victron with 3 160ah LiFePO4 batts, Multiplus, 712 BMV, 150/70 MPPT, main out put BP, BP on MPPT and BPs on each engine large alt regulator. The only things that could have done this are the BMS/Main Bank output BP.
It has never happened again under numerous, much more trying loads. Had just rounded Cape Fear, so were not inside the Bermuda Triangle. :)
I am experiencing a similar problem when the boat is under way and the microwave is turned on (microwave running from inverter). In about 30% of the times the microwave is used the Smart Battery Protect momentarily shuts down all 12 Volt DC loads running through the battery protect. The power for the inverter does not go through the battery protect. I feel that the inverter is emitting a pulse, perhaps airborne, that turns the battery protect off momentarily. Any helpful suggestions would be greatly appreciated.
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