Battery V sense cutoff for appliances

[jbinbi]

I am looking to leave my fridge always on but would like the power to shutoff if the bat V drops below a certain level. I have some amount of solar, 250W, but not always at the boat. Solar is the only charge source for the battery when not motoring, boat is on a mooring.

I might be away for a week or 2, so if I leave the fridge on and it is not sunny for a few days, I would like the power to the fridge to cut out when bat V hits a certain level, like say 12V. And if the sun comes back out and the battery recharges up to 12.4, power comes on.

I found this on Amazon, but not thrilled to trust my battery to a $15 solution.

https://www.amazon.com/Battery-Prote.../dp/B07H4T3LS7

Hoping someone else has figured out something that works and is robust.

[ItDepends]

Just from a practical standpoint...

If you have food you are going to eat in the fridge, having it turned off for an unknown number of days, coming up to cabin temperature, then cooling down as if nothing had happened, might be very deleterious to the health of people eating that food who would have no knowledge of its history as a biology experiment.

If you do NOT have food in the fridge, why leave it on in the first place?

[jbinbi]

drinks.

But let's stay on topic regarding V sensing cutoff devices...

[Emmalina]

If its a danfos/secop compressor it will disconnect itself Standard battery protection settings (no connection C - P)
12V cut-out [V]12V cut-in [V]24V cut-out [V]24V cut-in [V]
10.411.722.824.2
Optional battery protections settings
Resistor (R2)12V cut-out12V cut-in12V max.24V cut-out24 V cut-in24V max.
[kΩ][V][V]Voltage [V][V][V]Voltage [V]
09.610.917.021.322.731.5
1.69.711.017.021.522.931.5
2.49.911.117.021.823.231.5
3.610.011.317.022.023.431.5
4.710.111.417.022.323.731.5
6.210.211.517.022.523.931.5
8.210.411.717.022.824.231.5
1110.511.817.023.024.531.5
1410.611.917.023.324.731.5
1810.812.017.023.625.031.5
2410.912.217.023.825.231.5
3311.012.317.024.125.531.5
4711.112.417.024.325.731.5
8211.312.517.024.626.031.5
2209.610.9
31.5
tolerances: ± 0.3V DC

DEHC.PK.100.C8.02/520N0436
April 2007

[neflier]

As a followup to Emmalina, check your refrigeration's manual. My Adler Barbour has low voltage protection by default.

[smac999]

Victron battery protect smart. 65a version.

[jbinbi]

Originally Posted by smac999

Victron battery protect smart. 65a version.

Thank you! Just what I was looking for. Same as the cheap amazon products, but from Victron.

Will check refrig as well to see if it has a V sense to turn it off.

Attaching link for those who are interested.

https://www.victronenergy.com/upload...--220-A-EN.pdf