Battery Charger, Fuse/Breaker Question

[FallBlaze73]

Greetings. I have the following items and have a couple questions. The primary purpose of this setup is to provide backup power to my GE 10.6 Cu. Ft. chest freezer in the event of a power outage. The electrical specifications for the freezer estimates 218 kilowatt hours annually, which is about 600 watts/day.

Question #1 - Is it safe to connect the charger and the inverter to the battery at the same time? The thought being normally the household power would keep the battery full, inverter running, and freezer working. And, in the event of a power outage the power would continue to be pulled from the battery and keep the freezer running until power is restored.

Question #2 - I installed 2/0 AWG cables between the battery and the inverter, but I need to install a fuse/breaker between the two. Any recommendations on quality fuse/breaker manufacturers? Also, any thoughts on size? I was thinking 250A based on the cable size, but would like confirmation.


Finally, on the surface this may appear to be a lot of effort to keep a freezer running, but it's a first step in seeing how things work. Next step will be to hook up a charge controller and some solar panels!

Any/all feedback is appreciated.

1. A SOK 12.8V 206AH Lithium Iron Phosphate battery.

https://www.sokbattery.com/products/12v-206ah-lifepo4-lithium-iron-phosphate-battery-pack

2. A Victron Energy Blue Smart IP22 12-Volt 30 amp 120V, 3 Output Battery Charger that I use to charge the battery.

https://www.amazon.com/dp/B08TRPJKNP

3. A Giandel Pure Sine Wave Power Inverter 2200Watt DC 12volt to AC 120volt

https://www.amazon.com/dp/B07ZNTXN7P

 

[FilterGuy]

Question #1 - Is it safe to connect the charger and the inverter to the battery at the same time? The thought being normally the household power would keep the battery full, inverter running, and freezer working. And, in the event of a power outage the power would continue to be pulled from the battery and keep the freezer running until power is restored.

Yes.... that is fine.

Question #2 - I installed 2/0 AWG cables between the battery and the inverter, but I need to install a fuse/breaker between the two. Any recommendations on quality fuse/breaker manufacturers? Also, any thoughts on size? I was thinking 250A based on the cable size, but would like confirmation.

Lets do some math.
You have a 2200W inverter. The Giandels tend to run at ~85% efficentcy, so they will draw ~ 2200W/.85=2588W from the battery.
When the battery is low, the voltage will be ~12V so the current will be 2588W/12V=215A,

Depending on the type of cable, the 2/0 may be too small. For the large DC wires I like to use marine grade wire that is rated for 105deg


For fuses, it is best to run that at 25% above the max continuous amperage. So 215A x 1.25 = 269A. You can probably find a 275A class T fuse.