Wiring Size and 12v DC Amperage (Bluetti AC300)

[Simon E]

Hi all,

I am planning on building out a van and need some help discerning how exactly amperage works with a 12v DC system.
I am charging the Bluetti AC300 + B300K with 400W of Solar. I am then running 12v puck lights, a 12v refrigerator, MAXXAIR Fan, and a 12v Water Pump off the AC300.

Total Amps being drawn at max (according to manufacturer) are:
Puck Lights: 1.25 Amps
Refrigerator: 5 Amps
MAXXAIR Fan: 5 Amps
Water Pump: 6.75 Amps
Total: 18 Amps

I am running each circuit for these appliances through the Blue Sea Systems 5026 ST Blade Fuse Block, Then the fuse block will be connected to the AC300 12v DC Output, which is rated for 30 Amps. I am using 8 AWG wire to connect the Fuse Block to the the AC300 12v DC Output. I am then using 14 AWG wire to connect each 12v appliance to the Fuse Block. 4 total circuits being used.

My question is this:
The 12v DC Output is rated for 30 Amps, do I need to run wire that can hold 30amps (8 or 10 AWG wire) to each of the appliances or is 14 AWG sufficient?

Do I need to size the wire according to how many amps the appliances draw? or do I size the wire for the 30 Amps the 12V DC Output?

I am very new to this, I really just want to know if this is going to cause a fire or not. Thanks!

 

[AH Trimble]

this should be helpful for you

https://explorist.life/wire-sizing-calculator/

 

[mikefitz]

12v DC Output is rated for 30 Amps, do I need to run wire that can hold 30amps (8 or 10 AWG wire) to each of the appliances or is 14 AWG sufficient?

Each output of the fuse block should have its own blade fuse, fridge and water pump 15 Amp, lights 2.5 amp , fan 7.5 amps. 14AWG cable is OK for all except the fridge. The fridge has a high startup current and the electronics are sensitive to volt drops, recomended 12 or 10 awg for the fridge. 14 awg is OK for fan and pump, lights could use 16awg, may be easier to connect up than14 awg

The feed from the AC 300 to fuse block is OK at 8awg. The Bluetti has overcurrent protection on the 30A port.

 

[Simon E]

Each output of the fuse block should have its own blade fuse, fridge and water pump 15 Amp, lights 2.5 amp , fan 7.5 amps. 14AWG cable is OK for all except the fridge. The fridge has a high startup current and the electronics are sensitive to volt drops, recomended 12 or 10 awg for the fridge. 14 awg is OK for fan and pump, lights could use 16awg, may be easier to connect up than14 awg

The feed from the AC 300 to fuse block is OK at 8awg. The Bluetti has overcurrent protection on the 30A port.

Thank you so much! This was very helpful.

 

[Drizzt321]

14AWG cable is OK for all except the fridge. The fridge has a high startup current and the electronics are sensitive to volt drops, recomended 12 or 10 awg for the fridge.

I'll agree in general, but as a counterpoint my NovaKool 12/24v compressor fridge (dorm fridge style) is on 14awg, although _very_ short run from the fuse block, like 2 ft, maybe 3 tops, and it works fine (~60W, 50W typical running). But your general point for anything with a compressor/motor/inductive load like this is 100% there, oversize by a size or two if there's any possible way. Especially if you're doing a fairly long run.