2200w 12v wire/fuse size question

[rack04]

I'm piecing together a 2200W solar system for an off grid hunting cabin. Currently looking at a 2200W 12V pure sign wave inverter and I'm attempting to size the wire and fuse. Here is my logic:

• 2200 inverter watts / .85 inverter efficiency = 2588.24 DC watts / 12V DC = 215.69 max DC Amps
• Using 215.69 max DC amps, 12V DC, 12' conductor, variable load type, and terminated on a fuse as input into this calculator I get 1 AWG wire. Just for safety and availability I am proposing to up size the wire to 1/0 AWG.
• Using 1/0 AWG as input into this chart I get 300 DC Amps ANL Fuse.

Does this approach seem accurate and reasonable?

 

[John Frum]

I'm piecing together a 2200W solar system for an off grid hunting cabin. Currently looking at a 2200W 12V pure sign wave inverter and I'm attempting to size the wire and fuse. Here is my logic:

• 2200 inverter watts / .85 inverter efficiency = 2588.24 DC watts / 12V DC = 215.69 max DC Amps
• Using 215.69 max DC amps, 12V DC, 12' conductor, variable load type, and terminated on a fuse as input into this calculator I get 1 AWG wire. Just for safety and availability I am proposing to up size the wire to 1/0 AWG.
• Using 1/0 AWG as input into this chart I get 300 DC Amps ANL Fuse.

Does this approach seem accurate and reasonable?

All good except your fuse it too big.
1/0 is rated for 285 amps max. https://diysolarforum.com/threads/blue-sea-fuse-block.10237/#post-113437

 

[tim0shel]

What inverter are you looking at using?

 

[rack04]

What inverter are you looking at using?

Amazon.com: Pure Sine Wave Power Inverter 2200Watt DC 12volt to AC 120volt with Dual AC Outlets and 2.4A USB Port & LED Display Remote Controller for RV Trucks Boats and Emergency: Car Electronics

Amazon.com: Pure Sine Wave Power Inverter 2200Watt DC 12volt to AC 120volt with Dual AC Outlets and 2.4A USB Port & LED Display Remote Controller for RV Trucks Boats and Emergency: Car Electronics

www.amazon.com

 

[tim0shel]

Looks like a nice one didnt see footprint specs on it. Only thing I didnt like is that 2amp idle current draw. For my need this would be alot.

 

[orangeminnie]

I'm piecing together a 2200W solar system for an off grid hunting cabin. Currently looking at a 2200W 12V pure sign wave inverter and I'm attempting to size the wire and fuse. Here is my logic:

• 2200 inverter watts / .85 inverter efficiency = 2588.24 DC watts / 12V DC = 215.69 max DC Amps
• Using 215.69 max DC amps, 12V DC, 12' conductor, variable load type, and terminated on a fuse as input into this calculator I get 1 AWG wire. Just for safety and availability I am proposing to up size the wire to 1/0 AWG.
• Using 1/0 AWG as input into this chart I get 300 DC Amps ANL Fuse.

Does this approach seem accurate and reasonable?

I would use 11.5V DC, since inverter will still work that low, and the current will rise accordingly. The rest looks great. For fuse size, multiply the amps by somewhere between x1.1 and x1.5, depending on your taste for equipment protection vs immunity from nuisance trips. For an inverter that would rarely be maxxed out, x1.1 works for me. A 250-300A fuse makes sense.

 

[Hedges]

I would use 2/0 wire.
That's what I'm using for less current (6kW at 48V, higher efficiency), and same IR drop for me would be 1/4 as much percentage-wise.

ANL fuse ... you haven't described your battery. If it can feed the inverter for any length of time, may have significant short circuit current.
ANL fuse interrupt ratings vary, may be marginal.
There are several other types to consider - MRBF, Class-T