[Shop-talk] ohms law stuff

[Donald H Locker]

I forgot to copy the list; apologies for the duplicates.

donald.

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On 2020-09-26 6:19 p.m., Donald H Locker wrote:
> 750W/12V/0.85 = 73.5A (750W is MUCH greater than 175!)
> 
> Label says "Full Load Input Current: 76A" so I'd be strongly inclined to
> size the wiring, fuses, and connectors for that current or you'll risk
> overheatig the wires.
> 
> If you really plan to only ever draw 175W, plan for about 70%
> efficiency: 175/12/0.70 = 21A
> 
> If you ever expect to operate the inverter without the engine on, plan
> for the 10V battery level, so 175/10/0.70 = 25A.
> 
> I'd plan wiring and fuse for 30A if you expect to draw 175W. Depending
> on length, 10AWG would probably work, but use 8AWG if you want to be
> safe.
> <http://www.offroaders.com/technical/12-volt-wiring-tech-gauge-to-amps/>
> has a useful table.
> 
> Donald.
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> On 2020-09-26 5:59 p.m., john niolon wrote:
>> Pat, the fuse on the input size is 15 amp  so #12 is still acceptable
>> Jim, here's the specs
>>
>