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Forum: Electrical: Batteries, Generators & Solar

26-02-2015, 08:32

Replies: 33

Conductor size question.

Views: 6,793

Posted By svlamorocha

Re: Conductor size question.

Don´t you worry about the fuse not protecting against burning the windings when the windlass locks? A 200A ANL fuse will take 250A forever without blowing... I would expect that Lewmar´s...

Forum: Electrical: Batteries, Generators & Solar

26-02-2015, 08:28

Replies: 33

Conductor size question.

Views: 6,793

Posted By svlamorocha

Re: Conductor size question.

To Lewmar´s partial credit, in the manual they say that the specified rating of the breaker depends on the model (ie 90A for Concept 1 and 150 for ocncept 2). I say partial credit because in the...

Forum: Electrical: Batteries, Generators & Solar

26-02-2015, 08:16

Replies: 33

Conductor size question.

Views: 6,793

Posted By svlamorocha

Re: Conductor size question.

If you want a precise and long-lasting clamp get one with the Fluke brand. Make sure it measures DC amps (not just AC amps) and has a "Min Max" function. I like the Fluke 325 and 374 that sell for...

Forum: Electrical: Batteries, Generators & Solar

26-02-2015, 04:17

Replies: 33

Conductor size question.

Views: 6,793

Posted By svlamorocha

Re: Conductor size question.

Those tables are only perfectly accurate when the cable from battery to load is all of the same gauge. In your case you have 60ft of AWG 3/0 and 10 ft of AWG 6, and the smaller gauge portions is long...

Forum: Electrical: Batteries, Generators & Solar

26-02-2015, 03:31

Replies: 33

Conductor size question.

Views: 6,793

Posted By svlamorocha

Re: Conductor size question.

Others replies explain relationship between available power and voltage at given speed ( = more voltage gives you more power and available torque). This is not particularly inportant for cable...

Forum: Electrical: Batteries, Generators & Solar

25-02-2015, 15:34

Replies: 33

Conductor size question.

Views: 6,793

Posted By svlamorocha

Re: Conductor size question.

The power (watts) consumed by a motor does not remain constant when you change voltage.

Forum: Electrical: Batteries, Generators & Solar

25-02-2015, 15:08

Replies: 33

Conductor size question.

Views: 6,793

Posted By svlamorocha

Re: Conductor size question.

Your math is not right. When you decrease voltage by X% from rated voltage the current draw increases WAY more than X%. That is why motors burn when you give them low voltage. There are two replies...

Forum: Electrical: Batteries, Generators & Solar

25-02-2015, 13:52

Replies: 33

Conductor size question.

Views: 6,793

Posted By svlamorocha

Re: Conductor size question.

You have about 0.5 volts drop in each of the two gauges, for a total of about 1V. That is quite a bit. .

I have never seen breakers that lose A capacity gradually over time. You can always...

Forum: Electrical: Batteries, Generators & Solar

25-02-2015, 10:23

Replies: 33

Conductor size question.

Views: 6,793

Posted By svlamorocha

Re: Conductor size question.

You are not. You are getting good advice about the wiring.

Now let´s clarify something else about fuses/breakers. If the voltage at the motor is too low (be it because of low batteries or too much...

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