[RE-wrenches] wire sizing question

[Jerry Shafer]

Here here always include surge and voltage drop.
On Jan 2, 2015 12:10 PM, "Larry" <larry at starlightsolar.com> wrote:

> Jay,
>
> Divide inverter capacity by LVD then divide by full load efficiency.
> Example: 4000 Watt inverter shuts down at 42 volts, efficiency 85% =
> 4000/42 = 95A/.85 = 111 Amps. Then it depends on the insulation and
> conductor type and the corrections for ambient temp.
>
> How can you not consider voltage drop? This is important for the surge
> capability of inverters. If the battery-inverter run is long you could have
> significant voltage drop for a wire correctly rated for ampacity.
>
> Larry Crutcher
> Starlight Solar Power Systems
>
> On 1/1/15 7:23 PM, jay peltz wrote:
>
>> Happy new year all.
>>
>> I have a question on wire sizing for the following.
>>
>> 250 amp breaker, in a UL enclosure ( say midnite or outback etc)
>> conduit from battery box to enclosure
>>
>> I'm wondering how folks size this for ampacity not voltage drop.
>>
>> thanks
>>
>> jay
>>
>> peltz power
>>
>>
>>
>>
>>
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