From: dirtydeeds@dirtcheap.org
"Rheilly Phoull" wrote in message news:_u
dnVuTiZRmJxPPnZ2dnUVZ_rKdnZ2d@westnet.com.au...
> On 22/11/13 09:55, gfretwell@aol.com wrote:
>> On Fri, 22 Nov 2013 09:26:10 +0800, Rheilly Phoull
>> wrote:
>>
>>> G'Day,
>>>
>>> Just thinking about the solar systems inverters and the grid tie.
>>> Why is the grid tie onto the consumer side of the main switch and not
>>> onto the grid ?? ( Meaning no solar power without mains )
>>> That way the consumer would have some power during an outage during
>>> daytime. The tie would still be controlled by the mains presence.
>>>
>>> Cheers ....... Rheilly
>>
>> The solar array is customer owned equipment so it needs to be on the
>> load side of the disconnect. It also gets protection from the main
>> breaker in case of a fault. The line side can be thought of as pretty
>> much unprotected.
>>
>> If the power is out, it is out on the line side too so the inverter
>> will shut down either way. They actually "clock" from the line
>> voltage. No line voltage, no clock, no output.
>>
>> There are some companies that are coming out with an inverter that
>> will work in an outage but I haven't seen one yet myself..
>>
>
> So the inverter freq. is triggered by the mains freq. so it's always in
> sync ? ( I had overlooked that issue )
Yep. They do make interfaces that will operate in stand-alone mode, but
the unit and the transfer switches/wiring is rather expensive. Most of
the technology was designed for marine/off-grid use, but was modified
for dual mode capability. A typical installation would consist of a
rapid start generator, inverter/UPS system, solar system and all of the
sensing equipment and transfer switches. Very expensive. The battery
bank is not cheap, either.
What you want powered in an outage is directly proportional to the cost.
More = more money.
One may forego the generator, but not the specialized inverter/UPS unit.
--- SoupGate-Win32 v1.05
* Origin: you cannot sedate... all the things you hate (1:229/2)
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