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Question about panels and power

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Posted by spshaffer on June 13, 2008, 12:59 am
 
Evening All,

Finally!  My  HOA has approved guidelines for Solar Panels!!!

So I am ready to move forward, but I have a what is probably a newbie
silly question

If I have a large set of panels augmenting my city power, and the
power goes out (which happens quite a bit where I live), is there
something in the system that will shed loads that may not be fully
supported by the panels?  What is to prevent my panels from a half
hearted effort to keep the freezer running?

Thanks!

Steve

Posted by Solar Flare on June 13, 2008, 1:57 am
 
To be a grid-tie and follow the rules your co-generator has to disconnect in
the event of grid failure.

Even if it didn't you wouldn't be able to carry the whole world up to the
fault or open point on the grid so your fridge might get about 0.05%
voltage.

There are units that will do both. I have one. It uses batteries and
grid-ties. It also has a secure output for grid failures to carry selected
circuits.

Evening All,

Finally!  My  HOA has approved guidelines for Solar Panels!!!

So I am ready to move forward, but I have a what is probably a newbie
silly question…

If I have a large set of panels augmenting my city power, and the
power goes out (which happens quite a bit where I live), is there
something in the “system” that will shed loads that may not be fully
supported by the panels?  What is to prevent my panels from a half
hearted effort to keep the freezer running?

Thanks!

Steve



Posted by Bill Kaszeta / Photovoltaic Re on June 13, 2008, 2:06 am
 On Thu, 12 Jun 2008 17:59:00 -0700 (PDT), spshaffer@adelphia.net wrote:


Unless you specifically select a system that uses an inverter that has
backup batteries, the inverter must shutdown and disconnect when the utility
stosp working or the voltage/frequency is outside the defined limits.
Most grid connected inverters are not capable of the standalone operation
you are describing.


Bill Kaszeta
Photovoltaic Resources Int'l
Tempe  Arizona  USA
bill@pvri-removethis.biz

Posted by Eeyore on June 13, 2008, 3:23 am
 

spshaffer@adelphia.net wrote:


Bugger all unless it's mid-day.

Graham


Posted by Randy on June 15, 2008, 1:57 am
 
Evening All,

Finally!  My  HOA has approved guidelines for Solar Panels!!!

So I am ready to move forward, but I have a what is probably a newbie
silly question…

If I have a large set of panels augmenting my city power, and the
power goes out (which happens quite a bit where I live), is there
something in the “system” that will shed loads that may not be fully
supported by the panels?  What is to prevent my panels from a half
hearted effort to keep the freezer running?

Thanks!

Steve
Hi Steve
It sounds like you are looking for a grid tie battery backup system.
The grid tie only systems will leave you in the dark during an outage to
prevent sending power to the lines and possibly shocking power company
employee's as well as many other safety reasons.
Grid tie battery backup systems work much like an uninterruptable power
supply with the panels and grid working to keep the batteries charged and
selling off any excess to the power companies.
The down side though is that you have a bunch of batteries to maintain and
the efficiency is lower.
For me, batteries are a good idea since I live in Tornado ally and Ice Storm
Central.
Two battery systems come to mind are the Outback GVFX and Xantrax XW series.
I hope this helps.
Randy



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