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Re: Maxing out my small off-grid system

Sat, 07/30/2016 - 15:47
When drilling aluminum you can cut down on the ragged exit hole by drilling slow with very sharp bits. The aluminum should come off in a constant curl and not in chips.

Re: Maxing out my small off-grid system

Sat, 07/30/2016 - 12:03
OK, did a first test hole.  Rather slowly, but without drama.  Thanks for the advice!

Wasn't sure the best way to clean the swarf/nasties on the rear of the drilled hole, so for now flattened them with pliers to literally take the edge off them and all...

Re: Maxing out my small off-grid system

Sat, 07/30/2016 - 09:36
I shall have a go at the new holes in the frame today or tomorrow.

I shall put tape on the bit and a ceramic tile and maybe cardboard behind the part of the frame I am drilling to protect the panel itself.

Rgds

Damon

Re: Indicator to let a person know when the grid is down?

Fri, 07/29/2016 - 19:18
An old mechanical electric clock is low tech but very useful to monitor grid outage.  I just set the time to 12:00 and it will record the time off grid when relay drops out.  May be hard to find these days.  Analog battery powered clock will also work,...

Re: Indicator to let a person know when the grid is down?

Fri, 07/29/2016 - 18:38
Automatic transfer switch, you can find a 30 amp one for $60...

Re: A thought I keep kicking around

Fri, 07/29/2016 - 17:27
IIRC he said it weighs 850 pounds.

Re: A thought I keep kicking around

Thu, 07/28/2016 - 22:35
Where id you get it? Is it one of those axial flux PMA's? If it is does it make a good sine wave?

Re: Indicator to let a person know when the grid is down?

Thu, 07/28/2016 - 19:04
Thanks Rich, OperaHouse -

these are the sorts of things indeed I had in mind.  I'll try to include them in a conversation with my installer.  Have gone over my setup with them.  While a lot of things are working fine (no need to fix what's not broken)...

Re: Indicator to let a person know when the grid is down?

Thu, 07/28/2016 - 13:42
I would probably just run a circuit from the grid to a 125V relay perhaps a dpdt with one side connected to a green light powered off of the house power when the grid power is on and the coil is active, and the other side a red light off of the house p...

Re: Control for heating with solar off grid no batteries

Wed, 07/27/2016 - 18:59
Just got in been a busy day. Hope to work on this tomorrow. The 3 FET I got is IRFP250NPBF
 200V  30A    Phototransitors  60Ma  30V    The ones out of old TV RF 2001 200V  20A

Thanks for the details. I will send PM to you.

Re: Indicator to let a person know when the grid is down?

Wed, 07/27/2016 - 16:15
I had to laugh when I first saw the post.  I worked at a place where the sales staff would forward any ones call to engineering.  A guy wanted to know how to tell if power was lost to his refrigerators.  He already had a clear plastic IDEC relay and co...

Re: Indicator to let a person know when the grid is down?

Wed, 07/27/2016 - 15:54
Quote from: OperaHouse on July 27, 2016, 02:11:42 PMA relay can be connected to the grid side of power before any transfer switch.  When the relay drops out due to no power, a set of relay contacts closes to an alarm.  If ...

Re: Indicator to let a person know when the grid is down?

Wed, 07/27/2016 - 15:48
Quote from: DamonHD on July 27, 2016, 01:27:51 PMWatch your neighbours' houses go dark, and/or their alarms go off?  B^>

Rgds

Damon

Yes, indeed, if it's night, then I can check street lights and all other lights i...

Re: Harris turbine bearing replacement

Wed, 07/27/2016 - 15:18

 After reading that info on bearings further up this thread, I hesitate to add anything, other than my bearing supplier recommends electric motor bearings as being the longest life bearings in a lot of situations.

Re: Maxing out my small off-grid system

Wed, 07/27/2016 - 15:15

 Yeah, I'm cheap too. That's why I suggested drill collars. You can also drill through a piece of wood that will slide over the bit and prevent going too deep.

 I try to not take chances around 100's of dollars of items that cab ruined in a split sec...

Re: Indicator to let a person know when the grid is down?

Wed, 07/27/2016 - 14:11
A relay can be connected to the grid side of power before any transfer switch.  When the relay drops out due to no power, a set of relay contacts closes to an alarm.  If brownouts are an issue or lost phase, a voltage relay should be used.  There are t...

Re: Control for heating with solar off grid no batteries

Wed, 07/27/2016 - 14:04
Couldn't find a way to load the sketch file directly into the PM. You will have to copy it
into a new sketch.  The email word processor sorta clobbers it a bit with some comments ending
up on a new line. The compiling will stop at those lines as an e...

Re: Indicator to let a person know when the grid is down?

Wed, 07/27/2016 - 13:27
Watch your neighbours' houses go dark, and/or their alarms go off?  B^>

Rgds

Damon

Indicator to let a person know when the grid is down?

Wed, 07/27/2016 - 13:24
Hi -

I am wondering if there is such a thing as a standard way that has been worked out to let a person in a grid-tied building know when a power outage has taken place.  Text message or email sent from the system?  Simple flashing light inside the bu...

Re: New Batterires

Wed, 07/27/2016 - 07:51
QuoteSerious case of envy.
Yeah, a crew like this is to be envied...I guess we could farm them out

Spar, the photo was mostly staged, although they were eager to help with unwrapping, schlepping plywood, running the screw-gun.  Although th...