My Home Brew system

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My Home Brew system

Postby Ozemate » Wed Jun 24, 2015 2:49 pm

My Little set-up to help save money

What I have put together
5Kw On East Facing Roof : Grid Connect
3Kw on North Facing Roof : Grid Connect
2Kw on West Facing Roof : Grid Connect

My Feed in Taffif is 7.5Cents

1Kw on East facing : feeding 5 X 100Ah deep cycle batteries

I have combined a few step to come up with what I believe is a good Balance
In my shed I have 2 small CHEST freezers and a beer fridge
At night I have a timer that will turn off the Power to 2 X Chest Freezers from 17:00 to 07:00
In each of the Freezers there is 4 X 2lt High Salt concentrate water bottles
From 18:00 to 23:00 I have 2 x 500w micro grid connect inverters this feeds 1Kw into the House.
I also have a simple Bypass set so when the Batteries are full the feed from the panels cuts over and feeds the Micro inverters so no power is lost
My last power bill was $0.00

All the parts for the Shed set-up where purchased from Ebay

Hope this give food for thought
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Re: My Home Brew system

Postby Gordon-Loomberah » Wed Jun 24, 2015 3:01 pm

What sort of micro grid connect inverters do you have powering the house when there is no sunlight? Do they run from batteries? I'm pretty sure you can't legally feed the grid from batteries.

Has this installation been approved by your electricity supplier?
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Re: My Home Brew system

Postby Ozemate » Wed Jun 24, 2015 3:26 pm

Not feeding Grid -> feeding house
Yes they run from Batteries at night
Micro inverter
http://cgi.ebay.com.au/ws/eBayISAPI.dll ... 9222475016
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Re: My Home Brew system

Postby Gordon-Loomberah » Wed Jun 24, 2015 3:40 pm

Hmmm, the listing suggests plugging it into a power point... presumably using a plug of death as per point 2 in the user guide:

AC socket: Connect to the mains. Put the side of the AC cord which has holes into the
inverter with 3 foot outlet and the other side of the AC cord to home 3PIN AC outlet.

>>Features:
Pure Sine Wave Output
Fed the power to city net
No battery for solar systme anymore, really enviroment friendly
Reverse your power meter cut your bill

I'm fairly sure that is not legal, or safe.
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Re: My Home Brew system

Postby Ozemate » Wed Jun 24, 2015 9:12 pm

I have tested the inverter and only fires up when ac is detected on the ac side otherwise sits in standy mode
can be run direct from solar panels or battery.
Max output is 500watts .
.
I have removed the suicide plug and hard wired the plug end to a Shielded Buzz bar with suitable circuit breaker.

This rig has been running for over 6 months now with out a hitch and away from sticky fingers ... Children
IE a Locked ventilated battery box and Locked Electrical cabinet.
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Re: My Home Brew system

Postby lantern » Fri Jun 26, 2015 2:08 pm

feeding 5 X 100Ah deep cycle batteries

Why do I cringe when I read things like this.

http://www.smartgauge.co.uk/batt_con.html

Please read.
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Re: My Home Brew system

Postby Ray » Sun Jun 28, 2015 10:19 am

How much salt did you put into your 2 litre bottle of water ?

I am going to do the same thing with a timer as a bandaid to my not enough solar panel problem :(

Great info on how to connect batteries correctly btw lantern.
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Re: My Home Brew system

Postby Gordon-Loomberah » Sun Jun 28, 2015 2:56 pm

To get the lowest freezing point for a saline solution, keep adding salt until it is saturated, ie no more will dissolve. This will be a bit over 20% w/v, and you should be able to get the FP down to about -20C. You'll need to run your freezer colder than normal to freeze it solid. I keep a few 2l "cold ice' containers in the chest freezer for taking into town when buying ice cream, and other food best kept well below 0C.
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Re: My Home Brew system

Postby Tracker » Tue Jun 30, 2015 4:14 pm

.
So you do have a Legit PV-feedin system and then the supplementary fiddles ..

One thing with the frozen water bottles, is that they may help in the freezer but (assuming they are frost free - ie with fans) the cold won't be distributed.. you could try replacing the freezer fans with 12V ones that run most of the time except during defrost..
12V fans are used in Fing-Paykel fridges (older ones)

I had the best of intentions to do the same with our fridges, but the freezers don't have the room for the blessed bottles. :roll:

The best refrigerators to do this with are newer ones that use a thermostatic damper. To limit the air going to the PC compartment .. I think most newer ones now have such devices..
This means that the freezer just cycles as a COLD RESEVOIR.. and some cold is stolen via the fan, to cool the rest ie. The PC..
..
.
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Re: My Home Brew system

Postby Ozemate » Thu Jul 02, 2015 11:31 am

lantern wrote:feeding 5 X 100Ah deep cycle batteries

Why do I cringe when I read things like this.

http://www.smartgauge.co.uk/batt_con.html

Please read.


The batteries are set up in a configuration similar to Method 4 but with 5 batteries and the load and charged focused on the centre battery as this is the best option to keep a good balance
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