First Test

5PM yesterday Jan exclaimed “We’ve lost the internet!”  This is almost impossible because the politician who selected the technology at the time stated “We have the best in the world” <sarcasm mode off>.  I looked at the light on the security system and immediately noticed it was RED.  No internet connection.  Jan started cooking dinner whilst I went to the main house router to check if the NBN (National Broadband Network) modem was functioning.   It wasn’t.   No internet connection.

Three hours latest Jan notices a message on her phone.   A power outage had occurred in our suburb when a power pole caught fire.  That was rather interesting as all the powerlines in the suburb are underground.  The only above ground electricity is at the southern end of the suburb here there is a large high voltage transmission farm.

Then it dawned on both of us.  The loss of electricity had caused the internet to fail.   We hadn’t noticed the failure because we’re currently “off grid”.  Unlike a number of home battery system ours will work when the grid fails.  During this time we’d been running three air conditioners and Jan had also cooked dinner.   What was the battery state of charge.   Usually it would be around 70-75%.   However it was down to 65%.  Next morning the sun rose and started to rapidly recharge the battery.

Don,

Yes the system can display some comprehensive data.  I haven’t yet activated the Ai function which apparently “learns” our electrical demand requirements.  To date it appears the system is capable of continuously supplying all our current electrical needs.   We actually have to ability to produce more power than we need.  

Another Project and an Interesting Outcome

Trailer Camera

The camper trailer rear view camera wouldn’t connect to the Android Application.  After a number of unsuccessful efforts I declared it a lost cause and returned the camera to the Aliexpress seller and obtained a refund.   Then I searched for another seller and ordered a second camera.   It arrived within a week and I fitted it to the rear of the trailer this morning.

After wiring it into the trailer 12V system I looked for the wifi connection on my phone.  YES! The camera was broadcasting a wifi signal to which I connected my phone.   Would the App now work?

 

Success!   The camera has an additional function which I had been unaware of until I walked behind the trailer only to hear a “beeping” sound from my hearing aids.  The camera senses of there is a pedestrian behind the trailer and broadcast a warning.  

I’m considering mounting the 10” Android tablet on the Isuzu dash in split screen mode.  One screen with the rear view camera picture and the other showing the trailer battery state of charge.

Home Battery

Meanwhile, my thoughts returned to the home battery.   Two days ago I switched the system to “off grid” and we have been successfully coping with power from the solar panels and battery.   Nothing from the Grid.   I’ve also worked out how to display the battery system on the pc browser.  I find it easier to view the data on the pc compared to the phone.

How are things working out?   Actually rather well!

Looking at the data for today I can see a small peak [A] at 5AM when Jan woke and turned on the kettle.  At 5:30 the bore pump started to reticulate the lawns and gardens [B].  Both of these events were powered by the battery.   The solar panels started producing power around 6AM and we stopped using the battery.  There were several peaks [C] where the solar was predominantly recharging the battery.  At 11:35AM the battery was fully charged and as there was no significant demand from the house for electricity the power from the panels reduced [D].  From then onwards the solar only delivered sufficient power to meet the demand from the house.  

Off Grid

Yesterday we received our electricity bill for the two month period Nov-Dec.  This is the first bill we have received for the full period since having the home battery installed.   I was interested to see how the new battery and solar array had changed our bill.

We have been exporting surplus electricity from the solar panels to the Grid.  It’s capped at 1.5kW, however we could send more.  The solar array and battery supplies all our daily electricity.  Most mornings I check the battery state of charge finding it between 68-75%.  The battery is then fully recharged between 10AM and midday. 

Looking at the solar export data from the energy supplier website for the period we appear to be exporting approximately 10kWh daily.

 

This is half of what we were exporting before the battery was installed.   Obviously being capped at 1.5kW is having an effect.  For the previous period (Sep-Oct) we exported 1000kWh and received a rebate of $73.82. 

For this recent period where we were capped we exported 594kWh and received $0.  They take our electricity and pay us zero.

Throughout the billing period we have been exclusively using electricity directly from our solar array or our home battery.   It was therefore interesting to see on the latest bill we had been charged for electricity taken from the Grid.

10.635kWh over 63 days costing $3.13 or $0.17 daily. 

Something doesn’t add up here!

I have deduced two potential conclusions.

1.  The utility company has surplus solar energy and no means to store it so whilst they will accept our exported electricity they won’t pay for it.  No doubt they sell it to our neighbour who doesn’t have solar panels.

2.  We aren’t using any electricity from the Grid but we are paying for the Grid electricity that powers the utility company’s meter on our home power board.

MY ACTION

Within the phone App of our Sigenergy battery system is the ability to “go off grid”.  That is; disconnect us from the Grid and exclusively power the house from the solar panels and battery.  It will be interesting to see what appears on the next utility bill.

Testing the Float Valve

My prototype is in the swimming pool being tested.

If the valve works and cuts off the water I’ll adjust the height of the aluminium mounting bracket.  The plan is to slip the horizontal flat section under the coping paver.

Gosh it’s been hot.  I went for another bike ride returning home around midday very dehydrated.  The air was so hot and dry it felt like I was riding in a blast furnace.  The forecast is for more hot weather with the temperature possibly exceeding 40.   Jan reads narrowboat blog and wishes she was back in an English winter!

Roll the clock forward one day and I’ve made a second attempt with the pool float valve mount.   I couldn’t fit the aluminium plate under the coping paver as it was particularly well glued to the lip of the fibreglass pool.  My new strategy is to drill the vertical face of the cement paver and secure the modified mounting plate with screws and plastic rawl plugs.

It works but the height of the float valve needs to be adjusted.

Meanwhile Jan informs me the pool water is too cold.   Last year she found the sun too hot whilst in the pool which is why we had a new patio installed over the pool.

Obviously the additional shade has been effective.

I needed to check the DIY pool water heating system.  The panels are on the workshop roof.

I can hear the sound of water dripping down the shed drainpipe.  The left panel has sprung a small leak.  However the system is doing its job with the brass fittings on the outlet side if the system too hot to grip.  We’ll be losing a small amount of water but the new float valve should regularly replace it.

A not so successful project is the trailer rear camera. 

 

I have power to it and the camera is broadcasting a wifi signal which I can connect to with both my mobile phone and tablet.   However when I load the App the message ‘No Device’ is displayed on the screen.   I’ve written to the seller but have yet to receive a reply.  I’ll wait two more days and then leave a negative review to see if this initiates some correspondence to resolve the issue.