Jul 17

Circle of Life – The Cat and the Tree

 

Many years ago we were given a kitten. We took it on a bit reluctantly but it grew to be a part of the family. It was a long haired black cat called Gremlin.

As far as cat’s go, it was a bit skittish and really only liked one or two people and, sometimes, the dog. It tolerated me, barely, most of the time, although occassionally it would come up for a pat or to ask for food.

I guess you could describe our relationship as polite indifference.

 

 

Quite awhile ago, as it aged, it started losing it’s sight and spent more and more time curled up on the couch or asleep on the window sill in the sun. It also spent more time coming up for a pat or to sit on our laps. Last week we had to take it to the vet as it came down with some sort of cold or flue.

The vet gave her a shot and gave us some anitbiotics to give her. The Vet also said she may have some other problems related to her age and asked if we wanted to get some additional tests done. We said we would see how she responded to the antibiotics first and then make a decision and we took her home.

For the first few days she seemed to come good but was still off her food, but it become increasingly difficult to give her the medication. By day four, it was clear that she was losing strength and she continually tried to go outside and hide. As she became weaker we decided to keep her in the bedroom away from the other cat and the dog, and she sat quietly, only occassionally moving around the bedroom.

And she sat, and sat, and sat. She would respond briefly to a pat or being gently held but it was clear that she just wanted to quietly sit. And so she did.

I was amazed at the graceful way she just seemd to be quietly waiting. She didn’t appear to be in pain or distress. She just quietly sat, waiting!

Late last week, when we got up, there she was, curled up on the floor in the on-suite, no longer waiting.

We had already discussed what we wanted to do when it came time and so, we headed down the street and bought a small wattle tree and took the tree and Gremlin the cat down to an empty spot on the garden.

We buried the cat and planted the wattle on top and we look forward to watching the wattle grow near the bee hives and the Circle of Life continue.

I think I’ll miss that cat!

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Jul 10

Cold Feet

Where was that cold breeze coming from? I could feel it around my feet and legs while sitting in the lounge room. So could everyone else. Not a strong breeze by any means, just a gentle wisp now and then, but definitely there and definitely cold.

I checked the window but it was closed, the bubblewrap insulation that we installed earlier in the year (see here) on the bottom half was intact and the heavy curtains were protecting the room pretty well. But that didn’t explain the breeze nor did the slight amount of air leaking around the weather stripping on the front door (which I will have to upgrade as well). The other window was sealed and protected.

Then we noticed a breeze near the door to the kitchen but it was coming from above! That’s when I had the AHA! moment. I had forgotten about the clerestory windows. Well not quite forgotten so much as stopped remembering that they were on my to-do list. I had put off working on them because it was a bit inconvenient since they are 5 metres off the ground. But it had to be done, and it had to be done now because I had to return the extension ladder to my mate next door the next day.

We have two sets where we have cathedral ceilings in the lounge/dining area and in the family/kitchen area. I tackled the set in the family room first. Because they are at the highest point in the ceiling they lose a lot of heat because the warm air rises. So insulating these should have a significant impact.

Armed with a few cleaning cloths I climbed the ladder and started cleaning the filth that had accumulated from the bugs and condensation. I could feel the cold from the windows quite easily.

Once the windows were clean I checked the measurements and cut out some bubblewrap for each of the windows. Even though one of the windows can open, and we do open these to help vent hot air in summer, I decided to just staple the bubblewrap up against the frame and sort out a more permanent solution later in the year.

I also decided to use two sheets of bubblewrap (with the bubbles facing each other to increase the airgaps) on each window to increase the insulation effectiveness. As soon as I put the bubblewrap on the windows the effect was amazing. The cold just stopped! It was even more dramatic than the windows at ground level.

When I climbed back dwon the ladder everyone commented that that they could feel the difference. I’m not sure how much was psychological but that’s not a problem either. Perception is important.

Once I had done the second set in the lounge room the effect was definitely noticeable and the room felt noticeably more comfortable. It will be interesting to see over the next week or so whether this has indeed fixed the problem.

So glad I put the effort into climbing up there to do the job.

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Jul 07

An Unexpected Meal

Last year I planted two varieties of broadbeans and they both did reasonably well and we got quite a few meals from them. I liked them so much I retained some of the the beans and planted them a little while ago. They have done ok, but not fabulously well. However, I must have missed quite a few when I collected the beans last year because a mass of beans self-seeded around the place and have gone gang-busters.

Over the last few days I have let the chooks have a bit of a run through the idle vegie beds in preparation for planting and I noticed that there is a profusion of beans ready for the table! As I was feeling just a wee bit peckish I thought “a feed of beans would hit the spot about now”. Then I realised that the rainbow chard had also taken off more than I remembered and the chooks were getting stuck in.

“Right!”, I thought, “that settles it, Beans and Silver Beet it is!”. A few minutes later I was armed to the teeth with fresh beans and greens.

Into the kitchen, into the pot, into the bowl, dotted with butter and finished off with salt, pepper, freshly grated nutmeg and freshly grated parmesan!

10 minutes later… YUM! This is living!! (Hmmm. I think I need a bit of a trim)

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Jul 04

Blackout Buster – Part 3

The PEB (Portable Energy Box – I really must find a better acronym) is complete. Well, at least electrically.

Today I installed the PV connectors after having kept the unit on charge for a few days to check the performance and make sure the batteries were still in good condition since they had been sitting around for a while. Gel cells tend to have quite a good shelf life as long as they are kept reasonably charged but not all of these have been regularly topped up so it is important to check them over before putting them into service.

I decided to try a different type of terminal for the PV compared to the light terminals. I constructed these terminals from 6mm stainless steel (316) bolts, washers and wingnuts. Partly because I already had the bolts and partly because I thought they would be cheaper and I wanted to try a few different techniques. As it turned out they worked out a little cheaper but I’m not sure it was really worth it. Especially since the terminals I used for the lights are very good quality as well.

Assembling and Attaching the PV Terminals

The Negative Terminal in place wating for the Washers and Wingnut

 

 

 

 

 

 

 

 

The nice thing about having terminals like these is that the unit becomes truely portable as you can easily connect and disconnect the PV.

The Completed Unit With All the Connectors

I did a final test with everthing running. The power supply substituted for the PV and the inverter and a lamp were all connected as shown in the pictures. It all worked like a charm.

The PV, Inverter and Light all Connected

Everthing Switched On – Working Perfectly

 

 

 

 

 

 

 

All I have to do now is label everything and put a couple of handles on the box although I am reconsidering putting wheels on the unit as it quite heavy and difficult to move. This will be important if others in the family want to move it.

All in all I am very happy with the unit and I will be using it as much as i can over the next few weeks to make sure there are no problems and to see exactly how energy I can get out of it.

With the 11W globe shown I could provide simple lighting for at least 50 hours or I could power my laptop (through the inverter) for around 15 hours. I can also power anything that is made for use in the car using the cigarette lighter sockets.

The unit is capable of powering about 72W of lighting and a total of 300W of power in it’s present configuration. Of course, I would get less than 2 hours of use at that rate.

One final note about the wiring. Because the regulator switches the negative rail, the positive supply is the common. That means that all the circuit breakers are connected to the negative supply. This seems odd to many people who know a bit about electronics since the negative suppy is usually the common. However, it makes more sense to have the breakers in the side that is NOT common.

So I have one breaker for the PV, one for the battery, one for the regulator light output and one for the power. Normally, best practice is to use two breakers for the battery (on the postive and negative), especially if there is an inverter connected, but one breaker for this unit will be fine.

Even though many people omit the breaker for the PV in small systems it is important to have a breaker or at least an isolator so that when the battery breaker is off you can isloate the PV. Otherwise the PV can deliver power to the system and, if you have an inverter connected with a small (or no) load the PV can provide enough power to keep the inverter on and this presents a very real risk of electrocution on the output of the inverter.

Finally, using a current limited power supply I can charge the unit through the PV terminals. However, if I wanted to use a standard battery charger I could wire a cigarette lighter plug to the battery charger to connect to the 12VDC socket and deliver the charge that way. If I was going to use a charger on a regular basis I think I would simply add another set of terminals in parallel to the existing sockets and use the standard alligator clips that come with many chargers. But that’s a mod for the future.

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Jul 01

The First Day of the Carbon Price

Well, it’s day one of Australia’s historic carbon pricing and, so far, the world has not ended 🙂 !

Although the world is still turning, it has been interesting to see how the spot prices of wholesale electricy have changed over the last 24 hours.

This table from wattclarity.com.au shows pretty clearly that the prices have increased pretty much in line with the predictions. However, as they point out it is still to early to see where the prices will settle over time.

Price on Sunday
(including tax)
Price on Saturday
(pre tax)
Increase
QLD $52.45/MWh $31.25/MWh $21.20/MWh
NSW $58.56/MWh $32.00/MWh $26.56/MWh
VIC $63.36/MWh $36.71/MWh $26.65/MWh
SA $64.69/MWh $35.95/MWh $28.74/MWh
TAS $51.07/MWh $32.94/MWh $18.13/MWh

There are a couple of curious things about these prices if you think about the exposure to carbon intense fuel sources. SA has the highest price increase even though Victoria has the dirtiest fuel source (brown coal) while TAS, although having a lowest increase, still has a relatively high price increase considering that most of it’s power is generated by Hydro. It seems that the direct emissions due to the fuel type is only a part of the overall calculation.

One a personal note, I predicted earlier that my usage charges would rise by no more than 2.3 cents per kWh due to the carbon tax. This is in line with the prices increases in the table.

Origin partially confirmed that this week by informing me that my Green Power surcharge will be reduced by 44% or about 2.4cents per kWh to compensate for the price rises due partially to the carbon tax AND OTHER FACTORS.

So I’m predicting that the price rise will be higher but I intend to take them to task on this and ask for a breakdown of the increases.

I’d suggest that you do the same, especially if you are already purchasing GreenPower.

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