How much electricity is being used by old inefficient or faulty appliances?

[Justloadit]

Savings should start on lighting, as we tend to forget this. Even the replacement of the CFL's with LED lights makes a huge saving.
How ever do be careful when doing the replacement, ensure that the LED light you have chosen will give you the amount of light you want.
There is a danger in just looking at the LED "Wattage", this is NOT an indicator one should use for the verification of the amount of light you are going to get.

Good quality LEDs have a very high Lumens to wattage ration. Currently top of the range LED's give you over 120 Lumens per watt on cool white, and 100 Lumens per watt on warm white range.

The cheap LEDs range between 50 an 70 Lumens per watt, leaving much to be desired by unsuspecting customers. Whilst there is a saving on replacing the CFLs with LEDs and the lower efficient LEDs require double the number of lamps to achieve a similar Lumens, the savings are still impressive. Check Here for a comparison chart and here for a Lumens comparison.

[smitty]

Thanks for the figures, you obviously have a genuine interest in this. I think with your guesswork figures if a new freezer paid for itself in energy savings in between 4.2 and 8.4 years then it would work out as a R240-R440 saving per annum and would be a hard sell to a potential customer.

I don't sell appliances but I agree it would be a hard sell although that's more because of short-termism than the numbers themselves. :-)

For example a R240 saving per year is an 11% return on an outlay of ~ R2000. That assumes 1.5kWh per day for the old freezer (could be more but I doubt less*) and 1kWh (actually less) per day for the new freezer and no increase (we know it's going to increase) in electricity costs of R1.27 a kWh.

* If someone who has a smallish freezer (in good running condition) from 2000 could measure it and let us know what it is using then that would help firm up the usage numbers.

For the above example with a faulty freezer the pay back is quicker even if you work on consumption figures of what it would use after being repaired (e.g. my guestimate of 1.5kWh/day) and subtract the cost of the repairs from the purchase price of a new freezer. At R1800 (cost of new freezer less repairs) the return would increase to 13% a year.

There's lots of ways you could save more than this in an average household without the R2000 capital expenditure. When you consider that if you replaced a single 500w halogen floodlight running for 8 hours each night with a 30w LED equivalent you'd be laying out R500.00 and saving R2000 per annum. Payback time would be 3 months and actual rand savings would be five times what the freezer is giving you.

I agree that lighting is probably the quickest pay back of all (after zero-cost life-style changes to reduce usage) because creating light by heating something up until it glows is extremely inefficient as well as the relatively low capital cost of light fittings. An incandescent bulb for CFL swap-out has a very quick payback for lights that are in regular use. Although sometimes fittings need to be replaced because they only had just enough space for an incandescent bulb and can't accommodate a CFL which does push up the cost of changing over and extends the pay back period quite a bit.

I tend to like motion sensors on the security lights (there are pros and cons to this). Swapping out "all night" lights from 60w incandescent to 11w CFL with daylight sensors also makes a noticeable difference.

I would suggest in normal circumstances replacing appliances would only be viable as a part of a much larger energy saving plan and would probable fall under the final phase of that plan once more effective and less costly measures have already been taken such as lighting replacement etc.

I agree entirely about picking the low hanging fruit first. However if you have to replace an appliance for another reason e.g. it died or is on its way out, is really old / inefficient, or it no longer meets your needs e.g. down-scaling or up-scaling your house due to retiring or having kids, then selecting an energy efficient replacement is pretty much a no-brainer.

[smitty]

Savings should start on lighting, as we tend to forget this. Even the replacement of the CFL's with LED lights makes a huge saving.
How ever do be careful when doing the replacement, ensure that the LED light you have chosen will give you the amount of light you want.
There is a danger in just looking at the LED "Wattage", this is NOT an indicator one should use for the verification of the amount of light you are going to get.

Good quality LEDs have a very high Lumens to wattage ration. Currently top of the range LED's give you over 120 Lumens per watt on cool white, and 100 Lumens per watt on warm white range.

The cheap LEDs range between 50 an 70 Lumens per watt, leaving much to be desired by unsuspecting customers. Whilst there is a saving on replacing the CFLs with LEDs and the lower efficient LEDs require double the number of lamps to achieve a similar Lumens, the savings are still impressive. Check Here for a comparison chart and here for a Lumens comparison.

I didn't want this thread to become about lighting but seeing as you've raised the point. I like LEDs and think that they are the way of the future but their current cost overrides the savings in electricity except for certain extended / heavy use applications. They're also great if you trying to run off solar and batteries where every watt counts.

Mostly the numbers don't work out so well for LED due to the currently high cost of LED bulbs to get the desired lumens of light output. Which means that CFL currently seems to be the cheaper option.

For example a 14W CFL yielding 800+ lumens costs R15 and if left on for 4 hours per day 365 days a year will use 20.5kWh per year.

A 60w incandescent uses 87.6kWh and a 100w bulb would use 146kWh.

An 9w LED (I've done some prior reading and these seem to be the way to go for light output) uses 13.14kWh which will save you 8.5kWh per year over the 14w CFL.

The electrical savings over CFL are great (percentage wise) but currently the cost of the LED bulb is still too high. For now I'd recommend fitting CFLs and then if and when LED bulb prices have dropped you can replace your CFLs (either as those die or keep them for spares for your less utilised lights).

Obviously the numbers change depending on how much the light is used. At 6 hours per day the electricity savings are 50% more and at 8 hours a day the savings double while the cost per bulb doesn't change. Lastly it also depends on what you're paying per kWh.

To sum it up if you're going to go LED instead of CFL at the current prices you probably only want to replace bulbs that are on for a very long time.

[Justloadit]

Hi Smitty agreed, however you must factor a couple more items into your CFLsl,

Whilst CFLs cost R15, the life expectancy is very short, in many cases, and I have experienced this, they last approximately 3 months. They don't make them like they used too. What they do is lightly plate the anodes, which slowly deplete into the tube with usage, and eventually die. I have had CFLs which only lasted 3 days. Fat chance getting your warranty replacement lamp.

The other point which is not known to many folks, is that each CFL, has a tiny amount of mercury in it, which is required to ensure proper operation. This mercury is dangerous, as highlighted in this Article.

The majority of users of CFLs simply throw the CFL into their dustbins, and not following the recommended disposal of CFLs, which ultimately lands up in the landfill dump. What the mercury then leaks into the ground, destroying the bacteria which breaks down the rubbish dump. Being a heavy metal, with rains it seeps down into the ground and eventually lands up in our drinking water (bore holes) and rivers. Unfortunately this is a slow process, and will take years to disseminate across the underground water system, meaning that our children will be lumped with the problem.

[smitty]

Hi Smitty agreed, however you must factor a couple more items into your CFLsl,

Whilst CFLs cost R15, the life expectancy is very short, in many cases, and I have experienced this, they last approximately 3 months. They don't make them like they used too. What they do is lightly plate the anodes, which slowly deplete into the tube with usage, and eventually die. I have had CFLs which only lasted 3 days. Fat chance getting your warranty replacement lamp.

Yikes 3 months, what brand is that? In my experience they last years. I like the Osram and Philips brands and they seem good from a quality perspective.

The other point which is not known to many folks, is that each CFL, has a tiny amount of mercury in it, which is required to ensure proper operation. This mercury is dangerous, as highlighted in this Article.

They certainly do contain mercury with current CFL bulbs containing less than 2 mg of mercury each. The article you highlight does make two useful suggestions 1, if a bulb breaks then clean it up instead of leaving it and 2. ensure adequate ventilation i.e. open a window if a bulb breaks. On a side note tuna as an apex predator (poisons are concentrated as you move up the food chain) contains a fair bit of mercury. I like tuna so I've ingested more mercury from eating tuna than from the odd bulb that had broken. Then again maybe that explains a few things...

The majority of users of CFLs simply throw the CFL into their dustbins, and not following the recommended disposal of CFLs, which ultimately lands up in the landfill dump. What the mercury then leaks into the ground, destroying the bacteria which breaks down the rubbish dump. Being a heavy metal, with rains it seeps down into the ground and eventually lands up in our drinking water (bore holes) and rivers. Unfortunately this is a slow process, and will take years to disseminate across the underground water system, meaning that our children will be lumped with the problem.

According to City of Cape Town, Woolworths and Pick 'n Pay have collection points for CFLs. The bulbs last so long that I tend to put them in a cupboard in the replacement bulb's box. Then again my collection hasn't exactly grown so perhaps I should ask Pick 'n Pay if they'll take a dead bulb.

Ja many bad things end up in landfills e.g. batteries, used motor oil, old paint and electronic waste. Hopefully the landfill sites are correctly constructed so that the nasty chemicals (PCBs, heavy metals, etc) do not leak into the groundwater because that is a bad thing.

Many auto repair / service shops actually get paid for their old oil by recyclers who collect it so they probably won't mind if you donate yours to them. Rather drop your eWaste at Makro and PnP takes batteries according to City of CT.

[AndyD]

I'll try not to get bogged down with the lighting side of things but I agree it makes definate financial sense to replace and incandescent or halogen (including dichroic low voltage down lights) with CFL's and it might make sense in certain circumstances to use LED's. This would be at the forefront of any domestic, or commercial for that matter, energy saving plan being relatively low cost, no specialist contractors required and savings that should easily cover the financial outlay in 6 months-1 year.

So assuming the lighting phase of the plan is complete, where to now? Appliances or hot water cylinder maybe?

The hot water cylinder would be a regular consumer and of a high consumption with it heating for several hours per day. Appliances such as fridges are also regular consumers but at much lower amounts of energy. Then you get appliances such as the microwave, kettle, stove and oven that are more occasional consumers but at a high amount and appliances such as IT equipment and TV's that might be 24hr per day consumers even when on standby but at a very low amount. Throw in the complexities of IT and general electronic equipment having notoriously poor power factor courtesy of the cheaply manufactured SM power supplies and suddenly they're back in the running.

It's also about the sacrifices you're willing to make. For example I tried a low-consumption shower head and 3 months later I got rid of it because it maent my shower was no longer a pleasurable experience. I've also reinstalled my airconditioning which was removed a few years ago during renovations because once a month when it's hot and humid as hell and I want to watch TV or have an afternoon nap I missed not having it. In both these cases the saving was relatively small and I decided it wasn't worth the sacrifice.

[Justloadit]

Hi Smitty,

Osram and Phillips which have a decent range in quality don't sell for R15, but consumers still go for the cheap and nasty CFLs that do sell for R12 and R15, especially at Checkers and Spar shops.

[smitty]

Hi Smitty,

Osram and Phillips which have a decent range in quality don't sell for R15, but consumers still go for the cheap and nasty CFLs that do sell for R12 and R15, especially at Checkers and Spar shops.

Good point, I tend to buy in bulk when they are on sale at Makro (hint in case anyone needs any) because "goed koop is duur koop".

[smitty]

I suspect you know all this but it doesn't hurt to put it down for other people to read. :-)

I'll try not to get bogged down with the lighting side of things but I agree it makes definate financial sense to replace and incandescent or halogen (including dichroic low voltage down lights) with CFL's and it might make sense in certain circumstances to use LED's. This would be at the forefront of any domestic, or commercial for that matter, energy saving plan being relatively low cost, no specialist contractors required and savings that should easily cover the financial outlay in 6 months-1 year.

100% agree. Low voltage but high wattage down lights. I dislike spotlights more than down lights but those are a close second. I tend to catch a glimpse of a badly positioned spotlight (and fairly often a down light) and just about get blinded because they're such a bright direct light. That's probably just me though.

So assuming the lighting phase of the plan is complete, where to now? Appliances or hot water cylinder maybe?

The hot water cylinder would be a regular consumer and of a high consumption with it heating for several hours per day. Appliances such as fridges are also regular consumers but at much lower amounts of energy. Then you get appliances such as the microwave, kettle, stove and oven that are more occasional consumers but at a high amount and appliances such as IT equipment and TV's that might be 24hr per day consumers even when on standby but at a very low amount. Throw in the complexities of IT and general electronic equipment having notoriously poor power factor courtesy of the cheaply manufactured SM power supplies and suddenly they're back in the running.

As with all lighting and appliances the consumption of hot water cylinders depends very much on usage. The less water is used the less is heated and if the standing losses are low (temp lowered to match your needs, geyser blanket [check the ends of HWC the insulation does not seem so good there] and pipe lagging fitted) that is where the big saving will come from reducing usage. The plumber who replaced a HWC under warranty became upset when I continued to call him back for leaks at the connections to the pipes but those are wasteful and cost money.

Before looking to replace anything you should know how much it uses as well as what the replacement will use. Once you know (measured is better than product specifications in my opinion) then you can compare the savings per day / month / year to the replacement cost and you can work out the pay back period. Once you have that kind information you can make an informed decision and weigh up the alternatives.

Sometimes it will be marginal savings and you might want to wait until the replacement prices drops (e.g. LEDs), Eskom introduces a subsidy (tends to push up the price), the price of electricity increases or the existing product dies and would have to be replaced because these all change the numbers in a favourable way.

A lot of electronic equipment should probably just be turned off when not in use.

I'm interested in alternative water heating e.g. solar or heat pump because that HWC really can chew power. I'm keeping an eye on the City of Cape Towns initiative around solar water heating because they are expensive.

It's also about the sacrifices you're willing to make. For example I tried a low-consumption shower head and 3 months later I got rid of it because it maent my shower was no longer a pleasurable experience. I've also reinstalled my airconditioning which was removed a few years ago during renovations because once a month when it's hot and humid as hell and I want to watch TV or have an afternoon nap I missed not having it. In both these cases the saving was relatively small and I decided it wasn't worth the sacrifice.

That is another very important point that you raise. Sitting in the dark, eating cold food and having cold showers is no fun... I find the climate in Cape Town very mild and only struggle with the heat on the handful of hot days in January and February and on days like those I put on the fan (if you want hot you should try the Kalahari in summer). I also tend to find that only July and August are actually cold (it's still way colder in Europe / North America) - use a gas heater (and add a fan). However comfort is still important and good ceiling insulation makes a huge difference for both of these (you've also mentioned this in an older post of yours) as do heavy curtains and draft proofing.

You mentioned the size of the saving and I think that is key point - there is no point in spending R5000 to save R300 a year nor is there any point in suffering for a saving of that amount.

Of course not all methods of saving cost you comfort or large sums of money relative to the saving and those are the ones you should make. If your TV, fridge, geyser, washing machine, etc dies and you need to replace it then buying a 32inch LED TV will use less than a third of the watts that an LCD version of the same size will cost you. If you watch a lot of TV (or have kids / family who do) then it may very well be worth your while to pay 10% more for the more efficient TV. A little homework will save you money in the slightly longer term and you won't have to suffer for it.