Jump to content


  • Content count

  • Joined

  • Last visited

  1. Dahua make nice thermal cameras as well as a hybrid which combines a starlight image with the thermal image and makes it easier for unskilled guards to interpret the scene. I made my first CCTV thermal camera up using the Flir unit from a Mercedes and a video server. It's been in a hidden location for a few years now and detects humans at up to 300 meters if used properly. I also have some flir cameras and we clearly pick up humans at 500 meters. I have three types in service.
  2. I'm trying to help my sister to get her laundry more energy efficient. We've sorted out her electricity spikes which catapult her into very high tariffs (800 amps available) and we are now looking at hot water. PV solar is on hold for now (salesman had convinced her she would save hundreds of thousands) as most of the energy is consumed at night and the unit charge is under R1.00/unit off peak. (this is in George) Water is currently heated by a donkey boiler and stored in a 800L bath type tank which I have just insulated along with the circulation and delivery piping. (this has been uninsulated for 18 months) The wood used to fire the boiler is free (furniture offcuts) but needs to be trimmed before it fits the boiler. This means a noisy chainsaw (changed to an electric chainsaw the moment the petrol job needed repair) and labour to do the cutting and handling. Most hot water is consumed at night so storage at a high temperatures is needed. The washing machines wash at 40C and blend cold in to control temps. Water is from a borehole. So the plan is to go with EV tubes into a manifold and simply circulate the tank water with the donkey taking up the slack at night. It would be a low pressure system fed by a circulation pump with the return line terminating above the water level in the tank so that the system can drain when not in use. The huge roof is east / west with a 20 something degree pitch and the peak is about 9 meters above ground. I don't know how many tubes I would need but for the description I'm using forty as I need to understand the best practice configuration. What I do know is that to extract the maximum heat from the tubes the manifold shouldn't be too long as the water heats up it is less efficient at extracting heat from the downstream tubes. So this means a number of manifolds connected in parallel eg 4 x 10 tubes or 2 x 20 tubes etc. Parallel means a decent size pump to ensure circulation through all manifolds and the tops should all be on the same level to avoid uneven flow. The simplest install is east west and same pitch as the roof. Is this feasible or should the tubes be tilted up more? Should we go north facing?
  3. Mako

    Panel (Array) ventilation

    I have two shipping containers next to each other. The tops are silver. My six panels are adjustable for tilt only and face WNW (no choice). Excellent for ventilation and maintenance as I step off a balcony which is level with the container tops. The silver top of the 'next door' container reflects onto the panels in the winter months and definitely makes a difference. Summertime reflection is wasted because of the low tilt angle.
  4. Mako

    Independant Cell Voltage

    Does this happen with batteries commonly used in PV installations? ICV's could approach the critical point where a cell voltage reversal would occur, causing all other cells to charge that cell causing near instantaneous hydrogen gassing and explosion.
  5. Mako

    ROYAL Big Bang

    Good ventilation will not prevent an internal explosion however it will remove free hydrogen which would contribute to the noise.
  6. Mako

    ROYAL Big Bang

    That looks like an internal battery fault that ignited the hydrogen inside that battery. If it was build up at the ceiling the ceiling would be gone.
  7. I've been given a Solaire GTI, It looks like a rebranded Danfoss and not on the COCT approved list as far as I can see. Does anyone know much about them? I may test it once I have the extra panels up to replace my 500 watt micro GTI setup (I'm a micro IPP). The current 500 watt setup is to offset my base 500-600 watts which powers some community PC's and wireless links.
  8. Thanks for the input so far Chris and Plonkster. East West isn't going to happen mainly because the plans are done / submitted, also the house overlooks the lagoon and orientation on the sloping plot is fixed. Mrs. Friend has decided ;-) The way it's laid out now will also provide a walkway along the base of each pitch for easy cleaning of the panels.
  9. Asking for a friend in Langebaan. The plans for a new house have been drawn. Two roof pitches facing NW for panels. The question is around future proofing in terms of the electrical wiring. What should be done to ease a later solar install at the distribution board?
  10. IMO 20% bio blend can be used in any diesel. In fact it's an excellent lubricity additive for low sulphur diesel. Common rail diesels have exceptionally high injector tip temperatures and there is a good chance of coking / polymerization in the injector leading to failure if percentages higher than 50/50 are used. In other vehicles post injection to clean diesel particulate filters restricts the use of higher bio percentages. (Late injection [Piston low down in the bore] of low volatility bio gets onto the cylinder walls and finds its way into the crankcase oil) Water in bio is the biggest killer of injector pumps and injectors. Crystal clear bio can contain damaging amounts of water. Used oil is illegally "polished" and sold into poor communities for cooking purposes in huge quantities. This product is carcinogenic. It's also commonly used to make paint and varnish.
  11. Generally glow plugs stay on (tell tale light off) for some time once an engine starts to reduce emissions. VW's typically only activate glow plugs once the ambient temperatures drop below 9C but they always activate for around 2 minutes on low engine loads when starting. DI motors start more easily than IDI and normally without needing glow plug activation.
  12. Just curious, is yours a Lister / Listeroid and is it IDI or DI?
  13. Well that was easy........You were DeepBass9 Well on a blend anyway. This led me to comment that Listers should never be run on SVO, just trying to add practical information which you appear to have been aware of anyway. As for blends in a Lister, I'm actually not sure about that either. It's about unburned droplets getting onto the cold cylinder wall and wetting the rings/ring lands where it eventually gums up and gets to look like the back and edges of a frying pan. It's the cold start and warm up period when these droplets don't burn and get onto the cold cylinder walls. Straight diesel atomises better when cold and "evaporates" off the walls/rings if it gets there, as the motor warms up. I don't know if IDI Listers are common in SA or if most are DI but I'm referring to DI Listers (should have been clearer about that)
  14. Flip, you want me to go back and find it .........okay but give me some time