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Everything posted by Muhendis
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Not been a good time for batteries recently.
Muhendis replied to Crossy's topic in Alternative/Renewable Energy Forum
Accompanied by colourful language too I expect because something didn't go quite according to plan. Physical damage of that nature rarely causes harm (to the battery). The problem is internal within the battery. If you are interested you might like to Google up "dendrites". They are the enemy but not the only one. -
Not been a good time for batteries recently.
Muhendis replied to Crossy's topic in Alternative/Renewable Energy Forum
You are concerned about e-vehicles? They are relatively safe by which I mean they are now all LiFePO4 powered. Thermal runaway starts at about 250oC internal temperature. Power tools on the other hand are NMC powered (NMC is a type of lithium battery) and the thermal runaway temperature is in the region of 170o C How many cordless power tools do you have? We don't know what type of batteries were in the container but power tool batteries are all over the place. -
Thailand reduces school hours in major curriculum overhaul
Muhendis replied to webfact's topic in Thailand News
Unfortunately being in Thailand as long as I have doesn't necessarily mean I would have knowledge of what goes on in the educational system hence my question. Of course, you're right about the lack of educated craftsmen but that's due mainly to potential craftsmen, especially in the rural areas, not attending any formal tuition classes. Let us hope for a change for the better. -
Thailand reduces school hours in major curriculum overhaul
Muhendis replied to webfact's topic in Thailand News
Following on from the comments about including technical subjects I have a question for all you educators out there. We, in the UK, had such lessons as woodwork, metalwork and technical drawing as well as the three R's. Is this not something schools do in Thailand? -
It's you that is banned not the passport. As others have said, name, date of birth, biometrics etc. you will be recognised and not admitted.
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Dentist in Buriram/Korat to improve Denture fitting /do implants
Muhendis replied to notrub's topic in Health and Medicine
There is a very good dental hospital in Buriram. It is on Jira road opposite the central police station. No appointment needed but best get there earlyish. -
Apint is a liquid measure which is 0.00057M³ or 2.4x10-6 of the volume of a london bus.
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Chang CU Breakers differences besides Amp rating?
Muhendis replied to Mike45's topic in The Electrical Forum
And a college course in domestic electricity installation. I think what Crossy is saying is you really shouldn't be trying to interpret that which you don't understand. -
Do you have to wear a towel during a massage?
Muhendis replied to Conan The Barbarian's topic in ASEAN NOW Community Pub
If the massage is done by a reasonably gorgeous woman then a towel is a polite start. If, on the other hand, it's a wistful male, then for me, it has to be a large size chastity belt. -
Thailand’s carbon tax: Battling climate change, but at what cost?
Muhendis replied to webfact's topic in Thailand News
Will the carbon tax have a refund option to allow tree growers, like myself, to reclaim against all the tonnes of carbon they are removing from the air? Or is it just a one way street? -
Yep. Your link pretty well confirms the species Hrastova sjajnica. Brilliant and thanks.
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I found this growing in my mini forest the other day. I asked my Thai wife what it might be and her reply was "Dangerous". Can anyone recognise it and put a name to it?
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Pattaya deputy mayor slams contractors with record fines
Muhendis replied to snoop1130's topic in Pattaya News
I don't think it is entirely the mayors fault. The Comptroller General’s Department is part of central government. -
Temporary electric wires across our land. Is it safe?
Muhendis replied to advancebooking's topic in The Electrical Forum
Do I understand this right? There is a white wire run from the meter on bamboo poles. I assume the white wire is domestic house wire. This is unsatisfactory if exposed to the elements for an extended period (a few years). What is the cable protection at the meter? Assuming the white wire is two core 2.5mm², there should be a fuse at the meter end not exceeding 20 Amps. The fuse will ensure the wire won't get too hot in the event of a short at one of the connections etc. Mind you, if there is a catastrophic fuseless shorting event the PEA supply will be sufficient to vaporise the cable. -
Concerns rise as Chao Phraya River bank collapses
Muhendis replied to snoop1130's topic in Bangkok News
And a few rolls of duct tape. -
Concerns rise as Chao Phraya River bank collapses
Muhendis replied to snoop1130's topic in Bangkok News
How can you maintain something that was not built properly in the first place? -
PEA requesting everybody to register
Muhendis replied to manolothai's topic in Alternative/Renewable Energy Forum
So it sounds like a fast feedback loop to monitor the inverter output cycle by cycle would be required to control this instability as I understand it. -
PEA requesting everybody to register
Muhendis replied to manolothai's topic in Alternative/Renewable Energy Forum
It strikes me that this "Ghost power" is a design shortfall. If zero export is called for then why not incorporate a mechanical device like a control relay to isolate the inverter. These inverters are getting exorbitantly expensive so they should concentrate a bit of resource on Ghost power elimination. Perhaps call in Ghost Busters (did someone already think of that?). -
PEA requesting everybody to register
Muhendis replied to manolothai's topic in Alternative/Renewable Energy Forum
I am not grid tied except through the ATS. ATS priority is 1st solar. 2nd PEA. Mine is a single phase ATS. If I have a need to use PEA at any time, all I have to do is disconnect my inverter output and the ATS will automatically switch over to PEA. Transfer time is between ½ second to 1 second. How does the ATS work? There is a relay permanently energised by priority 1 input. Relay contacts are arranged to connect rectified AC power to a small motor which controls, via a mechanical linkage, two mcb's in an OR logic way. If power is off from the inverter then the relay is de-energised, the motor runs one way and switches the mcb's over. If power from the inverter is put back on then the relay is energised and the motor runs the other way to switch the mcb's back to priority 1 input. The mechanical linkage is arranged so that it is impossible to have both mcb's in the same state.