Question 1

can i use with speakers

Accepted Answer

Most speakers are passive (they get power from the Amp) but if yours need a 12v DC supply for some reason then I don’t see why not if wired correctly. All depends on the speakers you’re trying to use. More info required!

Question 2

This (150w version) does get almost too hot to touch under 130w load, is this normal ?

Accepted Answer

Afraid I`m not an electrician but from what i know you need to work out how many watts you need and then allow around 20% more to work out which transformer you need otherwise it may be overloaded and eventually stop working. If yours is getting very hot then i would guess it is very near its limit. I have 2 of these running around 100w each and i have had no problems with them getting hot. Hope this helps

Question 3

Well this run a3to 5 kw derv air heater

Accepted Answer

Do you mean something like a diesel fuelled Eberspacher/Planar/Webasto type of air heater, usually used in vehicles? (derv is another word for diesel in the UK)
If so, the 3-5kw is the 'output' heat from the combustion of the diesel. They use relatively little electrical power for that heat output. You should check the serial plate on your heater, as they will usually state electric power consumption. 
The Eberspacher D5 air heater outputs 5.5kw of heat at max power, and only uses 80w of 12v electricity at the max power setting. So, this 12v 150w supply should give you plenty of headroom to power the D5 from mains power.

Question 4

What's the best cable to use to extend from this transformer to my lights (10m away)? I think I may have blown the cable I was using..

Accepted Answer

As your stating from the transformer, I'm assuming the 12V DC output (and not the mains input).

After some really odd responses here, thought I'd jump in. You do not need 16mm cable ( suspect the person meant 16 wire gauge which is fine), running 12v over 10m will result in a small drop for sure, but it depends on what tolerance the lights are but I suspect you will not notice anything. All you need is a simple 2 core (1mm should be enough but if you want to be safe 1.5mm is plenty) flexible cable to deliver this, the transformer has short circuit protection but would do no harm to add a small fuse but remember you're not running mains 240v, but 12v so search for car fuses, should give you a clue and then based on your lights, select a suitable fuse.

ASIN	B07JP15KTG
Amperage	12.5 Amps
Best Sellers Rank	31,339 in Lighting ( See Top 100 in Lighting ) 218 in Low-Voltage Transformers
Box Contents	manual
Brand Name	Idealyuan
Colour	12V 150W
Connector Types	3-prong plug
Customer Reviews	4.1 4.1 out of 5 stars (129)
Enclosure Material	Aluminium
Form Factor	compact
Input Voltage	260 Volts
Item Dimensions	18.7 x 6.7 x 2 centimetres
Item Weight	544 g
Manufacturer	Idealyuan
Manufacturer Part Number	12V 150W
Maximum Power	150 Watts
Model Number	12V 150W
Output Current	12.5 Amps
Output Voltage	12 Volts
Output Wattage	150 Watts
Specification Met	CE, RoHS
UPC	705419543710
Unit Count	1.0 count

150W 12V DC LED Power Supply, IP67 Waterproof Low Voltage Transformer LED Driver Adapter, 100-260V AC to 12V DC Converter for LED Strips, Outdoor Lights, CCTV Cameras & More

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