Getting ready to plan/build first install
OK so far.
I-Will XA100+ Mobo/K6-2 400 CPU.
128meg (will be sticking another 256meg in before the install).
30 gig HDD.
Currently a 24 speed CDROM for playing VCDs and MP3 CDs/Audio CDs, and for the Autoroute Europe (or whatever GPS software I use).
Matrox G450 DDR Dual Head (one of the best TVouts I've seen, and I don't need 3d for Gaming with that Processor)
Ira serial infra red reciever, and universal remote control with Girder (if I can get to grips with Girder command programming).
delou USB GPS for Sat Nav.
300 watt ATX PSU, plus Nikkei 300 watt Inverter.
logitech wireless keyboard and mouse for setting up.
Netgear WiFi card and PCi adaptor.
MM100PCTV (crap with most tuner/capture software, but works great with DScaler).
Hoontech Digital NX sound card.
Bought the MDF for the case build (going to grey carpetted to match the trunk floor).
I need to screen to finalise the components, was considering This 8.4" SBGA kit and add a touch screen controller. that of course is if they will ship internationally.
I've worked out the placement, and should be abe to get the components into a 14"x14"x6-7" pizzabox type install, including having the inverter inside the case (with room for Airflow).
I plan to have the inverter enclosed in the case, so the power switch will be hidden.
Rather than have to open the trunk, and case to power on, I had considered using a relay, operated by either an ignition fed live, or the Stereo remote line, to open and close the 12V feed from the battery to the inverter (stereo would be a better option as I'm going to be using an FM modulator (not transmitter) as I have no Aux in on the Hifi, so without the hifo on, the PC us useless for sound). Anyone with an inverter done anything like this?
initially it will be one (hopefully) VGA screen, but later I plan to add front passenger and rear seatback/headrest screen onto the TVout for VCD/DVD , with rear speaker output from the soundcard sent direct to the screen for use with Headphones, so as not to disturb my driving? Anyone done anything like this too?
Would appreciate any feedback on the idea of using the relay to operate the inverter.
Britain isn't the most tropical of countries, but should I be concerned about heat, when running the inverter inside the case? Could build in additional fans, but want to keep the current draw low.
I'm planning on using 12mm MDF for the base and top, and 6mm for the sides, the Inverter has the usual +- conections plus an additional earth, should I ground the PSU and the additional Inverter earth point to the car body because they are sitting on MDF rather than metal? The Mobo and cards will be sitting in a rescued Mobo tray.
Long post I know, but hopefully, I can get cracking on cutting the panels, and putting it all together this week, if the weather stays good.
About your relay to switch on the inverter. I will also be using that kind of construction. But in my case the file-system is mounted read-only, enabling me to switch off the PSU without having to shutdown the computer. Iím using linux and configured it so it does not need to write data to the HDD.
Switching off a computer without shutting it down or making special precautions might result in data loss. At least it will result in slowing down the next boot because the file-system needs checking.
I was going to have an Extended ATX power switch from the mobo to a concealed place on the dash.
I planned to put the relay into the power line from the battery, to the inverter, rather than use a relay to close the switch on the inverter. that way the inverter can be left on permanently, but doesn't recieve current till the radio is switched on.
Just need to get straight in my head how I will wire the relay.
I'm also using an inverter switched by a relay.
But i'm not switching the wires from the batery.
I took out the on/off switch on the inverter and wired this to the relay that is switch on by a button in the front of the car.
This is because you need a very big relay to handle the big curent that is drawn from the batery.
surely a decent 30 or 40 amp headlight relay would be sufficient for the inverter?
I see what you are getting at though.
Just a thought, could you use multiple relays in parallel, to spread the load, if it is greater than one relay can take?
Just checked a few calculations.
With a 12V 300Watt inverter I should be pulling 25 amps.
As I'm using a 300watt ATX PSU, i shouldn't be pulling more than that.
The Inverter can surge to 1000watts, so that might cause probs, as it needs 83 amps load. That would need 3 relays if they could be wired in parallel.
A very useful electrical calculator
My DC-DC PSU draws about 25W to provide my system with the 18W it needs.
Well anyway, putting a relay in the power line to your inverter works fine. But placing it instead of the ON/OFF switch is a nicer solution (nicer, not better, nor worse).
Itís true that relays, used in cars, are made for big currents. But I think itís better to measure the current your inverter draws, with all the equipment connected to it and powered on. This way you can choose the right relay. Please note that when measuring a current of 5A, the inverter might draw 10 A when powering on, for a very very very short time.
And If you really need that 83A you can always decide to use some relays parallel or to get one really big one.
Please donít forget to use a fuse between the inverter and your battery, unless your inverter is equipped with one already.
The 1000watt is the max surge rating of the inverter.
nice to know if I was to stupidly plug something in that used maga wattage, it wouldn't just packup and blow.
Please also be aware that your ATX PSU is capable of delivering 300W to your computer. But Iím certain that your computer will not be consuming that much.
I think 100W is a lot.
Another thing: A 300W PSU draws more than 300W when delivering 300W, the efficiency isnít 100%Ö..