Battery based tank circuit (tested)

**none** · 02-18-2004, 11:07 PM

"Conclusion" it is not, just your theory. To use your tactics against you, show me your "proof" that it doesn't work. I mean hardware (Keypower in this case,) not equations.

**Ricky327** · 02-18-2004, 11:53 PM

The Keypower is actually one of the PSUs shown to benefit from capacitor based tank circuits.

"One of" > you are even admiting the capacitor wont work on some setup, why? If the capacitor is so great why cant it work with any setup? Just because one guy got it to work on one setup it dont mean it will work on others. I do hope you realised by now why only some PSU can survive a crank with a small capacitor. If someone is using an inverter with a bad battery what will you tell them to use? a capacitor or battery?

If thats the sort of PSU he got then yes thats good for him if everything can be solved with a capacitor as you adviced. But Im not even gonna prove if that PSU can survive a crank or not in reality or theory because it already say on the thread it can operate down to 9V...most PSU just doesnt operate this low.

But dont you think these PSU designer should already be putting this capacitor in their circuit to survive the crank at the first place? Maybe its about time they realised this cranking problem, someone got to tell them that this where they been going wrong

**LESLIEx317537** · 02-18-2004, 11:58 PM

So far Opus is the only manufacturer (Big time) that advertises crank protection.

Anyone look to see if they got caps?

I'm gonna voltmeter my car during crank. I got thick wire, my car is brand new and nothing is wrong with the wiring. The only thing is I do have a dumb light switch toggle for power. That may be voltage drop.

But... also I built two carpcs recently that need crank protection. A PW-70A powered setup and mine. So I'm trying to kill 2 birds with one stone.

none, whats with you and this thing against people building tanks and stuff? You obviosly got a reason to hang around here if your PC is not rebooting since you have a Opus. Is there some insite you have besides running big thick wire? How many CarPC's have you built? I've built 3 so far and they all need some sort of crank survival.

**Ricky327** · 02-19-2004, 12:28 AM

none, whats with you and this thing against people building tanks and stuff?

It had something to do with this thread :

For those who tried the 1F tank!!!

Have a read

**none** · 02-19-2004, 01:48 AM

Originally Posted by LESLIEx317537

none, whats with you and this thing against people building tanks and stuff? You obviosly got a reason to hang around here if your PC is not rebooting since you have a Opus. Is there some insite you have besides running big thick wire? How many CarPC's have you built? I've built 3 so far and they all need some sort of crank survival.

I have two systems, both with Sproggy 2.8+, both having no problems surviving cranks. I have nothing against building tanks, I was merely trying to point you to some information relevant to your situation. I have always agreed that capacitor based tanks are useless for ITPS/PW70 use (or inverters for that matter) as this is just a poor PSU design to start with. As the manufacturer recommends in the ITPS manual, a battery tank is best in that situation. But capacitor based tank circuits have been proven to work with other DC-DC PSUs, including yours, and have size and simplicity advantages. Do what you will with that. Sorry for trying to help.

Ricky,

Obviously the Keypower needs some work, that's why the Opus is spanking it. (Go work for them and fix it

) And as I've told you before, it's not a voltage issue, it's a current issue.

**LESLIEx317537** · 02-19-2004, 11:10 AM

Yes, but the KeyPower puts out 250 watts while the Opus puts out 150 watts.

The Opus allows 5amps max on the 12 volt line. The KeyPower allows 12 amps. I got my touchscreen running off the PS and also a 7200rpm drive plus more. Can the Opus handle the load I throw it?

I may just buy a Opus if this is easier. No way am I gonna build the sproggy for 100 buks when I probably will never get all the parts. -Also how many amps can the Sproggy handle?

**Alessio** · 02-28-2004, 10:56 AM

Guys, can all this be done with a DC to AV inverter an a very small UPS? I am trying to avoid all this work, since I am not that good with advanced electic circuits (dont laugh, this stuff is advanced for me

Thanks

**LESLIEx317537** · 03-28-2004, 04:40 AM

I can survive cranks without a backup battery and I use a 250 watt Keypower. Read more here: http://www.mp3car.com/vbulletin/show...949#post180949

**zvi** · 04-02-2004, 09:23 AM

I just finished a setup of the proposed (first post) circuit with 8x1N5822 diodes, 5 watt 15 Ohm Resistor and 9Ah SLA Accu. I put 4 diodes per each line (on the diagram) to have capacity of 12 amp (may I will not need so much) to pass through

I did not test with PC, but multimeter shows:
With engine off: 12.35v
When cranking: 12.10v

Without tank circuit it is 12.35v/11.7....something

I am sure, PC will survive crank, but I am afraid with load, that PC will give, voltage drop will be more, waht do you think?

**Alessio** · 04-02-2004, 09:39 AM

Originally Posted by zvi

I just finished a setup of the proposed (first post) circuit with 8x1N5822 diodes, 5 watt 15 Ohm Resistor and 9Ah SLA Accu. I put 4 diodes per each line (on the diagram) to have capacity of 12 amp (may I will not need so much) to pass through

I did not test with PC, but multimeter shows:
With engine off: 12.35v
When cranking: 12.10v

Without tank circuit it is 12.35v/11.7....something

I am sure, PC will survive crank, but I am afraid with load, that PC will give, voltage drop will be more, waht do you think?

Too technical for me .... but there seems to be only one way to find out