OK. But please use Lucar or Faston connectors, don't solder to the switch.

 

 

You would use COM and NO for your pre-charge.

 

Just wondering if there's an actual need for a push button at all (I understand with the given lowish resistance given), but why not permanently wire in a 1K or so resistor 1/4W and a red LED? This will trickle charge the caps on the inverter, and all failure modes are accounted for:

 

- Short: LED is bright

- Resistor bypassed: LED fails open

 

If you're paranoid you can add a car fuse 5A or so.

 

Mind you for me 5V is the 'high voltage rail' so I may be missing something ????

 

You need to consider the magnitude of the caps in the inverter and any startup leakage current that the electronics takes. A resistor small enough to charge things up in a reasonable time would send your LED into low earth orbit ???? 

 

I have 50 ohms and it takes several seconds for my LED (with 4k7 in series across the resistor) to go out when the pack is up near 55V.

35 minutes ago, Crossy said:

OK. But please use Lucar or Faston connectors, don't solder to the switch.

 

 

You would use COM and NO for your pre-charge.

 

I was plan to solder, i need to solder on the terminal connectors on the battery cables also. Why not solder to the switch?

 

Pink

1 minute ago, Pink7 said:

I was plan to solder, i need to solder on the terminal connectors on the battery cables also. Why not solder to the switch?

 

IF you are quick with a big iron, then OK.

Remember it's got plastic innards.

13 minutes ago, Crossy said:

 

IF you are quick with a big iron, then OK.

Remember it's got plastic innards.

I did not think about that... Good Point Crossy!!

 

Pink

6 minutes ago, Pink7 said:

I did not think about that... Good Point Crossy!!

 

I've been soldering since I was 10 or so plus spent 3 years as an apprentice honing my skills.

 

Even now I've occasionally melted something that really shouldn't have melted.

 

Modern plastics seem to be less resilient than they were when I was a lad...

 

Case in point XT90 battery connectors.

By the time you've heated everything up to solder the wires the ruddy pins are flapping about in the melted plastic.

3 minutes ago, Crossy said:

 

I've been soldering since I was 10 or so plus spent 3 years as an apprentice honing my skills.

 

Even now I've occasionally melted something that really shouldn't have melted.

 

Modern plastics seem to be less resilient than they were when I was a lad...

I will check 2 mechanic friends  who live near me. They must have 4 of this connectors i guess.

 

Pink

5 minutes ago, Crossy said:

 

I've been soldering since I was 10 or so plus spent 3 years as an apprentice honing my skills.

 

Even now I've occasionally melted something that really shouldn't have melted.

 

Modern plastics seem to be less resilient than they were when I was a lad...

 

Case in point XT90 battery connectors.

By the time you've heated everything up to solder the wires the ruddy pins are flapping about in the melted plastic.

I soldered quite a few XT60 ( Building and flying Rc Helicopters and Gliders) Still not happy with the outcome of the soldering..

 

Pink