Spare parts (help needed)

[testdruif]

Jan 6, 2014 15:08:59 GMT Super-Shiny said:

Thanks testdruif i will drop the fuses, less work for me

Just make sure to properly solder and then isolate your wires and connections (tape, shrinkwrap, glue,...)
I don't want an angry romelee at my doorstep when the thing blew up in your hand because a connection got loose

Final advice would be to isolate everything from the body (as it's aluminium).
put glue, a piece of tape, anything between your components and the body unless it's a part made out of plastic and not used in any way for power running through it

[raid2506]

My actual point about the fuses is that in the configuration shown they are both redundant.

If a fuse was used then it should be on the single leg of the 'Y'.

[testdruif]

Jan 6, 2014 15:16:19 GMT raid2506 said:

My actual point about the fuses is that in the configuration shown they are both redundant.

If a fuse was used then it should be on the single leg of the 'Y'.

indeedy

[Super-Shiny]

raid2506 testdruif

[testdruif]

Jan 6, 2014 15:27:03 GMT Super-Shiny said:

raid2506 testdruif

It looks like the second picture isn't a complete circuit. only wires on the left connector...

The first picture I wouldn't bother with 2 fuses, as the description says "Solder the legs of the fuses together in parallel."....
why if you have a short then both fuses will blow out so is it to have one fuse with a higher resistance? if so, why not just use 1 fuse with a higher resistance

[Super-Shiny]

Jan 6, 2014 15:33:26 GMT testdruif said:

It looks like the second picture isn't a complete circuit. only wires on the left connector...

The first picture I wouldn't bother with 2 fuses, as the description says "Solder the legs of the fuses together in parallel."....
why if you have a short then both fuses will blow out so is it to have one fuse with a higher resistance? if so, why not just use 1 fuse with a higher resistance

Not sure but this is from the guide:

Fuses i have are: 3A Radial Leaded PCB Mount Resettable Fuse, 30 V but she used  PTC resettable fuses 16v, 3A (look like the only difference is hers is 16v and mine are 30v)

[testdruif]

www.zbattery.com/Connecting-Batteries-in-Series-or-Parallel

2 batteries in series = higher voltage
2 batteries in parallel = more mah, same voltage

So putting 2 16v, 3amp fuses in parallel (Fuses in parallel summate if wired correctly)

So you'll have a 6 amp fuse.
so you are limited to an inputof 6amp and then your fuses blow.

The evolv datasheet says:

Battery:
A single cell rechargeable lithium chemistry battery is recommended. Either a lithium ion or a
lithium polymer type can be used. Any battery used should be rated for a MINIMUM of 7 amps
continuous discharge current. High C rated lithium polymer or IMR cylindrical cells are strongly
preferred.

So if you would take full advantage of the board you're fuses will blow anyway?
Max input for the dna20 mod is 7amps, max output 6amps

[Super-Shiny]

testdruif sorry to be a pain but that went right over my head

In very easy terms, i have that battery holder on order and on it's way to me, if you was going to make this mod how would you go about doing it.

In very easy terms of wording it as my brain is now completely frazzled

[testdruif]

so to quote myself

Either get 1 fuse rated for 7 amps (maximum amps the board can handle)

or lose the 1 amps that you may never ever every need with your current setup (2 fuses in parallel)

[testdruif]

Jan 6, 2014 15:51:52 GMT Super-Shiny said:

testdruif sorry to be a pain but that went right over my head

In very easy terms, i have that battery holder on order and on it's way to me, if you was going to make this mod how would you go about doing it.

In very easy terms of wording it as my brain is now completely frazzled

in your case (with the fuses you have and batteries in parallel) taking into account the amps required according to the dna20 datasheet:

If you are going to use those fuses make sure you put them both in parallel (so you get to a 6amps limit). I recon the 1 amps you're going to lose won't matter much unless you are going to work it and work it hard

If you want the added security of a fuse, put that fuse (those 2 you have and that are in parallel) at the end of your positive wires (as raid mentioned).

[Super-Shiny]

Cheers testdruif now that i can understand and after reading your posts more and more it's all sinking in now.....i need a lie down

[testdruif]

In the end we're just trying not to make a pipe bomb

so the maximum input of the dna20 board is 7amps, if you are going to use that amount of current I'm wondering if your atty will melt or not

[raid2506]

Just to add some more aggro to the mix....

Your fuse Amps rating has to be BELOW the maximum safe current of the circuit to protect it, e.g. 7A circuit 6A fuse.
I have not been able to ascertain the safe maximum Amps for the DNA20?
The fuse voltage needs to be ABOVE the maximum voltage of the circuit so 16v or 30v is ok

Two fuses in parallel do not give double the rating of an individual fuse, if you double the rating and deduct 15% you should be close.
Based on the fact that the tutorial you are following shows Li-Po batteries wired in parallel and charged via USB I'm not convinced the author has done the proper Pre-arc or total current/time calculations.

The Evolve data sheet also specifies a single cell of above 7A but the tutorial seems to suggest multiple cells at 7A max and fused accordingly?

There seems to be much confusion as the whether the fuses are supposed to protect the Li-Po cell or the DNA20 circuit?

[raid2506]

Jan 6, 2014 16:14:31 GMT testdruif said:

In the end we're just trying not to make a pipe bomb

so the maximum input of the dna20 board is 7amps, if you are going to use that amount of current I'm wondering if your atty will melt or not

If I read it right the DNA20 needs 7A minimum, not max?

[testdruif]

Jan 6, 2014 16:55:04 GMT raid2506 said:

Jan 6, 2014 16:14:31 GMT testdruif said:

In the end we're just trying not to make a pipe bomb

so the maximum input of the dna20 board is 7amps, if you are going to use that amount of current I'm wondering if your atty will melt or not

If I read it right the DNA20 needs 7A minimum, not max?

I've checked the datasheet again:

Input Current 1.5 Amps (minimum) 4.0 Amps (average) 7 Amps (max)
It says any battery should be rated 7amps minimum