Cap banks - the pre-emptive answer

[drwayne]

Question on soldering caps, ok.--- I noticed my turnigy 120 caps were 390-35v which i think are to small. I took the 2 caps off and replaced with 470-35v but my question is , can i twist 2 cap + wires together and solder to + side of esc. Next take the same caps-2 wires and twist and solder to - side of esc . Info asap before i use esc. To hot today for boating 93+ oh yes thanks.

Yes... so long those 'twisted' leads make sufficient contact the esc input rails, thats ok.
Do make sure the replacements are low esr with high temp survivability else they'll be 'rooted' very quick.

[ray schrauwen]

Thanks Wayne. When bro gets back from Phillipeans I'll ask him to help me out with the values and bounce your info off his.

Sounds good. What brands have you played with or think would be sufficient? I know he has used WonderCaps with audio PS's in the past but, I never kept an ear of what he's been using the last 10 years.

[maxmekker]

So today I got my small caps in the mail.
I got some 22 / 47 / 101 /221, they did not cost a thing.

I also got an answer from support at hobbyking, were I was asking the value on those small ones. The reply was that I could replace them with caps with 30v.
Since I don't know much about caps I thought maybe they were talking about the big ones, wich I'm replacing withe the ose etti cap bank anyway.
So I sent a mail to were I bought the small ones,asking the V range and heat range, but they have not reply's as of yet. Maybe some of you can help me out (wayne)
before I start soldering.

Also, can I cut the 'legs' to make them shorter ore will it affect the value/performance of the cap ?
Should I replace all with new ones, ore can I just try changing the damaged one first ?

The etti bank, best to fit it onto the esc ore can I have a short wire between? Not sure I have the head room in the geico if I solder it onto the speed controller.

thanks

[drwayne]

Hi
The original capacitors were rated as ?uf and ?V
HK have suggested you use 30V with original uf .. this is what I understand from your post here
The etti caps are a good replacement for the originals.. forget what HK have said !
The etti cap bank circuit board has holes for +ve and for -ve power wires.. make the esc wires go through that hole.. trim some cover from each wire so you can solder to it... use the wire that goes through the board to connect to battery.
Keep the cap bank close to the esc.. within 30mm is best.
"small" esc like the T180 will work okay with the onboard replaced by a much larger external bank

Id not like to see this 'cheat' on high voltage or high A esc as this creates issues with emf

regs
Wayne

So today I got my small caps in the mail.
I got some 22 / 47 / 101 /221, they did not cost a thing.

I also got an answer from support at hobbyking, were I was asking the value on those small ones. The reply was that I could replace them with caps with 30v.
Since I don't know much about caps I thought maybe they were talking about the big ones, wich I'm replacing withe the ose etti cap bank anyway.
So I sent a mail to were I bought the small ones,asking the V range and heat range, but they have not reply's as of yet. Maybe some of you can help me out (wayne)
before I start soldering.

Also, can I cut the 'legs' to make them shorter ore will it affect the value/performance of the cap ?
Should I replace all with new ones, ore can I just try changing the damaged one first ?

The etti bank, best to fit it onto the esc ore can I have a short wire between? Not sure I have the head room in the geico if I solder it onto the speed controller.

thanks

[maxmekker]

yes sir. The new small ones, I still waiting on reply as to if they are above 30v. Hope so :-)

you told me a 47 pf would be enough on that 180 some post's back, I asked Hobbyking but they use 5 day's answer so I just got some, then they answer,and say 30v ore above :-) I will see tomorrow if the caps I got are usable.

[drwayne]

Hi
The 47pf are toreplace the surface mounted caps that were damaged in one the pics above.. you still need the larger capacitors... although the etti cap bank can serve in their place...
you will still need the 47pf on the esc board to aid the system.
W.

yes sir. The new small ones, I still waiting on reply as to if they are above 30v. Hope so :-)

you told me a 47 pf would be enough on that 180 some post's back, I asked Hobbyking but they use 5 day's answer so I just got some, then they answer,and say 30v ore above :-) I will see tomorrow if the caps I got are usable.

[drwayne]

etti banks use 35V 1000uf x 6.

[maxmekker]

So it's ready for testing. Not exactly nasa stuff but it should hold up. The etti board was just a tad narrow to fit on my 180 board so I had to make some wires.

[1945dave]

DSC_0642.jpgDSC_0641.jpg

Question: I plan to add cap bank to Seaking 180 ESC, I bought this one: http://www.offshoreelectrics.com/pro...i-e041&cat=136. The recommended installation is to open up/strip the power wire near the base board and solder the + and - notches onto the wire. That will be difficult in my case, can I open up the power wires at the same location but instead solder two short ( very short , no more than 30 mm) wires and then attach them to the + and - notches on the cap bank?

Attached are photos of the newest version of the T-180 as I recieved it just a few weeks back. It now includes this little external bank of 4 capacitors wired in series across the battery leads. Notice the small gauge wire.Don't know what this brings to the table but my other T-180's do not have this bank.

Dave

[ray schrauwen]

They sell a 63V version that Maxmekker installed. Maybe a typo Wayne or do they have a 35V version too??

etti banks use 35V 1000uf x 6.

[ray schrauwen]

Looks more like parrellel to me unless you took off the heat shrink off the caps???

[ATTACH=CONFIG]83945[/ATTACH][ATTACH=CONFIG]83946[/ATTACH]

Attached are photos of the newest version of the T-180 as I recieved it just a few weeks back. It now includes this little external bank of 4 capacitors wired in series across the battery leads. Notice the small gauge wire.Don't know what this brings to the table but my other T-180's do not have this bank.

Dave

[ray schrauwen]

It looked like it was going to fit.... but, should work the way it is. I'm sure you will insulate the bare wires??

So it's ready for testing. Not exactly nasa stuff but it should hold up. The etti board was just a tad narrow to fit on my 180 board so I had to make some wires.

[tlandauer]

I think it is wired in parallel, the small gauge wire suggests the maker does not bother to go the extra mile to include higher wire ga. However, as drwayne said earlier, efficiency is the main goal, I used 12ga wire to attach the cap bank, looks just like what maxmekker did to his T180. I did however replace the three caps that were originally on the ESC with identical ones bought here @ OSE.
I ran the same set up and everything was cool, the cap bank was barely 100* and so were the three caps on the ESC, the boat however suffered a flip and is down for the week while I do repairs to the FG hull, will report back, so far running with the added cap bank has really cooled things down.

[maxmekker]

It looked like it was going to fit.... but, should work the way it is. I'm sure you will insulate the bare wires??

just with some tape now. 2 set's of lipo's charged, and if it works, temps/speed etc are good, I will sit down and do a better job. soon to cold and dark here in Norway to do boating anyway,( when sept hit's it's like a switch, chilly and early dark)
but I have some fresh 65-130c 5000 lipo's just in the door I want to try out.

[drwayne]

They sell a 63V version that Maxmekker installed. Maybe a typo Wayne or do they have a 35V version too??

A diff branded 35V, sorry.
However, I'll cover my ass by saying I subconsciously intended to say cap voltage +20% of packs is best for power circuits.

just with some tape now. 2 set's of lipo's charged, and if it works, temps/speed etc are good, I will sit down and do a better job. soon to cold and dark here in Norway to do boating anyway,( when sept hit's it's like a switch, chilly and early dark)
but I have some fresh 65-130c 5000 lipo's just in the door I want to try out.

If it's cold outside, make sure your packs are warmed to ~body temp. makes for much better performance and longevity your packs.
W