i have 4 caps (35v 330uF) to add onto my ESC's, 2 per esc to make up 4 caps on each, i know i can solder them to the PCB or add to the power in leads but was thinking of buying some PCB and soldering them onto the board side by side then adding them to the power in leads near the exsisting caps

can it be done this way? as just added to power in leads does'nt seem very secure to me

Like this?:

hey backem

i get a bank like that and its gonna cost me £18, thats why i went with the caps i have,  could buy it if i want but wanna try it this way first

You can, but they need to be "Low ESR" or low electrostatic resistance capacitors. Common capacitors aren't as good.
Keep the wire distance to the ESC to a minimum.

Why not pot it all in epoxy to keep the water out, and the capacitors secure ? Test first, under full power for long enough to know nothing's going to fail, and then wrap in fibreglass cloth, cover with masking tape, seal one end fully and pour epoxy resin into the other end.

Got mine for $15US each at Hi-Model.com... out of stock at this moment though....

They are massive Rubycons, 1000uF each, low esr's...

Alot of the esc's like yours don't even have low esr caps if you look. Some doo, many do not. They still work until they detinate the esc in your boat.

Ask me how I know....[:'(]

this is the cap bank i want to use but i'm unsure if its ok, the caps on the esc are 35v, 330uF

That'll do fine Nick. Or you can make you own - you were thinking right. You can make a separate board or just solder them to the leads or the pcb. It'll all get the job done! I've even thought of cooling them - but really if they are getting too hot, there is something else amiss that needs attention.

the the caps on the esc are'nt getting hot, i just want to increase the efficency and life span of both the esc and batterys

i have the caps and some 14gauge wire that i have put the caps into the wires but i'm going to solder the wires to caps for security, i've already watercooled/proofed my speedo so im going to solder the wires directly to the esc wires or i may just buy a new esc and start again from scratch

i am assuming to solder as close to the esc i can?? i read somewhere that some guys soldered them to the deans connectors but i use a series harness with 6mm bullets so i can change the harness for a single lead