Right due to a purchase of an additional Lynx distributor for a new battery bank my 70mm2 cables are too short.
So here goes I’ve moved my inverter Lynx distributor in the middle of what is the two Lynx distributors for the batteries what I want to do is balance the cable ie put one 70mm2 either end of the middle distributor fused ie one pair get 280amps per bank with a 300amp fuse each cable should be good for 485amps so fusing is with in spec just wanted to sound it out really hope this makes sense. PS cable length will be 2meters per cable and all four connected.
Oh wow not going to get two of those in the multiplus2 was hard enough to get one, probably just about get two 95’mms in there but all the flex able ones I’ve seen are rated at that was thinking the limit of 400amps for two Victron talks about was low when compared to the single 21mm2 flex from pylontech at peak 120amps.
Which isn’t relevant but the 100amp constant is from a cable with a lot less diameter?
So much easier with one battery bank
I’m not sure how these small diameter cables are rated so high
Just looked at a manufacturers website called Doncaster cables and there Tri rated 70mm2 is 259amps so @Ludo@MikeD yes we will be sticking to that 200amp per cable got to see if it can charge both banks up before off peak rate ends this is going to be close
The manual mininum sizing is 2x 70mm² (negative and positive)for up to 5m (return path) and free air. So you should be good with your cables for 200A over 3ach fullchat inverting all day. (Am assuming you don’t work the system like that anyway)
And no bigger cables do not fit especially if the insulation is a bit robust.
@lxonline I know I never go to the minimum standards lol the manual says 5 to 10 meters @70mm2 so combined combined neg and pos pair so I’m 4 meters still just in overkill as I like it lol Thanks
Cable ratings are normally determined by the maximum acceptable outer temperature. It’s no good if the insulation starts melting, or the cable can burn someone if touched. So the max current rating is affected by ambient temperature, the max cable temp and how much cooling is available.
I would put a busbar under the inverter, use 2 short 95mm^2 cable from the inverter to the bar (per pole), then connect the 120mm^2 to each end of the busbar to the batteries. Bar needs to be 25 x6.3mm copper.
@MikeD cheers mate the batteries are wired separately to each Lynx distro so each stack of four get there own pylontech cable. I would like to use 95mm2 to the inverter distro but it was hard enough with the two 70mm2 getting it manhandled in the inverter, I may still try though it’s all in free air and the UK doesn’t see any great temps thanks for sharing your knowledge must say second best thing about Victron is the forum
thanks for sharing your knowledge must say second best thing about Victron is the forum