Bowthruster Electrics Supply

[Solent sailer]

I haven't read any spec on the model being fitted, 1x95sqmm 2x 70sqmm in parallel, 1x120sqmm all valid options. I recall some concerns over the main battery bank supplying the bow thruster should that battery be flat so large cables would need to be installed just in case.

I did suggest 120sqmm cable but you seem to have not read that - perhaps you have the same problem as me? I haven't seen a length but perhaps you have found a way to calculate volt drop without this

I understand you are familiar with this type of install and have your preferred methods, I am familiar with installing supplies up to and including 1250amps 3 phase so thought I would offer what I consider to be a more professional (from a commercial/industrial point of view). I am sorry if I have offended you by offering another method that doesn't coincide with your ideas.

From my view point a short run of cable, 10m max? I would have no problem installing a couple of cable or one large cable, from my point of view it is easy and there is nothing to go wrong. Fuses at both ends of a cable in a damp environment is just anther way of getting problems. Spending money on a different charge system just to fit a bow thruster when you already have one?

As for batteries I am passing on a comment from Merlin electronics, the UK wiring regulations (shore regulations but still a useful reference BS7671), the instruction on my last flooded lead acid battery and our current battery charger. "only charge batteries in a well ventilated area with no sources of ignition". I was assuming this would have an enclosed saloon/cabins?

As we are just going disagree on this I will leave this you the "Expert" to comment as this is becoming offensive and not much help the OP.

I expect you will feel it necessary to point out that I am completely wrong with which ever bits you chose to read, be my guest I wont be reading it.

 

[PaulRainbow]

I haven't read any spec on the model being fitted, 1x95sqmm 2x 70sqmm in parallel, 1x120sqmm all valid options. I recall some concerns over the main battery bank supplying the bow thruster should that battery be flat so large cables would need to be installed just in case.

If you don't know the spec of what's being fitted, how do you know what cables to use ? 95mm is not valid, it's too small. 2x70mm is recommended for up to 14m and 2x 95mm for over 14mm. 120mm is the minimum for up to 14m, so also inadequate.

I did suggest 120sqmm cable but you seem to have not read that - perhaps you have the same problem as me? I haven't seen a length but perhaps you have found a way to calculate volt drop without this

I commented on post #50, no mention of 120mm cable, you said "Why not simplify things and use your main battery bank, how big is the boat? just run 95mm cables to the bow thruster, it wont be any heavier than a extra battery and wont be any more expensive than battery/charger/VRS or Relay and wont be adding weight in the bow "

A single 95mmcable is half of the manufacturers recommended cable size.

Posts #32, #35, #36, #37, #39, #40, #41, #42, #43 and probably some others all discuss the cable length.

I understand you are familiar with this type of install and have your preferred methods, I am familiar with installing supplies up to and including 1250amps 3 phase so thought I would offer what I consider to be a more professional (from a commercial/industrial point of view). I am sorry if I have offended you by offering another method that doesn't coincide with your ideas.

Yes, i'm familiar with this type of installation, my preferred methods are to do the job properly, so the equipment works as it should. I fail to see how recommending the use of cables half of the recommended size is "more professional".

You have not offended me. Your offer of "another method" does not coincide with what is required, nothing to do with my ideas.

From my view point a short run of cable, 10m max? I would have no problem installing a couple of cable or one large cable, from my point of view it is easy and there is nothing to go wrong. Fuses at both ends of a cable in a damp environment is just anther way of getting problems. Spending money on a different charge system just to fit a bow thruster when you already have one?

Running cables to the bow has been discussed and is a perfectly valid option, providing the job is done correctly, such as using appropriate cables.

As for batteries I am passing on a comment from Merlin electronics, the UK wiring regulations (shore regulations but still a useful reference BS7671), the instruction on my last flooded lead acid battery and our current battery charger. "only charge batteries in a well ventilated area with no sources of ignition". I was assuming this would have an enclosed saloon/cabins?

Almost every production boat that i'm aware of has batteries in some part of the accommodation or other, where else would they be, out on deck ?

As we are just going disagree on this I will leave this you the "Expert" to comment as this is becoming offensive and not much help the OP.

The only person becoming "offensive" is you, with suggestion that your way is "more professional". Perhaps it's acceptable to instal 3-phase cables of half the recommended size, although i doubt it.

As for disagreeing and your "expert" snipe, i'll once again remind you that everything i (and most others) in the thread have suggested, including running cables to the bow, have been in accordance with the manufacturers recommendations and overall good practice.

I expect you will feel it necessary to point out that I am completely wrong with which ever bits you chose to read, be my guest I wont be reading it.

It's often necessary to point out errors, particularly where they involve suggestions of using under rated cable.