24DC Charging question

[geem]

Both work fine

But one system needs twice as many lead batteries and way of charging them, and dealing with a fault

 

[Blue Seas]

But one system needs twice as many lead batteries and way of charging them, and dealing with a fault

I really don't see that as an issue, indeed I see it as a plus. The two banks combined are about correct in terms of capacity for what power storage I want so I would carry them anyway, we are 35 tons displacement so no issues with weight either, and the fact that they are split and have separate chargers is a standard redundancy back up that again I would build in even if we did not have an electric thruster (I insist on two independent ways of doing things and prefer three if reasonably feasible).

The furlers and main winches are electro-hydraulic (with an engine driven back up hydraulic pump) so I would still need back up 24 volt capacity even if the bow thruster was hydraulic.

I don't see ripping out a perfectly serviceable thruster and replacing with hydraulic (at huge cost) as being a solution to an emergency cross connect switch!

I see that EnergyMonkey do a complete Victron Orion 50amp kit pre-wired and crimped for just over £400 with 10 meter length so that is a possible solution.

 

[geem]

There is so much resistance in lead batteries that just fitting an emergency combiner switch would solve the flat battery problem

 

[PaulRainbow]

I see that EnergyMonkey do a complete Victron Orion 50amp kit pre-wired and crimped for just over £400 with 10 meter length so that is a possible solution.

But that's 12v.

You're making a meal of this, (but not alone).

A pair of 16mm cables, fused both ends, with the positive connected to a busbar at the supply end, then the mains charger and an Argofet output will keep them charged. Take a cable from the busbar to an isolator switch, with the other terminal connected to the load side of the domestic isolator switch. If the domestic bank fails, turn the isolator off and turn the emergency switch on. Domestic services will then be powered by the bow bank. This is all dependant upon 16a cable being big enough for your domestic loads.

If you want to permanently combine the two banks you would need to use 50mm cable.

 

[Blue Seas]

But that's 12v.

You're making a meal of this, (but not alone).

A pair of 16mm cables, fused both ends, with the positive connected to a busbar at the supply end, then the mains charger and an Argofet output will keep them charged. Take a cable from the busbar to an isolator switch, with the other terminal connected to the load side of the domestic isolator switch. If the domestic bank fails, turn the isolator off and turn the emergency switch on. Domestic services will then be powered by the bow bank. This is all dependant upon 16a cable being big enough for your domestic loads.

If you want to permanently combine the two banks you would need to use 50mm cable.

Thanks, makes sense, that is exactly what I will do.
Thanks again.

(Wood, trees etc.)