Battery switch - Double pole - single throw - 150amp ?

[Fingers]

In the manual it also states 150amp breaker, not shown in diagram.



Yep resistance is a problem, always been the same with fuses, but when something goes wrong I for one will be glad of the breakers & fuses. This kit cost enough money to buy, I want it bullet proof now so I don't have to replace it in the future.

New Sunsynk LiFePo4 batteries (100ah 48v) will come with breakers built in, and I have seen other makes like this.
So I haven't deviated at all from the plan above with new batteries, other than using 2 sets of cables.

 

[Fingers]

None of the ones I've seen have a big red cartoon button.
All of this is overkill and only introduces additional points of resistance and failure.

I have been thinking, and you have a point.
Why have a switch when each battery has it's own switch. Also the manual diagram it shows a lead acid battery, which obviously have no switches.
If a panic switch were to be used, would it damage the inverter anyway? Shut down procedure should be AC first.

Ok lets ditch the switch.

Lawson fuses were surprised T fuses were being used as protection for batteries, as they were meant for items such as inverters. So thinking about it, to protect the inverter two fuses (for balance) positive and negative would do.

Ok that's got rid of two fuses.

I think I have got the wrong size breakers and fuses anyway.
Why fit a 150amp fuse or breaker when the inverter can only kick out 120amps?
Why fit a 100amp battery breaker, when 100 amps into an individual battery will damage it. Surely an 80amp breaker per battery would be better, so if one breaker trips out, on a 100amp charge the other 80amp breaker will also trip out, saving any damage.
As the batteries will no longer receive anywhere near 100amps I can now use just the one set of cables.

Hows this look:
Inverter, 50mm2 cable, two 125amp fuses, 50mm2 cable, two 80amp breakers, four 25mm2 cables to batteries.


What do you think? Nanque breakers any good?

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What would you choose, 63amp (a bit too low?) or the 80amp breakers?

I can't believe I bought 100amp for this job, doh.