Fuses & Cables.

[PeteMallorca]

Power will be coming from 3 200ah 12v Lifepo4 batteries, in parallel. Through a Victron Lynx Distributor.

There will be:

3 x Blue Sea Systems 300 Amp 48v m-Series Battery Switches.

A 12v, 12 way, fused distribution board.

A Victron Cerbo GX.

A Victron SmartSolar MPPT 150 l 60 Tr.

A Solar disconnected or dc circuit breaker.

I want to have the 3 Switches here because I can isolate each circuit, as and when I want or need to.

The cable from the lynx (To house 12v in image) to the the first switch will enter the switch and then continue to the second switch. The output of the first switch will pass through a 50A Victron megga fuse, to supply the original dc distribution box. I am thinking to use 35mm² because the original distribution box will be about 6m away and the electrical diagram for it shows a 50A fuse from the house battery.

The output from the second switch will pass through a 100A Victron megga fuse, to supply the new dc fuse distribution box. I am thinking to use 35mm² again because its rating is 100A but its only about 0.25m Away from the switch.

The cable into the third switch is coming from the lynx (From MTTP in the image), and the output will supply the SmartSolar. I am thinking that the cable will continue as the largest cable that the SmartSolar will accept. It will be about 0.25m away.

The Solar disconnected or dc circuit breaker will be next to the SmartSolar and the PV cables will enter through the roof, directly above it. I am not sure which is the best option, any suggestions welcome,

I guess that I will have to wait until I buy the new panels, to know what amperage or voltage that the Solar dc circuit breaker will need to be. Maybe not such a problem if using a solar disconnect? I am looking seriously at 2 of these panels.
2 x 24v 545W JA Solar Mono PERC.
(PMAX): 545W
(VMPP): 41.80V
(IMPP): 13.04A
(VOC): 49.75V
(ISC): 13.93A
Module efficiency: 21.1%.

Any opinions, suggestion or advice welcome.

 

[autorouter]

I guess that I will have to wait until I buy the new panels, to know what amperage or voltage that the Solar dc circuit breaker will need to be. Maybe not such a problem if using a solar disconnect? I am looking seriously at 2 of these panels.
2 x 24v 545W JA Solar Mono PERC.
(PMAX): 545W
(VMPP): 41.80V
(IMPP): 13.04A
(VOC): 49.75V
(ISC): 13.93A
Module efficiency: 21.1%.

A DC circuit breaker is not necessary, a plain old switch will do. If you look at the amps rating, the normal max amps will be 13.04A (Impp). If the panel is totally short-circuited, the amps increases, to 13.93A (Isc). If the DC circuit breaker will happily pass 13.04A, it won't trip if the amps goes up to 13.93A. So it will never trip, even if there's a direct short fault.

 

[PeteMallorca]

Thanks autorouter. I've seen them in so many circuits but my main reason for anything, is to isolate them, if needed. So a switch that can handle about 20A and 50v dc, would be OK?

 

[Richard n Ann]

Thanks autorouter. I've seen them in so many circuits but my main reason for anything, is to isolate them, if needed. So a switch that can handle about 20A and 50v dc, would be OK?

I fitted this battery isolator:

 

[PeteMallorca]

Thanks Richard n Ann. Who did you get it from please?

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[Richard n Ann]

Thanks Richard n Ann. Who did you get it from please?

Ebay I think... I'll have a look...

 

[Richard n Ann]

Here it is, rated at 600a but it's not too physically big
(6.5cm Square)

275A Battery Switch Isolator Cut Off Kill For Knob Camper Marine Boat Truck 12V 613310304685 | eBay

Find many great new & used options and get the best deals for 275A Battery Switch Isolator Cut Off Kill For Knob Camper Marine Boat Truck 12V at the best online prices at eBay! Free delivery for many products.

www.ebay.co.uk

 

[PeteMallorca]

Brilliant. Thanks.