Solar to MPPT Victron 75/15

[Alshymer]

There is a ‘fat’ cable linking the Vanbitz fuse to the battery.
That is the positive feed. The other positive side of the fuse goes to the inverter.
The negative ‘fat’ feed is from the shunt to the battery.
There are then 3 4mm cables coming from a lower fuse array, both of which have 50 amp blade fuses in them.
These wires currently go to the battery positive but I was hoping to add these instead to the new fuse box that you suggested but wouldn’t know what size of blade fuses to use as they had already exited a 50 amp fuse arrangement.
I hope that this is clearer than mud!!!

 

[trevskoda]

I would not use the breakers instead of fuses. unless you get decent branded ones (which are much more expensive then the ones on ebay or the slave-trading temu, they will either trip at a lower current then specified, or they will never trip.

Yes they do trip at lower current, hence i said go a bit higher, i have tested a good few and no bother tripping, but im sure the ones you recoment would be a better bet.

 

[merl]

There is a ‘fat’ cable linking the Vanbitz fuse to the battery.
That is the positive feed. The other positive side of the fuse goes to the inverter.
The negative ‘fat’ feed is from the shunt to the battery.
There are then 3 4mm cables coming from a lower fuse array, both of which have 50 amp blade fuses in them.
These wires currently go to the battery positive but I was hoping to add these instead to the new fuse box that you suggested but wouldn’t know what size of blade fuses to use as they had already exited a 50 amp fuse arrangement.
I hope that this is clearer than mud!!!

As I said previously I'm not a fan of blade fuses, the 50A are probably maxi blade fuses which are larger than standard blade fuses and often better able to carry current but much depends on the quality of the holder .For high current I much prefer something you can bolt down like ANL or Midi.
Obviously it depends on how far you want to go but I think I'd probably ditch the large maxi blade fuses and get a larger ANL or Midi fuse box for the heavy circuits. You'll probably need a second standard blade fuse box to supply the low current circuits.

 

[Alshymer]

Good morning.
If I may take the liberty of questioning you gentlemen a little more as I do want to do this job correctly?
So to recap, I have a 50amp ANL fuse between the battery and the inverter so we can forget that.

Then I have 1 x 50amp maxiblade fuse fitted by Vanbitz. 1 red cable in and 1 black cable out to the + terminal of the battery.
I assume that this is for the van electrical circuit.

The second 50 amp maxiblade has two red cables and both go to the + terminal of the battery.
I don’t really understand what this is for maybe just a safety fuse for the battery?
How can I tidy these 3 leads up so that I only have one extra lead going to the battery apart from the positive lead from the inverter?
Obviously the fuse board that I have ordered as previously suggested is not suitable for this power rating.
I can’t say how much I have appreciated your advice so far and as I am in France it is particularly difficult to receive good information.
I am sorry to have taken up so much of your time so perhaps a concise answer to the above should end the matter.
Best wishes
Martin

 

[Alshymer]

Sorry meant to include this photo.

 

[merl]

The second 50 amp maxiblade has two red cables and both go to the + terminal of the battery.

That's bonkers.
Does the fuse assembly have ONLY 2 wires? With BOTH going to the battery positive?
Is that the fuse in the picture?
If so check the wiring again because if you're right it's doing nothing, take it off

 

[Alshymer]

That's bonkers.
Does the fuse assembly have ONLY 2 wires? With BOTH going to the battery positive?
Is that the fuse in the picture?
If so check the wiring again because if you're right it's doing nothing, take it off

 

[Alshymer]

Yes that’s right like the picture!
Well that’s got shut of 2 wires from the positive terminal.

 

[colinm]

I know it's recommended to fuse the positive side, but that's something else

 

[Neckender]

One of these will do and can be used as a switch which is realy all you require.View attachment 144859

What size for a 200 watt solar panel Trev?

 

[Stratto]

Hi
Could someone tell me if the fuse holders in the photo with 15 amp fuses are good enough for the cable from solar panels to the controller and from the controller out to the battery?
Thanks

No that’s not proper fuses you need an isolator fused between the solar panels and the controller so you can isolate the solar input when working on the system safety first. The existing system if in a MH is fused already for the primary battery and if you have a secondary battery you could fuse it on the positive normally about 25a. Those fuses and wires are not suitable for Solar.