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Do you know which one would have a lower rating EMI/RFI? Mpp solar or victron>? Thanks

Your PV wires between bus bar and MPPT MUST be able to handle at least 55A, and you must have a fuse/breaker to protect that wire. 1.25X 55A, round up to nearest common size. So, even though I have each PV series fused just before going onto the bus bar, I need another fuse after the bus bar...

Here is the info on the 4mm2 cable I have.

You are risking a fire. Default 35mm^2 equivalent in the U.S. is NOT rated for 100A. the 35mm2 cable I have is rated to 188A. I just spoke to a solar place, told them what I have, they said it is fine to put a 125A breaker between the mppt 250/100 charger and batteries running 35mm2 wire. They...

I will get a 125A NH00 Fuse for the battery. thanks once again for your help ;-)

this fuse work? https://www.solar4rvs.com.au/exotronic-120a-surface-mount-waterproof-dc-circuit-breaker-side-by-side

I am running 35mm2 cable from charger to batteries.

I will never get over 55 amp from my solar panels. I have a 160 breaker here, but, max from victron is 140a. I rang my elecectrial wholesaler, they do not carry any type of fuse in the 120 to 140a range. So might have to see if I can get something online withing that range. Also, going back to...

Oh ok. Thanks so much for clarifying. I did have a guy install the solar system. Well, its not finished, I have taken over as there are too many mistakes and I am having to redue a lot of it. but, this is not my expertise. So, trying to learn as fast as I can. Really appreciate your help ;-)

I found out that the mppt 250/100 has to be fused from battery with min 120a, max 140a.

Yes I agree with the 10mm2, however, here in my area, none of the electrical places carry 10mm2, its either 4 or 6mm2. thats why, I thought I would double the 4mm2, not ideal, but, I cant get the 10mm2 ;-(

Off topic, I just read when trying to find what fuse I need for my 48v lithium battery bank, I found this on the victron website "PV array grounding The positive and negative of the PV array should not be grounded. Ground the frame of the PV panels to reduce the impact of lightning. Do not...

I will also add, that from the mppt victron 250/100 charger, I have my 35mm2 pos cable running through a pull down/out fuse of 160a, 500VAC. Would this be correct? this is in case I need to quickly cut power from batteries to charger if malfunction or something.

Hi, Ok thanks so much for that. So I am covered with the fuses on each string, yes, I do have the neg fused as well. Maybe an over kill anyway, better to be safe then sorry. As for the fused pos line from the bus bar to the victron mppt, I did not think of that, what size fuse or also what type...

Ok thanks so much. So, I have those 4 series coming through 20a fuses, both pos and neg, then going to the bus bar. So, in total I have four lines, (8 lines counting pos and neg) coming down from the roof going through individual 20a breaker fuses, then to bus bar. It seems that even though I...

Ok thanks. So it is possible but only if there is some type of issue. In normal situations, the 55a will not flow back up the 13a lines. So, because I have the 20a fusees on each string, I should be covered right?

I didnt add that as that was irrelevant to my OP. I just want to know, if you have 13a coming in off each string, to a central bus bar, (4 strings in this case), the total amps is multiplied by 4 so around 55a at bus bar. Will this flow back up the 13a lines coming into the central bus bar from...

This is my setup. But, where I have crossed out the mc4 connectors, I have written bus bars. there are no mc4 connectors, just bus bas where they have all them mc4 connectors.

Hi, Thanks for your reply. Yes, Its a picture I found online. I wrote bus bars where the mc4 connectors are. I dont have mc4 connectors there, only pos and neg bus bars. I do have the bus bars AFTER the 20a fuses. So, in your opionion, even though there will be 55A at the bus bars, it will not...

Hi, thanks for that. I forgot to mention, each string has its own 20A pos and neg fuse as these come down through a combiner box first.

Please see attached spread sheet. Solar panels are on the roof of house. 16 by 440w panels each. Can I run 4mm2 cable to the bus bars as they are only carrying 13.86amp, but at the bus bar, its goes up to 55.44 when all four series are added to the bus bar. So because I am doing a 4S4P, each...

Any chance you could name some? Thanks so much.

Trying to delete this thread

Trying to delete this thread

Ok thanks Champ. Let me know you you go ;-)

I guess you cant say who you went with? ;-)

Yes, that is what she will do. Thanks ;-)

Can get a 200ah 48v Winston (9.6kwh) second hand (just over a year old and from house solar) for the same price I can buy a complete set, brand new with 3 years warranty, on same system but with Eve sells in Australia. Which would be your pick? ;-)

W

Are you also in Australia QLD?

I got in contact with Amy to buy these 304ah cells, 16 in total to build own 48v system. She says cant do door to door as pack too heavy. Can only ship to closest port. How did you get them? Thanks

Hi Repro, is there someway I can contact you directly, or email? Thanks