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Paul Oosthuizen

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  1. I have 2x us3000 for R1500 based on Pietermaritzburg
  2. I am in the same situation upgraded to three batteries. Got the same item for sale. Based on Pietermaritzburg. Same price R2000
  3. Even at 6000w we are talking 125A which is well within limits as only 0.1% drop?? And battery was giving 2000w and mppt 2600 when I checked before disconnecting. I also did have inverter limit set to 4500w as well. If it went above thought it would have switched to Eskom which I have limited to 32A (7000w) but that should be direct pass through. Seems I just got careless with a washer. Small mistakes not happy consequences. But new 70mm wire going in this week anyways.
  4. So had a bit of this battery fuse cable discussion when planning my install. You can check out the posts on my account. Plonkster and others clarrified draw on the batteries is limited by Pylontech BMS with dvcc activated in ESS when I queried fuses and cabling. I thought having 100A fuses would be safer than 200A when my draw is Max 74A on batteries. I did see fuse and cabling spec for Multi II 5kw. But that is for 200A draw and up to 5m return- I have 74A battery to busbar (and Pylontech is happy with their cabling even for 4 batteries on their install, so two manufacturers offering different spec here and don't even know how to source 70mm for pylontechs with their proprietary connection). I have 100A fuses on both battery busbar link and mppt busbar link. I used Victrons downloadable app to check on cabling between busbar and inverter. No one in this post has questioned the maths I offer? No one here seems to indicate that if my cable was good, doing the maths, it would have fried under the load I was running. Or did I miss something. Reality is I still have a burnt cable, so either crimp bad- though pretty sure crimp is perfect, or washer where it should not have been and limiting lug contact to inverter connection was the problem. I want to replace cable anyway as insulation damaged so will most likely go bigger and get 70mm run. Does seem over spec though but can't do any harm.
  5. 2kw kettle, 2kw geyser and 2kw dishwasher. But multiplus grid connected so can draw excess from the grid. This is a grid tied setup
  6. Difference in the lugs is simply that I pulled some insulation tape off the black one, they are identical lugs and cables. On the batteries- Pylontech supplies what I guess to be 25mm cable with around 2m length. This goes to busbar (4m round trip) Inverter can only charge 70a and discharge limited to 37A per battery=74A for two. I did software limit to 4500W through inverter through ESS. Thought 100A fuses all good? The battery cables have special clips that are not readily changeable. Seems racks of 4 batteries possible. They seem to feel these cables adequate as no alternatives possible?? So not sure about 70mm here. Then the 35mm cable with approx 1m round trip run from busbar to inverter. I was getting 2600w odd from mppt and 2000w from battery. 4600w÷48v= 95A total running through washer was not good. Would have thought cable would have been fine for 35mm as 0.2% loss at 180A over 1m run, 36mm m8 Lugs don't believe a problem Perhaps 50mm with larger lugs though, but this only drops loss from .3 to .2% with 9000w surge- which is below my supply of 3000w from panels and 3500w from batteries. Both seem acceptable losses.
  7. So just realized there was a washer between lug and board, humm presuming that resulted in the problem when there was a big draw. This make sense¿ Dammit small oversight potential big problem Now to cleanup the mess on the contacts
  8. So this morning walked into the garage where the inverter setup is and smelled something burning. Killed the power and discovered the attached cable burn. It is where cable from busbar connects into inverter Setup Multiplus II 5000 Smart solar 150/85 with 12 by 280w panels in 4 strings 2 by pylontech us3000b. Using 35mm cable between battery and busbar, busbar to inverter. Got mersen 100A DC fuses on both poles of battery Was drawing around 4000w two 2kw kettle, 2kw geyser, 2000w from battery and 2000w from panels. Installation about 2 months old. Dishwasher was on may have kicked into heating at same time as kettle (still training Mrs but she may have checked power and dishwasher element off). Have got software limiter of 4500w on inverter to limit battery draw. I have a bad crimp, bad connection to board?
  9. Great had me really confused there thank you
  10. So just connected my system and no power from mppt. There is a voltage 105v measured top of breaker from inputs of panels. Concern that positive and negative seen to swop sides through breaker. I.e. positive is right at top of breaker and left on the bottom. Little diagram on breaker seems to agree with this. Am I missing something here. Running ess everything else working fine
  11. So installing multiplus ii 5000 with 2 pylontech us3000b. Hoping to expand when budget allows to four. Victron manual recommends 200amp fuse (sourced 3p mersen disconnect for this), and 70mm cabling. The pylons come with cabling that seems to be 32mm as far as I can establish. Inverter can run 9000w peak (which at 48v makes 190A if my maths calc is correct one). Hope I never draw that. So some questions Is there is any way to limit the Inverter draw say to 6000w (125a) using software or anyone know about upgrading cabling with pylon connections to ensure they cope,. Or will cables handle that draw which is for a limited time as it is a peak (though cannot find how long Inverter would handle that peak)
  12. I ordering two usb3000 with a Victron multiplus II 5000 (aiming to get 4 total). Manual recommends 200a fuses. Means a big jump to larger disconnect from 125a fuse on the multi 3000 model. Cables then seem undersized?? Can one put on thicker cables with existing lugs or get new ones
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