Recent content by jameshowison

  1. jameshowison

    Complete rebuild of a house - how would you power and heat/cool ?

    I'm late to this thread but you might find http://coolcalc.com a useful place to start to figure out HVAC loads. It's a full on Manual J approach and free for homeowners (they charge to download the official forms for code officials, like $15 or so, it's a cool business model)...
  2. jameshowison

    Ok to attach more than one cable per stud in Lynx busbar?

    Ah, I finally found a picture with more than two wires, looks like they just offset the ring terminal connects by 20-30°. https://community.victronenergy.com/storage/attachments/26381-img-4581.jpeg
  3. jameshowison

    Ok to attach more than one cable per stud in Lynx busbar?

    Ah, because Lynx has cables coming from same direction, so to stack them you flip one. Makes sense! I can see that would limit things to two per stud but that is enough, I think. Some diagrams have the ground from the MPPT stacked in the inverter grounding spot as well, so that could free up...
  4. jameshowison

    Ok to attach more than one cable per stud in Lynx busbar?

    I'm confused about whether it's ok to attach more than one wire to each stud in the Lynx busbar? There seem to be "wire separator" pieces of plastic (which the manual talks about removing). Seems the general position on this is "try not to have too many on a single stud, definitely not more...
  5. jameshowison

    Why fuse SCC wire at "far" end?

    Thanks all, makes sense to me. So it's all about identifying the largest potential sources of current and protecting against those. Almost always the battery is the largest source. But I guess with a really massive solar array they are fused in the combiner box or otherwise en route to the SCC.
  6. jameshowison

    Why fuse SCC wire at "far" end?

    In all the diagrams I see the fuse to protect the wire connecting a busbar and the solar charge controller (SCC, MPPT etc) is at the busbar end of the wire, not near the SCC. Given that the power flows from the SCC to the busbar, it seems odd to me that the fuse is at the "far" end. I'm not...
  7. jameshowison

    Question about battery fusing in Midnite wiring diagrams

    Good point. And the charge controller wire is protected through the circuit breaker 16. But they do say in the notes that this is where DC loads would connect, they just aren't shown in this diagram. See the note for 21: "Battery Positive Bus Bar. This is where we would wire the Battery...
  8. jameshowison

    Question about battery fusing in Midnite wiring diagrams

    Battery positive (red) line runs to bottom of breaker, 15. But also off the bottom of the breaker a smaller red line runs horizontally to the bus bar (21). My read is that the busbar is not protected by the breaker. On the other side of the breaker the thick red runs to 31, the inverter, so...
  9. jameshowison

    Question about battery fusing in Midnite wiring diagrams

    Yeah, those breakers are substantial. But trace the red wires one more time, unless my eyes entirely fail me, the busbar is linked directly to the battery, it doesn't pass through that breaker.
  10. jameshowison

    Question about battery fusing in Midnite wiring diagrams

    I've been looking at the Midnite solar wiring diagrams, such as this one: https://www.midnitesolar.com/pdfs/classic_simple_flow_diagram.pdf The confusing thing is that they don't seem to include the equivalent of a Class T fuse on the battery positive. I see that in almost every other wiring...
  11. jameshowison

    Battery disconnect for nominal 48v systems?

    Thanks all. Some good options there. FWIW, I wrote to Blue Sea technical support with: And they replied:
  12. jameshowison

    Battery disconnect for nominal 48v systems?

    Setting up a 48v nominal system. Two 48v batteries in parallel, the Jakiper server rack batteries. Each has a circuit breaker disconnect on the battery. Most schematics also feature a main battery disconnect right at the positive busbar, using the red disconnects from Blue Sea. I would just...
  13. jameshowison

    Fitted a Midi fuse in a Victron Lynx Distributor. Is it OK?

    Is it ok to have multiple wires coming to the same stud in a Victron Lynx? Think multiple 12 AWG wires, fused with a holder or in-line fuse outside the Lynx? Is it ok to have those going to the same stud? They would definitely fit in the outside holes! I think that's pretty common for smaller...
  14. jameshowison

    Fitted a Midi fuse in a Victron Lynx Distributor. Is it OK?

    Thanks. Reason might well be that I don’t know what I doing :) So you are suggesting a small high amp bus bar pair for the high amp stuff (battery, inverter, link to smaller bus bar). And a lower amp bus bar/distribution center for smaller stuff. Basically add a 48v distribution similar to the...
  15. jameshowison

    Fitted a Midi fuse in a Victron Lynx Distributor. Is it OK?

    So that's a definite no. Not really surprising, given the long stud for the MBRF fuses. So if those are added to the positive bus bar in the Lynx (which is the "upper deck") there's no way the lid closes. This is the "Power In" version of the Lynx FWIW (so no second +ve stud). OTOH you...
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