![]() ![]() But the wires between the ground bus and the PV panel and SCC are attached to the non-current-carrying metal parts of the components (aluminum PV frames, and metal SCC heatsink/case). I think that maybe you are thinking about the negative bus. You may be right, but I'm not convinced this is true. I'm still thinking through a lot of this though, so its quite likely I'm overlooking or misinterpreting some point So in normal conditions, I think the BMS can operate as designed, if there is a short it would be bypassed, but then, if you have a short I think you've got bigger problems and you want your real OCP devices to kick in and break the circuit on the + side. They (1) keep all the metal components of your system at the same electrical potential (2) give electricity a path back to the source if there is a short to the metal casing of a piece of equipment.Īll devices are wired to the positive and negative busbars, the only connections that bypass the BMS are the equipment grounding connections. To clarify these are equipment grounding conductors, as I understand it (and I'm certainly far from confident in my understanding), they shouldn't normally carry any current unless there is a problem. But if you imagine current flowing from - to + (Electron flow / physics) my analogy falls apart. I'm still partial to his original Kangaroo AvatarĬould you clarify further? I imagine current flowing from positive to negative ("conventional current flow") so something closer to the negative battery terminal is 'downstream' of something closer to the positive terminal in my mind. While there are some systems that use two bus bars for monitoring, I think they are right next to each other (connected) not separate. One on the bus bar (in black) and then one on the ground bar (in green). In your downstream diagram, where would you put the shunt? The answer to my rhetorical question is that you would need two. The purpose of a shunt is to give your monitor a way to measure flow going in and out. ![]() If that's how you want to do it, then why bother with a BMS in the first place? If you bought the charging sources into the circuit between the BMS and the battery - as shown in your downstream diagram - then the BMS doesn't have the opportunity to tell the charging sources to go to hell by shutting off the charge. There would be only one connection for those and you would use the SCC as the connection label. In your downstream drawing, marking the Solar Charge Controller and the PV panels on the same bus is redundant. I agree with the way smoothJoey (of the ever changing avatar) uses the terms upstream and downstream. ![]()
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