I think an open DC grid standard would be amazing, but I'm not so sure about 48v.
What I would do is probably just use 12v nominal for everything, and use voltage levels to signal instead of trying to do real smart communication.
11-14.4v, you're running on battery, if you're a battery, supply till you get to that range. 15-18v, you've got solar, if you're a battery you can charge.
Anything more can be figured out later.
You could have different "Tiers" for other voltages too, but 12v seems to be fine. Inverters are cheap-ish and would be even cheaper if they were used more, just use that for "real power", and optimize the micro grid for what it's really good at, portable and very small setups with a few hundred watts total power.
Enough things are only used intermittently, and we have ways to make batteries safe, might as well put the batteries closer to the load.
If you have something super high power, like a kettle, it can do it's own step up to 120v or 48v, but participate on the bus as a 12v device, and just slow charge at a few amps.
48V DC is already in the dangerous voltages to work with in the home. The human body can already bridge such a voltage, but as opposed to AC, muscles will freeze in position, effectively getting stuck in shock position.
I remember visiting a datacenter once that ran telco equipment on 48V DC. They were much more paranoid about us getting close to such equipment compared to the AC equipment because they de need to "unstick" us. Cool gear nonetheless
What I would do is probably just use 12v nominal for everything, and use voltage levels to signal instead of trying to do real smart communication.
11-14.4v, you're running on battery, if you're a battery, supply till you get to that range. 15-18v, you've got solar, if you're a battery you can charge.
Anything more can be figured out later.
You could have different "Tiers" for other voltages too, but 12v seems to be fine. Inverters are cheap-ish and would be even cheaper if they were used more, just use that for "real power", and optimize the micro grid for what it's really good at, portable and very small setups with a few hundred watts total power.
Enough things are only used intermittently, and we have ways to make batteries safe, might as well put the batteries closer to the load.
If you have something super high power, like a kettle, it can do it's own step up to 120v or 48v, but participate on the bus as a 12v device, and just slow charge at a few amps.