I have lived over 20 years off-grid.  3Kw of solar panels, 3Kw inverter,  24 Volt 1330 Amp-Hour batteries. (lead-acid.)

We have 240V AC throughout the house, plus a DC 24 Volt supply to the house.

I had intended that the 24 V DC would supply a special DC  fridge and possibly a home-converted washing machine. I have previously converted a couple of washers to 12 volts DC - a Hoovermatic twin tub, and a Hoover slope-front Keymatic. Manual operation, not automatic.

The 24 V DC supply also feeds a 24:12 Volt DC:DC  converter that supplies a few 12 volt power outlets and some lights. The idea was two advantages - some always-on small loads would run direct from the batteries, such as cordless phone - this would allow the auto-sensing inverter to switch itself off when no other loads were connected, saving the idle power of the inverter. Also it would allow us some basic functions if the inverter failed.

In reality... Fridge technology has increased in efficiency to the point we can run a standard 2 door fridge, no need for an expensive "solar fridge." Ditto for washing machine - we run a Miele front loader. We have other "always on" small loads that keep the inverter running 24/7, it would be years since it went to idle mode. (WiFi, printers, so on.) We have enough solar panels to cover that.

In the battery/inverter shed we also have a petrol (gasoline) generator for sunless periods. It has a 24 V DC light in the room, and 2 x 24 Volt DC fans to keep the room cool when the generator is running.

I still have an interest in DC appliances, and have a few of the parts I used to convert washing machines to 12 volt DC, and some parts to convert one to 24 V Dc if the mood ever takes me - but in reality, solar panels are cheap enough these days that you don't need bespoke devices like that any longer, you can run "normal" stuff of solar.

I also once converted a belt-drive Whirlpool washer to use a more efficient motor, but still off 240 volt AC - it used a 60 volt DC computer tape drive motor, off an obsolete mainframe computer, to drive the washing machine. It still has 240 V Ac supply, the wires that used to feed the original 240 volt motor instead went to a toroidal 240V : 60V transformer, then to a bridge rectifier, then to the wash motor. The Whirlpool washer didn't reverse the motor to change from wash to spin, that made it easier to convert. It reduced the power consumed from about 650 watts to about 200 watts. Spin was faster, too, as the DC motor didn't operate at a fixed speed, it would speed up as the load reduced.