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I don't see why you can't flip a giant switch to go from grid to home power. It's not automatic, but this tech is well established for gas generator cutover in

I don't see why you can't flip a giant switch to go from grid to home power. It's not automatic, but this tech is well established for gas generator cutover in factories and remote homes.

extraduder_ire 1y ago
The hardest part of that is regulatory compliance on whatever interlock you have installed that prevents you from connecting mains to your backup. The most common solution to that is a switch that goes through fully disconnected in the middle, and I've even seen a sliding metal plate used that interferes with at least one or both circuit breakers.
matthewdgreen 1y ago
You need a home backup battery with a transfer switch, specifically one that accepts solar input. There are a bunch of off-the-shelf solutions out there.
- kragen 1y ago
  Or you unplug your fridge from the wall and plug it into your inverter, with or without battery backup. Or you just leave it plugged into your APC UPS. I think cheaper ones than this US$60 2000W inverter exist: https://www.temu.com/ar/-2000w-inversor-de--con-pantalla-digital-para-coche-12-a-220v-230v-ca-carga-usb-dual-rapida-enchufe-universal--compacto-para-coche-hogar-camping-y-uso-de-emergencia-inversor-portatil-respaldo-de-energia-para-el-hogar-inversor-moderno-construccion--sin-bateria-g-601100963871787.html?_oak_mp_inf=EKv4s8ur1ogBGiBlYzU1ODNkNmU3NDk0OTJlOGRhZmJlMTg1OWU3MGMyYSCmqcrRmTM%3D&thumb_url=https%3A%2F%2Fimg.kwcdn.com%2Fproduct%2Ffancy%2F2d5da246-7672-4804-84c3-0390664a9f37.jpg%3FimageView2%2F2%2Fw%2F500%2Fq%2F60%2Fformat%2Fwebp&_web_cover=thumb_url&pic_h=1600&pic_w=1600&spec_gallery_id=7468900761&refer_page_sn=10009&refer_source=10001&freesia_scene=2&_oak_freesia_scene=2&_oak_rec_ext_1=ODIxNTQwMA&_oak_gallery_order=428504583%2C1688359484%2C1501746383%2C1913573018%2C679200816&refer_page_el_sn=200049&from_rec=1&enable_cache=1&_x_sessn_id=497nk8g6yf&refer_page_name=search_result&refer_page_id=10009_1759228635150_yhzzphjgg6 https://www.temu.com/ar/-2000w-inversor-de--con-pantalla-dig... In the US they cost a lot more, but they still exist; there's a 750-watt unit at Horror Fright for US$70: https://archive.fo/1pzdK https://archive.fo/1pzdK
giantg2 1y ago
I thought the generators phase differently with the movement of the engine vs the type of inverter you nened for use with batteries. I do agree it should be trivial.
baq 1y ago
You can, you need something to form frequency if it isn't coming from the grid and you very much need to synchronize when grid frequency comes back or your equipment will generate expensive smoke and noise.

I don't see why you can't flip a giant switch to go from grid to home power. It's not automatic, but this tech is well established for gas generator cutover in factories and remote homes.

extraduder_ire 1y ago

The hardest part of that is regulatory compliance on whatever interlock you have installed that prevents you from connecting mains to your backup. The most common solution to that is a switch that goes through fully disconnected in the middle, and I've even seen a sliding metal plate used that interferes with at least one or both circuit breakers.

matthewdgreen 1y ago

You need a home backup battery with a transfer switch, specifically one that accepts solar input. There are a bunch of off-the-shelf solutions out there.

kragen 1y ago
Or you unplug your fridge from the wall and plug it into your inverter, with or without battery backup. Or you just leave it plugged into your APC UPS. I think cheaper ones than this US$60 2000W inverter exist: https://www.temu.com/ar/-2000w-inversor-de--con-pantalla-digital-para-coche-12-a-220v-230v-ca-carga-usb-dual-rapida-enchufe-universal--compacto-para-coche-hogar-camping-y-uso-de-emergencia-inversor-portatil-respaldo-de-energia-para-el-hogar-inversor-moderno-construccion--sin-bateria-g-601100963871787.html?_oak_mp_inf=EKv4s8ur1ogBGiBlYzU1ODNkNmU3NDk0OTJlOGRhZmJlMTg1OWU3MGMyYSCmqcrRmTM%3D&thumb_url=https%3A%2F%2Fimg.kwcdn.com%2Fproduct%2Ffancy%2F2d5da246-7672-4804-84c3-0390664a9f37.jpg%3FimageView2%2F2%2Fw%2F500%2Fq%2F60%2Fformat%2Fwebp&_web_cover=thumb_url&pic_h=1600&pic_w=1600&spec_gallery_id=7468900761&refer_page_sn=10009&refer_source=10001&freesia_scene=2&_oak_freesia_scene=2&_oak_rec_ext_1=ODIxNTQwMA&_oak_gallery_order=428504583%2C1688359484%2C1501746383%2C1913573018%2C679200816&refer_page_el_sn=200049&from_rec=1&enable_cache=1&_x_sessn_id=497nk8g6yf&refer_page_name=search_result&refer_page_id=10009_1759228635150_yhzzphjgg6 https://www.temu.com/ar/-2000w-inversor-de--con-pantalla-dig... In the US they cost a lot more, but they still exist; there's a 750-watt unit at Horror Fright for US$70: https://archive.fo/1pzdK https://archive.fo/1pzdK

giantg2 1y ago

I thought the generators phase differently with the movement of the engine vs the type of inverter you nened for use with batteries. I do agree it should be trivial.

baq 1y ago

You can, you need something to form frequency if it isn't coming from the grid and you very much need to synchronize when grid frequency comes back or your equipment will generate expensive smoke and noise.