Battery-powered gas central heating.

There are some complications.

John

and do not under any circumstances use a Jesus lead :-)

Same also applies if you're using a genny as opposed to an inverter on a car battery.

Some Honda generators can actually run on bottled LPG....

And some of them can be run in pairs linked up to give you power for other light loads like house lighting, smoke/heat/co/intruder alarms and CCTV systems.

you *may* also be able to add a fridge or freezer depending on its startup load and power factor.

Why not get a UPS with an uprated battery?

Most inverters are not particularly reliable so bear that in mind if you're thinking of making your own online style of UPS with your own inverter and charger.

plus you can use a Raspberry Pi with a USB lead so you can monitor the UPS over your home network.....

Thank you. I didn't know that.

Yes. I did know that. The plug swap idea is by far the easiest way. The inverter output would only be connected to the boiler - I have other plans for lighting, WiFi etc.

Another Dave

Another Dave pretended :

It would normally be outside the experience of an heating installer.

yes, you need the services of a Sparky for this.....

You can get changeover switches like this:

I fitted my parents such a set up 5 years ago and added the capacity to run a car in a garage (with the garage door open) to supply the power and recharge the battery.

Three workmen fitted the CH: a plumber, an electrician and the CH engineer himself. I think they all needed work (it was during a major lockdown).

I used the electrician subsequently and was impressed. I'll give him a call.

Another Dave

If I have to run a car to recharge the battery I'll believe the world has come to an end. I envisage charging during normal mains service.

Another Dave

All free solar and wind power then?

I thought you might be interested in the setup

I would not have thought it too hard to do yourself, as long as you make sure the system disconnects the mains before connecting the inverter, and that all the motors will run OK on the inverter output waveform of course as they can be finicky about inductive loads. What about the timer? Is that battery backed as well, and all the solenoids, will they run on the supply? Brian

Yes a two pole changeover should work as long as the inverters earth is connected to mains earth. This certainly worked in a shed for some mains gear, Nowadays I guess I'd look for a smart phone system which itself would need to run from the battery and that is where it gets really complicated as you would need other gear to be powered like routers etc! The plug idea is by far the simplest!

Brian