Unloading to the AC grid

Hey,

I was looking around but I couldn't find this specific case where you have a full battery and want to discharge half of the battery to the AC line (so that it'll feed the devices first and send back to the energy company)

What do you guys think that's the best and fastest and least expensive way to build something like that? I was looking at inverters and also hooking it up to the solar connection so that it'll handle it as a default 48v but I'm not sure whether that's the most efficient or if it will cause issues with the amps.

What do you guys think?

Hybrid inverter.

_laurens said:

Hey,

I was looking around but I couldn't find this specific case where you have a full battery and want to discharge half of the battery to the AC line (so that it'll feed the devices first and send back to the energy company)

What do you guys think that's the best and fastest and least expensive way to build something like that? I was looking at inverters and also hooking it up to the solar connection so that it'll handle it as a default 48v but I'm not sure whether that's the most efficient or if it will cause issues with the amps.

What do you guys think?

Click to expand...

Sending to grid almost always requires a utility company approval. It rarely makes sense to use your expensive batteries to send power to the grid.

Mattb4 said:

Sending to grid almost always requires a utility company approval. It rarely makes sense to use your expensive batteries to send power to the grid.

Click to expand...

It's allowed to send power back to the lines (though I would want to limit the current going back), I also got a meter that will go in reverse when delivering back.

I'm still looking around the initial idea is too make a system that will charge the battery's on times when it's cheap (dynamic tariff) and at times it's expensive it will unload.

At this point there is no solar involved; but a load and dump system that will likely be used in combination with 'home assistent'.

Was looking around for idea's and whether it's doable. Any thought is appreciated

1. The charging is about 80 a 90% efficient right?


@dannke thanks I will look into it

Charging your batteries with grid power (and or solar) when cheap and powering your home loads by battery when grid power is expensive might be cost effective. You would need to do the math and allow for repair and replacement costs. If you are allowed a grid tie setup without all the permits and specialised equipment it would make a large cost difference.

I think Deye/Sunsynk have grid feedback with CT clamp limiter. Not sure what models, though.

If you have an old reverse running meter , ensure you don’t trigger negative readings , ie new bill less units then old bill. This will trigger replacement. Modern electronic metres don’t count backwards