Is my idea crazy or should I pursue it further?

[johnb80]

Just a note to add to @johnb80 post, the Victron capacities are in VA, not watts, so a 3000VA is around 2500watts with a correction factor of 1, like a toaster or other heater element type load, once you get into the other type loads, including anything with a capacitor, if not even going to attempt to come up with power efficiency factors.

I was keeping it simple (so I could understand it LOL)

The Victron units can be paralleled to increase capacity, but better still, is a load activated stepped turn on that feeds a second inverter into the AC supply side of the primary inverter, then turned off when no longer required ..... all programmable, not smoke and mirrors, but that Arthur C Clarke coined term sometimes comes to mind

Victron have really gone to town with the possible configurations. They all seem relatively easy and intuitive to configure and of course, there's a massive internet presence in forums etc with loads of experts ready to help.

Hopefully, if anyone wants to know, I can still remember how to do if asked .....

I'm sure you will along with the MMI that Victron supply it would soon come back to you.

The last item, if @johnb80 is referring to the Tesla Powerwall ..... I'd think twice about using one, they are built with cells containing cobalt, so susceptible to thermal runaway fire risk, LFP, LTO and Na+ suffer no such risk, last more cycles in a house battery load situation, and the salvage EV comes with all the battery monitoring, safety battery enclosure and the MG LFP variants output 220vac 50 hz at up to 7kw (7,000w divided by 220v = 31.8 amps) so make sure you use 5 AWG multi-fine strand conductor, 2 core and earth orange flex lead, to carry the load from the EV to the house power entry .... your call as to adding a plug and wall socket to make it a plug in appliance if it makes all concerned feel happier about it

The EV batteries do have some disadvantages, cooling & heating, the format of them is not ideal both physically and electrically, the BMS is designed for the car integration whereas the BMS units meant for domestic supplies work as designed and communicate with the inverter(s).

 

[Everest]

Thats my 10c I know not everyone agrees with me and I have even been christened 'some bloke in Lincolnshire' in some quarters, however, all what I have stated above I have installed in my home and it has been working for over 4 years without issue.

Totally agree with all that... you were one of the "others have done that" when I mentioned using V2L to charge home storage batteries.

Well, nearly everything you said...

Above 3.15kW you need to do a G99 application

... the pedant in me will clarify that the cut-off between G98 notification and G99 approval is 3.6kW (16A at nominal 230V). Not that any of us are likely to be deploying such small inverters anyway!

 

[johnb80]

Totally agree with all that... you were one of the "others have done that" when I mentioned using V2L to charge home storage batteries.

Aye, infamous for my battery projects LOL

Well, nearly everything you said...

Oh dear, you were doing alright hehe

the pedant in me will clarify that the cut-off between G98 notification and G99 approval is 3.6kW (16A at nominal 230V). Not that any of us are likely to be deploying such small inverters anyway!

Oh dear, I was wrong, how can I ever live it down, oddly though, so are you
The limit for G98 is 3.68kW or less and three-phase systems with an output of 11.04kW or less.

Gotcha!

 

[Everest]

It is indeed 3680W... in my defence, UK Power Networks round it to 3.6kW in their application forms. Not that we ever "see" the nominal 230V. It's either around 250V when we're exporting or 220V (if we're lucky) when charging.

 

[Bam Bam]

It is indeed 3680W... in my defence, UK Power Networks round it to 3.6kW in their application forms. Not that we ever "see" the nominal 230V. It's either around 250V when we're exporting or 220V (if we're lucky) when charging.

To be fair a lot of companies create 3.6kw inverters for this reason.

Went to check that and the second I checked (Fox) is indeed listed as 3.7kw so they obviously rounded up rather than down!

 

[johnb80]

To be fair a lot of companies create 3.6kw inverters for this reason.

Yes they do, it's also the reason why so many solar installers fit an inverter of this size to avoid the G99 application which leads to very poor installation performance. Switch the kettle and the toaster on for breakfast6 and you're importing from the grid

Went to check that and the second I checked (Fox) is indeed listed as 3.7kw so they obviously rounded up rather than down!

Aye, I'm sure there will be a tolerance in their somewhere.