Pocster

That’s a number 1

Wonder what the lighting is for a number 3 …..

Thanks - will check it out later

Address please ?

Tomorrow night could be the day ! EV sufficiently low . PV generation for tomorrow looks low . So ! Late in the afternoon empty PW into EV . Keep going then PW will pull from SE and drag that down . Then set SE to charge at off peak …. then wait !!

https://www.bbc.co.uk/news/uk-england-oxfordshire-51188160

It’s all getting to complicated all this talk . So I’ll just stick with

Patience guys ! . I’m driving my EV everywhere so I can flatten it

I did think this ! . Not about showering in the night ; that’s a given ! . What happens when either is 100% full ? - does it act differently/ change modes . Fun and games in the multi verse !

This installer didn’t install the PW so assume CT clamps etc. in that are “ as is “ . Would you like to place a guess on what will happen when both go to charge off peak from the grid ??

Don’t know will look . As it just doesn’t take regardless then effectively it can maybe distinguish between PV and power source ( as such )

@Radian a question for you . Why doesn’t the PW just take from the SE when it’s <100% ? What I mean is the PW sees the SE as solar ( regardless of whether it’s PV or SE ) . So say PV production is low today ( real sunshine PV ) and PW is <100% . Why doesn’t PW just drain SE until it’s full ? I.e it’s just PV to it after all …. The answer doesn’t matter ! 😁 - I’m just curious !!

Exactly ! This I have achieved ! The issue is when they both are set to charge from the grid . I’m hoping the PW won’t ‘see’ the SE as SE will be set to charge . Therefore PW will charge from grid . No idea if that will happen ! Frustratingly there’s so much solar I can’t empty the buggers to force a charge at off peak ( caveat being PW will ‘decide’ whether it charges or not ) . Both charging at the same time is my test for winter mode I.e no PV . Best find out now not later ….

Do it and be damned Research as you go , learn as you go . Takes for ever . But what’s the point of life without any challenges ?? 🙄😁

😁 they said the same about underground housing …..

I’ve said it before I’ll say it again ….. If it was easy everyone would do it !

Lol ! Bit of a head f isn’t it ! imagine the fun I have when SE says there’s 6kw of solar at 5am ! PW says house load at 4kwh when it isn’t . PW says PV at 3kwh when there’s no solar because it’s draining the SE . The list goes on 😁

Yes . Whole house off pv and off grid. PW was there long before current installer ( sorry probably should of made that clear ) so SE is an add on . I’ll get it to work ! -

4 hours off peak is 00:30 to 04:30 so no pv Your consumption a bit less than mine 😁

Yes it matters . I only have 4 hours . That’s the total time a depleted PW needs to charge . If one takes from the other - you are simply shifting the load not charging simultaneously ( so do not fill both batteries and equally charge/ discharge cycle reduces battery life span ) . Import bill this month is zero 😁

Yes 2 systems, 2 batteries. The installer ( I asked many questions ) said they could work together and can charge from grid simultaneously . I have that in writing. I went on a holiday recently and explicitly asked the rep in resort if it was "adults only" . They said yes. It wasn't so after the holiday got half my money back. My point being I have nothing to fear if these 2 systems don't work (though I'm sure they will in the way I want ). I see PW as the dominant device here. You have very little control over it. I give it the off peak charge window and it decides whether to charge and how much. It takes into account apparently your consumption, how much PV you generated (just the day before?, or week?, or month? no idea ) also *allegedly* it takes into estimated account PV production tomorrow. SE is dumb. This makes life simpler. It will charge/discharge at set times/days/months - which I can define. The MAIN objective is in winter. 13kw storage in PW is not enough to last the day (even with some negiigle PV). So I need more storage so I can fill my boots with just off grid electricity. Don't want to spend 10k on 3 phase and then ££££ on another PW - oh and maybe rewire my house !!! So a 'simple' battery that sits (how I view it) between PV and the inverter is what I need. When PW is <1% it drains from the SE . This is what I want. If load > 5kwh (max output for PW sustained) it will pull from SE and any PV.. This is what I want. What I don't want is SE stealing from PW then PW stealing from SE. This I think I have stopped. So now; it's just a case can both systems charge from the grid simultaneously .Not one charges, other steals from it. Otherwise essentially only 1 will be charging in my 4 hour window. TBH @ProDave I treat this 'problem' just like building an underground house from zero knowledge. Just give it a go and learn. Doesn't mean I won't fail or f up. Those are guaranteed . Installer will sort this if I can't otherwise I start claims court. They are still in comms with me even though been paid. I also recall they did say that another customer was having an SE added to their PW - so they in theory will experience the same issues.

Sorry I said 3.68kw from memory ( also because inverter is 3.68 max ). But yes it's 3.3kw.

I actually can’t find the rate at which it charges from AC … PW max charge rate is 3.68kwh . SE …???? . That’s what I’m trying to fathom . Though appreciate all batteries are DC . Of course though I may be asking the wrong question ! I’m trying too see that in my 4 hour off peak window ( and assuming they can’t charge simultaneously from the grid ) if there’s a preference to let one charge before the other …

@Radian perhaps you’ll know ! How much faster does DC charge over AC ? How do you compute the max kWh a DC battery can draw ( charge ) ?

I did have reservations they wouldn’t play nice . Installer said they would though it’s the 1st install he’s done like this . Indeed I can’t find anyone else via googling who has . I’m confident I can sort this ; if not via SE options then a plan B is the arrangement of CT clamps . Ultimately SE batteries are easier to come by than PW - so it’s only a matter of time before a PW owner considers a non Tesla battery to extended their storage .