3phase Battery Storage

[Kryten]

Does anyone have experience of 3ph batteries? I could go down the route of three single phase 10kwh sets but we use one phase way more than the others and I would like to try and balance them to make best use of the power

Thoughts please?

 

[spark plug]

Batteries aren’t 3 phase or single phase, it’s the inverter that turns the DC from the battery into AC that controls the output.

In any 3 phase system it is best practice to keep the system as balanced as it possible, so it sounds like a good place to start would be some phase balancing.

 

[ukprop]

I have a similar issue with three phase supply, 2 solar arrays, 2 outbuildings, annex, frequent power cuts and a planned battery to be installed. Working out the best way to manage it so that you maximise the benefit of the battery, solar, FIT (on one array), export tariff on the other array, 2 electric car chargers, Octopus tariff arbitrage, off-peak vs peak car charging, annex usage etc. etc. is really hard. Especially when it is a patchwork of retrofit etc. It is fun trying to 'solve' it for the best system, so I have to run endless sense checks if the extra time effort and cost is worth it. Usually I can see it is a bit of an effort to save £200 a year more. I think batteries will be so cheap in 5 years it all becomes a bit irrelevant and we will just stick one on each phase.

 

[Kryten]

I've now been quoted for a GivEnergy 11kW 3ph all in one AC coupled inverter with 6 x3.4kw batteries. I'm told this will send power down whichever phase needs it.

Phases are as balanced as they can be given the single phase wiring to various buildings and different load timings.

This setup also has the benefit of not upsetting my feed in tariff.

 

[renewablejohn]

I've now been quoted for a GivEnergy 11kW 3ph all in one AC coupled inverter with 6 x3.4kw batteries. I'm told this will send power down whichever phase needs it.

Phases are as balanced as they can be given the single phase wiring to various buildings and different load timings.

This setup also has the benefit of not upsetting my feed in tariff.

Be interested in the price you have been quoted as I know prices have been coming down

 

[ukprop]

Does this also balance the export? I am being quoted 100k by the DNO to accept more than the 3.4?kw export. They also seem to have a say on the size of the battery. This may be on the basis it is on a single phase. Also I have micro inverters which may mean I can’t use the 3ph inverter?

 

[Kryten]

I guess once the batteries are full it will export as normal. I don't know for sure I have a few more questions for the installer though.

 

[wdah/him]

what price does batteries cost roughly?

 

[Exfarmer]

I've now been quoted for a GivEnergy 11kW 3ph all in one AC coupled inverter with 6 x3.4kw batteries. I'm told this will send power down whichever phase needs it.

Phases are as balanced as they can be given the single phase wiring to various buildings and different load timings.

This setup also has the benefit of not upsetting my feed in tariff.

FIT is not affewcted by any battery set up, or usage. It is linked solely to the array/ wind turbine connected to the Mpan it was set up with.
installing batteries as I have done is irrelevant.
the export portion for a sub 30 meter set up will not be affected either provided you do not go on a smart meter.

 

[Kryten]

I've heard instances of some battery installations that have broken the terms of the FiT in how the batteries have been interlinked. Not sure about specifics though. My array is more than 30 so for me that will make no odds.
Installed cost will be £11000

 

[Exfarmer]

I've heard instances of some battery installations that have broken the terms of the FiT in how the batteries have been interlinked. Not sure about specifics though. My array is more than 30 so for me that will make no odds.
Installed cost will be £11000

In that situation, ther only way the batteries would break the FIT terms would be if the batteries were between the array and the FIT meter, then sucking in cheap overnight power to discharge back in the day, which would register as production.. it could be done legally provided the batteries did not take power from the grid but held solar power to periods when it was needed at night, but this would be failing to maximise use of the battery

 

[Happysun power generator]

Yes, my friend, you could buy a 3-phase inverter work for your condition, but you must make sure the voltage of your battery, usual 3-phase inverter require the voltage of battery above 180V; Otherwise, it can't work, but Deye inverter have a special series as low-voltage 3-phase inverter could solve the condition for a little high prices.
I'm Burns, We are Happysun trading company deal with Deye, Megarevo, GivEnergy power equipment etc..., any question please let me know, I hope could help!

 

[snarling bee]

We are similar to many. Hotch porch of single phase from a 3 phase supply apart from grain drying, welder, compressor and electric doors everything else is single phase. Is there a way of checking what is on each phase?
I am looking at battery backup but wondering if we need 3 single phase systems or one 3 phase solution

 

[Exfarmer]

We are similar to many. Hotch porch of single phase from a 3 phase supply apart from grain drying, welder, compressor and electric doors everything else is single phase. Is there a way of checking what is on each phase?
I am looking at battery backup but wondering if we need 3 single phase systems or one 3 phase solution

I would be certain you need a 3 phase system over 3 single phases solutions. It would certainly be advantageous to try and balance out your individual phases but it is certainly safer to maintain all single phase in any one building to one phase.

 

[renewablejohn]

Yes, my friend, you could buy a 3-phase inverter work for your condition, but you must make sure the voltage of your battery, usual 3-phase inverter require the voltage of battery above 180V; Otherwise, it can't work, but Deye inverter have a special series as low-voltage 3-phase inverter could solve the condition for a little high prices.
I'm Burns, We are Happysun trading company deal with Deye, Megarevo, GivEnergy power equipment etc..., any question please let me know, I hope could help!

Its alright having a 3 phase inverter but how do they handle the power surge of 3 phase electric motor start up. I have a 3 phase wood pellet plant that I want to use with a 3 phase hybrid inverter but to date have not been able to find a supplier who can guarantee their system will work with the multiple 3 phase motors.
Main 3 phase motor 7.5kw Total running power 11.85 kw.

 

[sjt01]

Its alright having a 3 phase inverter but how do they handle the power surge of 3 phase electric motor start up. I have a 3 phase wood pellet plant that I want to use with a 3 phase hybrid inverter but to date have not been able to find a supplier who can guarantee their system will work with the multiple 3 phase motors.
Main 3 phase motor 7.5kw Total running power 11.85 kw.

If you run your motors off their own 3 phase input inverters rather than DOL or Star/Delta starters, you will have no problems. Motor inverters are very reasonably priced now, we use Inverter Supermarket https://inverterdrive.com/

 

[sjt01]

Its alright having a 3 phase inverter but how do they handle the power surge of 3 phase electric motor start up. I have a 3 phase wood pellet plant that I want to use with a 3 phase hybrid inverter but to date have not been able to find a supplier who can guarantee their system will work with the multiple 3 phase motors.
Main 3 phase motor 7.5kw Total running power 11.85 kw.

If you run your motors off their own 3 phase input inverters rather than DOL or Star/Delta starters, you will have no problems. Motor inverters are very reasonably priced now, we use

 

[renewablejohn]

If you run your motors off their own 3 phase input inverters rather than DOL or Star/Delta starters, you will have no problems. Motor inverters are very reasonably priced now, we use Inverter Supermarket https://inverterdrive.com/

Nice to know there is a work around. Just wish I could understand what you have written and apply it to this stupid machine. Hopefully the new electric engineers I have found to service the machine will sort it out.

 

[Happysun power generator]

Its alright having a 3 phase inverter but how do they handle the power surge of 3 phase electric motor start up. I have a 3 phase wood pellet plant that I want to use with a 3 phase hybrid inverter but to date have not been able to find a supplier who can guarantee their system will work with the multiple 3 phase motors.
Main 3 phase motor 7.5kw Total running power 11.85 kw.

No worries, my friend, may I have the technical file of your motor?

 

[ukprop]

So I am told the problem I have is as follows. My two existing arrays (4kwh each) have microinverters so I am "producing" A/C that is being dumped into 2 of my 3 phases (one each). If it had been planned as one system you would run D/C to the central point and then get an all in one inverter / battery that would then redistribute the PV power across the 3-phases and the battery. The battery could likewise serve whichever of the phases needs it. Finally the clever computer can ensure the export is limited to the maximum (3.6kw I think) that I am allowed to send out of each of the three phases, and so maximise any export. Instead I have A/C power that comes from 2 separate buildings that can't be managed at the centre to work with a single battery and the balanced export to meet the limits applied by the DNO. The answer is to say this is too complicated and put the battery on the house phase and have 2 arrays on 2 separate phases and be done with it. Unless anyone has any suggestions on how this can be fixed? I am aware that the cost of the solution has to be sensible given the marginal (20-50%?!) of the PV I will be able to 'maximise'.