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Adding batteries to a grid tied PV system [Aus]
#1
Hi guys,

First off I'm new here so I may introduce myself quickly, My name is Luke & I live in Victoria Australia and I am looking into the possibilities of adding battery storage to my house without paying the premium price tag. 

Anyway I have recently had a 6.6kw grid tied PV system installed, all signed off and now receiving minimal returns ($0.12c per Kw buy back) 
Inverter: Fronius Primo 5.0-1,  Panels: 24 x Jinko 275W

Batteries: Currently sourcing 18650's with the hope of eventually having around 10kw+ stored.

Now I'm sure this has been covered before but I have yet to find an exact answer to my question...

Is it possible to add a battery inverter parallel to my existing grid tied inverter allowing me to first use stored power before falling back to the grid supply?  

Following that what are my other options? 
1. Replace my current inverter for a hybrid inverter. 
2. Have an electrician rewire select circuits of my house on a transfer switch allowing me to use my stored power without the circuit ever being grid tied?  
3. Other options?

Has anyone in Aus achieved something similar and made it through the red tape?

Any advice is greatly appreciated Smile
Meesen0743
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#2
Pretty much all those options are needed.

You can't add batteries to a grid-tie and have it function w/o grid power.

Hybrid inverter will allow for grid-tie but also will disconnect from the grid when no signal from them and keep you up.
You should always have a separate set of circuits that run independent of the others with it's own inverter if possible as this allows for 100% disconnection from grid
Proceed with caution. Knowledge is Power! Literally! Cool 
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#3
(09-08-2019, 09:40 AM)Meesen0743 Wrote: Is it possible to add a battery inverter parallel to my existing grid tied inverter allowing me to first use stored power before falling back to the grid supply?  

Following that what are my other options? 
1. Replace my current inverter for a hybrid inverter. 
2. Have an electrician rewire select circuits of my house on a transfer switch allowing me to use my stored power without the circuit ever being grid tied?  
3. Other options?

Your existing installation can remain untouched.

Install a Victron MPII, or a number in parallel to suit your loading, along with a Venus device running ESS - your Fronius is one of the few truly SunSpec compliant inverters so will play nicely with the Victron.

Configure the loads which you require to be maintained to the AC2 output (critical loads) - note only these critical loads need go through the inverter/s.

Avoid small format cells such as 18650s if possible.

https://www.victronenergy.com/live/ess:d...ion-manual

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#4
Hey Meesen. I am in Melbourne! I have a grid connect 3kW. I made a battery pack that charges from daytime 240v through a second hand Victron charger/inverter. I plug my fridge and nbn/modem/qnap server: whatever. so I'm not grid connect battery - but select some loads that I charge during solar. If I make a bigger batt I'll put the light circuit on it.
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24 User(s) read this thread:
Sean (09-19-2019, 09:42 AM), Zvonko000 (09-09-2019, 07:36 PM), Riplash (09-08-2019, 04:48 PM), chuckp (09-09-2019, 05:02 PM), camthecam (09-20-2019, 12:13 PM), stevelectric (09-16-2019, 08:24 PM), ajw22 (09-11-2019, 04:44 AM), Maniac_Powerwall (09-08-2019, 10:44 AM), intra (09-12-2019, 02:30 AM), mackoffgrid (09-10-2019, 08:37 PM), Meesen0743 (09-09-2019, 11:28 AM), Ibiza (09-19-2019, 12:11 PM), HughF (09-09-2019, 01:17 PM), mike (09-08-2019, 11:45 AM), Majorphill (09-09-2019, 05:02 AM), Korishan (09-09-2019, 12:47 PM), A + A (09-09-2019, 02:34 PM), PAF (09-09-2019, 01:09 PM), jdeadman (09-19-2019, 06:13 PM), Geek (09-12-2019, 02:54 AM), Jon (09-11-2019, 03:13 AM), djuro (09-20-2019, 06:28 PM), BaronVonChickenPants (09-19-2019, 12:39 PM), J.BulF (09-19-2019, 03:31 PM)

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