Do I need another inverter?

Codemonkey76

Codemonkey76

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Jan 31, 2019
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I am having installed next week a 6.5KW Solar PV array (20 x 310W Mono Crystaline Longi Panels) paired with a 5KW Fronius 5.0-1 inverter. I am looking to build a DIY powerwall from 18650 batteries. Will I need another inverter, or would it hook directly into the Fronius?
 
Does your frontius have a battery hookup? If it does, then most likely yes. If it doesn't, you can't parallel it with the solar input. Things will get very exciting really quickly, and not in a good way.
 
I think that Fronius is a grid-tie only inverter but has capability to integrate battery storage with another Fronius box...
 
You need to make an AC coupling with a Victron inverter. Fronius cannot handle batteries (there is one hybrid model)
 
100fuegos said:
You need to make an AC coupling with a Victron inverter. Fronius cannot handle batteries (there is one hybrid model)
Click to expand...

Yes, this will work! Ill go the same rout.

Both inverters work totally independent then. Victron is solely controlled by the smart meter sitting at your grid connection.

Regards
Karl
 
Couldn't I have the solar panels go into a solar charge controller into the batteries, and then run the batteries into the Fronius, instead of running the solar panels directly into the Fronius inverter?
 
Codemonkey76 said:
Couldn't I have the solar panels go into a solar charge controller into the batteries, and then run the batteries into the Fronius, instead of running the solar panels directly into the Fronius inverter
Click to expand...
Most grid tie inverters are high voltage DC - in the 100s of volts. High voltage DC is very efficientand makes sense for PV (solar) arrays. Not for batteries. Way too dangerous. A high voltage battery is capable of delivering currents orders of magnitude greater than a PV array. High amps + high voltage = very dangerous. Even if you were a very experienced electrician and capable and comfortable working withhigh voltage DC, the cost of the hardware - such as breakers and fuses, are incredibly expensive.
 
Geek said:
Codemonkey76 said:
Couldn't I have the solar panels go into a solar charge controller into the batteries, and then run the batteries into the Fronius, instead of running the solar panels directly into the Fronius inverter
Click to expand...
Most grid tie inverters are high voltage DC - in the 100s of volts. High voltage DC is very efficientand makes sense for PV (solar) arrays. Not for batteries. Way too dangerous. A high voltage battery is capable of delivering currents orders of magnitude greater than a PV array. High amps + high voltage = very dangerous. Even if you were a very experienced electrician and capable and comfortable working withhigh voltage DC, the cost of the hardware - such as breakers and fuses, are incredibly expensive.
Click to expand...

The DC input voltage range for the inverter is 80-1000V, and I believe in Queensland you can legally work on DC as long as it's below 120V. I was planning on putting the batteries in a 30S configuration giving 108V nominal, 120V if charged up to 4.0v per cell.

As I am not sure how the solar panels are being installed (series / parallel). I am not sure what the voltage coming out of the panels would be. The panels are 32.3V each and if connected in series would be around 646V at maximum output, which means I would definitely need an electrician to do any work between the solar cells and the charge controller.
 
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