Hybrid v AC-Coupled Solar/Battery Inverters ACvDC

4 Posts

Hi All,
I appreciate there are other threads on this topic, but my question is slightly different.
I get the differences between Hybrid and AC-Coupled Inverters and Batteries. But the installer I chose to go with has imposed their own view on what should be done, against the advice and designs from everyone else I got quotes from, and advice from my own family-electricians. This installer wants to install a separate Solar inverter and battery inverter. The reason they state is that because the array is 150 metres from the house (ground mount), the AC inverter must be located outside at the array itself and only AC taken into the house, because of DC voltage drop.
All my family electricians and the other installers say nonsense. Better to have a hybrid inverter in the house as it's one integrated and simple system and take DC direct from the array, but using thicker 8AWG wires in order to minimise voltage drop (2% only, according to the tables).
I will have 20kws of Pylontech batteries in my house.
Please help me with any of your valuable inputs...I don't care so much about the cost, but I want to make sure I have the best, smartest and most efficient installation.
I appreciate there are other threads on this topic, but my question is slightly different.
I get the differences between Hybrid and AC-Coupled Inverters and Batteries. But the installer I chose to go with has imposed their own view on what should be done, against the advice and designs from everyone else I got quotes from, and advice from my own family-electricians. This installer wants to install a separate Solar inverter and battery inverter. The reason they state is that because the array is 150 metres from the house (ground mount), the AC inverter must be located outside at the array itself and only AC taken into the house, because of DC voltage drop.
All my family electricians and the other installers say nonsense. Better to have a hybrid inverter in the house as it's one integrated and simple system and take DC direct from the array, but using thicker 8AWG wires in order to minimise voltage drop (2% only, according to the tables).
I will have 20kws of Pylontech batteries in my house.
Please help me with any of your valuable inputs...I don't care so much about the cost, but I want to make sure I have the best, smartest and most efficient installation.
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2.72kWp PV facing SSW installed Jan 2012. 11 x 247w panels, 2.5kw inverter. 28MWh generated, long-term average 2.6 Os.
Ie. Solar first, then battery, then grid if i need that much extra?
There will be two strings of 8 panels, each string with Open Circuit of 420 volts at 11 amps.
I did read from another message board that "you MUST use your highest voltage across your longest run with the thickest wire you can afford".
So I'm still ost as to why this solar company is advocating an inverter underneath the array, bringing back AC which will lose more voltage % compared to the whole.
Should I insist on DC and a hybrid inverter? I don;t want to get another supplier as the wait now is over 9 months.