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Replacement Inverter for old FIT system

 
Solar Photovoltaic (PV)
Last Post by Old_Scientist 5 months ago
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bontwoody
 bontwoody
(@bontwoody)
Noble Member Contributor
Joined: 4 years ago
Posts: 1003
Topic starter 02/10/2025 3:55 pm  

The Fronius IG30 inverter that came with the house's original FIT 2.66 kV solar system, appears to have given up the ghost. Its reporting a state 104 error. It might well have been my fault as I changed my consumer unit over to MCBOs, and the error started when I rebooted. Im assuming its nothing to do with the change from RCD+ MCB to MCBOs (or my wiring!).

Im looking for a cheap second hand replacement but know virtually nothing about what to get for a hassle free DIY job. So far Ive flagged it needs to be 3kW, have a low DC Startup voltage and ideally have the same DC connectors (although looking at it it might be directly wired)

Any help much appreciated 🙂

20251002 164908
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20251002 164855

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House-2 bed partial stone bungalow, 5kW Samsung Gen 6 ASHP (Self install)
6.9 kWp of PV
5kWh DC coupled battery
Blog: https://thegreeningofrosecottage.weebly.com/
Heatpump Stats: http://heatpumpmonitor.org/system/view?id=60


   
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bontwoody
 bontwoody
(@bontwoody)
Noble Member Contributor
Joined: 4 years ago
Posts: 1003
Topic starter 02/10/2025 4:56 pm  

I just checked my 15 year old panels output last summer and they never got above 2.5kV so maybe one of these would fit the bill? https://midsummerwholesale.co.uk/buy/solax-inverters/SolaX-X1-MINI-2.5kW-G3


House-2 bed partial stone bungalow, 5kW Samsung Gen 6 ASHP (Self install)
6.9 kWp of PV
5kWh DC coupled battery
Blog: https://thegreeningofrosecottage.weebly.com/
Heatpump Stats: http://heatpumpmonitor.org/system/view?id=60


   
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 Old_Scientist
(@old_scientist)
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Joined: 2 years ago
Posts: 357
02/10/2025 5:45 pm  

@bontwoody I have a single string 3kW solar AC inverter (non-hybrid), one year old, recently decommissioned as I've just had a Tesla Powerwall 3 installed, and moved my solar to the PW3's inbuilt inverter.

It's a Fox ESS S3000, user manual below:

FOX-ESS.COM "https://www.fox-ess.com/download/upfiles/10-203-00002-06+S+User+Manual.pdf"

Startup voltage is low at 60V

It's the same price new on Midsummer as the 2.5kW Solax you linked. Comes complete with wireless dongle for wifi and app

Happy to discuss 😀 


This post was modified 5 months ago 3 times by Old_Scientist

Samsung 12kW gen6 ASHP with 50L volumiser and all new large radiators. 7.2kWp solar (south facing), Tesla PW3 (13.5kW)
Solar generation completely offsets ASHP usage annually. We no longer burn ~1600L of kerosene annually.


   
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