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project:home_solar_bess [2025-12-30 Tue wk01 11:35] – created baumkpproject:home_solar_bess [2026-01-09 Fri wk02 17:49] (current) – [New Solar System with BESS] baumkp
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 +{{tag>home solar bess battery stroage power electric}}
 ======Home Solar / BESS======= ======Home Solar / BESS=======
  
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 I installed a new solar system with a 6.6kW panels and  5kW sting inverted in April 2025. In August 2025 I had installed a 5kW/10kWhr battery system, the installer replaced the string inverter with the BESS that included an integrated dual string inverter.  There were substantial government subsidies available at the time I had the BESS install that allowed an approximate 6 - 7 year pay back to be possible.  Further to this the system supplier included a full 10 year warranty on parts and labour.  The supplier seemed reputable, that is hopefully will be around and honour any warranty claim with in years.  The BESS supplier Alpha ESS also had a 10 year warranty, which helps mitigate risk on parts warranty. I installed a new solar system with a 6.6kW panels and  5kW sting inverted in April 2025. In August 2025 I had installed a 5kW/10kWhr battery system, the installer replaced the string inverter with the BESS that included an integrated dual string inverter.  There were substantial government subsidies available at the time I had the BESS install that allowed an approximate 6 - 7 year pay back to be possible.  Further to this the system supplier included a full 10 year warranty on parts and labour.  The supplier seemed reputable, that is hopefully will be around and honour any warranty claim with in years.  The BESS supplier Alpha ESS also had a 10 year warranty, which helps mitigate risk on parts warranty.
  
-It is too early to form any conclusive comments on this system.  The spring and autumn periods are traditionally thoses where I have the lowest energy demand (low heating and cooling requiremnts coupled with reasonable solar output, where as summer that has best solar output also tends to have higher associated cooling electrical power costs.  Winter is the worst month with lower solar power generation coupled with high electrical power consumption for electrical heating (reverse cycle heat pump heating coupled with typical Australian pre circa 1995 poorly insulated housing.) My preliminary observations are:+It is too early to form any conclusive comments on this system.  The spring and autumn periods are traditionally those where I have the lowest energy demand (low heating and cooling requiremnts coupled with reasonable solar output, where as summer that has best solar output also tends to have higher associated cooling electrical power costs.  Winter is the worst month with lower solar power generation coupled with high electrical power consumption for electrical heating (reverse cycle heat pump heating coupled with typical Australian pre-circa 1995 poorly insulated housing.) My preliminary observations are:
   * Battery capacity could easily be higher 20kWhr versus installed 10kWhrs.   * Battery capacity could easily be higher 20kWhr versus installed 10kWhrs.
-  * During overcast weather and winter months of lower available solar irradiation it is unlikely the extra battery capacity would be utilised. For about 8 months per year the solar power system would have the capacity to charge the 20kWhr system.+  * During overcast weather and winter months of lower available solar irradiation it is unlikely the extra battery capacity would be utilised. For about 8 months per year the solar power system would have the capacity to charge the 20kWhr system. (Update, after running 4 months into summer. The excess power to charge the battery beyond 10kWhr is more limited than I originally expected due to cloud cover and use of air-conditioning on hot days.  I expect available solar energy capacity above 10kWhr is perhaps more like 6 months.)
   * The the installed cost of an additional of 10kWhr capacity is high. Similar to the outlay cost of the original BESS system.   * The the installed cost of an additional of 10kWhr capacity is high. Similar to the outlay cost of the original BESS system.
   * The increased battery capacity would reduce my grid power consumption.   * The increased battery capacity would reduce my grid power consumption.
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   * Increasing the DoD limit would increase the amount of battery power available for backup in the event of a blackout as well as improving battery life.   * Increasing the DoD limit would increase the amount of battery power available for backup in the event of a blackout as well as improving battery life.
 The high capital cost of the additional battery capacity, coupled with the limitations on usability would probably not make this a viable option in terms of economic payback. It would certainly be nice to have though. The high capital cost of the additional battery capacity, coupled with the limitations on usability would probably not make this a viable option in terms of economic payback. It would certainly be nice to have though.
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