February 15, 20251 yr Hi All, This is what I would like to achieve: Since the battery is only 2.4kW, I want to ensure it remains fully charged in case of a power outage or load shedding. The battery should be recharged solely by the solar panels. How should I configure the inverter? My current settings work, but the battery drains to 80% (or less) when no solar power is available. Thanks for all your comments and suggestions!
February 15, 20251 yr Hi @jjvvuuren thanks for the feedback from the previous tries. Shame it does not work. To summarize, you want to use you system like this (correct me if I'm wrong): Working like an online UPS (backup power supply) Battery have to stay fully charged at all times, and discharge only during power outages or loadshedding Self-consumption of the inverter should be satisfied from the grid Recharge depleted battery from the PV I'm afraid that the above is not possible with Deye directly, therefore we have to use a couple of tricks. Deye always uses PV and Battery for it's self-consumption. Once there's no PV, it starts to take from the battery. Therefore we have to continuosly refill the battery from the grid, if we want to keep it charged. This is something what "Zero-export Power=100" should do, as it would force inverter to pull 100W from the grid and that 100W would go to the loads or to the battery to keep it full. Since it does not work apparently, there's just one trick that I can suggest: Return back Zero-export Power=20 Set the values on WorkMode2 screen this way: How this should work: it tells the inverter to keep battery at 95% SOC at all time, using the grid. You dont' have to wait for the night, just disconnect the PV and wait hour or two to check how it behaves. If this won't work then I am out of ideas, sorry. Edited February 15, 20251 yr by Youda
February 15, 20251 yr 2 hours ago, Youda said: Hi @jjvvuuren thanks for the feedback from the previous tries. Shame it does not work. To summarize, you want to use you system like this (correct me if I'm wrong): Working like an online UPS (backup power supply) Battery have to stay fully charged at all times, and discharge only during power outages or loadshedding Self-consumption of the inverter should be satisfied from the grid Recharge depleted battery from the PV I'm afraid that the above is not possible with Deye directly, therefore we have to use a couple of tricks. Deye always uses PV and Battery for it's self-consumption. Once there's no PV, it starts to take from the battery. Therefore we have to continuosly refill the battery from the grid, if we want to keep it charged. This is something what "Zero-export Power=100" should do, as it would force inverter to pull 100W from the grid and that 100W would go to the loads or to the battery to keep it full. Since it does not work apparently, there's just one trick that I can suggest: Return back Zero-export Power=20 Set the values on WorkMode2 screen this way: How this should work: it tells the inverter to keep battery at 95% SOC at all time, using the grid. You dont' have to wait for the night, just disconnect the PV and wait hour or two to check how it behaves. If this won't work then I am out of ideas, sorry. @Youda Thanks for the great suggestion. I will give it a try.
February 16, 20251 yr On 2025/02/15 at 1:23 PM, jjvvuuren said: @Youda Thanks for the great suggestion. I will give it a try. On the Synsynk, to achieve what you want to do, you have to enable Time Of Use, set it to 100% and tick Grid charge. This will keep the battery at 100%. Deye would work the same.
February 16, 20251 yr What happens when you set all of the below: 1. Time-of-Use active, and 100% Batt percentage in all time slots. 2. Power = 0 in all time slots 3. Grid charge - no ticks, blank in all time slots 4. Zero export power = 80-100W
February 17, 20251 yr 1 hour ago, jjvvuuren said: Thanks for all the suggestions. My suggestionj is: get more battery capacity... As far as I am aware, the Deye/Sunkensynk inverters run off the battery for their own consumption, I assume this is, so that when the power fails, there is no switchover to the battery for the inverter itself... Keeping the battery at 100%, topped up all the time is not good for the battery, you are shortening its life by doing this...
February 17, 20251 yr 5 hours ago, Kalahari Meerkat said: My suggestionj is: get more battery capacity... As far as I am aware, the Deye/Sunkensynk inverters run off the battery for their own consumption, I assume this is, so that when the power fails, there is no switchover to the battery for the inverter itself... Keeping the battery at 100%, topped up all the time is not good for the battery, you are shortening its life by doing this... @Kalahari Meerkat Thanks for the suggestion.
February 19, 20251 yr On 2025/02/15 at 10:22 AM, Youda said: Hi @jjvvuuren thanks for the feedback from the previous tries. Shame it does not work. To summarize, you want to use you system like this (correct me if I'm wrong): Working like an online UPS (backup power supply) Battery have to stay fully charged at all times, and discharge only during power outages or loadshedding Self-consumption of the inverter should be satisfied from the grid Recharge depleted battery from the PV I'm afraid that the above is not possible with Deye directly, therefore we have to use a couple of tricks. Deye always uses PV and Battery for it's self-consumption. Once there's no PV, it starts to take from the battery. Therefore we have to continuosly refill the battery from the grid, if we want to keep it charged. This is something what "Zero-export Power=100" should do, as it would force inverter to pull 100W from the grid and that 100W would go to the loads or to the battery to keep it full. Since it does not work apparently, there's just one trick that I can suggest: Return back Zero-export Power=20 Set the values on WorkMode2 screen this way: How this should work: it tells the inverter to keep battery at 95% SOC at all time, using the grid. You dont' have to wait for the night, just disconnect the PV and wait hour or two to check how it behaves. If this won't work then I am out of ideas, sorry. Some feedback. This is currently my best solution for the moment. Thanks for all your suggestions.
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