splunker Posted June 5, 2023 Share Posted June 5, 2023 (edited) Hello Please can I get some info on the Power column in the Deye Time of Use settings. Looking through a few chats I see ranges from 4000 to 5000. Is it a charge rate? I've heard that some systems can charge batteries faster at the expense of battery life so if that is what it is I'd prefer to grid charge slowly. My battery manual doesn't mention anything that appears to match. It's was set to 5000 by the installer. Thanks very much Deye 5KW inverter 2 x Volta Stage 1 5.12 KWh batteries 8 x Astroenergy all black mono half cut 400W panels Edited June 5, 2023 by splunker Added hardware info Quote Link to comment Share on other sites More sharing options...
GreenFields Posted June 6, 2023 Share Posted June 6, 2023 You can achieve what you want under the battery settings by limiting the charge amps to say 40A per battery. Under the time of use, that's a max discharge rate from the battery, and if you need more power it comes from grid. For example if you want to cover baseload through the night from battery and want to keep some power for loadshedding later, but then feel like a midnight snack. splunker 1 Quote Link to comment Share on other sites More sharing options...
splunker Posted June 6, 2023 Author Share Posted June 6, 2023 3 hours ago, GreenFields said: You can achieve what you want under the battery settings by limiting the charge amps to say 40A per battery. Under the time of use, that's a max discharge rate from the battery, and if you need more power it comes from grid. For example if you want to cover baseload through the night from battery and want to keep some power for loadshedding later, but then feel like a midnight snack. Ahh ok thank you. Much appreciated. Snack planning is critical Quote Link to comment Share on other sites More sharing options...
splunker Posted June 6, 2023 Author Share Posted June 6, 2023 Thanks for the above. Looking at the battery settings and it looks like the grid charge is already on 40A. Not sure if that's considered 'per battery ' though. Out of interest, are there any formulas or rules of thumb for what constitutes low, med or high charge rates? How does this relate to the max charge rate in the other screen. Is that an upper limit, regardless of energy source? It also much higher than 40 in my case. Maybe it's for the combined battery (2x100A). Lastly, are these fields populated by the battery BMS? Thank you and apologies for all the questions. Quote Link to comment Share on other sites More sharing options...
GreenFields Posted June 6, 2023 Share Posted June 6, 2023 The 100A Max A Charge rate on the Batt Mode page is a global limit, and it's basically at the limit of what the 5kW Deye inverter can supply as charge amps. If you have 2x Volta batteries, in theory each one can take a 100A charge all by itself, but on this inverter they are getting max just 50A each, which is a "normal" slower rate of charge for example for 0.5C batteries. That's well below the limits of the battery's capability, but in reality I don't think you are going to be reaching even this. You have 3.2kW of solar power connected, that can supply maximum around 65A charge current in total, or 32A per battery. And then your grid charge current is currently 40A, or at most 20A per battery. Personal opinion is to increase the grid charge amps so you get to a desired minimum charge level more quickly, whenever you then want to charge from grid. Maybe set grid charge to 80A, so you are also still operating the inverter well within its limits. Just my 2c, might be wrong, might mean nothing at all, just try out what works for you at own risk. splunker 1 Quote Link to comment Share on other sites More sharing options...
splunker Posted June 6, 2023 Author Share Posted June 6, 2023 Thanks very much. Having this sort of context is very valuable. Quote Link to comment Share on other sites More sharing options...
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