Posted April 7, 20231 yr Hello, I had a system installed few days ago. Deye 5KW inverter and 2x Dyness 5kw BX51100 batteries. Panels coming when they eventually get stock. I have a few questions to those who know more than me about these things: 1. The installer said the system is set to only discharge the batteries to 30%. Is this normal? 2. The batteries never reach a full charge? They get to 80% of max capacity and then stop charging? Surely this is not normal. See attached pics. Is this a setting on inverter causing this or faulty batteries? Or is this normal? So, if the system is set to only discharge the batteries to 30% and only charge to maximum 80%, that means I only get 50% usage form a battery? What's the point of Lithium then, as this is the same % I can get from cheaper lead-acid, no? Feedback or input much appreciated.
April 7, 20231 yr You know you can change the settings right? It's not a lithium issue but an installer setting issue You can discharge them to 20% regularly with no perceptible impact on life. The 80% top end is probably due to the Voltage settings the Installer chose. Is the battery connected to the inverter with comms? I have 3 * 48100s and they charge to 100%
April 7, 20231 yr 25 minutes ago, flyfisherman said: 1. The installer said the system is set to only discharge the batteries to 30%. Is this normal? 2. The batteries never reach a full charge? They get to 80% of max capacity and then stop charging? Surely this is not normal. See attached pics. Is this a setting on inverter causing this or faulty batteries? Or is this normal? This can be changed under the settings, probably the System Work Mode for the 80% limit, and the 30% under the battery settings. There are plausible reasons why someone might want to keep those settings. The maximum 80% charge from grid allows the balance to be topped up from solar, and 30% allows a small margin of reserve for loadshedding when it hits. All depends on what works best for you, what you want out of the system, and you'll probably keep changing it with more and more user experience.
April 7, 20231 yr 5 minutes ago, GreenFields said: This can be changed under the settings, probably the System Work Mode for the 80% limit, and the 30% under the battery settings. There are plausible reasons why someone might want to keep those settings. The maximum 80% charge from grid allows the balance to be topped up from solar, and 30% allows a small margin of reserve for loadshedding when it hits. All depends on what works best for you, what you want out of the system, and you'll probably keep changing it with more and more user experience. I know on the sunsynk even if you have set the grid to charge your batteries to 100% ,the solar will be used first to charge batteries before the grid BUT this depends on ones settings.My 3 x Hubble am2 are set at 99%,grid and use timer set and I very rarely use the grid to charge batteries.If I have used batteries at night then i make sure my ac is switched off so no grid can be used.The sun comes up and priority is the house load and once that is satified then the balance goes to the batteries so no eskom.
April 7, 20231 yr Author 11 minutes ago, mzezman said: Share you battery settings screens for us to input Hi, will take a pic of the settings once I get home, many thanks.
April 7, 20231 yr Author 14 minutes ago, GreenFields said: This can be changed under the settings, probably the System Work Mode for the 80% limit, and the 30% under the battery settings. There are plausible reasons why someone might want to keep those settings. The maximum 80% charge from grid allows the balance to be topped up from solar, and 30% allows a small margin of reserve for loadshedding when it hits. All depends on what works best for you, what you want out of the system, and you'll probably keep changing it with more and more user experience. Awesome, thanks for the reply. I guess it is best then to wait for the solar to arrive next week and then re-visit the settings to find what works best.
April 9, 20231 yr Author Hi, apologies for the late reply, but got sidetracked So, these are the settings as left by the installer. This is for a Deye 5KW inverter and 2x dyness BX51100 batteries. No solar yet. They arrive in one month only apparently. As mentioned, currently the batteries don't charge to 100%, only 80%. I now know why Some of the other settings also don't seem 100% correct? I think. Would someone be able to look over the rest of the settings and advise if they seem reasonable? System has been installed for like total 4 days now. For now, I just need the system to run off Eskom when Eskom is on, and battery during loadshedding, until I get my panels. So kind of like a UPS.
April 11, 20231 yr When you have no panels, its ideal to keep your batteries full not to cycle them. I would set the time of use to 100% so the batteries stay full waiting for load shedding. When panels are installed then you can cycle your batteries to a certain percentage and leave enough energy to push through load shedding. Discharging them to 60% is not bad
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