August 7, 20223 yr Good afternoon everyone. I have been surfing this forum for a few weeks now. I decided to go for a load shed kit which i purchased online. I istalled the batteries(2x200ah revov) and Kodak 3kw Inverter temporary just to see if its running okay. I will do a propper installation running to the house DB but will first obtain more info regarding this from you guys. It been running now for almost 24 hours. I downloded the watchpower app also, and when i first switched the unit on. It said my batteries are 100%. Now after a day, with no load on the inverter, my batteries are on 80%. Surely something is major wrong here. Where do i start? What did i do wrong? I attach a sreenshot of the app, and photos of my installation.
August 7, 20223 yr AFAIK Your inverter would have used power from the batteries even though only small amount of standby power, usually 30w - 80w that would/could have brought the batteries down into the flat area of the discharge curve, it should stay there for quite some time (days/weeks) if you add no loads.
August 7, 20223 yr Author The inverter was connected to the mains all the time. It is connected to a normal wall plug.
August 7, 20223 yr Author When the inverter is connected to the mains, the app shows battery 100%. When i switch of the plug, the app shows the battery is at 80%., now even lower at 72%.is there maybe a charging problem? Do i need to change any settings on he inverter?
August 7, 20223 yr Not familiar with the Kodak settings but what are your back to battery and back to utility values? That will affect when the inverter uses battery to power the loads, in this case your Inverter or any other loads you may have connected.
August 7, 20223 yr Does the inverter show the same SOC % ? Some of those apps are buggy with showing info correctly.
August 7, 20223 yr I don't see a cable between the inverter (equivalent to an Axpert VM III, I believe) and the battery. So the inverter is guessing the battery SoC based on its voltage. For LFP, this is totally inadequate. As you've seen, it makes a different guess depending on whether the mains is on. Just ignore what the inverter says about the state of charge of the battery.
August 7, 20223 yr Hi Kortsluiting I’m not familiar with the batteries but I see that they mention monitoring via an app that connects via Bluetooth to the battery. I would check the battery SOC using that app instead of the WatchTower app to be certain that you getting the correct SOC.
August 7, 20223 yr Author I also downloaded the app for the batteries. And according to that my batteris are 100%
August 7, 20223 yr 2 hours ago, WannabeSolarSparky said: AFAIK Your inverter would have used power from the batteries even though only small amount of standby power, usually 30w - 80w that would/could have brought the batteries down into the flat area of the discharge curve, it should stay there for quite some time (days/weeks) if you add no loads. At a 80W self discharge those 2 batteries will be totally discharged after 3 days with no load connected. 1920Wh in 24 hours of the total 4800Wh available. Thus from 80% SOC only 2 days.
August 7, 20223 yr 3 hours ago, Kortsluiting said: When the inverter is connected to the mains, the app shows battery 100%. When i switch of the plug, the app shows the battery is at 80%., now even lower at 72%.is there maybe a charging problem? Do i need to change any settings on he inverter? Voltage based guestimation doesn't work very exact when those batteries have a sudden voltage drop when applying load Also there's usually an inherent leech involved even with no loads
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