June 6, 20233 yr Hi guys, first of all I love this forum and reading it last few days in order to learn as much as I can but still I am failing to understand what should be charging voltage of my system, I have 5KW inverter https://voltronicpower.com/en-US/Product/Detail/Axpert-MKS-1KVA-5KVA I also have 4 of there Exide batteries https://www.supac.co.uk/product/9004108/exide-gel-es2400 Only thing I was able to find regarding them is https://unimar.hr/Documents/product_manual/1240803_3_1.pdf where it says constant voltage should be 14.1 If you can share the what would be your recommended charging voltages it would be really helpful This is my current setup Bulk charging voltage: 57v Float charging: 54.4 Battery cut off: 46v Battery equalization is off Thanks Edited June 6, 20233 yr by Nemke
June 6, 20233 yr Welcome Nemke, Is there nothing on the battery labels itself regarding Bulk and Float? In the absence of that, you listed doc states "With Solar System 14,2V constant", which I would translate as the Bulk based on these two bullet points. U phase or U1 phase (main charging phase) with constant voltage between 14.1 and 14.4 V U2 phase (charge retention) with constant voltage of 13.8 V That would be 14,2V X 4 = 56,8V Bulk 13,8V (charge retention) X 4 = 55,2V Float Stand to be corrected Then also just as a reminder, try to stay above 50% SOC with any Lead Acid based battery type and they should give you many years of reliable service. 50% would be in the region of 48,3V.
June 6, 20233 yr It also refers to the 13,8V float but refers to the upper end of the bulk, i.e. 14,4V X 4 = 57,6V, but this they state should only be done once a month, which in my view is the typical equalisation process. Let's see what the experienced Lead Acid users can add.
June 6, 20233 yr Author One thing @zsde this are not Lead Acid but Gel batteries. I mean not sure does it matter but just wanted to point that out. Thanks again .
June 6, 20233 yr Gel and AGM are also Lead Acid Based. https://www.foxtronpowersolutions.com/gel-battery-vs-lead-acid/ Edited June 6, 20233 yr by zsde link added
June 6, 20233 yr Author Thats why I am here, to learn, anyhow I set Bulk charging to 56.8 Float Charging to 55.2 If anyone think this is not right please let me know.
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