Posted June 22, 201510 yr Hi, Can someone please enlighten me on Depth of Discharge, and how to apply it on an inverter? Many sites on the internet suggest that you run your batteries on 50% DOD, or even 30%, in order to let the batteries last longer. So, now the first question is: 1. How do I calculate 50% DOD, on a 48V battery bank? Let's work with 12V as a reference since that's the "industry standard battery". From what I know a full battery is 13.8V. Is "empty" then at 10.5V, or 11V? And is this under load, or with no load connected? 2. What is best, to start charging batteries at 50%, or 70%? I have an Axpect 5KVA inverter with 48V 250Ah battery bank, if that helps at all?
June 22, 201510 yr Hi SN DOD is a percentage but one can only measure the batteries Voltage. In a rest state i.e. no draw it is easy to infer DOD from voltage. However when there is a load the voltage is lower. How much lower is dependant on the rate of discharge. I am no expert so that is as much as I know. Therefore the R2K investment in a decent battery monitor is essential unless you charge controller or inverter come with a built in battery monitor which records the flow out/in of/to the batteries. Chris
June 24, 201510 yr If you have Flooded Lead Acid battries, you can easily check the SOC (State of Charge) with a Hydrometer.
June 25, 201510 yr Author Thank you. I have sealed lead acid batteries, so can't use a Hydrometer. The reason I am asking is cause I want to set the right settings on an Axpert inverter, for charging, switch-off, etc, in order for my batteries to last many years
June 25, 201510 yr Have a look at this thread.... http://powerforum.co.za/topic/163-battery-dischargevoltage-levels-and-load-question/
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.