Posted March 27, 20231 yr Guys out of curiosity, how long would 2 x 200aH run on a 3KVA inverter with the usage of 450Wh Edited March 27, 20231 yr by UDC
March 27, 20231 yr Surely you mean 450W. If those are Lead Acid batteries and it's a 24V system and the batteries are 100% then you have a theoretical 4800Wh total. Ideally you never use LA batteries lower than 50% SOC to prolong the life. Thus a theoretical 2400WH would be the max recommended usage. 2400/450 = 5,3 hours At 450W load you can thus run a comfortable 5 hours without shortening the lifespan unnecessarily.
March 27, 20231 yr Author 19 minutes ago, zsde said: Surely you mean 450W. If those are Lead Acid batteries and it's a 24V system and the batteries are 100% then you have a theoretical 4800Wh total. Ideally you never use LA batteries lower than 50% SOC to prolong the life. Thus a theoretical 2400WH would be the max recommended usage. 2400/450 = 5,3 hours At 450W load you can thus run a comfortable 5 hours without shortening the lifespan unnecessarily. thank you
March 27, 20231 yr Author 48 minutes ago, zsde said: Surely you mean 450W. If those are Lead Acid batteries and it's a 24V system and the batteries are 100% then you have a theoretical 4800Wh total. Ideally you never use LA batteries lower than 50% SOC to prolong the life. Thus a theoretical 2400WH would be the max recommended usage. 2400/450 = 5,3 hours At 450W load you can thus run a comfortable 5 hours without shortening the lifespan unnecessarily. sorry...how did you get 4800Wh is it V x Ah I am using 2 x 200Ah batteries.....so would it be 24 x 400Ah = 9600Wh
March 27, 20231 yr 12 minutes ago, UDC said: I am using 2 x 200Ah batteries.....so would it be 24 x 400Ah = 9600Wh 2 batteries in series doubles the voltage not the Amps. 12v 200Ah in series becomes 24V X 200Ah = 4800Wh 2 batteries in parallel doubles the amps whilst the voltage remains the same. 12V 200Ah in parallel = 12V X 400Ah = 4800Wh
March 27, 20231 yr Author 8 minutes ago, zsde said: 2 batteries in series doubles the voltage not the Amps. 12v 200Ah in series becomes 24V X 200Ah = 4800Wh 2 batteries in parallel doubles the amps whilst the voltage remains the same. 12V 200Ah in parallel = 12V X 400Ah = 4800Wh perfect, thanks
March 28, 20231 yr Author sorry...another silly question....when adding batteries, do I have to match the current batteries in terms of the battery Ah values. basically can I add another 2 x 100Ah batteries or does all 4 batteries have to be the same spec
March 28, 20231 yr Hi @UDC, When paring up lead acid batteries you want to make sure that they are almost identical, so definitely the same Ah rating, same chemistry and preferably same brand. Deviating from this would lead to the inferior of the batteries overworking and reduced life span of the battery bank as a whole. However should you feel that you would like to add the 2 x 100Ah batteries to your system I would recommend that you setup both battery banks as separate battery banks. You could then use a battery Isolator switch with combination function to prevent the system from turning off when you switch from one battery bank to the other. These can often be found in boating supply shops such as from the link below: https://seaportsupply.co.za/product/switch-battery-e-4-position-aft/
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