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I have 4 batteries of 150AH each. Earlier these were connected as series to 48v solar inverter of 3000 Watts, now as that old inverter is dead and I need to replace it with new one. I want to know which inverter is better

24v Inverter with 4 batteries in parallel of 2
or
48v Inverter with 4 battereies in series 

What are the benefits in term of charging time, backup etc

Note: 48v is costly as compare to 24v

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    \$\begingroup\$ How many Watts is the inverter? \$\endgroup\$ – mkeith Jul 22 '16 at 19:04
  • \$\begingroup\$ What voltage are your batteries? If they are 12V then you connect the 4 batteries in series to get 48V, and in series/parallel to get 24V. \$\endgroup\$ – Bruce Abbott Jul 22 '16 at 20:52
  • \$\begingroup\$ @BruceAbbot Yes u r right, I updated the question \$\endgroup\$ – coure2011 Jul 23 '16 at 0:54
  • \$\begingroup\$ @mkeith 3000 Watts \$\endgroup\$ – coure2011 Jul 23 '16 at 0:55
  • \$\begingroup\$ Bruce Abbot's answer pretty much covers it. I agree 100% with him. And that is why I asked about the power rating. \$\endgroup\$ – mkeith Jul 23 '16 at 3:38
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The advantage of 48V over 24V is that only half as much current is required to get the same power. Assuming 95% converter efficiency, for 3kW output at 24V your battery wiring has to handle 132A! At 48V it drops to a more reasonable 66A. This is actually better than you might think because power loss is proportional to current squared, so if you use your existing wiring and connectors the loss in them will be 4 times higher.

A 24V inverter might be a bit cheaper, but you should consider the cost of replacing your wiring and fuses etc. You should also consider that a cheap 24V inverter might not be as reliable as a higher quality 48V unit.

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