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I am planning on getting an off-grid/hybrid power system for my house. We have a shortage of inverters in South Africa currently.

Is it possible to have 2 inverters in parallel: one of them 48 V (5 kVA) as primary and another one a 24 V (3 kVA) as secondary?

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    $\begingroup$ Show a diagram of how you plan to connect these. Should be interesting. $\endgroup$
    – Solar Mike
    Jul 13, 2022 at 9:07
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    $\begingroup$ what Mike is saying is no, not really. $\endgroup$
    – Tiger Guy
    Jul 13, 2022 at 12:55

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No. If your battery system is 48V the 24V one will break, and if your battery system is 24V the 48V one won't work.

If you just want a spare one, in case the first one breaks in an emergency - then having the wrong voltage might be okay, but it will be very inconvenient because you'll have to rewire your batteries to get a different voltage. That might or might not be possible, depending on how many batteries you have and which type.

Off-grid inverters will break if you connect the outputs in parallel. If not for the voltage problem, you could put the inputs in parallel, but you'd still have to keep the outputs separate. You couldn't wire them both to the whole house - you could wire one to one part of the house, and the other one to a different part.

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  • $\begingroup$ Its going to be 24v lithium iron batteries . two to start with. the plan is to have the inverters in parallel. $\endgroup$
    – zunetastic
    Jul 14, 2022 at 10:31
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    $\begingroup$ @zunetastic so you have the ability to wire them in series for 48V and in parallel for 24V, but not both at the same time $\endgroup$ Jul 14, 2022 at 10:31
  • $\begingroup$ well the reason for having two is that the cost of a 7.2k single inverter here in south africa is more than buying them separate. and as a spare just in case the master one fails. $\endgroup$
    – zunetastic
    Jul 14, 2022 at 10:49
  • $\begingroup$ @zunetastic have you considered reducing your energy usage below 5k? $\endgroup$ Jul 14, 2022 at 10:50
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    $\begingroup$ @zunetastic Be aware you have other options for water heating. Heating by solar panel and inverter - that's a bunch of equipment just to make heat that the sun is giving you almost for free already! Solar water heater panels use black tubes filled with water and the sunlight heats them up, and a glass cover traps the heat. $\endgroup$ Jul 14, 2022 at 11:21

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