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Old 02-05-2013, 11:07 PM
g9901920 g9901920 is offline
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Default Limiting Current from an Inverter?

Hi,
I'm planning on using an off-grid pure sine wave inverter,
as a current source in a "mini grid", there would be another power source which would supply the maximum load demand.

My question is; what would be the best way to limit the current drawn from the off-grid inverter, in order to prevent it from automatically shutting down, from over current demand?

Thank you.
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Old 02-09-2013, 01:27 PM
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PhantomPholly PhantomPholly is offline
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Default Re: Limiting Current from an Inverter?

Don't add anything into the circuit which could exceed the current in the inverter specification.
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Old 02-09-2013, 04:16 PM
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subcooledheatpump subcooledheatpump is offline
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Default Re: Limiting Current from an Inverter?

The best advice has been posted above, just don't connect a load too large.

If you really want to limit the current, you can add an inductor (in series) to the output, which would be a coil like a motor or transformer. Alternatively, you could also use a resistor in series.

The problem with both of these, when the current goes up, the voltage goes down. So if you had anything connected to the output that is sensitive to voltage flux, then it will shut off anyway.

If your "another power source" would supply the maximum load current, then anything hooked up the inverter would draw from the "another power source" anyway, as the inductor or resistor would limit the current in all cases, not just overload conditions. What you really need is some sort of overload contactor/relay with an interlock that will switch over from the inverter to the other power source in cases of an overload.

Last edited by subcooledheatpump; 02-09-2013 at 04:20 PM.
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