Hello what size altenators are required to supply the inverter with enough power. We have 2 1000cca batteries.

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Get the manual :

Manual-MultiPlus-3k-230V-16A-50A-(firmware-xxxx4xx)-EN-NL-FR-DE-ES-SE.pdf

Your model is mentioned but you need to pick the right input power (the figure after the 70).

Go to §5.5.1.5 Examples (on page 17 on my version).

The first 3 dip switches (8,7 and 6) let you restrict the input power, which helps you to protect from overloading your genset. With switches 4 and 3 you can control the battery load current.

As a matter of fact the genset you connect can be a big as you want, you could even connect the multiplus to the grid. The 8,7 and 6 switches do LIMIT the input to a max value, no force the genet to deliver a minimum. In my cas with a model with 16 as the last figure, I can limit the current to 5 Amps. Read the rest of the paragraph carefully and set ALL the switches in the position you want, because by pushing the UP or DOWN button you override ALL the factory settings concerned in the table. On a new device the are all set to OFF.

Good luck and hope your Multiplus will accept the genset current which is not always the case.

@ScotiaD

Look at the complete model number, either it is 24/3000/70-16 or 24/3000/70-50. The last figure indicates the max current the Multiplus can take, 16 Amp or 50 Amp. It will not swallow anything more.

The 3000 figure means you can draw 3000W at the AC output. Making abstraction from the power factor it would mean that -theoretically- 3000 ÷ 230 ÷ 0.95 (efficiency) = 13.7 Amps is used to to supply the AC outlet, leaving 2.3 Amps to charge the battery. Or 5000 ÷ 230 ÷ 0.95 = 22.9 Amps for the 5000 model, leaving 22.1 Amps to charge the battery.

The answer to your question remains rather simple : Get a generator that can produce 16 Amps ( 3680 Watt) or 50 Amps (11500 Watt). But don't rely on the figures painted on the machine, ask for the real ratings.

@ScotiaD

The alternator should be a certain size for your battery bank. the battery manufacturer will have a spec for your model of batteries

Normally on a lead acid battery you need 10-15% of your batteries Amp/ Hour capacity as charge current, so 100 to 150 amps per 1000A/h battery to maintain battery condition.

If you just specifically want the answer to your question, 125 amps at 24 volts equals 3000 watts,

you need to allow for efficiency losses, alternator heat de-rating and target voltage which may be more than 24 volts.

Additional resources still need to be added for this topic

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