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jason-inzana avatar image

How to wire an auxiliary fan on Multiplus 12/3000?

Could someone please share how they wired an auxiliary fan with a Multiplus 12/3000? I've read a couple other posts that mention setup of the assistants, and I've set up 2 (one ON and one OFF) through the K1 relay. However, the documentation isn't very clear on what the NO/NC/COM ports are actually doing when the assistants are setup to "turn on". I understand NO = normally open, NC = normally closed, and COM is the common. I've tried wiring a couple different ways and haven't had success with the auxiliary fan turning on following the inverter fan. It is a 12v, 0.16A 120mm computer fan. I've tried wiring directly to the K1 relay port, using the NO as power supply and common as battery negative. I've also tried providing power separately via a 4-pin relay, treating the NO port like a switch+.

MultiPlus Quattro Inverter Charger
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Matthias Lange - DE avatar image
Matthias Lange - DE answered ·

The relay acts like a switch. Connect the negative of the fan directly to the negative of the battery (or the negative post inside the MultiPlus), a wire from the positive through a fuse to COM and from NO to the positive of the fan.

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Matthias, thank you for the quick reply! Just want to confirm my diagram below represents your suggested solution. It wasn't clear if you meant connect COM to BATT+ or FAN+. I think you meant BATT+ since you said it is a switch and this implies power isn't routed through the Multi. I chose a 3A fuse since the data sheet mentions the relay is rated to 4A at 12V.

Thanks again!

auxiliary-fan-wire-diagram-k1-relay-on-multiplus.png