VFXR3524A Generator hookup?

A place where users can meetup with other FlexPower One users and can find support for one another. A great place for people who have not purchased the FlexPower One yet to look up information.
Post Reply
Forum Member
Posts: 8
Joined: Mon May 13, 2019 8:05 am
My RE system: FlexPower One

VFXR3524A Generator hookup?

Post by calebcall »

I have installed a VFR3524A at my off-grid cabin. I also purchased the generator relay kit this one as that was what was recommended by the reseller (Northern Arizona Wind and Sun). However, I can't find in any documentation where I'm supposed to install the relay. I also can't figure out where the generator is supposed to wire up to. Right now I have it wired in to the AC Input and it does provide my cabin with power when I run it but it doesn't seem to charge my batteries. After a rough winter this year, my batteries are struggling to get a full charge (it also doesn't help that the last time I snow shoed in to my cabin this winter, I accidentally turned off my panels and left the inverter on :sad: I meant to turn the inverter off and leave the panels on). So I'm hoping to finally hook-up my generator the correct way and let it help keep my batteries happy until I can start to get some good sun up there.

Anyways, any advice or documentation you can point me to on where to install the relay and where I should wire the generator in to? I've read the documentation on configuring my Mate 3 for generator, I think once I can get the physical connection part right, I can figure out the rest but I'm open to any guidance.

User avatar
Kurt Lundquist
Alpha Energy Engineering
Posts: 1447
Joined: Tue May 31, 2011 7:23 am
My RE system: VFX3524, Mate3, 200Ah 24V AGM Battery Bank
Location: Arlington, WA

Re: VFXR3524A Generator hookup?

Post by Kurt Lundquist »

See page 28 of the VFXR install manual http://outbackpower.com/downloads/docum ... nstall.pdf

Check your generator manual for remote start or "two-wire" remote start. Hopefully, your generator is a two-wire style start. Three-wire style is more complicated and will not work with the relay that you have.

On the relay, the coil terminals A1/A2 go to the OutBack AUX port. The common terminal (COM) and the normally open terminal (NO) go to the gen two-wire start circuit.

For the battery charging make sure you have the inverter set to Generator mode and that you are using "Generator" input in the Mate3 programming.

Kurt Lundquist
Renewable Energy Project Engineer
Forum Junior Member
Posts: 1
Joined: Wed Feb 26, 2020 11:58 am
My RE system: FlexPower1 VFX3524

Re: VFXR3524A Generator hookup?

Post by StopperN12 »

Flexpower 1 vfx 3524. I too am looking to connect a backup Generator. The generator is a 240v output. Can this work?
Forum Emperor
Posts: 4624
Joined: Tue Jul 26, 2016 5:57 am
My RE system: Flexpower Two: (2) FXR3048A, (2) FM80, MATE3s, FlexNetDC
SimpliPhi 48-3.8 (6 @ 48v)
Outback IBR3 battery enclosure
REC Alpha 440W panels - 2 arrays: each of 4 strings of 2 in series
Honda EU7000is gas fuel generator

Re: VFXR3524A Generator hookup?

Post by raysun »

The inverter is 120V, so a 120V outlet from the generator would need to be used. If the output is 240V only, then a transformer between the generator output and the inverter input would be needed.
Post Reply