[RE-wrenches] FX Inverter as a dumb charger

[William Miller]

Bill:

I have too many generator amps but not enough battery charge amps. A
transformer will balance the generator but won’t increase charge amps.


William Miller
Miller Solar.com
805-438-5600
www.millersolar.com


On Fri, Nov 28, 2025 at 3:46 PM Bill P. Battagin via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> William,
>
>               Assuming the 12KW generator has 240 volt output, run the
> 240V through a transformer and double your 120 volt amps.  I guess if you
> have a spare OB 3648 in the boneyard then you would be saving the cost of a
> transformer.
>
> Bill
>
> Feather River Solar Electric
> Bill Battagin, owner
> 4291 Nelson St. (Freight)
> 5575 Genesee Rd <https://www.google.com/maps/search/5575+Genesee+Rd?entry=gmail&source=g>. (USPS, UPS)
> Taylorsville, CA  95983
> 530-284-7849, 258-1641(cell)
> CA. C10 Lic # 874049
> Solar Powered since 1982
>
>
> ------------------------------
> *From: *"Jay via RE-wrenches" <re-wrenches at lists.re-wrenches.org>
> *To: *william at millersolar.com, "RE-wrenches" <
> re-wrenches at lists.re-wrenches.org>
> *Cc: *"Jay" <jay.peltz at gmail.com>
> *Sent: *Friday, November 28, 2025 11:31:50 AM
> *Subject: *Re: [RE-wrenches] FX Inverter as a dumb charger
>
> Hi william
>
> Yes I’ve done it many times without issues
>
> On Nov 28, 2025, at 11:41 AM, William Miller via RE-wrenches <
> re-wrenches at lists.re-wrenches.org> wrote:
>
> Friends:
>
> One of my clients has one VFXR3648A inverter connected to 8 L16 batteries.
> We upgraded their generator to 12 kW.
>
> One leg of the generator is unloaded and the batteries can accept twice
> the charge current one FX can provide. It seems another inverter is called
> for.
>
> I have several functional VFXR3648 inverters on the shelf. I know I can
> not mix versions of the inverter in the hub. Could I connect a VFX3648 to
> the unused generator leg and battery bank but not the hub as a ‘dumb’
> charger?  I would plug in a Mate just long enough to verify settings.
>
> Has anyone tried this?  Thanks in advance for any advice.
>
> William Miller
> Miller Solar.com
> 805-438-5600
> www.millersolar.com
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