[RE-wrenches] FX Inverter as a dumb charger

[Bill P. Battagin]

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. (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: 





BQ_BEGIN

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 
[ http://www.millersolar.com/ | www.millersolar.com ] 
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