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" <[email protected]> To: [email protected], "RE-wrenches" <[email protected]> Cc: "Jay" <[email protected]> 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 <[email protected]> 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 ] _______________________________________________ List sponsored by Redwood Alliance Pay optional member dues here: http://re-wrenches.org List Address: [email protected] Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org There are two list archives for searching. When one doesn't work, try the other: https://www.mail-archive.com/[email protected]/ http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: http://www.re-wrenches.org/etiquette.htm Check out or update participant bios: http://www.members.re-wrenches.org BQ_END _______________________________________________ List sponsored by Redwood Alliance Pay optional member dues here: http://re-wrenches.org List Address: [email protected] Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org There are two list archives for searching. When one doesn't work, try the other: https://www.mail-archive.com/[email protected]/ http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: http://www.re-wrenches.org/etiquette.htm Check out or update participant bios: http://www.members.re-wrenches.org
_______________________________________________ List sponsored by Redwood Alliance Pay optional member dues here: http://re-wrenches.org List Address: [email protected] Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org There are two list archives for searching. When one doesn't work, try the other: https://www.mail-archive.com/[email protected]/ http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: http://www.re-wrenches.org/etiquette.htm Check out or update participant bios: http://www.members.re-wrenches.org
