[RE-wrenches] combining 24v and 12v systems

[Lloyd Hoffstatter]

Chris,

I would look into DC / DC converters (many available).

Happy New Year Chris and All,

Lloyd

Lloyd Hoffstatter
Sunstruck Consulting




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From: Chris Schaefer<mailto:chris at solarandwindfx.com>
Sent: Tuesday, December 31, 2019 11:52 AM
To: RE-wrenches<mailto:re-wrenches at lists.re-wrenches.org>
Subject: [RE-wrenches] combining 24v and 12v systems

G'day and Happy New Year to All,

Recently came across this offgrid OB FX system. The first part is a 12v battery system w/ 2 PV modules, 2 Trojan L16  batteries used to power a frig and freezer about 6 years old. The second is a 24v with 3kw of PV, 4 Trojan L16's, twin OB FX inverters installed by an HVAC contractor back in 2016. This was their first offgrid project. Oh boy, lol. The client would like to add more battery capacity to both. My thought here is since we are powering only a 12v frig and freezer why not simplify the system by creating a single battery bank and then tapping off of the 24v bank using proper fusing and creating a 12v buss? Admittedly I live in a 48v world so I'm asking our esteemed colleges as to options on how to address this.

Oh yeah, the installer is unresponsive (no surprise there) and they are also having firmware issues with an old Mate 3 and would like me to install a new Mate 3s but that's another issue I'll tackle when I head out to site.

Thanks All,
Christopher-

Chris Schaefer’s
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