I second using the 48v to 12 v DC DC converter. I've had success with
that, and avoided the issues Jeremy mentioned.
Ray Walters
Remote Solar
On 2/17/2024 9:35 AM, Bradley Bassett via RE-wrenches wrote:
I powered a MidNite LSOB transmitter from a Classic AUX, though the
receivers didn't work with the Classic. The Classic is limited to
200ma output and the Tigo and APS transmitters are rated at up to
800ma input, so it might overload the Classic AUX output if they
really do draw that much.
I tested an APS RSD system recently with a Classic and it did not work
well. I believe that the Tigo transmitter is very similar since the
APS devices say "licensed by Tigo" on them, So, the Tigo RSD devices
may not work well with a Classic either.
What I recommended while at AEE was to use a 48VDC to 12VDC converter
to power the Tigo and APS transmitters. This works well. Here's the
one I recommended if it's still available: mean-well/ddr30l12
<https://www.onlinecomponents.com/mean-well/ddr30l12-50161036.html>
I never had any negative feedback using this with a Sol-Ark and APS
devices.
With a Classic in the system I've had to use the FireRaptor RSD
devices. If you can get approval or have older modules, you might be
able to follow the FireRaptor instructions and use 2 modules in series
for each FireRaptor. You do still have to have a way to disconnect the
PV output circuit from the Classic in order to make that circuit dead
from the Classic end of the circuit. I did that by putting an
MNPV6-disco on the power shed which disconnects the PV output circuit
as well as the 24VDC to the FireRaptors. And, I am powering my
FireRaptors at 15VDC and it works fine.
Brad Bassett, ret.
On Fri, Feb 16, 2024 at 6:47 PM Jeremy Rodriguez via RE-wrenches
<re-wrenches@lists.re-wrenches.org> wrote:
Has anyone successfully used a MidNite Classic CC to power a Tigo
Rapid Shutdown Transmitter in an off grid setting ? Specifically
using the 12v Aux output to keep the PV circuits alive instead of
relying on the inverter AC output to do this.
Think of this scenario. Batteries reach LBCO, inverter shuts OFF,
no PV to re charge back to LBCI, no generator backup to recharge
batteries.
Jeremy Rodriguez
Solar Installation / Design
All Solar, Inc.
1453 M St.
Penrose Colorado 81240
Sent by Jeremy's iPhone. Sorry for typos and shorthand.
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