FNDC LOW SOC AUDIBLE ALARM?

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FNDC LOW SOC AUDIBLE ALARM?

Postby Ozbeild on Fri Nov 18, 2016 10:27 pm

People using my house who do not understand solar may cause expensive damage to my WLA batteries by drawing down the SOC below 80% by inadvertently leaving on air conditioning etc. At $10,000 a set of batteries I want to have an audible alarm that I can use to tell them to switch off all large household loads. I would use a simple switch to break the alarm circuit when triggered and then reset it when the SOC has risen. How can I set up an alarm? I have an FNDC and a Mate3.
Ozbeild
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My RE system: Off-Grid system in Australia with 5,500w mixed pv panels, feeding 3 x Outback MMPT chargers, Hub 10, stacked VFX3024 inverters in parallel and Raylite wet cell batteries in a 24v configuration at 1660 Ah. Outback Mate3 and FlexnetDC installed. LAN wifi monitoring, but not gone to Optics.

Re: FNDC LOW SOC AUDIBLE ALARM?

Postby SandyP on Sat Nov 19, 2016 2:05 am

Edit : Yes the FNDC has an AUX set point that can activate the AUX relay for low SOC :

AUX Relay Set Points
...
...
SOC (State-of-Charge) LO—a low state-of-charge activates the Aux
....

Look at the FNDC manual (?page16?) : Programming the Auxiliary Relay

---------------------------------------------------------------------


Not sure if the FNDC would have a better way however, using the Outback inverter's AUX function triggered by the battery voltage seen by the inverter you could either trigger an alarm (using the genalert) or use the load shed option to drop large load(s).

ADJUSTABLE AUX OUTPUT FUNCTIONS
There are four AUX functions whose settings can be adjusted by the user:
Diversion
Vent Fan
GenAlert <----- or,
Load Shed <-----

The loadshed off set point is the battery voltage
which triggers the AUX to reduce the inverter
and battery loads. When the battery voltage
drops below this value for three seconds, the
AUX powers a DC coil relay to disconnect an AC
load. Once triggered, loadshed remains on for at
least three minutes. The loadshed off set point
is adjustable from10 VDC-14VDC using the <INC> and
<DEC> soft keys.

Note : In your case the set point will be from 20 to 28VDC.
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My RE system: 8 x 190W 24V Suntech panels (4 strings of 2)
Mate2
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12 x 2V Hoppecke GEL 660 Ah C100 - 24V System
Outback VFX3024 Inverter/Charger
Victron BMV-602s
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Re: FNDC LOW SOC AUDIBLE ALARM?

Postby Ozbeild on Sat Nov 19, 2016 5:21 pm

Thanks Sandy. Will investigate
Ozbeild
Forum Member
 
Posts: 8
Joined: Fri Feb 06, 2015 11:04 pm
My RE system: Off-Grid system in Australia with 5,500w mixed pv panels, feeding 3 x Outback MMPT chargers, Hub 10, stacked VFX3024 inverters in parallel and Raylite wet cell batteries in a 24v configuration at 1660 Ah. Outback Mate3 and FlexnetDC installed. LAN wifi monitoring, but not gone to Optics.


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