Using Load Grid Transfer with HBX

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Using Load Grid Transfer with HBX

Postby Wanbli on Mon Jan 18, 2016 3:42 pm

I have HBX set to switch to battery power when the are fully charged, then switching back to the grid at about 75% SOC. This has worked great until this Arctic Blast came through and the Mitsubishi Split Mini hvac system started sucking 6.5kw. That sucked my battery bank down to 22.7 volts pretty quickly. I have Load Grid Transfer enabled for any load >6KW for >10 seconds, but instead, it allows the battery to fall and then the genset kicks in. I checked the LGT settings and in the Mate3 it shows 6kw, in the system settings displayed on the web page for the Mate3, it shows 60.0kw!:-/

So, my question is, how do I set this up so it works as specified?

Also, battery bank will show 100% SOC but NEVER show "Full". I've tried to adjust the charge % settings up and down with no effect. Any ideas?
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Wanbli
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Posts: 10
Joined: Mon Oct 14, 2013 6:35 am
My RE system: System Name:OutBack Power Technologies
System Type:Backup
System Nominal Voltage:24 VDC
PV Array Wattage:2KW
Battery Ah Capacity:1020 Ah
Flexware 500
2-VFX3524
1-FM80
FNDC
Generator kW Rating:12.0 kW
Max Inverter Output kW:7.2 kW
Max Charger Output kW:2.8 kW

Re: Using Load Grid Transfer with HBX

Postby klundquist on Tue Jan 19, 2016 9:01 am

it allows the battery to fall and then the genset kicks in


Why does your generator kick on? Are you using AGS?

Have you tried to play around with your LGX (Load Grid Transfer) settings to see if you can get the system to connect to the grid faster? If you have your AC input set to generator (GEN) make sure to check the connect delay settings.

I don't think HBX and LGX were intended to be used at the same time.

-Kurt
Kurt Lundquist
Alpha Energy Systems Engineer
http://www.alpha.com/solar
klundquist
Alpha Energy Engineering
 
Posts: 686
Joined: Tue May 31, 2011 7:23 am
Location: Arlington, WA
My RE system: VFX3524, Mate, 200Ah 24V AGM Battery Bank

Re: Using Load Grid Transfer with HBX

Postby Wanbli on Tue Jan 19, 2016 12:57 pm

It was my understanding that HBX & LGX were designed to work together. When HBX is engaged (in a Back-up system), it's because the battery bank has exceeded the charge parameters set (see below). In LBX, if a load ensues that could exceed the capacity of the inverters (7500 watts in this case) or cause excessive battery drain (in this case it's set for 6kw) for more than a certain time frame, then LBX should transfer the system back to the grid. I believe that is the intention of the settings.

Here's how the settings appear in the Mate3 web view:

HBX High Battery Transfer:
Mode: Voltage
Low Voltage Connect Voltage: 24.2 VDC
Connect Delay: 3 Hours (In the Mate3 it is set for .3 hours)
High Voltage Disconnect: 27.8 VDC
Disconnect Delay: 1 Hours (In the Mate3 it is set for .1 hours)
SOC Connect Percentage: 75 %
SOC Disconnect Percentage: 100 %
Load Grid Transfer:
Mode: Enabled
Load Threshold kW: 60.0 kW (In the Mate3 it is set for 6kw)
Load Connect Delay: 5 Seconds
Load Disconnect Delay: 10 Seconds

I have since changed the settings to:
HBX High Battery Transfer:
Mode: Voltage or SOC
Low Voltage Connect Voltage: 24.2 VDC
Connect Delay: 1 Hours (In the Mate3 it is set as .1 hours [the lowest available setting])
High Voltage Disconnect: 27.8 VDC
Disconnect Delay: 1 Hours (In the Mate3 it is set as .1 hours [the lowest available setting])
SOC Connect Percentage: 75 %
SOC Disconnect Percentage: 100 %
Load Grid Transfer:
Mode: Enabled
Load Threshold kW: 6.0 kW (In the Mate3 it is set for .6kw)
Load Connect Delay: 5 Seconds
Load Disconnect Delay: 10 Seconds
Low Battery Connect: 24.2 VDC
High Battery Disconnect: 27.8 VDC

So, it appears that the settings in the Mate3 are all screwed up! Setting the LBX for High Loads in increments of 1/10 of an hour (a minimum of 6 minutes) up to 24 hours, is way too long (IMHO), this setting should be in Seconds or at least adjustable to less than 6 Minutes.

So now I will run at these settings until the next HBX switch and hope that the system operates as programmed.
User avatar
Wanbli
Member
 
Posts: 10
Joined: Mon Oct 14, 2013 6:35 am
My RE system: System Name:OutBack Power Technologies
System Type:Backup
System Nominal Voltage:24 VDC
PV Array Wattage:2KW
Battery Ah Capacity:1020 Ah
Flexware 500
2-VFX3524
1-FM80
FNDC
Generator kW Rating:12.0 kW
Max Inverter Output kW:7.2 kW
Max Charger Output kW:2.8 kW


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