High Voltage Shutdown

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High Voltage Shutdown

Postby TRINO on Sat May 13, 2017 5:50 am

Hi, I did build my off-grid solar system 6 months ago and need help to solve some problems.

My system:
4 - Suniva panels model OPT340-72-4-100, 340w
1 - Flexmax 80 charge controller
12 - Cale batteries (mexican brand), 12v, 110 amp/hour at C20, wired in series-parallel at 48v, 330 amp/hour
1 - Pure Sine Inverter, 3000w, Mean Well Model TS-3000, 48v

My mistake as a rookie was not paying enough attention to specification on the inverter, this is supposed to work up to 62v but the actual high voltage shutdown is at 58.7v and my batteries require 59.2v for absorbing charge and 62v for equalizing.
So far I have been able to charge the batteries at specified parameters the days we are not in the cabin which is most of the time because we spend there around 5 days a month, so I leave the inverter disconnected.
The problem is when I am there I have to change the absorb setting to 57v to avoid high voltage shutdown.
Need advice on a solution to reduce the voltage before the inverter to be able to charge at recommended parameters, unfortunately the manufacturer of the inverter Mean Well USA told me they can not change the firmware to increase the high voltage setpoint and also will be very costly to ship the unit, so I need another solution.
Another problem that I have seen is that the flexmax is not maintaining the absorb voltage at 59.2v, the voltage will be around .5v higher than the setpoint so I just set the parameter 0.5v lower. Also in some conditions like when the batteries are about to be full if I connect a large load for a few seconds, for example a drill, the voltage starts to bounce back and forth around 2 volts and overshooting the 59.2 setpoint, it bounces from 60v to 58v approximately, it will stay like that until I use a large load (microwave oven) long enough to drop the voltage to 55 -56 volt, then it will reach the setpoint again and stay there stable.

I will appreciate any help.

Trino
TRINO
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Posts: 7
Joined: Mon Jan 09, 2017 11:36 am
My RE system: flexmax 80

Re: High Voltage Shutdown

Postby unicornio on Sat May 13, 2017 3:19 pm

hi, TRINO, I'm sorry to say you that with that inverter running, If you can not change that parameter, you can not have your batteries well charged, the only solution I see is that you disconnect it from the battery when you're charging ...

I really do not know why they have made such inverters, but they certainly are not made to work with a standard battery type, which makes them unusable ...

Any inverter that is well designed to work in a solar power plant would not give you that problem ... although I recommend you buy an OutBack

hope this help!
Health, Mate!
http://www.tallerecologicolosunicornios.org/ Monitor On-Line planta de energia solar: http://www.jeperez.com/monitor-solar-outback/ Servico Tecnico Oficial de OutBack en España http://www.viviendaaislada.es/
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unicornio
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Posts: 291
Joined: Thu Jun 25, 2009 9:03 am
Location: Gredos mountains,Valle del Tietar, Spain.
My RE system: VFX3024E - FM60X2 - Hub4 - FlexNet DC 3 shunts - Mate3- Array DC GFS & AC Bypass from Outback - 985 AH C120 OPzS EXIDE Solar Classic battery - KYOCERA 1,56 KWp PV Array- Lorentz ETATrack Solar Tracker with easy inclination axis variation system- 6KVA Yanmar Chinese bio-diesel genset in AGS mode via DeepSea 3110 & Mate3 - Efergy Elite energy monitor- PCE-FWS20 (Watson) Solar Meteo Station

Re: High Voltage Shutdown

Postby unicornio on Sat May 13, 2017 3:35 pm

hi again, TRINO...

If you allow me a constructive criticism, with the only encouragement to help you, not only the choice of inverter has been a mistake ... the inverter is the device that supports the peaks and rises of consumption that occur daily in a solar installation .. .infra value the work of muscle and reliability of a good inverter, which is the one that takes all the punches, is a serious error ...

But also there is a serious error that maybe these time to avoid: the association of batteries in parallel is technically something that should be avoided ... for variable and changing chemistry of batteries, you can not apply so happily the law of ohm. so I recommend you avoid it ...

anyway, hope this help!...

Health, Mate!...
http://www.tallerecologicolosunicornios.org/ Monitor On-Line planta de energia solar: http://www.jeperez.com/monitor-solar-outback/ Servico Tecnico Oficial de OutBack en España http://www.viviendaaislada.es/
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unicornio
OutBack Guru
 
Posts: 291
Joined: Thu Jun 25, 2009 9:03 am
Location: Gredos mountains,Valle del Tietar, Spain.
My RE system: VFX3024E - FM60X2 - Hub4 - FlexNet DC 3 shunts - Mate3- Array DC GFS & AC Bypass from Outback - 985 AH C120 OPzS EXIDE Solar Classic battery - KYOCERA 1,56 KWp PV Array- Lorentz ETATrack Solar Tracker with easy inclination axis variation system- 6KVA Yanmar Chinese bio-diesel genset in AGS mode via DeepSea 3110 & Mate3 - Efergy Elite energy monitor- PCE-FWS20 (Watson) Solar Meteo Station

Re: High Voltage Shutdown

Postby TRINO on Sun May 14, 2017 9:27 am

Hi Unicornio, thanks for your comments. The good thing is that we only use the system in weekends and has the weekdays to get fully charged. With respect to batteries I am planning on replacing them with 8, 6v batteries, to connect them in series, I just hope to get 2 or 3 years from the existing batteries.
Trino
TRINO
Member
 
Posts: 7
Joined: Mon Jan 09, 2017 11:36 am
My RE system: flexmax 80


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