How to regulate Voltage supply to the Inverter?

[sigp2101]

When in Bulk or Absorb mode Voltage seams to be too high (44-45V) for my 36V 2000W Inverter and when I apply load it goes into shut down mode protecting itself. Any way to regulate Voltage to be constant?

Any ideas?

SIGP2101

[Resthome]

When in Bulk or Absorb mode Voltage seams to be too high (44-45V) for my 36V 2000W Inverter and when I apply load it goes into shut down mode protecting itself. Any way to regulate Voltage to be constant?

Any ideas?

SIGP2101

It'S going to regulate to your Absorb set point voltage. When in Bulk it will never go above the Absorb set point and will switch to Absorb when it reach that set point.

[Westbranch]

What is the max V spec'd for the Inverter? 
Brand?


What does the maker state about excessive loads?  How long will the inverter support them?
What was the load you applied and was it > 2000W and for how long?

[sigp2101]

Bulk, Absorb, and Float are set as per manufacturer requirements. My system is 36V.
Only when the system is in rest and battery Voltage becomes stable and between 36 and 38.5V Inverter has no problem running anything up to 2000W as designed.
The problem is when Voltage reaches above mentioned values which is a normal occurrence in any charging mode.

[Resthome]

Bulk, Absorb, and Float are set as per manufacturer requirements. My system is 36V.
Only when the system is in rest and battery Voltage becomes stable and between 36 and 38.5V Inverter has no problem running anything up to 2000W as designed.
The problem is when Voltage reaches above mentioned values which is a normal occurrence in any charging mode.

Well without any more info on your system and what you have set as set points for Absorb and you inventor model and manf, it appears your invertor cN not handle the higher Absorb voltage. The voltage is regulated in Absorb and should be stable. The voltage will climb to Absorb set point when in bulk. There is nothing wrong with this or unstable. What makes you think the voltage of 44-45V is too high for your batteries. Again what do you have the Absorb voltage set point set to?

[sigp2101]

What makes you think the voltage of 44-45V is too high for your batteries.

Do not remember saying that anywhere. It seems that Voltage is too high for my Inverter, that is why I would try to regulate it somehow.
Charger Voltage Settings:    
Bulk Charge    44.5    
Float Charge    40.5    
Equalize Charge 48.6    
Operating Voltage for my Inverter seems to be 30-42VDC
http://www.ebay.com/itm/12V-24V-36V-48V-to-120V-220V-60HZ-2000W-Pure-Sine-Wave-Solar-Power-Inverter-/112078962735?hash=item1a186d402f:g:KlYAAOSwnNBXUBIO


For more particulars on my system look below.

[Eleceng1979]

Your specs per your ebay auction link
Voltage Range   30-42VDC = FAIL

You programmed the CC settings based upon the trojan manual....you read the trojan manual but not the ebay description?

[Westbranch]

the batteries are being charged with 44.5V, and your cheap inverter is not able to handle it....

Choose what you want, A NEW inverter or dead batteries in a very short time!

[sigp2101]

I new the outcome WAS ASIAN CRAP

LOL!
Can you please point me in right direction and provide at least ONE link to "quality" home made 36V solar off grid inverter?
But there is one condition only, cost must be less than entire golf cart.

In the mean time I would like to regulate my Voltage.

[sigp2101]

the batteries are being charged with 44.5V, and your cheap inverter is not able to handle it....

Inverter is doing perfectly well for what was designed to do, it supplies power to the fridge, lights and TV regardless in which mode is in at the moment. Only when I try to run 8A vacuum cleaner it turns itself off only when CC is in BULK/ABSORB mode. Any other CC mode all is running fine.

Choose what you want, A NEW inverter or dead batteries in a very short time!

Inverter got nothing to do with battery life span, especially when disconnected. Why would you say something like that?

[sigp2101]

Voltage supply TO the Batterys ?? is done under charge & volts , here you set the spec's for the batterys , hoping the inverter has similar settings . If the inverter canNOT be changed , you might risk killing the batterys early . You might tweak the voltages down slowly to see if the inverter will handle a slight adjustment .

VT

Thanks, you may be onto something here, question is will T105s handle lower ABSORB voltage well.
Or maybe tweak Inverter's operating range slightly. hmmmm... or shut down charging mode entirely for the weekend. That would fix it. Oh, can I skip 2 days every 5 days?

[TomW]

Maybe I missed it but what justifies all these issues to use 36 volts?


By this century's standards that sure seems to be an  odd voltage to work around.


There are converters around that can adapt lots of different voltages for a specific device if that is the need.


Been there, done that on trying to use gear that doesn't play well with other gear. I quit doing it.

Just saying...

Tom

[sigp2101]

Maybe I missed it but what justifies all these issues to use 36 volts?


By this century's standards that sure seems to be an  odd voltage to work around.


There are converters around that can adapt lots of different voltages for a specific device if that is the need.


Been there, done that on trying to use gear that doesn't play well with other gear. I quit doing it.

Just saying...

Tom

When you see all those golf carts zooming around green all day and get recharged over night makes you wonder why would one invent hot water all over again when someone already did it. Batteries are there, cables are there, chargers are there, fuses are there, breakers are there, dash boards are there, capacity meters are there, selenoids and bunch of other products that entire industry revolves around are there. For the smaller inexpensive start-up system like mine was no brainer.  And it works well, except one small issue I am trying to fix.

[dbcollen]

the "small issue" is actually quite a big issue for your batteries

[Vic]

   ...   question is will T105s handle lower ABSORB voltage well. (?)   ...

Hi sig,

The T-105s will "handle" a too-low Absorb voltage,  but,  they will be chronically Undercharged,  will Sulphate,  and unless frequently EQed (which will also cause the inverter to Shutdown),  will die an early death.

Of course,  as noted before,  the Inverter is the issue  --  it appears to not be able to accommodate the range of charge voltages REQUIRED by the Flooded batteries,  you appear to have.   Perhaps this inverter was designed for SLA/Gel batteries,  which generally have lower required Vabs.

Some folks have used high current Silicon diodes in the positive lead from the batteries to the inverter.   Each diode would provide 0.7 - 1.0 volts of drop.  These diodes would need a heat sink,  and each would need to be insulated from the sink,  if multiple diodes share the same heat sink.   There could be some secondary effects of not having a bi-directional current path between the batteries and the inverter,  but,  the diodes might possibly help,  if the inverter is NOT an Inverter/Charger,  and so on.

FWIW  Vic