A mystery to me..... [RE-wrenches]
penobscotsolar at midmaine.com
penobscotsolar at midmaine.com
Sun Oct 19 13:34:09 PDT 2003
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Hi Matt,
Thanks, I checked the batteries somewhat but I'll do better when I next go
up there. One thing I left out is that when the leg with the well pump went
on and dragged the inverter down the battery bank went down to 16.7 volts
from 54.4 v Do you still think it might be the batteries? I hear you when
you say more than one crimp could be bad..... Remember, this is a single
series string of 2 volt cells.
Daryl
Penobscot Solar Design
Matt Tritt writes:
> Daryl,
>
> I'd bet that the problem is with the batteries, not the inverter.
>
> I would check for a bad inter-battery connection or a series-string
> connection, possibly a bad crimp(s). Dropping to 27.2 volts would
> indicate that the problem is at the end of a 4 battery string.
>
> Matt T
>
> -----Original Message-----
> From: penobscotsolar at midmaine.com [mailto:penobscotsolar at midmaine.com]
> Sent: Saturday, October 18, 2003 2:19 PM
> To: RE-wrenches at topica.com
> Subject: A mystery to me..... [RE-wrenches]
>
>
> Hello all,
> I'm having no success in troubleshooting a system we installed almost
> two
> years ago that is three hours travel time each way. It has operated
> flawlessly since installation. We have had no lightning in the area for
> months.
> The system is an SW4048-PP with 24 Surrette KS-25 batteries. It was
> originally set up for generator only use (against my recommendations)
> but
> they quickly added a 1.2 KW array within the year. We aded an Outback
> MX-60
> to the system this last July.
> I arrived at the site with replacement inverter in hand. We started
> up
> the original inverter with manual bypass breakers both off. It ran fine,
>
> starting up and going into search after 20 seconds or so. Setting it to
> ON,
> again, it ran fine. We turned off the main in the house and threw the
> inverter breaker in the bypass and it continued to run fine. We turned
> off
> all the breakers in the main panel and turned the main on and it ran
> fine.
> We threw the first breaker and it continued to run fine. We turned off
> the
> first breaker and continued in this manner until we threw a breaker (
> labeled track lighting) and I saw the battery voltage suddenly drop from
>
> 54.4 volts to 27.2. The inverter shut down with no error reading and
> without
> any breaker tripping anywhere. We shut off this breaker and turned the
> inverter back on. It ran fine.
> We continued on and found 2 breakers which powered sub-panels both
> had
> the same effect. One sub powered a Grundfos 1/3 hp SQ-O series 110 VAC
> submersible, among other things (mostly lights in the room where the sub
>
> panel is). It seemed as though certain loads were dragging the inverter
> down.
> To shorten this story, we replaced the inverter and voila! the same
> problem!!!!!
> When they power the house with the generator through the manual
> bypass
> switch everything runs fine. The system has separate structure ground
> (for
> the array) and system ground (the electrical systems ground)
> WHAT AM I MISSING???
> Daryl
> Penobscot Solar Design
>
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