John
Two 12 volt nominal panels wired in parallel.
Battery configuration is series/parallel at 12 volts nominal
Controller (all of them) have been 12 volt nominal PWM
VPM is 17.7 VDC
IPM is 7.91
Open circuit voltage was down about 1 volt due to heat.
I have not pulled the batteries down much below surface charge so max amperage
I have observed going back into the batteries has been 5 amps but it tapers off
within about 6 minutes as the controller regulates back to float. Absorb and
float are at 15.6VDC in all cases with all the controller combinations unless I
add the AGM jumper to the controller which does lower absorb and float voltage
to Morningstars published settings with the one controller I attempted it with.
Nathan Jones
------------------------------
On Tue, Jul 17, 2012 3:41 PM CDT John DeBoever wrote:
>Nathan,
>
>
>
>Maybe the devil is in the details... Maybe the controller is confused and
>"sees" a 24V system... Just thinking...
>
>Kindly clarify few points:
>
>o At which voltage the PV array is configured? 2x PV modules in parallel
>12V or 2x PV modules in series?
>
>o Does the SunSaver Morningstar controller at the site is a 12V or a 24V
>version?
>
>o What is the Vmp of the PV module?
>
>
>
>John
>John F. DeBoever
>Global Technical & Projects Director - Renewable Energy
>Trojan Battery Company
>
>12380 Clark Street
>Santa Fe Springs, CA 90670
>Tel: +1-562-236-3000 Ext. 3139
>Cell: +1-845-514-7600 - NY office time zone: USA EST (GMT-5)
>Skype: john.f.deboever
>Fax: +1-562-236-3239
>jdeboe...@trojanbattery.com<mailto:jdeboe...@trojanbattery.com>
>www.trojanbattery.com<http://www.trojanbattery.com/>
>
>
>
>
>
>-----Original Message-----
>From: re-wrenches-boun...@lists.re-wrenches.org
>[mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Nathan Jones
>Sent: Tuesday, July 17, 2012 4:36 PM
>To: re-wrenches@lists.re-wrenches.org
>Subject: Re: [RE-wrenches] High L16 voltage situation
>
>
>
>
>
>
>
>Mick,
>
>Pesky is a nicer term than I had been using. I clamped the charge circuit and
>watched the amperage come in on final phase of absorb then drop to zero.
>(Since the voltage stayed at the same 15.6VDC when the amperage dropped off
>there was some current but my meter could not read it. That is the pesky part.
>Everything seems to be behaving as it should be. I will try the splitting of
>the parallel battery strings and check each string. And as Jay suggested, take
>a different brand of controller with me next time. What is frustrating is this
>should be as simple as things can get and yet it is so perplexing. Keeps me
>humble.
>
>Thanks,
>
>Nathan Jones
>
>
>
>
>
>------------------------------
>
>On Tue, Jul 17, 2012 11:19 AM CDT Mick Abraham wrote:
>
>
>
>>Hi, Nathan~
>
>>
>
>>Your pesky overcharge situation sounds like a real pain given the long
>
>>commute. 15.6 volts on a "12 volt" battery implies zero restriction of
>
>>the incoming energy, so this looks like a controller problem...or maybe
>
>>it's a wiring problem that prevents proper controller operation. Make
>
>>sure there's a -12 in the model number for your Morningstar Sunsaver
>
>>controls, as those are voltage specific.
>
>>
>
>>Eliminate as many variables as possible, Nathan: unhook two of the 6v
>
>>L-16's, leaving only two in a 12 volt string. Connect only one PV
>
>>module through the 12v controller and see if the voltage will regulate
>>properly.
>
>>If you have a clamp style DC ammeter, clip around one lead in the
>
>>charge circuit & read the amps with good sun. If the battery voltage
>
>>continues high while you see ~ 7-8 amps PV charge...the controller is
>
>>failing to do its job.
>
>>
>
>>Jolliness,
>
>>
>
>>Mick Abraham, Proprietor
>
>>www.abrahamsolar.com<http://www.abrahamsolar.com>
>
>>
>
>>Voice: 970-731-4675
>
>
>
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