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Wrenches,<br>
A long-time off grid client has a 48V Outback VFX system, with 1,680
watts of PV and two strings (16 batteries total) of Deka L16s,
installed last October. The array is undersized, as the system is
running three households; one efficient home and two single-person
tiny homes, but still too much for the system. We learned a few
weeks ago that the system had apparently stayed at 30-50% SOC for
the entire winter (this is approximate, as her TriMetric monitors
would eventually drift away from % accuracy if never allowed to get
full and reset). Eventually the batteries became sufficiently
sulfated that the system began shutting down.<br>
<br>
As the batteries were nearly new, we figured that the sulfation had
not yet become permanently crystallized, and they could recover. We
initiated a long "corrective equalization" from her combined
generator (45A DC from the single inverter) and MX60 controller, for
a maximum C/12.5 charge rate; less in proportion to any loads that
were on while charging. She ran this procedure for three hours/day
for five days, and when that offered only partial recovery (as
measured by specific gravity measured with a refractometer), ran for
six hours/day for five days. During this time the MX60 was also
manually set to EQ each morning, with a 62V EQ voltage and 3 hour EQ
time, so that the array would add its amperage to the gennie until
the batteries had been above this setting for three hours.<br>
<br>
We went out there yesterday, arriving while the EQ was in process.
All of the cells had recovered, as measured by SG. SG readings were
all in the 1.280 - 1.300 range, with most above 1.290. We had never
seen SG readings this high before. Given the situation and the back
story, should we have any concern about the high SG readings?<br>
<br>
Thank you,<br>
Allan<br>
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<font face="Times New Roman, Times, serif"><b>Allan Sindelar</b></font><br>
<small><a href="mailto:Allan@positiveenergysolar.com"><font
color="#000099" face="Times New Roman, Times, serif"><u>Allan@positiveenergysolar.com</u></font></a></small><font
face="Times New Roman, Times, serif"><br>
<span style="font-size: 10pt;">NABCEP Certified Photovoltaic
Installer<br>
NABCEP Certified Technical Sales Professional<br>
New Mexico EE98J Journeyman Electrician<br>
Founder and Chief Technology Officer<br>
<b>Positive Energy, Inc.</b><br>
3209 Richards Lane (note new address)<br>
Santa Fe, New Mexico 87507<br>
<b>505 424-1112</b><br>
<a href="http://www.positiveenergysolar.com/" target="_blank"><u>www.positiveenergysolar.com</u></a><o:p></o:p></span></font>
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