<html><head><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div class="">If you stop charging a Li-ion battery when the CV (absorb voltage) is reached, you may reduce or stop the needed cell balancing time. We have had customers develop unbalanced series cells from continuous undercharging. Because of internal cell resistance, one cell will always reach saturation before others in the group. This can happen at less than 1mv difference. The more unbalanced a group of series cells are, the sooner one cells voltage will spike causing over voltage events at a lower terminal voltage. </div><div class=""><br class=""></div><div class="">Our Li batteries (Elite Power Solutions-GBS and LiFeBlue) can be held at 3.65Vpc continuously, no problems. We have customers using both MX and FM controllers for 8 years now. Our recommended setting for the Absorb timer is 0.3 hours. This allows for cell balancing and for the capacity meter to recalibrate. Some chargers will stay at CV for several hours. No problems doing this either as long as cell voltage is lower than 3.8V (LFP chem.).</div><div class=""><div style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; text-decoration: none;"><br class=""></div><div style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; text-decoration: none;">Larry Crutcher</div><div style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; text-decoration: none;">Starlight Solar Power Systems</div><div style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; text-decoration: none;"><br class=""></div><br class="Apple-interchange-newline">
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<div><br class=""><div class="">On Dec 1, 2021, at 9:38 AM, <a href="mailto:bob@midnitesolar.com" class="">bob@midnitesolar.com</a> wrote:</div><br class="Apple-interchange-newline"><div class="">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" class="">
<div class="">
<br class="">
<br class="">
Depends on the requirement for the BMS.<br class="">
<br class="">
Usually, but not 100% always, the requirement is to get the voltage
up to "absorb" and then stop charging.<br class="">
<br class="">
Just set the min and max times very low, like 1 minute and that
should satisfy that one.<br class="">
<br class="">
I do not remember if the MX60 had a Re-Bulk setting but I think it
did ?<br class="">
<br class="">
The MX did not have a logic input for turning it on and off of
course. OB had a communications<br class="">
device that converted their communications protocol to Modbus or
Ethernet I think it was which<br class="">
may (or may not) be able to make it work.<br class="">
<br class="">
Could always buy something newer and keep the MX60 as a spare. <br class="">
<br class="">
boB<br class="">
<br class="">
<br class="">
<br class="">
<div class="moz-cite-prefix">On 12/1/2021 9:10 AM, frenergy wrote:<br class="">
</div>
<blockquote type="cite" cite="mid:a01f9bad-72eb-25e9-dce6-dd55bb67708a@psln.com" class="">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" class=""><p class="">boB,</p><p class=""> Interesting...Sounds like this is not a candidate
for L-ion batteries.</p><p class="">Bill<br class="">
</p>
<div class="moz-cite-prefix">On 11/30/2021 10:47 PM, <a class="moz-txt-link-abbreviated moz-txt-link-freetext" href="mailto:bob@midnitesolar.com" moz-do-not-send="true">bob@midnitesolar.com</a>
wrote:<br class="">
</div>
<blockquote type="cite" cite="mid:a113049f-0f85-0cfe-1773-de83dce6a035@midnitesolar.com" class="">
<meta http-equiv="Content-Type" content="text/html;
charset=UTF-8" class="">
<br class="">
Hi Bill....<br class="">
<br class="">
As I remember, the min is of course... Minimum time in Absorb.<br class="">
<br class="">
Max is maximum time in absorb but depended on how long it took
to get from Bulk MPPT to that Absorb voltage.<br class="">
<br class="">
So if it took 3 hours to get to Absorb that morning and you had
t set for Max 2 hours, it would Absorb for 2 hours.<br class="">
<br class="">
If it only took 1 and 1/2 hours to reach Absorb voltage, the
MX60 would Absorb for 1 and 1/2 hours.<br class="">
<br class="">
It worked "OK" but these days I would probably just set it for
min of some 2 or 3 hours and then a max could be the same<br class="">
time or longer for FLA batteries.<br class="">
<br class="">
boB<br class="">
<br class="">
<br class="">
<br class="">
<div class="moz-cite-prefix">On 11/30/2021 7:16 PM, frenergy
wrote:<br class="">
</div>
<blockquote type="cite" cite="mid:93f93bc0-0762-2a3f-4689-9608dc864a62@psln.com" class="">
<meta http-equiv="Content-Type" content="text/html;
charset=UTF-8" class=""><p class="">Yes, the old one, not the FM. This oldie had an
interesting way to set the absorption time. You would set
the "min" time (in minutes) and you would set the "max" time
(in hours, you have to set it to 1,2,3 or 4 hours).</p><p class=""> I need to know if I set the "min" to 10 minutes
and the "max" time to one hour or two or three or four, how
long will it stay in absorb?</p><p class=""> I called Outback and Megan there didn't know
how this old fart works, apparently tech support isn't
supporting <strike class="">us</strike> their old relics.<br class="">
</p><p class="">Bill</p>
<pre class="moz-signature" cols="72">Feather River Solar Electric
Bill Battagin, Owner
4291 Nelson St.
Taylorsville, CA 95983
530.284.7849
CA Lic 874049
solar powered since 1982
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