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Lead Acid (Sealed and flooded) / Re: 48V battery bank options?
« Last post by sidpost on Today at 12:17:00 PM »
Sid,

Do you have a link to those cells?

Mike


https://szluyuan.en.alibaba.com/product/1600066773779-818604541/Free_Shipping_to_USA_16Pcs_3_2V_280Ah_Rechargeable_Iron_Lithium_Battery_Lifepo4_Battery_for_Solar_System_for_EV.html?spm=a2700.shop_plgr.41413.16.62074c8anDz5W1

I originally stumbled on to these batteries on Aliexpress.com and had a good exchange with Amy about them. Their Alibaba listing is a little more informative IMHO.
.
Also, there is a lot of information and posting on these batteries and Amy Wan on https://diysolarforum.com/resources/luyuan-tech-basic-lifepo4-guide.151/.
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The "Classic" charge controller / Re: classic woke up into float mode
« Last post by jtdiesel65 on Today at 11:33:15 AM »
No, It's 0 on both.
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Do you have skip days set ?

Larry
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thx

Yeah, I'm not sure which is better.
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The "Classic" charge controller / classic woke up into float mode
« Last post by jtdiesel65 on Today at 10:35:33 AM »
For some reason my followme classics woke from resting state into float mode. All I can think is that it was due to battery voltage being equal (53.1) from when they went into rest and came out of rest so they just continued the mode they were it. This is with a LFP battery. SOC dropped by ~10% during rest. Both have the wbj.

any ideas ?

I set rebulk to 53.5 for now. I'll have to see what happens late day. Maybe it should be a bit lower. IIRC there was a setting to cause the classic to do nightly reboots. Anybody know where that is?

thx
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Lead Acid (Sealed and flooded) / Re: 48V battery bank options?
« Last post by qrper on April 13, 2021, 05:35:09 PM »
Sid,

Do you have a link to those cells?

Mike
7
The "Classic" charge controller / Re: aux 2 whizbang, aux 2 input, and follow me
« Last post by boB on April 13, 2021, 05:33:52 PM »

If the Classic will force to float from Aux 2 input, then the follow me should cause the other Classic(s) to follow me to float from that input.

I seem to remember that there is an Aux 2 input to stop charging so that would be the same as Resting but you are correct that Follow Me does not tell the other Classic(s) to do that.

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Lead Acid (Sealed and flooded) / Re: 48V battery bank options?
« Last post by sidpost on April 13, 2021, 04:10:02 PM »
Mike,

  Lithium today versus Lead-Acid is a lot different in terms of pricing than what you found when you bought your batteries.

  I'm specifically looking at 3.2V 280Ah Rechargeable LiFePo4 Batteries.  16 of them are $1889 at my door.  Two strings are 28,672 WHr by my math at a cost of $3778.  To that, I would need to add the cost of a BMS which is TBD at the moment.  At an ~80% discharge threshold, our use capacity is similar.

  From the pricing I have done, mainly with L16 batteries, there is no way I can come close to that capacity for a similar cost.  Not to mention the complexity of storage for servicing and the connection complexity.

Best Regards,
Sid
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Lead Acid (Sealed and flooded) / Re: 48V battery bank options?
« Last post by ClassicCrazy on April 13, 2021, 12:00:57 PM »
Pretty sure if you crunch the numbers now and shop around the Lithium are going to be the better value .

Larry
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The "Classic" charge controller / Re: reconfigure strings when moving from 24 to 48 v
« Last post by Vic on April 13, 2021, 11:32:41 AM »
Hi jt..,

WIth a 48 V  Flooded LA battery,  and a Classic 150,  it has always seemed to me that one has essentially no choice to run strings of three 72 cell PVs.   EQing cool batteries may well require Veq of about 64-ish volts,  and a string Vmp of 70-ish V (STC) is just too low,  even with Legacy P&O,  and perhaps LoMax= ON.

There would probably be some cold days,  or at least cold mornings,  where the CC would probably be in Hyper VOC,  with strings of three,  until the PV cells are warmed.

Strings of two PVs would be a bit more efficient than with three PVs,  but it is all a tradeoff.

My system is running strings of three 72 cell PVs  --  string Vmp of 106-ish volts at STC,  but we have a mild climate,  here in CA,  so,  we have never been in Hyper VOC.

Tough decision,  IMO.   MN Tech may have some added guidance.   73,   GL,   Vic
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