We found the Quick Charge Chargers to be the best deal for 48 v
chargers, otherwise the Iota is good for lower voltages
https://quickcharge.com/
Ray Walters
Remote Solar
On 2/16/18 4:04 PM, Gary Rochlin wrote:
Hi Tom;
Each battery consists of 7 pack of 16 Panasonic CGR 1865D batteries making
up a 48V system from what I understand from Panasonic 1.5 kWh. The
Panasonic tech mentioned he knew of the firm and gave me the name of one if
the tech officers. I'm going to look him up and see if I can get some info
from him. Going to purchase a 48V charger and test each battery to see if
it hold a charge. Thank you for your input.
Gary Rochlin / Managing Partner
Blue Sky Energy
g.roch...@blue-sky-energy.com
310.422.2908
-----Original Message-----
From: RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] On
Behalf Of Tom Ruscitti
Sent: Saturday, February 10, 2018 12:16 PM
To: re-wrenches@lists.re-wrenches.org
Subject: Re: [RE-wrenches] Older iCel System Lithium Ion Batteries (Steve
Higgins)
Some of my non-solar consulting involves test engineering for lithium ion
materials development. I'm no expert but I do get to work with folks
developing and testing cells and sit in on industry training and conferences
now and then. I would discourage trying the jump start described here
without direct guidance from the cell / battery manufacturer and a properly
operating BMS. Li-ion batteries can be much less tolerant to over-charge and
over-discharge than the lead acid we're used to working with in the solar
business. Li-ion batteries require a strictly enforced minimum cutoff
voltage. For example, the discharge cutoff for one recent client's battery
is spec'd at 2.5V per cell. There can be damage to the anode If voltage
falls below that. Also, if you try the jump-start on compromised packs with
no BMS, different cells will charge at different rates due to differing
internal resistance (one function of BMS is cell balancing). Over-charging
can result in permanent capacity loss and also electrode damage. Depending
on the chemistry this sort of damage can increase the risk of thermal
events.
I've heard that some BMS will prevent recharging if the minimum cell voltage
limit has been busted, but no first hand experience myself. If you do a web
search on "lithium ion damage over discharge" you'll see plenty of
discussion. I tried to find specs on the iCel system but didn't find
anything useful.
be careful,
Tom
--
Tom Ruscitti
Senior Engineer
Taitem Engineering, PC
110 S. Albany Street, Ithaca, NY 14850
Mobile: (607) 220-7022
www.taitem.com
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