70-amp adjustable PS

[MEXICOWANDERER]

Working on getting 70-amp power supplies at a fantastic price. Adjustable
Will be used to provide permanent float for my AGM. Can be series connected for 28-volts @ 70 amperes. Once set multi stages not needed. We'll see if the vendor will part with them for less than $30.00 ea.

[MEXICOWANDERER]

I wonder how they are going to manage incoming and outgoing power in a larger size bank. Cars like the Tesla use a computer and sensor array that is phenomenally complicated. It shuttles and shunts power around in the batteries like a flight controller. Then there is the cold weather issue. I have many many questions and a vendor of the two thousand dollar batteries stated to me: "There aren't any management.problems". Hmmm...

[SCVJeff]

LiPo fires are well known in the RC world, and there has been more than one house/ garage burned down because of it. All of my batteries are stored either in an Ammo Can or fire bag and charge with no flammables around them. When in use the produce a stupid amount of current and get pretty warm doing so.

[NinerBikes]

landyacht318 wrote:
Boeing has recommended that carriers do not carry Lithium batteries in their holds. It will be upto the profit seeking carriers whether they comply with this recommendation.

I have a Galaxy S4 mini. It too gets hot, and sometimes for no discernable reason and drains the battery like a drunk in a bar getting free drinks.

Even when the Phone's Wifi/ GPS are turned off, and all apps closed, it will do so. Usually rebooting the phone stops this excessive mysto battery drain. Sometimes putting it in airplane mode stops the excessive battery drain, other times not.

Invariably, this is some sort of Wifi search function gone haywire and draining your batteries, or a cell tower search function gone haywire, searching for a cell site. Pumping out pings and broadcasting packets at full wattage in search mode draws a lot of current from the batteries. Try turning off data mode and wifi mode temporarily to clear that stuff out, or reboot the phone.

[MEXICOWANDERER]

" Sometimes putting it in airplane mode stops the excessive battery drain"

Makes perfect sense. Then it sends all its excess heat to some airplane cargo hold...

[landyacht318]

Boeing has recommended that carriers do not carry Lithium batteries in their holds. It will be upto the profit seeking carriers whether they comply with this recommendation.

I have a Galaxy S4 mini. It too gets hot, and sometimes for no discernable reason and drains the battery like a drunk in a bar getting free drinks.

Even when the Phone's Wifi/ GPS are turned off, and all apps closed, it will do so. Usually rebooting the phone stops this excessive mysto battery drain. Sometimes putting it in airplane mode stops the excessive battery drain, other times not.

[JiminDenver]

I have the S4, man does it get hot sometimes. Usually when I'm running the GPS or streaming a show.

[CA_Traveler]

And recent news indicates that the LiPo batteries may be banned from airline cargo transport due to fires. This is not batteries being used by the plane rather just being transported. And the concern is that these batteries are the ones starting the fire.

[NinerBikes]

MEXICOWANDERER wrote:
When Boeing has misfires it raises my eyebrows. That is one sharp group of engineers. They had fires with LiPo. THE MILITARY REFUSES TO USE THEM in large capacity devices. I love the promise of LiPO but I am very leery of the drawbacks. Like a new medicine, new designs might encourage the development of a couple extra eyeballs when preliminary studies had shown the product to be a miracle. Electric car manufacturers spent millions developing monitoring and safety control systems for their vehicles.

The real test of a product is to turn it loose on the public, wait a couple of years then a conclusion can be reached. I simply do not trust vendors and customers opinions of a new technology product. Some of you may be too young to remember the introduction of the J.C Penney Forever battery. Or the totally miserable performance and lifespan of sealed Calcium/calcium "deep cycle" batteries.

My limited knowledge of lithium includes memories of hot as hell computer batteries and cell phone batteries that were also hot as hell in my pocket after making a long call. Education would be in order but the cost of samples to play with are far beyond my resources ability. unless they find a way to make an excellent product that can reasonably compete with AGM amp hour cost wise my interest remains subdued.

Your Galaxy S2 that I gave you uses LiIon battery packs. They don't get hot charging, because they charge so slow, maybe 300 or 400Mah rate. Not a problem dissipating the heat then. When you get a Galaxy S4 and 2000Mah charge rate and done in 45 minutes to an hour, you get some heat... I just call it good at 90% SOC and don't waste the time for the last 10%, myself.

[MEXICOWANDERER]

When Boeing has misfires it raises my eyebrows. That is one sharp group of engineers. They had fires with LiPo. THE MILITARY REFUSES TO USE THEM in large capacity devices. I love the promise of LiPO but I am very leery of the drawbacks. Like a new medicine, new designs might encourage the development of a couple extra eyeballs when preliminary studies had shown the product to be a miracle. Electric car manufacturers spent millions developing monitoring and safety control systems for their vehicles.

The real test of a product is to turn it loose on the public, wait a couple of years then a conclusion can be reached. I simply do not trust vendors and customers opinions of a new technology product. Some of you may be too young to remember the introduction of the J.C Penney Forever battery. Or the totally miserable performance and lifespan of sealed Calcium/calcium "deep cycle" batteries.

My limited knowledge of lithium includes memories of hot as hell computer batteries and cell phone batteries that were also hot as hell in my pocket after making a long call. Education would be in order but the cost of samples to play with are far beyond my resources ability. unless they find a way to make an excellent product that can reasonably compete with AGM amp hour cost wise my interest remains subdued.

[MrWizard]

it would be good to remember that these LiPo RV batteries are just a box with a number of little cells arranged in packs , and most likely with the charge control boards inside and attached to the cells
i've looked at the Prius cell replacement and battery exchange videos on the youtube and other places
the DIY EV movement buys these takes them apart test the cells and reassemble them in configurations they can use
the guy i bought my surplus AGMs from has two cars one truck and two electric motorcyles, one car was factory made, i think it was an electric Fiat
the other vehicles were conversions, he did the VW truck and one MC, he bought the VW rabbit not running but already converted to FLA, he is converting to LiPo
he showed me the installed bank with all the little charge control boards on each cell pack, and pointed out the weak cells he needed to replace
this tech is NOT yet plug and play, its more like "Tinker & Pray"
not saying you can't buy LiPo boxed and ready to go..you can, but its expensive
and when an internal cell pack gets weak, its replace the whole thing,
or learn a whole lot about LiPo internals and how to do it safely

[NinerBikes]

MEXICOWANDERER wrote:
Each chemistry has it's own quirks. With lithium, I have no idea at all if the battery could withstand max absorbsion voltage inrush. There's a question of monitoring temperature that I have not studied. A few months ago I looked online for white papers on the subject but ran into a blank wall. There is more to the subject than meets the eye. I do not trust vendor "sales-before-logic" rhetoric.

A power supply that may be forward compatible with other chemistrys would be good, if at all possible, in the parameter designs. Maybe look at PD's product lineup now, with lithium batteries in the mix.

Or play dumb, call them up, ask the engineers some questions about the differences in charging of various battery chemistry? PD and IOTA for starters?

[MEXICOWANDERER]

Each chemistry has it's own quirks. With lithium, I have no idea at all if the battery could withstand max absorbsion voltage inrush. There's a question of monitoring temperature that I have not studied. A few months ago I looked online for white papers on the subject but ran into a blank wall. There is more to the subject than meets the eye. I do not trust vendor "sales-before-logic" rhetoric.

[MrWizard]

i don't think its voltage "shortage"

its constant voltage, no matter what amps the batteries or system is using
set 14.1v and it will be there whether you are using 50amps or if the batteries are at float with no load, thats fine for AGM..

with FLA its a matter of out gassing set 13.2v float and the charging will be slow
set 13.8v float and when its 100F your batteries will outgas too much and you will be "watering" them a lot
FLA on storage dropping to a voltage where there is NO out gassing is a must

[NinerBikes]

MEXICOWANDERER wrote:
Apparently I have "lift-off" on the power supplies
Deal has been struck. Free Shipping bulk packaged. Units have paralleling ports. Unfit for flooded batteries these critters are for VRB only.

Shortage of what, max voltage? Are they forward compatible with different battery chemistry, like LiFePo4, which some say you should charge at 13.6V to 90% not 14.4V to 100%, it's hard on battery life cycles?