Here is a good used source for 18650 batteries

[stj]

Re: Here is a good used source for 18650 batteries

honda used nimh until 2010

[eccerr0r]

Re: Here is a good used source for 18650 batteries

Thought I mentioned it... Homemade Grid tie "power wall"... down to conponents. more of a design challenge for a complete power arbitrage system. Use cheap power (solar, off peak grid electricity) to offset or overtake peak price power.

Expense of parts is one problem but with a surplus of random parts in my parts bin, I must use these when I can. Batteries are not in my surplus however.

Yes, planning to implement anti-islanding... and have an override!

[sam_sam_sam]

Re: Here is a good used source for 18650 batteries

i'll find out - a friend has one

Thanks

[stj]

Re: Here is a good used source for 18650 batteries

i'll find out - a friend has one

[sam_sam_sam]

Re: Here is a good used source for 18650 batteries

if you want a couple of hundred volts then go to a scrapyard and look at some honda hybrids.
they use NiMH cells banked to give 180-200v

What years did they make these cars with NiMH batteries in them

[sam_sam_sam]

Re: Here is a good used source for 18650 batteries

Now I found something at battery hookup that is bad ass

https://batteryhookup.com/products/d...ery-bms-switch

This is a cool little device it has two speed controller and it has a built in battery pack that surround the motor and it is powerful little motor with a battery fuel gauge on it I bought two of them but I going to buy a couple more of them for just the controller for a motor and compact it is

There is one downside of this device and it the charging controller does not have current control so I have to buy 24 volt li-ion battery charger power that limits the current or get buck converter with current control and limit it only one amp

Unfortunately they have sold out of them for now

[sam_sam_sam]

Re: Here is a good used source for 18650 batteries

Have to use SMPS to boost because I need to control and regulate the voltage too, so battery voltage still won't matter...

Can I ask you what you have in mind making because now you have me more curious than ever of you are thinking about making

[eccerr0r]

Re: Here is a good used source for 18650 batteries

Have to use SMPS to boost because I need to control and regulate the voltage too, so battery voltage still won't matter...

[stj]

Re: Here is a good used source for 18650 batteries

if you want a couple of hundred volts then go to a scrapyard and look at some honda hybrids.
they use NiMH cells banked to give 180-200v

[sam_sam_sam]

Re: Here is a good used source for 18650 batteries

I'll have to make a SMPS converter .

You might be interested in YouTube video that I just watch

https://m.youtube.com/watch?v=InWO8bmO7WA

[eccerr0r]

Re: Here is a good used source for 18650 batteries

170V=peak(120VAC RMS) and I doubt I'll get a 170V power pack, I'll have to make a boost or other SMPS converter anyway.

The 2000x 100% DoD cycles is simply to ensure I don't start losing cells after 5 cycles.

Nothing very peculiar at all IMHO.

[sam_sam_sam]

Re: Here is a good used source for 18650 batteries

Now I found something at battery hookup that is bad ass

https://batteryhookup.com/products/d...ery-bms-switch

This is a cool little device it has two speed controller and it has a built in battery pack that surround the motor and it is powerful little motor with a battery fuel gauge on it I bought two of them but I going to buy a couple more of them for just the controller for a motor and compact it is

[sam_sam_sam]

Re: Here is a good used source for 18650 batteries

how did I make it sound like I'm kidding…..hmm... (don't care what voltage) that will survive at least 2000 x 100% DoD cycles from when I take shipment...

It just has to with the way you said
( I do not care about what the voltage is and will survive 2000 X 100% DoD cycles ) from when I take shipment

Those are some very thigh specs except for the voltage requirement ( can I ask you why you need 170 volts dc for I am curious about this what do you have in mind )

The problem with battery hookup is that when you see that they have something you might want unless you buy it when you see and you come back a day later you might not see it anymore because it has sold out

[sam_sam_sam]

Re: Here is a good used source for 18650 batteries

how did I make it sound like I'm kidding

See below—>

[sam_sam_sam]

Re: Here is a good used source for 18650 batteries

For what I want to do I just need a battery pack that has enough power to last for a certain amount of time and then I would have to recharge them and the BMS/balancing/protection board cost makes me not want to go to big in milliamperes hours output

Now for the battery operated air compressor battery pack I thought about making it more than 16 milliamperes hours pack but after you run it for a while continuously it does start getting warm but this is just something that I going to use to blow things off with when fabricating a plastic part and just want something also that is portable and easy to move to another location without having to be concerned about a power outlet or extension cord

[eccerr0r]

Re: Here is a good used source for 18650 batteries

Incidentally the SPIM08HP's. to get 1kWh I'd just need 34 pieces...
now is there something even cheaper as I'd still need protection. I do have 4x 4S protection/balance boards rated at 30A... which actually is sufficient if I use all four boards in series for 60V as a 16S...

hmm...actually if I do 16S2P that would be just under 1kWh and I don't need to buy protection boards! Though that's still a chunk of money.

also 8S4P config would work too, working at the limits of the protection board if I only use 2 (30V 32A@1C). However at 60V it'd be less loss when converting to 170VDC.

947Wh (32 cells) would weigh just under 10kg =~ 22 pounds. Sigh. Sillyness is that this battery would only hold $0.10 worth of electricity... Still $130-ish/kWh.

hmm other options on batteryhookup - The samsung EV 43.2V 8.5Ah packs, if I get 7, would be $250 and would be $97/kWh. The 7pcs Jeep 44.4V 9.8Ah packs for $300 is however about $100/kWh.

[eccerr0r]

Re: Here is a good used source for 18650 batteries

how did I make it sound like I'm kidding? I guess there's a lot of constraints but they are realistic... and no weight or volume constraints... I did accidentally omit the power requirement, would like at least get 800W out of it, though 1kW is an even number.

That LTO battery set would be about $700 for that 1kWh...

[sam_sam_sam]

Re: Here is a good used source for 18650 batteries

Are you being serious about this or you just kidding

I have thought about getting this if when I have the money to buy a set of them

https://batteryhookup.com/products/6...-2-3v-20ah-lto

[eccerr0r]

Re: Here is a good used source for 18650 batteries

hmm... whats the lowest price to get 1kWh (don't care what voltage) that will survive at least 2000 x 100% DoD cycles from when I take shipment...

[sam_sam_sam]

Re: Here is a good used source for 18650 batteries

Here is an update about the battery pack for this battery operated air compressor

I have decided to use the batteries that I commented about on this post https://www.badcaps.net/forum/showth...sam_sam&page=9

I have enough batteries that tested above 8600 milliamperes hours out of 16 batteries I need 5 batteries that were close to the same milliamperes hours so I have enough to build one battery pack

I going to buy another set of 8 of them and see if I can get some that are close enough to the ones that I have to make another battery pack of 5 battery cells to make another pack

All batteries tested above 8 amperes hours but I did not have enough of them that had the same or nearly the same milliamperes hours either I would have 3 that were close to 8310 to 8350 milliamperes two were around 8400 to 8450
some were at 8100 to 8300 milliamperes hours

I just have to buy the metal enclosure that Battery Hookup has to houses this type of battery

I will post some pictures when I am finished building it