diy solar

diy solar

Our NEW GO-TO LiFePO4 vendor...09.20.21

Hey all, just wanted to chime in and relay our experience with @Jenny Wu and Docan.

I had initially ordered four 304Ah EVE cells for our class C RV while in deep in Michigan's Upper Peninsula (we're full timers.) There was a misunderstanding, but after coming to the realization that they were not in stock in Houston, I quickly contacted Jenny and had the order changed to 280Ah cells. Fortunately they still had enough stock to cover my paltry request, sure enough they were shipped the next day, and they were waiting for us upon our arrival back in the LP.

Packaging was robust, no damage whatsoever and no swollen cells. Three of four started out at 3.285v, the fourth at 3.284. Eager to get started, I built a compression fixture and proceeded to charge and top balance the cells. Everything went great, and I write this post now on our second day of use with no charging, significant use of a desktop PC with three monitors (me) and a 40" TV with full surround system (little mama) along with all the other regular usage, and 173.49Ah still in the bank.

We are absolutely thrilled. I wanted to extend a personal "thank you" to Jenny Wu for getting us squared away on our first step into lithium and the last step of our complete off-grid independence. She went above and beyond to make sure our little order was taken care of amongst, I am sure, requests for quantities much larger than ours.

So thanks Jenny... now get some sleep! :)(y)
 
Last edited:
So my boss this morning stopped by the DONCAN warehouse (Doncan Technology (Shenzhen) Co) in Houston TEXAS to pick up (64) EVE-280Ah batteries that we had ordered literally 48 hours earlier.

From beginning to end this has been a 10 out of 10 process.

First it started with Jenny Wu of Doncan Technology (Shenzhen) Co in China ... https://docantech.en.alibaba.com/?s...95a76e98Gh7yZ&tracelog=from_orderlist_company ... her English is better than mine and she completely understood our requirements and how we very concerned about paying for GRADE A's and getting GRADE B's 75 days later.

SOOOO the solution they have is that they have a location in Houston with stock available. There stock changes daily of course BUT Jenny can tell you exactly what they have at the time of order.

THEY DO NOT HAVE A LOCATION IN CA AS I HAD EARLIER THOUGHT THEY WOULD. ONLY HOUSTON

You can literally order the equipment from Jenny in China, send her the funds, and go and pick them up the next day. Or it seems that way to me - as long as they have the stocks.

She also has the capability of telling you exactly what they have in their US Warehouses and when different shipments will be arriving.

AND also - they can SHIP from an American warehouse directly to you so cutting your 75 days down to just a handful. You will have to pay shipping from probably CA but - and I am just guessing - but since they are shipping them from CA to Houston anyway - perhaps them shipping from CA to you (instead of houston) may not cost much more - you would have to talk to Jenny about that.

Prices are fluid I am sure due to the economy falling apart - but I think that we paid $125 per 280Ah battery plus I sure some Credit Card fee (my boss took care of all of that so not sure) ... BUT YES not the cheapest when all said and done - BUT we were able to check the batteries out right then and there - touch them - hug them - sniff them (no Biden pun intended, well maybe a little) ...

take a look at the pictures below ... we were extremely happy with what we got.

Boss said at Houston he worked with an absolutely great girl by the name of Jenny Wade who is in charge there. Everything was ready - she allowed him to randomly open various boxes (2 batteries per box - 32 boxes total) so he could look at them.

He called me and told me that these were the best packed boxes he had ever seen - and they even had the little EVE caps on the + and - ...

Not much else to say - I think Jenny is on this board as @Jenny Wu but I have not looked for her.

As a side note they actually also sell GRADE-B batteries but they are only like 10-15 dollars cheaper so why even bother ....

But they carry LISCHEN, CATL and EVE ... and all various sizes ... to be honest I think that right now they only have 280Ah and 304's in stock -- and maybe 200's since that seems to be the biggest market but AGAIN - you will need to reach out to Jenny

For the record - we have ZERO to do with this company. I nor anyone here gets any type of discount or freebie or anything and the moment something goes amiss I will drop them like a rock and let you know -- but from the packaging, the batteries appearance, the the great customer service, etc -i think that they will be my go to people for a while ...

ANYWAY - when you talk / email / chat with Jenny let her know that you saw her info on this forum @Jenny Wu and it may help - or at least she will know that there are about 10,000 forum members standing behind you so pretty sure they will not try to put anything over on you ... LOL

I am testing 2 of the batteries right now so will let you know in 24 hours how they stood up to the capacity tests ...

View attachment 65582



View attachment 65583

View attachment 65584View attachment 65585
I just wanted to thank you for sharing.
 
New guy here, I just received my first order of 100ah CALB cells and want to thank Jenny Wu for a perfect transaction and this forum for hooking me up! I'm afraid I'm heading into a new addiction?
 
Just ordered and paid for my 16 x 280ah Eve cells from Jenny @ Docan. Great comms and price including shipping to the UK.

Shame I have to wait a few weeks now for them to turn up :-(

Thanks @Jenny Wu
 
Just received the pallet of 280Ah cells I ordered shipped out of Texas. Shipping wasn't as steamlined as I would like, but it was the carrier's fault, not the shipper. I receive freight shipments fairly regularly and these cells are the best packed shipment I've ever received. I'm used to seeing really beat up freight. A few of the boxes were hit with something during transit, but the shipper uses so much foam around the cells that I'm pretty confident the cells are in good condition even though I haven't opened those boxes yet.

Tonight I'll be unpacking inspecting, weighing, and volt testing the cells. After that, grouping cells, top balancing, assembling packs, and capacity testing.

Very good experience with Jenny and Docan Technology so far.

IMG_20211021_110654.jpg

The foam completely encloses the cells. Well protected, but kind of a pain to unpack and I'm going to have to make a trip to the dump. Better than damaged goods though.

IMG_20211021_110657.jpg

The boxes are thick cardboard and almost completely covered in tape.

IMG_20211021_110733.jpg

My only criticism at this point is that the boxes weren't wrapped to the pallet. You can see the load shifted a bit during transit. Wrapping all the way down typically prevents that. It probably isn't a problem with this shipment, but it certainly could have been.

IMG_20211021_110759.jpg
 
Hi @tigerwillow1

Thanks for your inquiry. There's no RS 485, but some with bluetooth and some not. There ARE limitations to using 4 of them as a 48 volt battery.
They are on the way to Houston warehouse now. The ETA is 24th Nov. You can contact with me @Jenny Wu or @Amy Zheng directly for more details. Both are okay. Thanks.
Thank you for the info. This is a rare treat to get such a fast and informed response!
 
And tell us why FedEx is the worst.


Well they lost a box of 3 cells of mine. Won't even begin to look for em. Each box has a barcode on it and is scanned. They had it and it disappeared. Called and they said too bad so sad nothing they can do. If I don't like it contact shipper in China and tell them to file a claim.
Shipper in China says they have called several times and emailed them and no contact back. I just had to pay $550 to ship the cells to my house via air.
 
Just finishing up first 12v 280ah pack.

I would like to congratulate you for properly fusing your battery. Today, I'm moving my four 12v packs from wooden compression racks to SunFunKits boxes. I will also use MRBF fuses right on the battery post like you. I'll post pictures and a review of the SFK boxes when I'm done.

Where did you get those flexible bus bars?

Thanks
 
I'll chime in with another positive review. Quick responses to questions. Easy purchase process. 3 days after payment I received pictures of cells being packaged with my name on the box. Coming from China. 16 pieces of EVE 160ah to join my already commissioned Lishen 150 pack.
 

"Better power density than cable with lower skin effect ratio"

For DC (and 60 Hz ripple) applications?
:ROFLMAO:

Not that it causes any harm.

The lower skin effect would be due to rectangular cross section, larger surface area compared to round cable of same cross sectional area.
The flat laminations of these, and the multiple strands of cable, do nothing for skin effect.

These should be good for flexibility, reducing stress on terminals. So long as installed with a curve to allow motion of the ends.

"1.26 in. x 0.039 in., 189.46 kcmil"
"Length: 3 m"
"$246.10"

:ROFLMAO: :ROFLMAO:
 
"Better power density than cable with lower skin effect ratio"

For DC (and 60 Hz ripple) applications?
:ROFLMAO:

Not that it causes any harm.

Don't underestimate this. I've directly observed the difference between cables and busbars. It adversely affected my BMS due to high voltage fluctuations in the cell-level readings, causing inappropriate balancing, SoC auto-adjustments, etc. I abandoned cables in favor of bus bars for these reasons.
 
Don't underestimate this. I've directly observed the difference between cables and busbars. It adversely affected my BMS due to high voltage fluctuations in the cell-level readings, causing inappropriate balancing, SoC auto-adjustments, etc. I abandoned cables in favor of bus bars for these reasons.

I recall you showing photos of a big bank on racks, and making this change.

Do you get a difference in DC voltage drop, or AC voltage (seen by oscilloscope) along length of busbar?
How about difference in contact resistance between cell terminal and cable terminal? Or cable terminal to cable strands?

How do DC resistance measurements compare (if you have a way to do that.)

I've done the math on skin depth, using idealized models in engineering school.
At very high frequencies, surface roughness becomes part of the path length.

I take measurements of resistance and reactance vs. frequency for various components like chokes and transformers, using a meter that goes from 20 Hz to 100 kHz. The values change a lot over low frequency, and differ vs. DC ohms.

I also have designed, measured, used RF components, including 11 MHz transformers I hand wound with 30 awg wire-wrap wire, and procured from a vendor for production.

So my work doesn't exactly match busbar applications. I don't have equipment for high current tests other than battery/inverter and AC grid/resistive loads. But I have difficulty understanding how laminations vs. strands make a difference for battery DC 60 Hz ripple currents. I would hope kHz ripple from switcher is handled by capacitors in inverter.
 
I would like to congratulate you for properly fusing your battery. Today, I'm moving my four 12v packs from wooden compression racks to SunFunKits boxes. I will also use MRBF fuses right on the battery post like you. I'll post pictures and a review of the SFK boxes when I'm done.

Where did you get those flexible bus bars?

Thanks
I got like 80” for around $100.00 shipped from galco.com it is three layer and rated for 250amps.
 
Back
Top