diy solar

diy solar

Most reacted posts

  • Post in thread: My Friend Was Banned For "Self-Promotion?"

    No... They often get sneaky and get someone to do it for them or join under an alias and promote the stuff pretending to be a customer or potential customer... I remember uno batteries doing this and getting flatout caught doing in on a golf cart forum.. I got banned from the facebook page for...
  • Post in thread: Got my cells from aliexpress today.

    Back in november (6th) I ordered 16 "90ah" cells from Global power co on aliexpress. I knew I was taking a risk but the feedback from others was mostly positive and they are a "top brand" seller. anyway the cells arrived today 2 days before the deliver by deadline. the barcode shows them as...
  • Post in thread: Got my cells from aliexpress today.

    https://www.aliexpress.us/item/2251832870353882.html?spm=a2g0o.order_list.order_list_main.39.18ba1802EJe55m&gatewayAdapt=glo2usa&_randl_shipto=US
  • Post in thread: Ryobi Zero-Turn Mower SLA to LiFePo4 Conversion - (Updated - Build Complete With Pics!)

    I realize this is an old thread but for those reading this, you absolutely do not need to keep these batteries warm during the winter as you should NOT be mowing or more importantly charging them . Its also a bad idea to store them fully charged during this time so keeping them on the charger...
  • Post in thread: Purchase obviously scam Alliexpress batteries just to see what you would get

    I have well over 3000 ebay transactions now and I have only been burned once. I have bought from dead beat scammer sellers a couple times now but ebay has always refunded me. I dont know if you noticed but amazons sorting algorithm was designed to make it very difficult to sort products by price...
  • Post in thread: EVE identifies Grade B cells using new marking Method [Reposting from General]

    I for one commend them for trying to mark their cells so people could tell what they were.... Damned if you do damned if you dont. I guess everyone wants to be able to choose to plausible deniability that their grade B stuff is grade A
  • Post in thread: Ryobi Zero-Turn Mower SLA to LiFePo4 Conversion - (Updated - Build Complete With Pics!)

    That will work. and 50ah is plenty for the 480rm mower since it never draws 50amps (typically its below 30amps when mowing ) and a 50ah lifepo4 battery will give about the same runtime as a 100-125ah lead acid. I connect my charger directly to my pack and dont bother with the onboard port. I...
  • Post in thread: JBD BMS not balancing?

    I added an active balancer for this and at first I had it on a switch so I could manually turn it on and off when charging.. then I added a voltage activated relay which turns it off once the pack gets below 3.37v per cell.
  • Post in thread: How long can you (and your family) survive if the grid went down for an extended period?

    So what your saying is its the armed totalitarians that will form the looting mobs? I think your oversimplified stereotyping would't last you too long if the Sh#t did hit the fan... Theres a lot of folks that park themselves right in the middle in the middle between the extremists in the common...
  • Post in thread: How much does the Chinese resellers get the grade B cells

    When you buy a factory second pair of levis at a discount store do they include documentation as to why they are $12 instead of $60? All that documenting and keeping track of each failed cell costs money. They likely just get yanked off whatever test bed they fail for whatever reason and get...
  • Post in thread: EVE identifies Grade B cells using new marking Method [Reposting from General]

    Like solid state relays they typically fail closed... typically contacts of any type dont stick and weld themselves to nothing so it only makes sense they would typically stick on. If the failure was catastrophic ive seen the circuit open back up but ive seen most mosfets stick closed.
  • Post in thread: Ryobi Zero-Turn Mower SLA to LiFePo4 Conversion - (Updated - Build Complete With Pics!)

    just want to clear up this misconception. I keep seeing people in this thread talking about being afraid to go with 50ah or 60ah cells because they wont be enough. This in reality completely depends on if 1c or 2c cells are being used. the actual amp draw while mowing depends on what model...
  • Post in thread: How much does the Chinese resellers get the grade B cells

    Ive read they auction them.. as for a % matching I doubt your going to find any true consistency to why and how they compare to grade A they can fail for multiple resons some of which may not even effect performance, especially in solar low c applications.
  • Post in thread: DIY 16s 48V Cells

    Hes building a golf cart pack. Most commercial golf cart packs are 175a or more continuous discharge and are 105ah or less.. a 105ah pack is normally good for 30-40miles. the performance carts sometimes need more with the 500-600amp controllers and high torque motors. many use the 300/600amp...
  • Post in thread: Active balancer, make it smart!?

    Well it seems this thread has gone more in the direction of a uart based solution but for reference I was able to get this to work.. I removed the relay and soldered it remotley with wires to open and close the contacts at the desired voltage
  • Post in thread: Got my cells from aliexpress today.

    almost fully charged..
  • Post in thread: A-grade 304 Eve cells - fake, or real? What to expect?

    Curious/ whats the weight difference between a legit 304 cell and a 280? do you know?
  • Post in thread: Ryobi Zero-Turn Mower SLA to LiFePo4 Conversion - (Updated - Build Complete With Pics!)

    I have built a couple packs now for golf carts and decided to buy a broken rm480e which needed a controller after getting it working I found the 4 year old batteries barely have enough charge to get through my 1/2acre lawn... So I ordered 3- fiat 5 cell lithium ion packs for $99 each from the...
  • Post in thread: Active balancer, make it smart!?

    Its working good for me.
  • Post in thread: New Battery Build -- did I ruin the cells

    Keep in mind the ambient air temp isnt necessarily what the internals of the battery would be... For example if temps were below 32 degrees consistently for a few days the battery migh stay below freezing temp wise for a bit longer even after the temp comes up.. The same works in reverse. I...
  • Post in thread: Are we all getting GRADE B cells??

    I just want to point out that I agree while paying with another means is ideal, I have a brewery and a few years ago I found the manufacturer that makes the equipment thats rebranded and sold in the US at a 300% markup... anyway I did in fact pay them with a bank transfer (partial payment...
  • Post in thread: 280 EVE vs 302 CATL for camper.

    I went from 6 -6volt golf cart batteries wired for 12v to a single 230ah diy battery from docan and for the first time I can even reliably run my coffee maker without draining my battery bank. even th 280ah battery will be much more usable capacity than you had with the golf cart batteries. If...
  • Post in thread: 4 new Himassi Lifepo smart bluetooth 12v100ah batteries and testing - simple observations.

    Just my thoughts here but not letting the battery charge till 50 degrees is likely because the manufacturer is not confident that the center of the cells is above freezing until the area where the temp probes are located is at and maintains 50 degrees.. when you heat a piece of meat in an oven...
  • Post in thread: Purchase obviously scam Alliexpress batteries just to see what you would get

    I did this once... then found out they dont ship anything they send you a fake tracking number I was kinda my own fault because the pricing was completely unrealistic even for aliexpress pricing. I made an impulse buy and realized this afterwards. I got my money back and then did my homework...
  • Post in thread: Connecting up Six LiFePO4

    There is one drawback of the parallel wiring.. And that is the reduction of capable current from the pack available to the load which can still cause a chain reaction of the bms all shutting down. If the load is never high enough to trip the remaining bms overcurrent protection then this doesnt...
  • Post in thread: EVE identifies Grade B cells using new marking Method [Reposting from General]

    I understand they are not mechanical relays but they are both forms of electric relays/switches. (there are no contacts or moving parts in a solid state relay either) As a field engineer I can think of a particular board in a particular machine ive been servicing for years that has a tendency...
  • Post in thread: When will the 18650 explode?

    I got into a bit of heated discussion about this myself as I would agree with you but I was shown data and articles at the time that stated both are technically a form of lithium ion battery. maybe those articles were wrong? I dont know
  • Post in thread: Lifepo4 for 350 amp?

    well I was comparing the 150a version the US seller had to this one...
  • Post in thread: TechDirect BYD BMS in pre-built units: Can anyone read this Chinese label?

    Big Battery recently broke up with their manufacturer (Battery EVO) The specs big battery were using seem to be inflated from the actual manufacturers specs on the same batteries they also sell under thier own brand... They even recommend and sell the wrong voltage charger (58.8v) to go with...
  • Post in thread: Anyone have experience with multiple cheap mppt boost charge controllers like you would use in a solar golf cart setup or ebike charging?

    so I have a 48v lithium powerd cart with a 360w 42v panel as a roof... im currently using one of those cheap green MPT-7210a units and it works but when theres even the slightest shadow or a bird flies overhead it resets back to zero and takes a bit to get back to charging.. just looking for...
Back
Top