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  1. M

    How to keep Lifepo4 cells balanced without charging to 100%

    Hi. I'm building a 24v 40Ah 8S Lifepo4 pack, with an 80A JBD BMS. This will be charged with a CC/CV AC-DC Lifepo4 charger (voltage is adjustable). I have done all the top-balancing procedures, at 3.65v, and did a capacity test on each cell separately. Each one gave slightly above 40Ah...
  2. M

    DIY Lifepo4 battery box disconnect: BMS positive too?

    Hi. I'm building a DIY Lifepo4 battery in a battery box, like this: I will be putting a DC breaker on the top of the battery box, mainly as a disconnect switch, so that when doing maintenance or disconnecting the battery, the terminals won't have voltage (positive side). My question is...
  3. M

    Mr. Li 3.2v 40ah Lifepo4 cells from Aliexpress - recommendation and testing

    Hi everyone. Just wanted to share my experience so far with this seller and the cells. Some background: I'm building a DIY 24v 8S Lifepo4 pack for my dad's mobility scooter, to replace the two 12v AGMs. I know that there are other forums for this, but I have learned alot from this forum and it...
  4. M

    Proper rating for DC breaker for battery ?

    Hi there. I am planning a DIY solar generator, using Topband 25ah Lifepo4 cells (from BH). I have a 12v 1500w inverter. I would like to power loads up to this rating (around 120A at 12.8v). I have 12 25Ah cells that will be arranged in 4S3P configuration (75Ah total). Since these cells should...
  5. M

    Topband 3.2v 25Ah from BH - Testing and some questions.

    So I saw these Topband at BatteryHookup. Very popular in this forum. The deal was too good so I decided to get me a 4 pack to play with. I have no idea what I'm gonna do with them, but since ordering the 4 pack I ordered another 8. I might build a 12v battery for my UPS, and a 24v for emergency...
  6. M

    WATE 24v 8A Lifepo4 Charger (with a little secret inside)

    Hi there, I just received this 24v 8A Lifepo4 charger that I got from Aliexpress, that will be used for a 24v 40Ah DIY Lifepo4 pack I'm building. This pack will be a replacement for SLA batteries used in a small mobility scooter. The current setup uses a small 24v 2A SLA charger to charge two...
  7. M

    Mr. McKenic contact cleaner and lubricant -Anyone tried this on DIY battery?

    For my 24v Lifepo4 build, I came across this product: https://mr-mckenic.com/2019/10/23/contact-cleaner-lubricant/ Has anyone tried this on the contact/terminals of their battery? The nice thing about this specific one is that is has (conducting?) lubricant which is supposed to prevent...
  8. M

    [Review] Cheap 12v 20Ah Lifepo4 from Aliexpress (with low temp protection)

    [Update] It seems to have low temp charging protection! See my update on this: https://diysolarforum.com/threads/review-cheap-12v-20ah-lifepo4-from-aliexpress-with-low-temp-protection.31939/post-389593 I have recently recieved the 12v 20Ah battery ordered from AliExpress. I got it for $93, and...
  9. M

    Lifepo4 balancing question

    Hi there. I am planning to build an 8S 24v 40ah Lifepo4 pack for a mobility scooter. I am planning to use only 80% capacity as a charge-discharge cycle, for extended pack life. I intend to do this by charging only up to 90% SOC, and discharging to 10%. My question is: Will cell balancing work...
  10. M

    JBD BMS 60-80A - Can overcurrent be set by app ?

    Hi. I'm planning a 24v 40Ah Lifepo4 pack. The cells I plan to get state maximum discharge current of 3C. I am considering getting the 80A JBD 8S BMS. my question is can the overcurrent (discharge) protection be set by the app? For example, can I set the 80A to protect at 60A ? Is it common to...
  11. M

    Ideas needed: What to mount SCC, shunt and other components on ?

    I am planning to put an SCC, shunt, battery, fuse box and some other components inside the trunk of my hatchback, as part of my (experiment) solar build. I was wondering what would be the best "thing" to mount these on/in. I have seen many just mount the components on a piece of plywood. Seems...
  12. M

    Using only one fuse on a battery with SCC ?

    Hi there. Having seen some of Will's beginner videos and read across his site, I'm a bit confused and would appreciate your help. For example in this video, he uses only one fuse on the battery for the load and the SCC: I understand that you should have a fuse directly on the battery. Is it...
  13. M

    [Project] Extending EV range by offsetting auxiliary 12v loads using solar

    Well, I have this crazy idea that came up a while ago, and now I'm going forward to implement it. The motivation is like this: We all love solar, many of us like/have EVs. We would love to put some solar power to use in order to extend our EV range. But as some of us know, connecting solar to...
  14. M

    DC-DC Chargers - When do they stop charging?

    Hi. I have a general question about DC-DC chargers. I'm guessing that not all products are alike, but probably work the same: When does a DC-DC charger stop charging the battery to be charged? Is it based on voltage only, or based also on current? For example, if the DC-DC charger sees that the...
  15. M

    Parallel top balancing Lifepo4 vs Li-Ion

    Hi there. After seeing many YouTube videos about top balancing Lifepo4 cells by the parallel method, I was wondering why this method is recommended for Lifepo4 but not for Li-Ion cells? From what I have read, parallel balancing is dangerous for Li-Ion, because one cell with high voltage/SOC may...
  16. M

    Solarman App/Web discrepancy of daily production

    Hi. After much distress with some cheap Aliexpress microinverters, I shelled out some more cash an got a better quality Deye 2000w microinverter that uses the Solarman app and website. I love the amount of detail it gives, but there is one thing that bugs me, and I wonder if others have this...
  17. M

    Are LFP batteries suitable for electric wheelchairs/scooter?

    Hi. I was wondering if LFP batteries are suitable to replace lead-acid (AGM/SLA) batteries in an electric wheelchair/scooter? Are the rectangular batteries used for solar good for mobile applications or could they be internally damaged by the movement/bumps? Also, could they be used as a...
  18. M

    Selling some Grid-tie (micro) inverters

    Hi there. Well, in the past year and a half I have been experimenting with solar, mainly having some solar panels on my pergola. I ordered some equipment from Aliexpress, and some of it is just laying around for various reasons. I would like to sell this stuff (hopefully to someone close to me...
  19. M

    Over voltage problem with Grid-tie micro inverter

    Hi there. I have a 1200w no-name grid-tie micro inverter from Aliexpress (model GTB-1200). According to specs, it should handle 22-50v input, on each one of its 4 inputs. It has over-voltage protection. The problem is that it seems to be out of spec, and accepts voltages upto around 36v. For...
  20. M

    Splitting one panel to two inputs of a micro-inverter, what happens?

    Hi. I have a no-name MPPT micro inverter that is suppose to handle up to 600w. But, it has 2 inputs and each is limited to 300w by the specs. I have a 455w panel, which is too much for a single input. I can confirm that actual open voltage is around 45v and open circuit current is at or above...
  21. M

    Trying to make my DIY setup as safe as possible

    Hi there. I have a small (but a bit complicated) grid-tie DIY solar setup. I have been playing around with solar a bit, just to learn, but now am trying to make my DIY setup as safe as possible, given some constraints. Basically I am using those cheap no-name Chinese micro-inverters (I have...
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