diy solar

diy solar

Recent content by Just John

  1. J

    LifePO4 Battery - Infrequent Use.

    Depends on what you mean by a big deal. I speak from experience, storing for long periods of time at 100% will significantly reduce capacity compared to storing at 50%.
  2. J

    Looking to power HVAC

    Yes, I also have a 3-ton unit with SEER 17 installed at about that time. It can keep up with the heat, but the humidity can be a problem during the monsoon season. I've installed a 12,000 BTU minisplit that I let run on low, which really helps with that. The old unit was 10 EER and 2.5-ton unit...
  3. J

    Help!!! Settings for Daly BMS 12v 4s

    Starting balancing at 3.35v is going to cause a problem. 3.4v is the setting everyone uses for a reason.
  4. J

    Help!!! Settings for Daly BMS 12v 4s

    As long as you are using LFP cells, yes.
  5. J

    Alrska Solar Panels

    I purchased one of their 200 watt panels (12v). Compared it to some 100 watt Rich poly panels (about the same price, i.e. 2 of the 100 watt panels is about the same as a single 200 watt Alrska). Side by side, each of the Rich panels put out about 75 watts, the Alrska put out 140 watts. The...
  6. J

    MC4 extension cables

    I've been using the 8 gauge conductors when combining multiple strings. https://www.amazon.com/gp/product/B01L6OU4K4/
  7. J

    Sunfunkits show their true color

    My take (and it's worth what you paid for it, nothing): EVE changed formulation (or something) and claims 6,000 cycles on their 280AH cells, that previously had been rated for 3,000 cycles. Lots of people bought their newer 280K cells and reported not meeting amp hour capacity tests, even the...
  8. J

    Sunfunkits show their true color

    I have. I've also purchased "grade B".
  9. J

    4s BMS's that support series?

    I can confirm these work fine in series: https://www.aliexpress.us/item/3256802152358272.html I can confirm (through talking to their Alibaba support, if you order less than 5) that this is their actual storefront on AliExpress: https://www.aliexpress.com/store/1101682188 This DOES NOT...
  10. J

    JBD 4S 200A BMS

    Overkill Solar BMS app example. Only two toggles, Bal. only when charging, toggle off when trying to top balance. Start Voltage - 3400 millivolts is what you change, first to 3.45 (3450) then to 3.6 (3600). Different apps have different locations and probably nomenclature. When finished, just...
  11. J

    The perfect Aliexpress Lifepo4 order... Well, almost.

    I've used the method I mentioned for a couple of years and had zero problems. Certainly zero stripped threads. You mileage may vary. The M4 holes are factory drilled, and won't be crooked like some have reported with the "we hired someone for a dollar to tap them for you" vendor drilled holes...
  12. J

    4s BMS's that support series?

    I can confirm this one is the correct store front if you want a JBD BMS. https://dgjbd.en.alibaba.com/ I've ordered from them multiple times, and they will customize if you place a large enough order. Very prompt shipping as well. I can confirm this works well up to (and including) 4 in...
  13. J

    JBD 4S 200A BMS

    I've tested Daly, JBD and JK BMS pretty extensively. I've found the JBD to be the single brand that actually lives up to their rated claims the best, without smoking things if suddenly shut down. Daly would be the one that is least honest, and has very poor quality control. I haven't tested it...
  14. J

    DIY LiFePO4 Cost Analysis - Almost February 2023 Edition

    I've also found a cheaper source willing to customize (as in you could get it with a JK BMS rather than a Seplos BMS). https://szluyuan.en.alibaba.com/productgrouplist-916886693/Battery_box_case.html I've tried one of their cases for the 105AH EVE cells and a JBD BMS and was quite happy with...
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