diy solar

diy solar

Recent content by Higher_wire

  1. Higher_wire

    LFP voltage readings

    Voc on LFP will almost always settle to between 3.3 and 3.4 V/cell when fully charged.
  2. Higher_wire

    Dc solar trailer conversion

    The REC 2Q is compatible with SI out of the box and supersedes the Q. You *might* have to program it (you'll need the wifi dongle) if you didn't specify SI with your dealer. That takes about 30 seconds. We recently outlined the process in another thread. (We are also a US dealer for REC.) As...
  3. Higher_wire

    Dc solar trailer conversion

    The SI's won't work on lithium without SOC input from an external BMS. The REC needs individual cell string voltages and shunt to measure SOC. You can't access individual cell-string voltages without disassembly of the individual packs, and even then you have 4p config so you'll want to connect...
  4. Higher_wire

    REC BMS won't talk to Sunny Island

    I wasn't aware of 250kb either, but that's what we were told by REC. Table 11 shows CHRG 2 and CANS 3 for SMA, but we got it talking with both set to 2. It wouldn't talk with CANS set to 3.
  5. Higher_wire

    Sunny Island 6048 Midnite Classic Rec BMS

    We're installing LFP packs into DC Solar trailers to replace dead lead, using REC. Depending on configuration they have one or two Sunny Islands with Midnite controllers. REC have helped us get up and running, since SI's can be a pain if comms aren't going smoothly. The new 2Q BMS has a...
  6. Higher_wire

    REC BMS won't talk to Sunny Island

    For reference, Table 11 in the manual outlines the proper CAN settings based on charger/inverter manufacturer. SMAs use either 250 or 500kb, which we just found out. From the REC BMS wifi menu, go into Firmware and scroll to the bottom. There you can send messages directly to the BMS. Select...
  7. Higher_wire

    DALY BMS Help

    Connect the load directly to the B- wire in the Daly and test. Also check that your balance leads are wired correctly, and that bus bars are tight Against battery electrodes.
  8. Higher_wire

    3kW Portable Solar Generator

    We've built a few 1kW systems using a Harbor Freight Apache 3800 case housing our 12v 100Ah LFP battery. Don't have an on-board AC charger but work really well.
  9. Higher_wire

    Darfon Gro Watt GBLI 5001 Battery Pack- worth a punt?

    We're located in Arizona, USA. Shoot a DM and we can see if that's doable.
  10. Higher_wire

    Darfon Gro Watt GBLI 5001 Battery Pack- worth a punt?

    @Tad we mix and match cells all the time. Shouldn’t be an issue if you add one new per cell-string. Spot welding is heavily dependent on a number of factors: surface finish, electrode wear, material imperfections, etc. Many hobby welders have difficulty making consistent welds. We actually use...
  11. Higher_wire

    busbar length charge/discharge battery bank balance

    Wire the cells in a row like shown (ignore green and yellow lines). Second life cells are going to have different IR regardless, so unless you've tested at 1kHz AC and balanced each string by capacity and IR you're going to have some imbalance. This way makes positive and negative leads close to...
  12. Higher_wire

    Tool Battery charging.

    They don't; we've disassembled hundreds and I can't remember a single one that didn't have a BMS in the pack itself. They're almost always passive top-balance with minimal actual balancing capabilities, but the protection is there. For reference, the smaller packs marketed as 18v and 20v are 5S...
  13. Higher_wire

    3kW Portable Solar Generator

    The foam was removed following the photos, and the ANL fuse has a cover that wasn't installed. We've tested for 30 min at 2000+ watts and it only got about 12°F over ambient inside the case. @Lazzar we do ship to australia. Most of our sales to oz are smaller - nickel strip, brackets, testers...
  14. Higher_wire

    3kW Portable Solar Generator

    Wanted to share with you all a portable solar generator we built for a customer. You may recognize the design, but we used two of our 24v 50Ah (1.3kWh) lithium batteries instead of a single 12v lead acid at the same weight. Includes a 100w AC charger, 20a MPPT charge controller, 3kW inverter, a...
  15. Higher_wire

    Big Battery planned obsolescence

    This is true of batteries in series; however, unless there is a significant difference in IR between them, batteries in parallel will stay at the same voltage and SOC. One does not charge faster than another, and amperage through each is proportional to their capacity relative to the system as a...
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