diy solar

diy solar

Recent content by meetyg

  1. meetyg

    Smoking battery -literally “Up in Smoke”

    Very strange, as these are intended for automotive use. They should be able to handle alternator charging. Maybe it was excessive heat?
  2. meetyg

    Solar powered ebike

    The challenge I think is finding a solar panel small enough to fit the bike, but with high enough voltage to be able to charge the 48v battery. You could DIY yourself a small panel out of many miniature cells (typically a single solar cell will output 0.6v, current varies depending on the size...
  3. meetyg

    Micro inverters

    Hz...
  4. meetyg

    Micro inverters

    No, it won't work... The microinverters will up the voltage to try to "pump" as much power out from the PV, but this will make the off-grid inverter blow up, as the current has nowhere to go... This is unless you have a constant load more than the microinverters can produce. But you can't really...
  5. meetyg

    The award for the worst idea in solar energy goes to...

    Stupid idea... Not only the heat, but now your roof needs to accommodate more weight. Not sure if this is reasonable for most home residential roofs.
  6. meetyg

    JK BMS - Does It Recalculate Capacity?

    Good question... All I know is that my JKs will jump to 100% SOC if cell OVP is reached, or to 0% SOC when cell UVP is reached. What happens in between? I don't really know, but would also like to find out.
  7. meetyg

    Using DC optimisers to connect dissimilar panels in series?

    Well I did an experiment this morning: Connected each of the 455w panels and the 400w array to the SUNWIN 600W optimisers. They are pretty simple in that they don't have communications or monitoring, but it seems they do the job (how well, I don't really know, I would like your opinion). The 3...
  8. meetyg

    DIY Inrush Current Limiter solution needed

    I wouldn't trust the relay for 100a DC, nor the terminals... I just received my Tyco contactor and the 24v time delay relays today. The Tyco is for 12-24v (coil voltage) and has a built in economizer (a little PCB, which reduces coil current after initial power up). This is the one...
  9. meetyg

    Phazr JLM ENERGY put the batteries on the roof, I don’t think so!

    For sure... Yes, as I mentioned, test each cell first, then build your battery pack to whatever you need (12v,24v,48v etc...).
  10. meetyg

    Phazr JLM ENERGY put the batteries on the roof, I don’t think so!

    Roof mounted batteries? I would say that the excessive heat would kill them pretty fast. Calendar aging and excessive heat are two of known Lifepo4 killers, sometimes more than cycle life. But, I guess you could take them apart, test each cell (use an EBC-A20 or a DL24 tester) and salvage the...
  11. meetyg

    Battery Bank wiring 24v

    Option A is the way to go. That way current flows evenly across all batteries. With option B, the batteries with the main positive and negative leads might be the ones handling most of the current.
  12. meetyg

    LiFePO4 prismatic cell short circuit current and main circuit protection

    I think the problem with the first video is incorrect wiring (he mentioned it also). DC breakers should have arc chutes in them, but in polarized (polarity sensitive) these are only on one side, including magnets to pull the arc into the chute. When you run them the wrong way, the arc isn't...
  13. meetyg

    Recommendation pls for simple 24V inverter 1000-1500 W

    I have a 12v Xijia (CNSPOWER) 1500w inverter, and recently a 24v 1800w FCHAO inverter. Both are used in DIY solar generators. Both brands were reviewed by Andy (off-grid-garage.com), although different voltages. In general I can say that both of these Chinese brands are fairly reasonable. I...
  14. meetyg

    Using DC optimisers to connect dissimilar panels in series?

    The SUNWIN optimisers I was looking at don't need any keep-alive transmitters. They are also fairly cheap (around 50$ each). I guess I could get just buy 3 and experiment. Not much info on them online (at least not in English), but the specs look good to me. They don't have any monitoring...
  15. meetyg

    Using DC optimisers to connect dissimilar panels in series?

    Great! I guess I'll have to do some testing, to make sure theory meets reality. I'll probably try with and without diodes and compare. Since my PV is currently grid-tied via Deye microinverter (with monitoring), I know what to expect in regards to peak production and daily production...
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