diy solar

diy solar

Recent content by littleharbor2

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    BMS/charge controller issue

    Well, I've only had the battery operational for a few minutes. Top balanced cells, sat in parallel for a few days, I assembled the battery and tested it, But to your question, no, I read the differential after this happened, from the BMS Bluetooth.
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    BMS/charge controller issue

    It's not a balance problem. The hi-lo difference is .002 vdc. Turning on the inverter on seems to put enough load on the system to pull the voltage down out of open circuit voltage. I'm going to swap inverter and CC in the morning and see what happens.
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    BMS/charge controller issue

    Thanks for your reply, You're probably right. With these BMS's it's kind of like the chicken or the egg thing. The voltage setting on the cc wasn't set too high as I had used it for another 12 volt setup before. The battery was 99% full, if that makes any difference. I did try setting absorb...
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    BMS/charge controller issue

    I'm basically bench testing a 12 volt 305 ah. LiFePo4 battery build I'm doing for a friend for his RV. I have the battery connected to an inverter for load and a Xantrex C-60 for charging, It appears to start out working fine but then CC goes open circuit soon after connecting. This open...
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    Low sun, high sun

    Back when panels were 8 - 10 dollars a watt, trackers made sense. PV is so cheap these days it doesn't make sense to add the cost, complexity and maintenance of trackers.
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    Battery link correct ?

    I had eluded to it a couple posts ago.
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    Panels mounted past ridge of roof

    With bamboo being the fastest growing plant on earth, supposedly, you might think about adding a second story on that shed, then, adding panels.
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    Battery link correct ?

    Yep, lost again. At 48 volts you're using 1/4 the current to do the same task as you need at 12 volts. Again, you have the same amount of energy in the batteries regardless how they are wired.
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    Battery link correct ?

    4 in parallel gives 800ah @ 6 volts. 4800 watt hours or 4.8 kwh. 4 in series gives 200 ah @ 24 volts. 4800 watt hours or 4.8 kwh. 2s2p gives 400 ah @ 12 volts. 4800 watt hours or 4.8 kwh. See how that works? You still have the same amount of power, regardless how you configure them.
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    Battery link correct ?

    You'll get a 400 ah 12 volt bank with 200 ah useable.
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    From Harbor freight special 12 Volt Off Grid learning system, to new ground up build off grid solar build plan.

    You can buy a single 550 watt solar panel for about $200. You might spend more than that in connectors, fusing and mounting hardware for those crappy, old 40 watt panels.. You can pick up a 3000 watt, 24 volt AIO inverter/charger for under $400. This would be quite cost effective and simple to...
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    Building entirely new roof, how to find best angle(s) for solar?

    Another great app is "Solar Tilt". Very flexible and has GPS and a tilt gauge built in
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    12-24v allpowers controller issue

    Large loads like an inverter, for example. The load terminals can be set to turn on /off lights and that, I believe, is the intended use for them.
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    12-24v allpowers controller issue

    Being your first system, go with the lowest cost battery. Do not mix battery chemistry or sizes. Also, The load terminals on your controller are only for a single, small load. Any larger loads should connect to the battery.
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    12-24v allpowers controller issue

    The solar panel connects on the left side. Under the solar panel symbol. What are the wires connected the load (right) side?
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