diy solar

diy solar

Recent content by DIYSteve

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    Off-grid Solar / Battery monitoring and control freeware

    I don't have much Raspberry Pi programming experience but I have just got a Pi 3b and a Pi 4. I have a EPEVER Tracer 4015BN and a Tracer 3015BN running two solar arrays, (both have a eLog01 which allows a MT50 and a RS485 to USB cable to be connected simultaneously, added benefit of the eLog01...
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    Data Logging from two EPEVER MPPT SCC

    My Pi's recently turned up so I can start looking into working with them. I am new to anything Linux based but I am looking for ways to interface with the SCC's. Maybe there is a RS485 Pi Hat.
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    Data Logging from two EPEVER MPPT SCC

    Still have not achieved this myself. I have emailed EPEVER and they say that they have not made it possible. On my 40a controller I also have a eLog01, MT50 and USB connection. The eLog01 makes it possible for all to be connected together. I have just ordered the same for my 30a controller. I am...
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    MPPT Issues on Epever 5420AN Tracer Charge Controller

    Sorry read wrong, reply deleted
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    Can I combine these two old 50w panels in series with a new 390w panel for a 12v battery?

    As mentioned above, you would benefit so much better adding the two 50w panels on a cheap PWM solar controller than you would adding them in seriesbthen parallel with the other. Add another 1-3 of the larger panels to the EPEVER 40a controller for a decent system
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    Two different solar arrays to charge MPTT (EpEver Tracer 30A)

    I have two solar arrays also using two EPEVER Tracer BN series controllers. One is a 40a controller and the other is a 30a. Originally I purchased a 40a but they accidentally sent me a 30a, when I bought it to their attention they quickly apologised and sent me the 40a. I tried a few times to...
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    Data Logging from two EPEVER MPPT SCC

    Cool, I have recently ordered a Raspberry Pi 4B from the UK so it should arrive in a couple of weeks, I will watch the video and definetly give it a go. Thank you very much Samsonite for your suggestion, I will most likely have stock of any modules, mosfets and other components required for...
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    Data Logging from two EPEVER MPPT SCC

    Hello, I have two EPEVER Tracer BN series SCC's, the downloadable software can only track one controller at a time. I would like to get logs from both to show the generated solar each month. Is there any device, DIY or Buy, that can be connected to both controllers and log the data onto my...
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    Panasonic CGR18650CG 4S módem router back up

    Your right, I assumed you would tie it to the supply before the AC to DC adaptor. It does make a lot more sense to just tie both DC lines together. You could add a charger to the cells that only kicks in at about 75% SOC.
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    Panasonic CGR18650CG 4S módem router back up

    You would need to design a circuit with a relay to switch between AC supply and the backup lithium pack. The AC to DC converter that normally supplies power to your modem will also need an attached circuit to recharge the lithium pack when required. Secondly the lithium pack will need a...
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    My Back-Of-The-Envelope Calculation

    There are ways to cut your power expectations down a lot. Using 12v fans that run through a channel of 6-8 12v Peltier cells with the hot side being blown outside would help cool things down. Peltier cells can make a decent fridge so why not a mild air conditioner. There are many ways to convert...
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    Can someone tell me the difference between EPEVER 40a MPPT Contollers?

    I am using the EPEVER Tracer 4215BN it's a later design and stays cool. If you want to use a MT50 or wifi as well as the USB you can add the eLog01 which stores data for a couple of months to be downloaded onto computer as well as breaking out the RS485 to a RS485 and a USB outlet. The eLog01...
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    Matching solar panel voltages

    The MPPT Controller cannot show the VOC as this is the panels open circuit (or unconnected) voltage. Once the panels are connected to the SCC they are in a circuit so only the voltage reaching the SCC can be measured. When connected in parallel it is the lowest voltage that's matched, the...
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    Matching solar panel voltages

    I am assuming that the 38v panel was it's open circuit voltage so most likely a decent 24v panel. This is why I suggested pairing 2x 12 volt panels in series then parallel connecting everything to the SCC. If I was wrong about the 38v being it's open circuit voltage then disregard my suggestion.
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