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  1. Master Dalor

    24v mppsolar unit wiring

    Hello capt. I don't know if he found out, but if I understand the question now, He wants to know the needed wire gauge. I=p/v 2700/110=~25amp. The fuse 30A is ok. If we follow the rules of 5A for 1 sqmm, 30/5=6 minimum witch is close to 9gauge cable. 12gauge is close to 3.3 sqmm, 15amp max or...
  2. Master Dalor

    Batteries Not Keeping Up

    Wow. I didn't thought the charge controller could only accept 260W at 12V. Better go 24V.
  3. Master Dalor

    Batteries Not Keeping Up

    Hello. 100w panel will produce about 5amps in the best conditions, during 1 hour, you get 5Ah. During 1 summer day, maybe you had 5h sun, 5days x 5hours x 5 ampères = 125Ah Now, with shadow/bad weather, maybe it produces less than 1amp, you should measure it with the ammeter. With 20A mppt...
  4. Master Dalor

    Recommended settings for a homemade ( out of 18650 used cells ) lithium ion battery 7S60P 135 Ah ( 24V )

    @Pindrix I found An example: Design and manufacture by Yousun Overcharge Detection Voltage: 4.200V Overcharge Release Voltage: 4.170V Cell-balancing Detection Voltage: 4.160V Cell-balancing Release Voltage: 4.150V Overdischarge Detection Voltage: 2.800V Overdischarge Release Voltage: 3.00V...
  5. Master Dalor

    Using 8S BMS on 7S Battery for a Trolling Motor

    Hello. I read your post again, I don't know how, I understood you couldn't find 7s bms. Sorry. I can't confirm your idea of using 8 s bms for 7s batteries, but it works with active balance bords 8s board for 7s batteries.
  6. Master Dalor

    Recommended settings for a homemade ( out of 18650 used cells ) lithium ion battery 7S60P 135 Ah ( 24V )

    Hi all. I found that illustration, on https://lygte-info.dk/info/BatteryLowVoltage UK.html, very interesting page. Are your cells new?
  7. Master Dalor

    DC to DC charger / battery compatibility

    I just read renogy's response again, I'm not sure what he means saying it charges 50% in the starting battery and 50% in the house battery, but, it makes me think that the pv should recharge also the starting battery, and maybe there could be a conflict somewhere, when the starting battery is...
  8. Master Dalor

    DC to DC charger / battery compatibility

    No problem. :) I might add that the small converter 0.5v 30v has built in diodes to not feed the current back in, in the case, later if you want to charge batteries directy with it. You can add diodes on the 3806, but than the voltage reading wouldn't be accurate on his screen, because of the...
  9. Master Dalor

    DC to DC charger / battery compatibility

    As you said, if it's advisable to connect the car battery to both in, battery and solar, witch I'm not sure it is, it would most likely go to 50 amps, and the solar side wouldn't recognize the 12.7 volt low battery state, and maybe kill it and the alternator aslo, instead, you could go thru a...
  10. Master Dalor

    how to modify a car alternator for 48v charging

    Hello. I half agree, because even double amp alternator still need enough rpm to cool down, I'm not in boat engines, but I suppose it's sometimes at idle rpm, and you'll need to limit your amp draw to the power the alternator can give at idle to not smoke, that's not much divided by 4 and 90%...
  11. Master Dalor

    Travel trailer - 24v battery - buck converter question

    Ah ok. Thanks, sorry, I must have missed posts, you know I'm a newbie in the forum. ;)
  12. Master Dalor

    how to modify a car alternator for 48v charging

    Hello efficient pv. Depending on the rpm, the alternator stator produces different variable voltage and frequency, the regulator energising the rotor winding modifies the magnetic field of the rotor. The magnetic field becomes weaker with higher rpm to keep stable voltage output. To use the 3...
  13. Master Dalor

    DC to DC charger / battery compatibility

    It makes some sense, he just read the description like we did first, having no other information.
  14. Master Dalor

    24v mppsolar unit wiring

    Ok sorry.
  15. Master Dalor

    Travel trailer - 24v battery - buck converter question

    Hello. Do you intend to keep those deep cycle baterries or to replace them with the 24V 280Ah lifepo4 battery bank? Is your 24V 12V dc to dc converter meant to power the loads or to charge another battery? It seems that in the actual configuration the legacy distribution panel is directly...
  16. Master Dalor

    24v mppsolar unit wiring

    Hello Ernie. Your mpp solar is meant to charge a battery, all the loads are connected on the battery too, if they are 24V DC. Too power the 110V AC loads, you need to transform 24V DC with the use of a pure sine inverter. You need to size the complete installation to match the power needed by...
  17. Master Dalor

    DC to DC charger / battery compatibility

    Ok. It will be fine. Thank you, Miles, I've learned some more things, and thank you Joey, for digging, and make me dig too. See you.
  18. Master Dalor

    DC to DC charger / battery compatibility

    Ok, it pulled 51 Amps, but from a battle born which as no voltage sag, the lead acid starting battery will sag, and will rapidly get under 12.7V especially just after engine starting not being sucked off see at 4:10 the charge will resume from 13.2V. In the test he says that the charger senses...
  19. Master Dalor

    DC to DC charger / battery compatibility

    I can't see any model number, when I receive it, I'll tell you.
  20. Master Dalor

    DC to DC charger / battery compatibility

    The second battery will disconnect if starting battery is under 12.7 V with traditional alternator, 11.5V with smart alternator witch is connected to the controller with communication cable, so, the 50amps are given by the starting battery, not overloading the alternator.
  21. Master Dalor

    DC to DC charger / battery compatibility

    on here it states 25 amps from alternator
  22. Master Dalor

    DC to DC charger / battery compatibility

    I will use that in my van.
  23. Master Dalor

    Parallel connection of two BMS for one battery.

    hello I found that video, he talks about 2bmss at the end.
  24. Master Dalor

    Parallel connection of two BMS for one battery.

    My pleasure, others will wake up, and have better ideas. :D
  25. Master Dalor

    Travel trailer - 24v battery - buck converter question

    If your solar array can give 65Amps you must choose a charge controller witch accepts that. You must also known how much volt is given by your pv. if you mutiply the 65Amp by the volts, you get the power in watts.
  26. Master Dalor

    Travel trailer - 24v battery - buck converter question

    Hello. if you pull 15 amp from each branch, it will not deliver enough. you must stay reasonable, and pull not more than 40 amps in total, you could put an automatic fuse, smaller or equal to 40Amp, if the dc to dc is short circuit protected, (cc cv) no arm can be done. It must connect on the...
  27. Master Dalor

    Parallel connection of two BMS for one battery.

    so as mix of value, maybe you could get only 180A instead of 200A
  28. Master Dalor

    Parallel connection of two BMS for one battery.

    even with different specs it should work. If you set one to top balancing at 4V, and the other at 4.2V, maybe the resistors would burn on the 4.0V before the 4.2 gets a chance to work, the same with low cutoff, depending on the current.
  29. Master Dalor

    Parallel connection of two BMS for one battery.

    Same spec is never identical, but, you can put 2 bms protected batteries in parallel, so it must work like that too.
  30. Master Dalor

    how to modify a car alternator for 48v charging

    Good morning. Maybe it's better to isolate also the 48v alternator from the ground (the engine mount is ground)
  31. Master Dalor

    Parallel connection of two BMS for one battery.

    maybe the current would rush in only one of them, choosing the easyest path.
  32. Master Dalor

    Parallel connection of two BMS for one battery.

    Hello. That is my idea. :D I have 2 bms in backorder to try that, well I thought to do that with just balance boards witch can balance only 1.2 amp per cell, it would double the current, maybe. If your bms is top balancing, it could save you when one battery goes up much faster than the others...
  33. Master Dalor

    Can I add a switch to my charge controller?

    Pps: one last thing, with one eye closed, I don't go more than 24V , with my 6 x 100 W panels, I could get 72V, but on mobile systems, there could be shadows when it's impossible to find the best place to park, with all panels in series only one panel in the shadow means, no more production...
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