diy solar

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  • Is welding cable the best for use in a rv trailer?

    I want to use 1/0 cable, and curious if that is the best, or should I source something else. And getting welding cable, just your local welding supply shop? Thanks.
  • My 280 ah cells were almost totally charged?

    I measured 3.32 on almost every cell, paralleled them for a few hours, and after finding my power supply would not go that low, I wired them in series and hit them up at 20 amps for a half hour. 15 volts! Yikes, hooked up a landing light to suck them down for a couple minutes and now sitting...
  • Inverter needed for SMALL dorm fridge?

    Hey all, we are taking delivery of a small trailer that has two refrigerators, one a traditional RV 2 way 6 cubic ft, and the other in the outside kitchen that is a cube maybe 1.5' in every direction. Google says it should draw 50 to 65 watts when cycling, but 3 to 4 times that on startup. From...
  • So with bypass diodes, and a controller that can handle the volts....

    What would the advantage of parallel solar cells be? As long as the controller can handle the volts, is there any reason at all to go parallel? Aren't most panels now equipped with bypass diodes?
  • Help me optimize my rv 280 ah battery

    I brought my trailer out of storage, and fired up it by plugging in and turning battery switch on. After a couple weeks,, I metered the 280 ah eve cells, and find a difference of .120 volts from the highest to lowest. This will be the batteries 3rd season. Should I buy an active balancer? The...
  • Can I make a low temperature charge protect out of a BMP 712 and an SSR?

    I want to use the Daly 200 amp BMS on my four 280ah cells. Since this is going in an RV, I was wondering if I bussed all the charge sources together, (dc to dc charger, solar, converter) and then ran that through an scr controlled by the 712, that should work, right? Finding a high current BMS...
  • Best value 2k 12 volt inverter *must be able to bond neutral/ground*

    Whatdaya got for suggestions. Renogy and GoPower! are in the running, I feel like many of these inverters are all the same with different stickers on them. Must be able to bond ground and neutral, have a remote switch, and a bonus would be able to hard wire. I am not averse to a 3k inverter that...
  • US source for copper braided bus bar?

    Like these, for 280/ 304 ah cells, hopefully with the (silly) 6mm holes? https://www.aliexpress.us/item/3256803329316717.html?gatewayAdapt=glo2usa&_randl_shipto=US
  • Storing for winter, 280 eve cells on trailer tongue.

    How would you store the battery? 1) Leave on trailer with battery switched off? 2) Same, but disconnect BMS? 3) Remove battery and keep indoors to keep an occasional eye on it? I would literally have to partially disassemble it to do this, sorta a pita. It will essentially be below freezing to...
  • BMV 712 Question

    I am installing a battery switch, and using the temp probe. When I turn the battery off, obviously the 712 will remain powered up on my RV. Should I put in a separate small switch to shut down the BMV, to completely disconnect the battery, or is the current drain insufficient to worry about...
  • Using two aims remotehf remote switches via rj9 splitter?

    Anyone know if I cam have two remotes wired to the same (2000 watt true sign) aims inverter? IIRC, they connect via an rj9 cable. Splitters are available for rj9, they would essentially be parallel to each other. Thanks.
  • Question about energy density.

    I noticed these Winston cells: 270 ah weigh 8.9 kg/ cell. https://shop.gwl.eu/Winston-40Ah-200Ah/WB-LYP260AHA-LiFeYPO4-3-2V-260Ah.html The battery cells from dongguan 280 ah, weigh about 5.3 kg...
  • SOC vs voltage on lifepo 280ah 12 volt battery.

    So I set my bmv 712 to read 100% soc at 13.6 volts. (?) With a 4 watt parasitic load, the bmv says slightly more than 2 days. The converter will output 14.6 for four hours, and kicks back to 13.6 after that for float, mounted 8 ft away and using 8 gauge wire. Sounds like a silly question, but...
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