diy solar

diy solar

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  • Post in thread: Site plan help?

    I’m planning on installing my own Grid Tie solar system and the last thing I need for my application is a Site Plan. So I went to this website https://www.solarelectricsupply.com/solar-contractors/create-a-siteplan looked at their examples and used one to make my own site plan. I’m doing this in...
  • Post in thread: any way to use an older, no-name, crappy 48v charge controller/inverter/mppt unit that cannot charge above 55.5v?

    Should look something like my old set up but instead of the inverter you’ll have the all in one
  • Post in thread: Setting u up 5.1kw new (to me)solar

    That sounds about right as long as you don’t have any shading issues that could make an entire string of panels useless.
  • Post in thread: Setting u up 5.1kw new (to me)solar

    And hopefully you have the right size/gauged large wire to carry that much current if you’re going to combine 2 panels in series by 10 parallel. Or a lot of smaller gauge wire if you’re planning on combining it closer to the charge controller.
  • Post in thread: Slightly punctured pouch cell still good? Let’s see!

    Umm…no? Although, if you’re offering to give my a 6 foot fan if I say yes, then, yes sir, it is!
  • Post in thread: Does this look correct please?

    As long as your battery has enough Amp Hours and the DC appliances don’t pull over 40A, you should be good to go!
  • Post in thread: Alternator for 24 volt starting AND 24v Inverter Lithium bank

    Yes, connect them in parallel with fuses and Vanner volt master 100 amp equalizer in-between. Do this experiment with a DC clamp meter capable of measuring up to 300 amps. 1. Connect the Alternator (270 amps) -> 24v 8D starter battery (measure how many amps are going into the starter battery...
  • Post in thread: Sunpower T5 305W Roof panel 10,000 Pcs

    I bought some and am thinking of making something out of pretreated lumber and “replacement knobs” from Lowes.
  • Post in thread: Any interest in something like this?

    I’m wondering if your device would be just the thing to power a sand battery off of… On a slight tangent, I just spent $80 on a 48v DC to 12v DC converter advertised as 720 watts of output but it only has 360 watts of output before the voltage sags to a voltage too low for my equipment (11v)...
  • Post in thread: The RV Power Trailer

    You just have to be very careful not to exceed the maximum amps that the one battery bank’s BMS will allow.
  • Post in thread: DC solar directly to EV (no AC!)

    Thanks to Tesla and ipandee it’s possible to build one. https://tesla-cdn.thron.com/static/UMDJDV_North_American_DC_Charging_Connector_Datasheet_HTKQS6.pdf?xseo=&response-content-disposition=inline;filename="North-American-DC-Charging-Connector-Datasheet.pdf" You need enough panels to supply...
  • Post in thread: Complete newb always put the cart before the horse.

    What are you planning to power with your micro grid? Or what loads will you be putting on it?
  • Post in thread: Newbie...I just bought 90 Sanyo 190 watt used solar panels. NOW WHAT?

    When you figure out what you want to do with those panels these guys have a nice selection of grid tie/off grid inverters. https://sunelec.com/solar-fire-sale/
  • Post in thread: Already outgrowing my new solar system

    Good luck with that!
  • Post in thread: Alternator for 24 volt starting AND 24v Inverter Lithium bank

    With this battery and a 200 amp fuse, you should be just fine! Redodo 24V 200Ah LiFePO4 Battery with 200A BMS Lithium Battery, Max. 5120Wh Energy Capacity, 4000-15000 Deep Cycles & 10-Year Lifetime, Solar System Back-up Power, RV, Trolling Motor etc. https://a.co/d/3QGmETT
  • Post in thread: Want to convert 24V SLA system to lithium

    With this battery and a 200 amp fuse, you should be just fine, you could just put it in parallel with your SLA batteries without the need for the charge controller between them. Redodo 24V 200Ah LiFePO4 Battery with 200A BMS Lithium Battery, Max. 5120Wh Energy Capacity, 4000-15000 Deep Cycles &...
  • Post in thread: *GONE* LAS VEGAS ONLY: Free LiFePO4 - Helping Will Prowse distribute a couple of batteries

    I’m currently working on one of the batteries @JWLV gave me from @Will Prowse and it’s looking pretty interesting :)
  • Post in thread: Where does it go?

    Or even better this one! It’s an RV application so closer to yours. Web page blog: https://www.google.com/amp/www.beginningfromthismorning.com/dc-power-part-1/amp/ Video:
  • Post in thread: Want to convert 24V SLA system to lithium

    You already have one. You can plug the battery cables into the solar input of your mppt solar charger and your lithium battery on the battery side. Alternator -> AGM/SLA Battery -> Solar mppt -> Lithium battery Check out this video at 15:27
  • Post in thread: Help please!!

    It’s not unheard of to get more than 30ft in a motor home, but I’m sure it can be kept under that.
  • Post in thread: Help please!!

    Okay, so what it comes down to is how efficient do you want your system to be and what is your budget? Every option spoken of above will work and I mean every option including multiple charge controllers. The more efficient you want your system to be, the more work you’ll need to put in (DIY)...
  • Post in thread: Slightly punctured pouch cell still good? Let’s see!

    Okay I’m putting about 200 watts of load on it to see how it reacts to that. Running a couple of fans at their highest setting. 14-15 amps at 12-13 volts. So far it’s bulging a little more lol but it’s staying steady at 13 volts with 30 volts PV at about 1.5 amps. I do believe the other cells...
  • Post in thread: Please check my design.

    I think you’re good to go brewman as long as the fuse block connected to that converter pulls less than 50 amps at 12v which is roughly 25amps @ 24v that fuse of yours shouldn't pop. Oh, also as long as your converter can handle an output of up to 12v at 50 amps and just in case you do pull 50...
  • Post in thread: Alternator for 24 volt starting AND 24v Inverter Lithium bank

    Alternator -> 24v 8D starter -> relay isolator (on/off with engine) —> 24v lithium batteries -> inverters - house loads
  • Post in thread: Want to convert 24V SLA system to lithium

    So do some math, what will get you more power on a 1 hour drive? Solar panels or alternator? You could do both if you get another charge controller.
  • Post in thread: Help please!!

    There should be links to the devices in the description of the videos that I linked. As long as all of your 12v appliances do not exceed 10 amps you only need one converter. Depending on the actual number of appliances, you may need a larger 12v fuse block than the one used in the second video.
  • Post in thread: Want to convert 24V SLA system to lithium

    Or a relay isolator should do the trick too. Alternator -> 24v SLA -> relay isolator (on/off with engine) —> 24v lithium batteries -> inverters - house loads I think using a charger in between the batteries is somewhat safer, but I’ve seen both ways, but no one’s ever compared the two that I...
  • Post in thread: Seeking advice my 24v overkill bms not charging because 1cell has low voltage, how do I charge just the one cell and get it working again ?

    Care to share what battery cells make up your 24v battery? If you have access to the individual cells you should definitely try to charge the one that is low with a bench top power supply. You definitely don’t want to hook up your red ark dcdc 1250D lithium charger without a BMS inbetween unless...
  • Post in thread: Renogy 500A battery monitor not registering alternator current...

    Voltage does not always mean current. If your batteries are at full capacity you will see the voltage increase, but it’s most likely that only half an amp or less is going in. Your shunt will not know whether the solar or the Dc-Dc charger is adding power to your battery bank. If you would like...
  • Post in thread: Can I get 240 volts from the 120 volt Growatt inverter AC output?

    You would need to run it through a transformer. Most people split 240 into 120, but I think it can be run the other way as well…
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