diy solar

diy solar

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  • Post in thread: Cheapest Easiest way to check used panels?

    There can be volts without amps. Get a dirt cheap amp clamp and just point the panel to the sun and short the panel leads together then amp clamp it to read the amps. Okay edit here: to check volts off MC4's don't poke the wire, touch the leads at the MC4 ends. For amps plug + into - MC4 (not...
  • Post in thread: How to know where to stop when you battery is under a load

    I dare anyone to search for "Coulomb Meter" and make any sense out of what it is and repeat it in normal-person speech. Better to search "Bogart Trimetric battery monitor" or "Expion360 battery monitor" for the universal battery monitors or for Midnite controllers the "Whizbang Jr." All will...
  • Post in thread: Is it supposed to be this HARD??

    It's Quartzsite, Az. You know rock capital of the world, Big Tent Rv Jan 14th+10 days. There's only 2 solar install shops here Discount Solar and Solar Bills however there's 4 huge BLM lands that are open from like Sept 15 to April 15 where people can dry camp for $180.00 all winter and...
  • Post in thread: Firefly Carbon Foam AGMs?

    Yea, Will didn't like them due to lack of distribution. I don't like them due to no user feedback. They seem niche'. Distributor was going to test them out personally and if they turned out not being crap attempt to aquire distribution rights. Problem is they'd cost as much as lithium to start...
  • Post in thread: 1,000 watt vs. 1,500 watt Pure Sine Waive Inverter

    Biggest difference: battery connector arraingment. On the 1000w Tech-On (I have it) they suck! + and - dang near touching each other with no shield like that 1500w GoWISE. The Tech-on is great through, has survived 2 summers 110+ F unshaded on the doghouse of my motorhome and never quit due to...
  • Post in thread: How to know where to stop when you battery is under a load

    What those meters I mention do is not only tell the SOC% (I always ignore that and have a Whizbang Jr- there is no Sr) and voltage but also current amps in and out and amp hours remaining in real time. Real time means they track both charge AND discharge from the batteries. They're the bees...
  • Post in thread: How To Measure Input Watts? Meter Recommendation

    Watts/amps/volts is a trinity calculation. Know 2 of 3 can calculate the 3rd. Just a clue to go on as I always forget which is multiply and which is divide.
  • Post in thread: I know 85MW S5G PWR on sub, but need a start on this LiFePO thing :)

    Just buy a Battleborn 100ah lithium 12v (30-40lbs, forget, light though) or used Valance 40ah and you're set. BTW: lithium is "white gold"- a finite recourse tack that on with supply vs demand = high cost. Eveyone can pile on there poo-poo to this post now.
  • Post in thread: Midnite Solar Inc. KID 30A MPPT for Cabin, Marine, RV etl & more certified

    One nice thing about the 30a Kid that the Classics don't have is a up to 30a programmable load out. Can charge 2 battery banks with a cheap controller between load out and the 2nd. bank during the Kids float if one wants.
  • Post in thread: Need some help for my solar system in my campervan

    Nhh, 12-19v requires power from the adapter also so which is less? adapter or inverter? Have an Asus gaming laptop requires 19.5v input and a Acer NAV50 netbook just at 19V, the powerbrick sizes are for the amps not the volts- I'd take a pure sine inverter over adapter any day simply due to...
  • Post in thread: Is this a good setup for small DIY battery bank?

    Just my thought on your fridge, it's a 3 way which means it's absorption which means it's a power hog on electric so keep it on propane. Also 800w ac for tea is about 80ish amps dc. So rundown: 1. dunno. 2. Basic and Later mean you're learning and heading to v3. I'd just recommend a Battleborn...
  • Post in thread: leaving a charged battery hooked up for long periods

    Your battery will be fine staying connected. To disconnect them means over time (less then a week in some cases) they will slowly self-discharge which will lead to sulfation. As for the voltage drop 13.8 and 13.1 are both surface charges, not deep charges and the fact your battery only hits 13.1...
  • Post in thread: First DIY Electrical Setup

    Yea, quite blurry zoomed in. Is that a MPPT controller/inverter under the panels? If so : Does it have an internal transfer switch? If so: For your AC input (assuming this is a 30amp rig IE only 1 AC leg not 2 like a 50amp rig) you take out your circuit box (don't be plugged in), locate your...
  • Post in thread: leaving a charged battery hooked up for long periods

    Okay gnubie guess it's time for me to tell my story about why I know so much about batteries. lol. Short version, 5 seasons of RV solar installs at a place that refurbishes and sells used batteries (I hate the practice personally). Year 1: I had to test and process all the used batteries while...
  • Post in thread: Clamp Meter < $100?

    Hi there. Loved Wills videos love the forum love this question. So in 2016 I needed a DC amp clamp meter under $200. This is the only one I found on Amazon, seriously this was it and it took hours to find it...
  • Post in thread: How low can the battery get?????

    Right away getting from 13.9v surface charge to 12.1v using a 50 watt load on that battery means your battery is crap. Sorry. Now need the history of that battery to understand why it's crap. How long was it stored, how often discharged to empty how many times was it thrown against a wall in...
  • Post in thread: How low can the battery get?????

    Rchel, I'm sorry, I typed out a lot in that message- things that I learned over years, it's confusing meant to be taken in parts I guess.. Okay new plan and this one is dead simple and will also help tell you the condition of your battery but takes more time. Keep your inverter off, make sure...
  • Post in thread: Beginner here trying to decide on system size

    800 watts, 4 6v lead acid batteries or 2 100-120ah lithium and you're set. Unless your laptop is a 1080 Asus Strix running 16 hours then do the lithium at 800w and you might be fine without some generator time. With the right charger you can trickle charge the vehicle battery (Bluesky 3000i...
  • Post in thread: Xantrex C40 PWM 24v in to 12v out did it work?

    Yep. Heated the controller up a bit and wasn't effient at all but it worked. Ran it for a week that way. Why? Why not it was working. Totally pointless but proves the C40 is near bullet proof as long as it isn't shot at.
  • Post in thread: CIRCUITS BREAKERS/ BOLT ON FUSES (ambiguity)

    200 amp ANL is all you need. 250 amp if you wanna. You split your positive line from battery to inverter and bolt in the ANL case. Easy-peesy and about $20 or so ($50 for the ceramic ones).
  • Post in thread: Zamp solar panels

    Welcome to the internets. Most of the Solar stuff is about cheap crap. Zamp isn't cheap, it's expensive. Is it worth the money? No. (personal review) I install solar on RVs and see many rigs "solar ready" by Zamp as some license deal and love it as Zamp at least uses 8 gauge wire from roof to...
  • Post in thread: CIRCUITS BREAKERS/ BOLT ON FUSES (ambiguity)

    Interesting picture.. Didn't watch whatever video you're referencing so don't know what the thing on the right is but you should have a 2/0 line running from inverter positive, straight to battery with the ANL inbetween. Will talks about a bolt on fuse which one is the ANL - here's a 300amp...
  • Post in thread: Firefly Carbon Foam AGMs?

    Any opinions? Was talking to one of our lithium battery distributors and he skewed the conversation to Carbon Foam AGMs, verified they were Firefly when I asked and I know nothing about them. Edit oops forget it there's a topic in a different subforum which is odd since these are lead acid...
  • Post in thread: CIRCUITS BREAKERS/ BOLT ON FUSES (ambiguity)

    Good question think it just refers to the design but me no know.
  • Post in thread: First DIY Electrical Setup

    Okay downloaded the slightly Engrish maual. What you have is a solar charge controller/inverter hybrid. I've never installed one so good luck with the manual that can be downloaded from the ebay link.
  • Post in thread: Zamp solar panels

    This came back from the dead. We still sell Zamp and let's say in 2018 something came up with Zamps MAP pricing between the same product from two different sources and Zamp said one source had A cells while the other source had B cells. Nothing is indicated on a panel what 'class' the cells are...
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