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azrving's avatar
azrving
Explorer
Apr 25, 2015

Solar plan

i read all of the posts of the solar installs and try to read everything that comes through. I didn't buy a trimetric or anything else to measure my use but some suggest matching it to the battery amp hours. I have 4 gc 2 Sams club batteries so about 400 ah. One online calculator said I was around 55 amp hours a day so it would seem that I could go 4 days but that's not true. It's more like 2 days and obviously depends on several factors.

Factors like how cold is it, how much water I pump from a 6 gallon jug on the ground and through my winterizing valve into the fresh tank, number of hours of 40 inch led tv which draws 6.7 amps. I have looked at the other heating options and could only really go with the cat platinum vented but have nowhere to mount it. I like my furnace as it does a great job, it just sucks 5 amps.

I understand how to cut down on energy use in several areas but I dont want to conserve, I dont want a wool hat in bed, I dont want extra bedding, I want to be just as comfortable in the RV as I am at home. The main reason I leave the north is to escape the cold, not to go camping or compromise on comfort. Not sounding snobbish just saying that everyone does it differently. I have wondered why I see people walking around inside big rigs with a flashlight only????

So far I have done it with 4 cheap batteries, an PD 4655, a Quick Charge brand battery charger 50 amp and a mega watt 30A 15.5 v power supply. I have had extremely short generator run times. probably because of hitting them with 105 amps and doing 15 volt top charges.

So right now I made it through the winter and I'm in the process of watching the batteries. I'm not worried about them but I am amazed at what they have done for me. I figure they should last 4 years for $350.00 so if they only last a year and a half that's fine. That's a $225 penalty for what I put them through. No big deal or I wouldn't have spent $3,000 on diesel fuel.

One thing you guys had mentioned is the generator noise out in the desert. I have never been out there and always pretty much woods camped so far. My Honda is in an insulated cabinet in back of my truck and is very quiet but when I visited west Texas I found out what you mean about the noise. It's a whole different game out in the wide open areas.

So it's time for solar. I dont plan on inverting to the heavy stuff. I always start any measurements with one question and that is do you EVER want to run the AC? I do, so I'm going to have the Honda 3000 with me. I will just push the remote start button for the Honda to run the the micro, hair dryer or toaster.

I'm thinking about 3 160 watt panels or 4 120 watt, a Morningstar PWM 45 Tristar. I would like to do this one time and do it right. I think I would be around $1,500 or so. On top of that price I may go to Trojan's or Crowns if my turds are shaky after running them this summer.

What am I messing up on? I like the idea of connecting straight to the panel box instead of those mc type connectors?? I have a crimp tool for all the connections. I also have a bit of 6 gauge on hand and will buy whatever is needed. I think I can make a combiner box and go thought the frig vent with Home D components. The controller will be within a few feet of the batteries. I have blue seas switches that let me separate banks for equalizing and charge either or both banks from either charger.

I dont want to have to go up there to tilt but I will make them tilt-able just in case.








Less chance of shadows?


If I use 4 panels they would probably be more like 22 inches wide I believe.


Thanks for your help and all the excellent reading you have provided. I made it through the winter because of you guys.
  • I installed 3x250W, MPPT60, remote, etc last Dec for $1447. No panel shipping as I picked them up from Solar Blvd. You can install them to avoid rig shadows as I did. Flat mounted and i got 600W output (45A) on 3/3/15.

    I could add a 4th going series/parallel. The MPPT60 will derate to 60A should that ever be reached with 4 panels. But if so it would only be around noon time. For me no tilting and no rig shadows.

    MC4 connectors make removing a panel or bypassing a panel easy should that ever be necessary. I carry several spare connectors and wire. 10ga UV wires straight to the controller. 42' + pigtails with almost no loss due to the high voltage.

    You have lots of panel room for the 24V panels if you think outside the box. I had a lot less room.

    My installation.
  • I called solar blvd.

    Shipping for 3 of the 24 v panels would be $250.00 They also said that if part of the panel was shaded I would lose part of the capacity, not all. He was not able to explain much about the diodes.

    Senario 1:
    Go to the Amerisolar 250 watt 24 volt from solarblvd for $170 ea ($510) plus $250 shipping = $760 or $1.01 per watt.

    MS Tristar 60 mppt $475.00 at Solarhome

    Aluminum home brew brackets non tilt, cable, disconnect, fuses, switch, $200.00

    $1,435 for 750 watt $1.91 finished cost. (my labor)




    Scenario 2: 520 watts
    4 solarcynergy 130 for $492 plus $135 shipping = $627
    MS Tristar pwm 45 $150
    mounts, tilting, combiner box, switches, fuses, $300 maybe less or more?
    $1,077 or $2.07 per watt


    Scenario 3: 400 watts
    Ebay 4 100 watt panels with shipping $500
    Cheap controller $30.00 or MS Tristar 45 pwm $150
    Misc stuff $300
    $830 w/cheap controller or $2.07 per watt. With MS pwm 45 tristar $950 or $2.37 per watt

    Scenario 2 and 3 will end up with me on the roof tilting because like many guys I want the pedal to the metal in some ways.

    If I fall off the roof, wife finds younger guy who uses the money to have a 750 watt system installed and they ride off.
    So if we average the difference out between scenarios it's about $500.00 If we apply "Marriage math", the difference becomes $250 for me and $250 for her and "I" dont have to climb and tilt.

    A guy I worked with always called me the "Cheap B - - - - - d" but I need to think seriously about scenario number 1.

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