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  1. #21
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    VRLA batteries are not that complicated but first thing is to get a data sheet and read it.

    Most lead acid batteries are rated for expected 1000 charge and discharge cycles.

    Full discharge is 1.7 volts per cell.

    You can improve by using 1.8.

    1.75 is 10.5 volts on a 12 volt unit.

    Only discharging to 12 or 11.5 requires more batteries that may last longer but at the end your cost is same as the 2 times the battery cost may have lasted 1.5 times longer.

    Pay attention to the load ratings.

    A 100 Amp hour battery is rated at 8 hour load.

    Some cheat and will state a larger output but 20 hour rate.

    Calculate your estimated run current then look up on sheet.

    If it draws 10 amps at 120 it will be 120 plus inverter overhead at 12.

    If using inverter look for unit that operates on higher input voltage.

    Many available with 48 volt input.

    Reduces input current and easier to build.

    Whatever battery you choose to use, download the data sheet and understand how the battery works before you buy one.

    Sent from my SM-G781V using Tapatalk

  2. #22
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    Before we go any further - what parts do you already have on hand?

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  4. #23
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    Do we understand the GRAVITY of this project? A WHOLE solar system?! Solar system design tips I'll see myself out.

    Sent by telegraph using - .- .--. .- - .- .-.. -.-

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  6. #24
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    Quote Originally Posted by thermite View Post
    Given that is exactly what Edison Cells have BEEN doing (think railways) for 100-odd years?

    You were making a funny, yah?
    ........................
    pretty much. If there is any service that is harder on a battery than the railroad car battery (back when they had lots of those), I don't know what it might be.

    Neglect, vibration, impacts, more neglect, cold weather, hot weather, lots more neglect, "what's this thing with the wires?", busted generator wheelset drive belts, more neglect........

  7. #25
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    Quote Originally Posted by thermite View Post
    *yawn* Gotten so lazy in me dotage I buy 40/45/50:1 for saws and stuff already premixed. Easier to avoid debilitating Ethanol that way.

    "Average" tree, not mini-sapling, is closer to thirty inch here, though so ... Husgvarna or Stihl country, not batteries.

    Three hundred bucks? ... Or "more?" And you haul that s**t around? And have to "charge" it? To trim freakin' shrubs?

    "Uhh, yeah, whatever you say"
    I haul it around on my 50 year old electric tractor

    and never worry about ethanol or mix ratios or will it start or anything


    When I need a 30 inch tree felled I call the tree guy, but the average standing dead I can handle myself


    my comment was on topic, yours, as usual, was BS, and missing the point, and I doubt you can lift your empty hands above your head, no less wield a chainsaw

  8. #26
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    Quote Originally Posted by 52 Ford View Post
    Do we understand the GRAVITY of this project? A WHOLE solar system?! Solar system design tips I'll see myself out.

    Sent by telegraph using - .- .--. .- - .- .-.. -.-
    You may have to do it in the dark if you were depending on this project to light the way..

    The guy to see is the Son of Gundar.

    Seems to have invented free electricity at zero maintenance or investment?

    Or mebbe just has a gen set run off burning green wood for steam?

    That'll keep his cranky ass out of the better pubs and brothels.

    Win-Win izzat?


  9. #27
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    Quote Originally Posted by thermite View Post
    a gen set run off burning wood?
    https://youtu.be/oWeRWGQK5gA

    https://youtu.be/FK2qK-NCQH8

    Sent by telegraph using - .- .--. .- - .- .-.. -.-

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    Ive got an underwater chainsaw.....doesnt work too well cause the firewood wont burn......anyhoo,was thinking about hydraulic chainsaws....then it struck me.....why not run the air chainsaw on steam.....plenty of steel pipe/old compressor tanks/car LP gas tanks etc around......steam boiler has got to be childsplay at about 50psi......lotsa crap on telly about 'netzero'.....a steam chainsaw is net zero,for sure.

  11. #29
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    Quote Originally Posted by john.k View Post
    Ive got an underwater chainsaw.....doesnt work too well cause the firewood wont burn......anyhoo,was thinking about hydraulic chainsaws....then it struck me.....why not run the air chainsaw on steam.....plenty of steel pipe/old compressor tanks/car LP gas tanks etc around......steam boiler has got to be childsplay at about 50psi......lotsa crap on telly about 'netzero'.....a steam chainsaw is net zero,for sure.
    If... you have to CARRY all this s**te as well as FEED it?

    May I suggest an ignorant muscle-powered bowsaw can keep your wood cookstove, the smokehouse, and home heating hearth fires of a winter fed with a great deal less effort?

    Watcha doo is burn smaller stuff... No need even to split it.

    Mind.. wasn't exactly a "handicap" we had 5,000 cider-apple trees, 1,000 Peach, and 1,000 Cherry trees in the orchard to keep in good order, regardless.

    You'd have to ken Appalachia? Can't PLOW what ain't flat..

    Locust for fencing, Oak, Hickory.. Black Walnut...

    Damned fine Solar Collectors, the lot of 'em.


  12. #30
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    Quote Originally Posted by Just a Sparky View Post
    Before we go any further - what parts do you already have on hand?
    Apparently, a blower, a generator and a few planets.

    Cole, As regards modern inverter parasitic/internal load, it's almost negligible. Outback power VXR series (4800-6000VA) for example, uses 34 watts at full power, in search mode (on, waiting for a load) 9W and 3W in off mode (will do everything but invert).

    With all due respect, consider just sticking with your Honda Inverter generator as a power source. It's portable and will keep up with the blower, whenever it happens. Not true of any solar powered system that meets code.

    Good luck. If you want the advice of someone who's designed a few offgrid systems, give a shout through the control panel.

  13. #31
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    Quote Originally Posted by Just a Sparky View Post
    Before we go any further - what parts do you already have on hand?
    It's all at the lake, but I'll be there tomorrow and will get some info.

    Funny enough, Im going down there to work the surface end of a hydraulic underwater chain saw.

    Programmed via Mazatrol

  14. #32
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    Hey Cole-

    Rather than run an electric blower from solar and battery, what you might consider, is scrapping the battery plan, and use a large-volume compressed air tank, and either use your solar array to drive an electric motor on a compressor (pumps whenever the sun shines), or a windcompressor... a compressor pump with a set of flights always facing into the wind. You don't need much pressure... the sponsons need only enough pressure to displace water, which will be about 4psi.

    I set up my buddy's homemade (55-gal plastic barrels) lift from a 20-gallon air tank charged to 60psi... and it was MORE than enough. [email protected] = [email protected], which is 300*8= 2400lbs of lift.

  15. #33
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    Quote Originally Posted by Cole2534 View Post
    I'm doing design checks on a small, intermittent use solar system.
    I thought for a second you were playing God


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