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Type: Posts; User: dwh

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  1. Replies
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    I agree with AndrewP - cheapo digital works fine...

    I agree with AndrewP - cheapo digital works fine (and it's what I use myself). If you want to count amp*hours, you'll need a couple of shunts.
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    URL on the truck leads to here: ...

    URL on the truck leads to here:

    http://www.7p.io/
  3. Battery disconnect switch + ANL fuse.

    Battery disconnect switch + ANL fuse.
  4. A "dual sensing" ACR is good because it will tie...

    A "dual sensing" ACR is good because it will tie the batteries whenever the voltage on either side rises (charging is going on). So when the engine is running, the voltage on the engine side rises...
  5. Unless you are doing something to actually drain...

    Unless you are doing something to actually drain your starting battery, it's always full. Even starting the truck only uses maybe 1/5 of an amp hour.




    Again, unless you are doing something...
  6. All solar charge controllers are regulators. They...

    All solar charge controllers are regulators. They connect the solar to the battery until the battery voltage reaches a certain point, then they regulate the voltage by connecting/disconnecting the...
  7. Thread: Solar for my Jeep

    by dwh
    Replies
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    479

    That's a common misconception. Voltage drop when...

    That's a common misconception. Voltage drop when charging isn't much of an issue. It won't prevent the battery from reaching full charge, it just makes it take a bit longer.

    Voltage drop is a...
  8. Vmp is "Voltage (at) Max Power". That is the...

    Vmp is "Voltage (at) Max Power". That is the operating voltage that will get the most efficiency (watts) out of the solar at the moment. It's a moving target which depends on the heat of the cells...
  9. Ground should be the same size as the hot.

    Ground should be the same size as the hot.
  10. Personal preference. If you don't have...

    Personal preference.

    If you don't have anything that drains the engine battery, then you don't need to keep the engine battery topped off. I'd hook the solar to the aux battery to get the most...
  11. Replies
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    Those 6 30a fuses are probably not right. I doubt...

    Those 6 30a fuses are probably not right. I doubt the 12v sockets are rated for that, and the wire to the fuse block looks to be smaller than #10.

    If the wire is #12, you should use 20a (or even...
  12. Thread: Solar for my Jeep

    by dwh
    Replies
    7
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    479

    Looks fine. PV module only has 3 feet of wire...

    Looks fine. PV module only has 3 feet of wire though, so you'll need some more and also a couple of Y connectors to parallel the panels.
  13. I wouldn't. If one has a higher resistance, the...

    I wouldn't. If one has a higher resistance, the other will end up popping.

    Just use ANL fuses. They're cheap and easy, and if you get a fuse holder with a high rating, you can change fuse sizes to...
  14. An MPPT controller does 3 things. A) Operate...

    An MPPT controller does 3 things.

    A) Operate the solar at its Vmp to get the most watts.
    B) Down-convert the incoming higher-voltage to a lower-voltage that is more efficient for battery...
  15. Thread: Amps oh my

    by dwh
    Replies
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    920

    12 amps at 120v - which will be 120a when sucked...

    12 amps at 120v - which will be 120a when sucked out of the battery at 12v by an inverter.

    watts = volts x amps

    120v x 12a = 1440w

    12v x 120a = 1440w
  16. When the winch fires up, the voltage of the...

    When the winch fires up, the voltage of the entire bus will drop. Some power will flow into the bus from the rear batteries, some from the front battery, some from the alternator.

    The rear...
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    Just another 12v lead-acid battery with...

    Just another 12v lead-acid battery with fiberglass fabric between the plates. Pretty much all the same really. No worries.
  18. According to this page: ...

    According to this page:

    http://www.renogy-store.com/30-amp-charge-controller-p/ctrl-pwm30.htm

    "Please Note:This is Positive Ground Controller. If grounding is necessary, it must be completed...
  19. Yes, that is what he said: The blue...

    Yes, that is what he said:






    The blue line is continuity. Put the tester across the terminals of the solenoid - it won't matter if it is engaged or not - it will read continuity:
  20. Replies
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    A regular old multimeter will have a single...

    A regular old multimeter will have a single ground (common) plugin, and two different places to plugin the hot. One is for normal readings, the other is for reading amps. So you have to move the hot...
  21. Thread: Alan?

    by dwh
    Replies
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    499

    True, no consensus has emerged - but there was a...

    True, no consensus has emerged - but there was a vote, and the "ability to delete" won the vote.
  22. That's correct. Continuity runs through the wire...

    That's correct. Continuity runs through the wire from solenoid to Battery A, through Battery A to ground, through ground to Battery B, through Battery B and back to the other side of the solenoid.
    ...
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    As was said, that will show you the open circuit...

    As was said, that will show you the open circuit voltage. No load. The voltage will be lower under load. If there's no load, then there won't be any amps because there is no power flowing (except a...
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    Awesome. I mean...the music. i was so busy...

    Awesome. I mean...the music. i was so busy rockin' out...didn't even really notice the video. But I'm assuming it was pretty good. :D
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    The MPPT will load the array down so that it...

    The MPPT will load the array down so that it operates at whatever the "Vmp of the moment" is. That gets the most watts out of the array. That's the first advantage of an MPPT controller.

    (If you...
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