Tag Archives: 24/12VDC house battery system (MC-9 NT)

2015/09/08 (T) Polyurethane

I was awakened at 6:30 AM by heavy rain.  I was not sleeping comfortably and had to get up anyway, so I put on my lightweight robe and slippers and took my iPad to the living room.  Naturally the cats wanted to be fed so I took care of that and then settled in to put the finishing touches on yesterday’s blog post.  The rain lasted for about 20 minutes.  I e-mailed the post to myself at 7:15.  Linda got up at 7:30 AM so I made coffee but we deferred breakfast until later.

I was thinking about the house battery voltage issues Butch was having and the role of the Vanner battery equalizer in his (and our) house battery system.  I did another Google search on “battery equalizer …”, and selected “batter equalizer circuit” from the list.  One of the listings was for the original patent application by James D. Sullivan as assigned to Vanner, Inc. ( http://www.google.com/patents/US4479083 ).  (I found it interesting that Google has a special directory for patents.)  As I expected, it is a DC-to-DC converter and in its most common configuration it is designed to take charge from the upper portion of a series battery pack and supply it to the lower part of such a pack or to any loads connected across just the lower bank.

One of its features is that it looks at the voltage across the entire battery pack and uses a voltage divider network (two resistors in series) to generate a reference voltage that is compared to the voltage across the lower bank.  Differences as small as 0.01 volts result in the transfer of charge from the upper to the lower bank when the lower bank has the lower voltage.  As implemented for use with buses and other vehicles that have 24/12 dual voltage DC electrical systems the divider network consists of two equal resistors and the reference voltage is 1/2 the overall battery pack voltage.  The design can “balance” other configurations, in which the “upper” and “lower” banks do not have the same voltage, by changing the divider resistors to have the correct ratio.  I will call Butch again this evening to report what I found and see how things stand with them in general.

When we had consumed a sufficient amount of coffee to be alert enough to work intelligently and safely we went to the garage to finish assembling the left plenum/support box for the built-in sofa.  I forced mating pieces into alignment while Linda drove in the screws.  These parts dry fit perfectly so this should not have been a problem.  I blame the slight misalignment on the corner clamps that I used.  I was reminded, once again, that cheap tools are almost never a bargain.

We had breakfast at 8:30 AM; homemade granola with leftover mixed berries.  We also spilt a banana that was getting past ripe.  As we were finishing our meal I got a call from Steven Weber at Martin Spring with another question on the Webasto system in the Prevost Bus Conversion he is servicing.  He had isolated a cracked fuel pipe and needed to order a replacement.  I suggested Sure Marine Service but also mentioned Lloyd DeGerald and Darin Hathaway.

Linda needed to spend some time at her desk preparing for a 1 PM meeting with the I.T. department at the University of Michigan Ann Arbor so I took a shower and got dressed to work.  I gathered up the laundry, started a load, and then spent some time in the garage sanding pieces of the built-in sofa while Linda showered and got dressed for her meeting.  She planned to leave at 11:45 AM.  I left at 11:30 and went to Lowe’s to buy tack cloth.

Tack cloth is like sticky cheesecloth and is probably called that because it is “tacky” to the touch.  It is used to remove sawdust, drywall dust, and other little tiny particles from surfaces such as sanded wood just prior to the application of finishes.  While I was there I looked at inline water separators and inline oilers for use with air compressors supplying air to pneumatic tools.  I also looked at copper fittings to see if they had 90 degree elbows that I could use to modify the Aqua-Hot coolant lines that feed the two front fan-coil hear-exchangers.

Linda left before I got home.  I moved the laundry to the dryer and went back to the garage to work.  I was contemplating what I wanted to do next when Keith pulled up in his truck and trailer.  I chose to skip having the lawn mowed this week which will help Keith get the rest of his clients taken care of in his shortened 4-day workweek.  The grass has grown since last Monday but not that much and is still short and brown in places.  With rain in the forecast today, tomorrow, and Thursday giving it another week should be good for it.  I showed him the floor in the bus before he left.

I returned to the bus project and realized that I needed to stain the underside of the built-in sofa shelf as part of it might be visible through the notch in the vertical front panel at the floor.  As long as I was staining that I also stained the tops of the plenum/support boxes so they would blend with the two stationary pieces at either end of the seat.

With the staining done I came inside to make a few phone calls.  The first one was to Josh Leach at Coach Supply Direct to check on the details of the Corian countertop for the custom desk.  Josh said the Corian normally comes bonded to plywood which protects it from cracking in shipment.  I want to go ahead and cut the 3/4″ plywood top that will join the two pedestals together.  I also wanted to know if his Corian vendor could come out on the afternoon of the 14th to measure and possibly install the countertop by the end of the week.  His vendor turns out to be an Amish craftsman who does not “come out and measure” or “come back and install.”  Josh said he would check with the vendor to see if he would use my plywood base and also see if he had the Sandstone product in stock.

My next call was to Pat Lintner to check on dinner plans for the upcoming GLCC Surplus and Salvage rally.  I need to coordinate with Crimp Supply to have them provide catalogs for the attendees and perhaps speak to the group before dinner.  I got his answering machine and left a message.

My third call was to Jim Miteff (N8KUE) returning his call/message from earlier.  We had a long chat about RVing and Prevost bus conversions.  It’s a big topic and I sometimes forget that I have spent the last 10 years learning about it.  When I think back to the beginning of this adventure, however, I recall how exciting yet overwhelming it was initially.  I see Jim in the same place, but he is a very quick study and professional researcher so he will get past the overwhelming part fairly quickly.

While I was talking to Jim I heard a loud bang and then another one.  They sounded like it had come from within the house.  After the second one I got up to investigate.  As I peeked out the front door a Consumer’s Energy truck was backing out of the driveway.  I flagged the driver down and asked what was up.  He said they had detected a leak and that he had just fixed it.  I presumed it was at our meter but he wasn’t any more specific than that.  I thought it was odd that he did not knock on the door first to let me know he was on site, but I guess they have the right to service their infrastructure.  I have smelled gas on that side of the house occasionally ever since they installed it but dismissed it as a “purge valve” doing its thing.  We had the same issue at the old house and they kept telling me it was a “vent” mechanism on the meter.  I never belief that, but whatever.

I wrapped up my call with Jim, put in another load of laundry, and returned to the garage to apply polyurethane to as much of the built-in sofa pieces as I could.  Each piece has to be done in two steps and requires two coats, so that’s four applications that will have to spread out over a couple of days.

There wasn’t much else I could do, and I did not feel like working at my desk, so I hung up the dry laundry and then worked on my iPad in the living room.  Linda had made an appointment with Renee to have her hair cut at 4:30 PM.  She stopped at Meijer’s on the way home and finally arrived at 5:45 PM.  I went back to the garage at 6 PM and applied another coat of polyurethane.

Linda bought an Amy’s Roasted Vegetable pizza for dinner and made a nice salad to go with it.  I had some more of the Leelanau Cellars Apricot wine and we had the last two vegan cupcakes for dessert.  I tried calling Butch twice but his phone was either off or out of range.  I called Pat Lintner again and this time he was home.  Saturday dinner will be at a restaurant so that will not be a good time for Crimp Supply to talk to the rally attendees and pass out catalogs.  I will call them tomorrow and see what I can arrange.

I headed back to the garage yet again, applied polyurethane to all the surfaces that had not yet been coated, put the brush in the soapy water, sealed up the can, and closed up the garage.  I think I have just enough polyurethane left to put one more coat on the top surface of the shelf.  I plan to do that in the morning before I start anything else.

On the drive home Linda heard a weather forecast that thunderstorms were headed our way this evening with up to 1″ of rain, strong wind, and possibly small hail.  Linda headed off to bed at 8 PM to watch NCIS and I caught the last half of the show.  I turned the channel to Create on Detroit PBS and watched A Chef’s Life, a series about a wife and husband who run the Chef & The Farmer restaurant in eastern North Carolina, and then turned the TV off.

I checked the weather with my iPad and it appeared that system had fallen apart although there was still a reduced chance of scattered thunderstorms at 11 PM and again from 2 to 4 AM.  I turned the light out at 10:30 PM.

 

2015/05/27 (W) The Root of all Things

Yesterday I used up the last of the coffee beans that Jeff at Teeko’s shipped to us in Quartzsite in late February so this morning I transferred the beans we had roasted last week into our airtight containers and started using them.  Grinding our own custom roasted coffee beans is how my mornings usually start and is just another small thing I like about being retired.

We rarely made coffee at home in the morning when we were employed outside the house.  It took too much time and made a mess that had to be cleaned up later, including the travel mug that we had to remember to rinse out at work and then bring home.  Besides, Linda got free unlimited coffee and tea at the office and I found it easier to stop at Panera and get a large coffee to go; half hazelnut and half decaf.  It was part of my morning routine that I found comforting and the cup was disposable when I was done.

I had a follow-up appointment and evaluation at the endodontist today, so I did not work in the bus this morning other than to take a few pictures of the old dinette corner, where I removed the mirrors yesterday, and the area under the bed, which I also worked on yesterday.

After morning coffee and breakfast I went to my office to work at my computer.  I off-loaded the pictures I just took, selected a few, processed them, and copied them to the folder for this blog.  I then downloaded and installed Adobe FlashPlayer in order to view the Gilbreath Upholstery Service website.  The download also installed a McAfee virus checker that I did not ask for or want and I don’t recall being given an option to opt-out.  I really dislike it when programs do things like that.  In fact, I think it should be illegal and companies who do it should be subject to heavy fines.  I tried to download the PDF catalog but Adobe Reader said it had an unrecoverable error.  Arrrgh!  I e-mailed them to request one that worked.  We will see if that results in anything.

I was responding to a few e-mails when Butch called.  He was trying to figure out the best way to connect up the eight L-16 6 VDC batteries he bought in Quartzsite to make a 24 VDC battery bank with a 12 VDC center tap.  Working only from verbal descriptions we finally ended up with the same diagram of a series-parallel interconnection scheme with equal electrical path lengths through all of the batteries.  The difference between series-parallel and parallel-series is not important when the batteries are operating correctly but each connection scheme is vulnerable to a different battery failure mode.  I happen to prefer the series-parallel scheme as I think it results in better battery charging, but that’s an often debated subject.  The equal path lengths through the batteries, however, is something that is worth accomplishing if at all possible.

By the time we were done talking I needed to leave for my endodontist appointment.  Dr. McWatters said the root canal they did on my upper right rear (tooth #4) last September looked good.  They tested the upper rear teeth on my left side but did not find any indication of a problem.  That would normally be good news, except that I had an intermittent problem in that area all winter so I know something is wrong and will eventually require attention, most likely when it is least convenient for me (middle of the night on a weekend).  But for now there is nothing more to do.

hen I got home I had a few pretzels and hummus and some red grapes and then got back to work at my desk.  I copied my blog post drafts for the 17th through the 26th from e-mails to Word and started editing them.  I took a break to have some tea and write while Linda cooked dinner.  She grilled two veggie burgers along with the rest of the asparagus we bought on Sunday and served the potato salad she made earlier in the day.  Most of the asparagus was mushy except for the tips which I attributed to the plants not the cook.  These were very large purple stalks, not the usual somewhat thinner green ones so maybe that had something to do with it.

After dinner I returned to my desk and finished editing all of my blog posts for May 10 through 26.  Somewhere in the middle of that work Phil Jarrell returned my phone call from yesterday.  We agreed that I will call him back after the GLAMARAMA Rally and he will bring his laser level and we will shoot some elevations.  With a little luck and a bit of perseverance we may get a gravel driveway connecting the 3rd (westernmost) culvert to our concrete driveway with a level spot for one or two guest RVs to boondock. We will also get a dozen tree stumps removed, get a French drain installed to remove water from the western end of the property, and get a hole dug for a ham radio tower foundation.  That last bit of digging will also require a rebar cage, hinged tower base, and coordination with a supplier that can pump concrete immediately after the hole is dug.

When I was done editing my blog posts I logged into our WordPress site, deleted 181 spam comments, and installed an update for our Fast Secure Contact Form plugin.  I started creating the post for May 10 but half way through the Chrome browser became non-responsive indicating that it might be out of memory.  That seemed unlikely, but I closed all of the program’s I had open, shut down my computer, and restarted it.  When I logged back in nothing was responding so I sat and waited until I was eventually able to do things.  The first thing I did was uninstall the McAfee Security Scan app that got installed along with the Adobe FlashPlayer earlier today.  I then proceeded to download three updates for Windows and MS Office, or tried to.

The three updates were only 27 MB total, but after 35 minutes they were only 53% done.  My guess was that the data rate on our AT&T “High Speed Internet” (DSL) connection had slowed to a barely usable trickle, perhaps because of all the rain we had the last few days, but whatever the cause it was almost midnight so I left it to finish at its own pace and went to bed.  I worked on this post and played a few games by which time it 12:45 AM so I got up, put on my robe, and went back to my office.  The download had finished and two of the three updates had installed.  The third one reported an error but Windows Update needed the computer to be restarted to finish the installation so that’s what I did.

Windows updates normally install during shutdown and finish installing on startup and that is precisely what happened this time as well.  I let the system startup completely (until the hard drive light was not on) and then downloaded, installed, and ran the latest version of CCleaner.  It downloaded much faster so maybe it was the Microsoft update server that was slow, or perhaps the McAfee app was causing the problem.

We had rain yesterday and more rain today, including some thunder.  The lights flickered a few times both days but the generator never came on.  If out Internet performance is still sluggish in the morning I will reset the AT&T gateway and see if that helps.  I also noticed that our home refrigerator was suddenly showing 45 degrees F instead of 40.  Linda had loaded it up with food yesterday, and added the potato salad today, but the temperature should not have changed by that much and should have returned to the 40 degree set point within a few hours.  Even adjusting the thermostat down did not rectify the problem over the course of the day so perhaps something else has changed, such as a blocked vent.  I will have to check for that tomorrow.  Hopefully the power blips did not blip some control circuit.  I think I will pull the fridge away from the wall and cycle the power.  We can vacuum off the back while it is out.  If it still won’t hold the temperature we want Linda might get a new refrigerator for the house sooner than expected, although a call to AAA Appliance Service Network in Howell might a more prudent first response.