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 > Your search for posts made by 'pianotuna' found 2599 matches.

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  Subject Author Date Posted Forum
RE: hardwire an inverter?

My microwave draws 1591 watts. That represents a load of 160 amps to the battery bank. A puekert calculation suggests that six minutes of use would consume about 40 amp-hours from a bank that is 200 amp-hours. Twin AGM batteries would be able to handle the load but you would have only 30% of the usable power left for the rest of the day.
pianotuna 08/31/15 10:21pm Travel Trailers
RE: battery charging voltage

Hi Mex, I set it at 13.8 volts.
pianotuna 08/31/15 10:06pm Tech Issues
RE: What did you do to your Class C MH today???

Replaced the male plug on my shore power cord with one of the small yellow ones with a handle to pull on.
pianotuna 08/31/15 09:46pm Class C Motorhomes
RE: New Style Batteries

There are few folks successfully using LI batteries in their RV's. You need deep pockets and can not camp below -20 c (-4 f).
pianotuna 08/31/15 08:14pm Truck Campers
RE: Can I Operate Slides With the Engine Off?

Hi, The issue may be voltage drop in the electric motor windings. I'd run the engine myself.
pianotuna 08/31/15 08:09pm Class A Motorhomes
RE: "8 D Battery" Anyone ever use one for house batt?

Hi, Many folks use 8D. I would go AGM. If you have deep pockets and don't camp in weather colder than -20 c (-4 f) consider LI batteries. An 8d has typically about 230 amp-hours at the 20 hour rate.
pianotuna 08/31/15 08:06pm Class A Motorhomes
RE: battery charging voltage

After 4 hours of solar and float charging the four batteries are accepting less than 2 amps.
pianotuna 08/31/15 06:52pm Tech Issues
RE: battery charging voltage

Hi, A bit more information. The telecom batteries had been sitting for a month without being charged. Voltage was 12.83, 12.85, 12.87 and 12.9 I have paired them 12.83 with 12.85, and 12.87 with 12.9 The 12.87/12.9 pair appeared to be accepting 1.5 amps of charge. The old marine walmart batteries -- three were ok and one had a bad cell.
pianotuna 08/31/15 03:29pm Tech Issues
RE: battery charging voltage

Hi Mex, I can not find a vmax but equalize and system cycle voltage is listed as 14.4 to 14.8.
pianotuna 08/31/15 01:02am Tech Issues
RE: battery charging voltage

Hi Mex, Since I have four does that mean 2 amps instead of 0.5 amps? So far as I am aware the Magnum does not have a "timer" so it should stay in absorb until the batteries are ready to float. Yep. This is why Concorde issued succinct instructions for charging then knowing for a fact the battery is 100% charged before reverting to float maintenance. I would suggest trying their formula with your battery manufacturer's recommended VMAX. In your case sir, point five amperes then see if float amperage climbs. An increasing float amperage is a classic tattletale the battery has been forced to float before it is fully charged.
pianotuna 08/30/15 10:02pm Tech Issues
RE: battery charging voltage

One small update. I could not custom set equalization charging to less than 14.6 volts. However, it is unlikely I'll accidentally trigger an equalization charge with the Magnum inverter/charger.
pianotuna 08/30/15 09:34pm Tech Issues
RE: battery charging voltage

Ok, I'm going to custom set absorption at 14.6 and custom set float at 13.8. I'll set equalization at 13.8 just in case it gets triggered in some way. Comments please?
pianotuna 08/30/15 07:43pm Tech Issues
RE: battery charging voltage

Hi BFL13, I got the SG from a web site that sells these instruments of torture.
pianotuna 08/30/15 07:41pm Tech Issues
RE: solar charge controller

How long can you hold your hand on a 60 watt light bulb without it burning you? Power dissipation is necessary or the life of the controller may be short.
pianotuna 08/30/15 04:49pm Tech Issues
RE: What did you do to your Class C MH today???

Finally got the ARP fridge over heating protection device installed. No more agonizing about being perfectly level.
pianotuna 08/30/15 04:08pm Class C Motorhomes
RE: battery charging voltage

Hi Vulcan, I define it as what the Magnum inverter charger does in the custom battery setting. I expect it is the same as bulk, but I'm not entirely sure--and being poor I have to try to treat things the best way possible to make them last. I saw the equalize charging rate and the float--but not absorption. Please define "absorption charging", as you understand it.
pianotuna 08/30/15 04:01pm Tech Issues
RE: battery charging voltage

The jars can be safely charged at c/5. Should I increase voltage until I max out the charger (125 amps possible)? I'll have 556 amp hours of battery bank. Or am I better to just charge at 13.8 volts (maximum float voltage).
pianotuna 08/30/15 05:25am Tech Issues
RE: battery charging voltage

Hi Mr. Wizard, I was hoping you would answer! Thankyou.
pianotuna 08/29/15 10:01pm Tech Issues
RE: battery charging voltage

Hi Almot, I saw the equalize charging rate and the float--but not absorption.
pianotuna 08/29/15 08:38pm Tech Issues
battery charging voltage

Hi, My new to me batteries will be installed tomorrow. I know that recommended float voltage is 13.5 to 13.8 volts. What would be a good voltage for absorb charging? They are used telecom batteries so are a variant of AGM but are not a starved acid configuration. The are Dynasty UPS12-490MR The chemistry is Lead Calcium AGM with a SG of 1.300
pianotuna 08/29/15 08:13pm Tech Issues
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