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 > Your search for posts made by 'bdosborn' found 14 matches.

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RE: TT Tire Recommendation

Google "Goodyear Marathon Failure" and you'll find out while I'll never buy another Goodyear product.
bdosborn 08/21/20 06:08pm Travel Trailers
RE: DIY 200Ah LiFePO4 battery < $900

Electric Car Parts is a good place to browse cell options. They aren't in the cheapest around but at least you can call them on the phone if you have a problem. You can build a battery using prismatic cells for about 2/3 the $/amp-hr of a Battleborn, but you don't get the warranty. I built my battery using CALB cells and I'm very happy with it, but if it breaks its on me. Bruce
bdosborn 08/03/20 04:02pm Tech Issues
RE: Changing oil & can only fit in half a quart :S - QG 4000

FWIW, when I filled the oil on my 5500 Onan, I had to do it slowly to allow the air to "burp" out. When I'm filled with beer I need to do it slowly to allow the air to "burp" out.
bdosborn 06/17/20 06:14pm Tech Issues
RE: Lithium Battery Question

How do they know what to set the low voltage shut off at when it is not balanced at that end? I assume it is top-balanced. They must be confident the cells are enough alike that one won't go too low. That was another thing that I had to wrap my head around. I was under the impression that the cell voltages would vary widely but I've found that the difference between the highest and the lowest cells in my battery has always been at 0.008V or less. So the cells would have to be out of balance by a lot more than that before the voltage shut off would be inaccurate. I'm not running big loads and I have 6 amp cell balancers, which I'm assuming is the reason my cells have been staying so close in voltage. Bruce
bdosborn 05/05/20 05:44pm Tech Issues
RE: Lithium Confusion

They have bigger protectors, up to 220A. Victron Linky My battery has a 2C discharge rate. I have them in a 2p4s arrangement so I have 360A of discharge current available. One of the nicest things about LiFePo4 batteries is there's no Puekert effect, the voltage stays fairly constant, even with large loads. My inverter is only 300W. I'm not a full timer so I don't run any large inverter loads. I want the capacity for the electric fridge. Another often overlooked feature of LiFePO4 is their low internal resistance, which means they are 99% efficient when charging versus ~85% for lead acid. Bruce
bdosborn 04/21/20 03:50pm Tech Issues
RE: Lithium Confusion

P.S. here's my favorite web page on making a LiFePO4 battery using prismatic cells. Assembling a Lithium Iron Phosphate Marine House Bank Bruce
bdosborn 04/21/20 09:46am Tech Issues
RE: Lithium Confusion

So ? you can use the Iota Li dongle with a build your own bank but not with a drop-in? because you have another way to prevent over-voltage or you have your own settings? I don't have personal experience but my guess is the Battleborn battery BMS will disconnect at 14.4V when charging. It will connect again when battery voltage falls below that. The Iota probably isn't the best charger for a Battleborn but it's great for prismatic cells. I already had an Iota DLS-45 so buying the dongle was a great option went I upgraded to LiFePo4. I don't have a Victron monitor (Trimetric here) but how does it shut anything off? The Victron BMV-712 Battery Monitor has a programmable relay that will open and close at certain voltage levels. Works with the Victron Battery Protector. Just one of the reasons I went away from Trimetric. So your BMS is not the same as what you get in a drop-in so you can get away with using the Iota dongle? Yup Itinerant1 has something else in his mix ISTR "EMS" to go with his BMS that he uses for his settings? What do you have? I just use a BMS Do you lose all 12v in the RV if the protection method shuts down what? Yours shuts down the charger but not the batts? Yup, the charger disconnects separately from the load. I use two Victron battery protectors, one for the charger and one for the load. Bruce
bdosborn 04/21/20 09:38am Tech Issues
RE: Lithium Confusion

It stays closer to 14.6V, here's a closeup of the end charge. It has gone up to 14.7 once when the cells were taking the first charge. I think it takes a few charge/discharge cycles before the cells settle in to whatever balance they're going to be at as it hasn't happened since. Charger was disconnected by the Victron Battery monitor, battery voltage settled down to 13.5V and the charger was reconnected. The charger was in maintenance mode so no further charging occurred when it connected. http://tnttt.com/gallery/image.php?album_id=2320&image_id=161342&view=no_count Some things I had to wrap my head around: - Remember that 4.2V used to be the recommended charge voltage for LiFePo4 so I'm not concerned it I go over 3.65V by a few millivolts. It will only be up there for a few minutes. - Look at the charge being delivered at 14.6V, it's only a couple of amps. Bruce
bdosborn 04/21/20 07:07am Tech Issues
RE: Lithium Confusion

I have an Iota charger with an LiFePO4 charge dongle. Here's the charging profile for CALB 180 batteries, from 80% discharge back to fully charged. Note that the battery was 100% charged after 3.5 hours. http://www.tnttt.com/gallery/image.php?album_id=2320&image_id=160738&view=no_count The charger stays at 45a and targets ~13.5V. When the battery voltage rises up to 14.7V or so, meaning the cells are charged, it tapers the amps down to zero. Then it floats the battery at 13.5V and, wont charge it again for two weeks. After two weeks it wakes up and charges it back up to 14.7V. Repeat PRN. Near as I can tell, this is the recommended charge profile for LiFePO4 prismatic cells. Bruce
bdosborn 04/20/20 06:13pm Tech Issues
RE: Lithium 12 volt battery Is there a clear leader?

You didn't read what the OP was asking for. Ahhhhh... Ah cheap as in "Honey, forget Taco Bell's 99 cent special. Tonight we dine at Costco's food court". AMAZON? Was mulling something around 10 lbs 5 Kg that could be controlled drained to 0% and used with a BiPAP away from home in an outage. A nifty critter with remote 10 watt LED lamp and USB charger for an eBook.
bdosborn 02/20/20 04:59pm Tech Issues
RE: Lithium 12 volt battery Is there a clear leader?

How about something like this: Jackery Portable Power Station Here's annoying Will doing a review on different models. Annoying Will Bruce
bdosborn 02/19/20 07:24pm Tech Issues
RE: Best charge controllers..

I just replaced my Morningstar MPPT with a Victron MPPT. Why? Setup is super simple with the Bluetooth app. I have the PV controller networked with the battery monitor through a Raspberry Pi so now I get email alerts if the battery charger goes down. I'm a meter freak and I really like the phone app and HTTP interface. It seems like Morningstar has slacked off on the integration side of their small controllers, Victron has really pulled ahead there. However, time will tell in regards to reliability; my Morningstar worked for 10 years without a hitch and that's something. Bruce
bdosborn 02/07/20 08:01pm Tech Issues
RE: Garmin GPS

I just updated to a Garmin DriveSmart 61 and was amazed at how much better it is than Google maps. The interface is more intuitive, the directions given are better - "turn left at the next light", it tells you which lane to be in and there's often a picture of what the next turn looks like. Google maps works, but it's not even close to how slick and useful the Garmin is.
bdosborn 12/01/19 08:49pm Technology Corner
RE: Charging electric car

“one killowatt gets you about 6 ish kilometers in most EV's. ” Unit confusion in this topic! The kilowatt is not a unit of energy. It is a unit of power - how fast energy is consumed. Analogous to a gasoline car’s gallons per hour. The unit of electric energy is the kilowatt hour. Analogous to gas car’s gallon of gas. Driving an electric car a kilometre requires some amount of energy. How many kilowatt hours is it? How much does a kilowatt hour (KWH) cost? This is indicated on any electricity bill. It may be ten cents plus another ten cents delivery charge. Why not just convert ecar units to gas car units? Much easier to relate to for most people: 746 watts = 1 hp 1 kw-hr = 0.03 gallons of gas Bruce
bdosborn 11/30/19 10:35am Tech Issues
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