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 > Your search for posts made by 'FWC' found 39 matches.

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  Subject Author Date Posted Forum
RE: What's a good battery level monitor?

This only works if you sit at float voltage for long periods of time. The current into the battery at float is typically only 1-2% of capacity, so if the monitor is off by 10%, it would take 5-10 hours at float to catchup. This may work for you, but not for folks that don't plug in every night, like the OP.
FWC 11/18/20 03:40pm Tech Issues
RE: What's a good battery level monitor?

It is not just theory. For many of us who don't plug in, you can get several partial charge cycles in a row (several days of non optimal solar for example) and as a result your SOC can be significantly off. Without plug ins, we also generally don't sit at float for hours upon hours to get your monitor back to 100%. Yes you can make it work without these conveniences, but you have to remember when the last time you were on float for multiple hours, or try and check the battery voltage when you know things are at rest. My point was that the good battery monitors deal with this, and you can be fairly sure when you glance at the display that the number is pretty close to reality. Cheaper monitors are a compromise. I use lithium batteries, so the voltage doesn't tell me much about the SOC. However I have a good battery monitor that is correctly programmed for my batteries, and I can trust it. Regarding the drifts and possible inaccuracies due to a variety of behavioristics of charging and/or the batteries themselves.... I can see how IN THEORY you could have an issue if every time you charged your batteries you immediately STOPPED charging once your monitor said you are at 100%. If you were in fact not 100% full (...let's say the true SOC is only 95% even though your monitor incorrectly says 100%) and then you used your battery down to 50% as stated on your monitor, you would in actuality only be at 45% SOC. Then if you charged back up to what you thought was 100% and immediately stopped charging once your battery monitor says you are at 100% but in fact if it once again fell short you might only be at 90% true SOC. If you repeated this many times in a row, then I can see you'd have a problem. (drift) Perhaps a good rule of thumb would be to make it a habit to continue to charge your batteries for a little while beyond the time when your monitor says you just reached 100%. Or, if your monitor shows amps going into your battery while charging, you can get a sense that way as to how much "charging" is still happening once your monitor reaches 100%. This "drift" problem gets fixed/reset anytime you do have a situation where your charger stays on/active for a long enough time after your battery monitor says you are at 100%. For example, if you do find yourself plugged in at a campsite and your monitor reaches 100% (even if your true SOC is less then 100% because it has been drifting) while you are sleeping and then continues getting you to true 100% until you unplug. Or, if you are driving from one destination to another and your alternator is charging the battery...if your monitor gets to 100% (when your batteries are actually at less than 100%) the batteries will continue to get closer to 100% as long as you are driving. This "erases" any of the drift delta that might have built up. Also: Most battery monitors tell you the Voltage it sees on the batteries. From most 12v SOC charts you can see that 12.06v resting voltage corresponds to 50% SOC. So if you ever see your battery resting voltage at 12.06v REGARDLESS OF WHAT YOUR BATTERY MONITOR SAYS percentage-wise, you should charge your batteries. Likewise, when your batteries are truly fully charged to 100% they will likely read ~12.7v at rest. If your monitor says it is 100% full but your batteries are only at 12.4v or 12.5v then you should continue charging until you get all the way up to 12.6-12.7v at rest. If your batteries never get there, then there is likely a problem with your monitor voltage reading (you can test by putting a voltmeter directly on the batteries) or a problem with your batteries. -Chris
FWC 11/18/20 03:07pm Tech Issues
RE: What's a good battery level monitor?

The issue with many (most?) of the cheaper battery monitors is that they don't resynchronize with a fully charged battery, and they don't account for charging efficiency. As a result they can drift well away from the true SOC over time, which can provide confusing information. Better monitors will detect when your battery is fully charged (based on the charger switching over to float) and will reset the SOC back to 100% and will also account for the fact (with lead acid) that you need to put 21A back in to replace the 20A you took out.
FWC 11/17/20 09:11pm Tech Issues
RE: What's a good battery level monitor?

The OP did ask for a 'good' meter not necessarily a 'cheap' battery monitor. For a good meter, you can't go wrong with the Victron 712 (with a display) or the Victron SmartShunt if you are happy to look at the data on your phone/tablet/laptop. If you would prefer 'cheap' then any of the many no-name panel voltmeters or current shunts will work.
FWC 11/17/20 08:52pm Tech Issues
RE: Elon's Starlink Internet Service

If only rural customers in the US sign up, the company will go broke without MAJOR government subsidies. Maybe, in the future, when every remote area of the World is covered by his service he will be able to use that money (you know, they have LOTS of money in the remote reaches of the Outback and the desert) to subsidize the lack of US customers. One of the biggest questions is why would anyone with good cable/fiber for nearly nothing want to sign up for this service? They answer is no one. So that only leaves the under served as potential customers and that's a much smaller base than the current internet providers have to draw from. Don't get me wrong, I am hopeful it will be successful, will be mobile usable and will be reasonably priced. But, for now, my AT&T Mobley @ $23/month (truly unlimited) has served me very well throughout the US. There are ~ 30 million people in the US without access to reliable broadband, and about two times that number that have very limited broadband options (like 1 - 10Mb DSL). However that is not the masin market - there are 3.8 Billion people in the world without access to broadband. If Starlink, or one of its competitors can reach a small fraction of that market, they will do very well, and it will have a hugely positive impact on developing countries.
FWC 11/15/20 11:52am Technology Corner
RE: Elon's Starlink Internet Service

Like everything else the rest of the world will receive this service for free or very cheap reduced rates. Just saying. I am not sure what you are getting at here? Starlink/SpaceX is a private company, they can and will charge what they want. They very well may end up charging less in the developing world, as that is what the market will bear. Why would they charge less here than the market here will bear?
FWC 11/15/20 11:47am Technology Corner
RE: Elon's Starlink Internet Service

I wonder if these satellites will eventually be used to track all 5G users? Not if you have your tin foil hat on.
FWC 11/14/20 09:23pm Technology Corner
RE: Elon's Starlink Internet Service

The early reviews I have read about the Starlink Beta tests are extremely promising, and consistent with the speed tests listed above. 100 - 120Mb down and ~30Mb up. Latency is also good, ~20ms. As of now they don't have the satellite to satellite backhaul operational, so you have to be able to see a satellite, and the satellite must also be able to see a ground station. Once the sat-sat link is running, then it can be a truly global network service. For now they are fixed operations only because of the reason above, and because that is all they are licensed for. However they already have some marine terminals deployed, so mobile operations are definitely coming soon.
FWC 11/14/20 09:23pm Technology Corner
RE: Turning off the Charging Process

There are devices that will measure temperature and turn on or off charging. Of course, SiO2 do not need such devices. OMG! If you read the OP and the 3 posts above you, they already have lithium batteries, and the batteries have a low temperature cutoff built in.
FWC 11/08/20 09:34am Tech Issues
RE: Solar + DC to DC Chargers

There is no easy way to do this while maintaining the solar charge to the truck. The most reliable way would be to run another wire for the solar charger, and have the main wire for the DC-DC charger be switched. A '14V relay' is not going to work. First, you would want a Voltage Sensing Relay (VSR) not a '14v relay'. Second, when your solar charger is charging your truck battery is will trigger the VSR, which will start your DC-DC charger, which will pull your truck battery down and it will likely end up in a on/off cycle. One other question - do you really need the DC-DC charger? What sort of charge current do you get with out it?
FWC 11/08/20 08:54am Truck Campers
RE: Turning off the Charging Process

Exactly right. You don't need to do anything. If the batteries think they are too cold to charge, they won't charge. It is controlled by the internal BMS. Also realize it needs to be below 24F for a significant amount of time for the batteries to activate their low temperature charge protection, they have a lot of thermal mass. Battle Born batteries have a built in BMS (Battery Management System) that prevents charging at temps below freezing. No need to disconnect battery. You can still discharge well below freezing. X2. The whole purpose of the BMS is to keep things from happening to the battery that shouldn’t. A BMS isn’t required to charge a lithium battery. It’s what is needed to make an acceptable lithium battery for use by non-technical consumers.
FWC 11/08/20 08:45am Tech Issues
RE: SiO2 Battery -UPDATE 4 (MW at 20% SOC)

I agree, that can't be the actual price. They have lead in them, and lead is a commodity that is worth much more than $6 per 30kg. Here are more reasonable looking offerings: MCA Battery These look very similar to the various retail options, I would be fairly sure they are buying pallets of these (or similar) with the 'your label' option.
FWC 11/03/20 04:04pm Tech Issues
RE: SiO2 Battery -UPDATE 4 (MW at 20% SOC)

Pretty sure they are all made in China, but BFL13 should be able to tell us.
FWC 11/03/20 03:23pm Tech Issues
RE: SiO2 Battery -UPDATE 4 (MW at 20% SOC)

Here is another outfit selling 'Silicone' batteries, it is hard to tell but these look to be the same as 'SiO2' and 'Lead Crystal' batteries: http://www.siliconebatteries.ca/sp.html I wonder if these are all coming from the same factory in China? If you are want to buy direct from a manufacurer they are cheap: Direct from China
FWC 11/03/20 02:29pm Tech Issues
RE: SiO2 Battery -UPDATE 4 (MW at 20% SOC)

This doesn't actually provide any useful information on whether the manufacturers claims are actually true - as the review just rehashes the marketing claims. And the 'results' don't provide any actual data. It is also a little suspicious that this 'review' seems to be used as a testimonial by the manufacturer, even thought the review doesn't actually provide any independent information and links back to the manufacturer. Is this guy another influencer? Who knows? FWC, The owner of the sanidump site has a 'real life' evaluation of the SiO2. https://www.sanidumps.com/product-testing-rv-batteries.php From his site: "Results After about a year (2020) of using the SiO2 batteries, I'm I happy with them - Yes! Having more useable power is great when the weather is not behaving, I prefer not to use a generator. I do have a lot of solar on the RV but I have been in situations where the sun does not fully charge the batteries every day. The extra capacity enables us to continue RVing in these poor weather conditions without the generator. I have been with friends when their RV had to be recharged, with the SiO2 batteries and solar I was able to recharge their batteries from my RV without using a generator and we continued RVing."
FWC 11/01/20 10:20am Tech Issues
RE: SiO2 Battery -UPDATE 4 (MW at 20% SOC)

Which batteries are you describing here? What actually is an SiO2 or lead crystal battery? I know I have been harping on this, but so far no one has actually been able to explain what these batteries actually are, or provide any independent or academic description of these batteries or an independent assessment of their performance. It is just been a bunch of marketing materials and claims from the folks selling these. None of the major manufacturers, or usual resources (Battery University, The Battery Reference Book, wiki etc) discuss these at all. It is weird that all of a sudden these are being pushed here and on a bunch of other sites with little to no actual experience or supporting data. On whether an SiO2 is a Gell or an AGM: "The "SiO2" is a lead crystal battery. I am not too clear on this, but it seems it is not a ""lead-gel", but it does have an electrolyte that might be similar. The idea it is a modified "AGM battery" comes from the separator being AGM -and improved from ordinary AGM according to this blurb: "Lead Crystal® batteries use a new advanced type of AGM material as a separator. The AGM has much higher electrical conductivity, heat resistant and acid resistant abilities than standard AGM on the market. The crystallized electrolyte in combination with the AGM can effectively protect the plates and prevent the active material from falling off during use. The electrolyte is completely absorbed and stored in the AGM. Since the AGM is completely saturated with electrolyte then crystallized, no free liquid electrolyte will be present in the battery. The "battery can now be used in various directional positions without leaking." Good info here! https://www.gliderpilotshop.com/lead_crystal
FWC 11/01/20 09:43am Tech Issues
RE: Battery Type and Inverter Alarm

The 1C rate is typically a BMS limit. The intrinsic discharge rate is dependent on the cell design but can range from 5C to 50C, continuous. If resistance is low in Li chemistries then why is the safe rate of continuous discharge typically 1C? Rate of continuous discharge on the SiO2 is well over 3C.
FWC 11/01/20 09:30am Tech Issues
RE: Battle Born Lithium

I think we have had this discussion previously - a gel battery is a lead acid battery where the sulfuric acid electrolyte is absorbed into SiO2 powder. I am not sure how an 'SiO2' battery differs from this, besides marketing? Gel/AGM/SiO2 are all valve regulated lead acid batteries (VRLA, ie sealed) so I guess you could claim they are all modified versions of each other. A higher quality AGM like Odyssey/Northstar have internal resistance around 2-3 mOhms, cheaper ones like Renogy are around 4-5 mOhms. LiFePO4 (eg Lithionics) are at about 3 mOhms. In these cases you will have 30 - 60% lower voltage drop under load.
FWC 10/31/20 01:47pm Tech Issues
RE: Battle Born Lithium

Gel electrolyte batteries typically have a higher internal resistance than AGMs, so you would expect 'SiO2' batteries to have a higher internal resistance and higher voltage drop under load. Furthermore, the internal resistance rises as the SOC decreases (all batteries) and lead acid voltage decreases rapidly with decreasing SOC, leading to the shutdowns you are seeing. LiFePO4 has a lower internal resistance to start with (although the BMS can add some resistance), higher starting voltage and very little decrease of voltage with decreasing SOC, making it better suited to high load situations.
FWC 10/31/20 12:16pm Tech Issues
RE: House and Engine Battery -Update 2-Surge? REGEN threat!

Like most good rumors, there is some kernel of truth. There are some limited situations where a DC-DC charger could be warranted, but in most applications they are not needed. They are certainly not needed to prevent 'surges'. Sterling and Battleborn are in the business of selling things, if they can convince/scare you into buying more stuff from them, better for them. Battleborn in particular has some shady marketing practices, so I am not at all surprised that they would try to convince you to buy a $350 DC-DC charger (that they conveniently happen to sell) to 'protect' the $1000 battery you just bought from them. Kind of reminds me of this: Fargo - TruCoat
FWC 10/30/20 09:23am Tech Issues
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