Also, if you do not have the MidNite WhizBang Jr battery current sensing accessory for the Classics, it should help you follow the battery charge currents. It keeps track of Ah into and out of the battery, shows Net Ah, and can approximate Remaining battery Capacity, as well as allowing ending Absorb based on current flowing into the battery (Shunt EA).
The WBjr will need a Shunt, as well, if your system does not have one at this point. WBjr and Shunt shown is this Link:http://www.solar-electric.com/midnite-solar-whiz-bang-jr-current-sense-module.html
Here is a Link to the MidNite Forum:http://www.midniteforum.com/
Many members here use Classics as well. A DC Clamp meter is also a very useful tool, especially if you have multiple battery strings. Vic
Vic, Thanks for the response. I have a Magnum energy , me-bmk battery monitor kit and a Me-rc, to control and monitor my MS2812. Would i still need the Wbjr? I have a 500amp shunt already.
Am not familiar with the me-bmk monitor. If you do not desire to use End Amps allowing the Classics to end the Absorb stage based on battery current, then you may not need the WBjr.
The Wbjr can share a single. common Shunt with other battery monitoring devices, and a 500A, 50 mV Shunt is the Default that eh WBjr uses. Just parallel the shunt connections that go to the Magnum bmk, with the PBC contacts on the WBjr PBC. The only issue might be, as BB Bill noted, might be weather the WBjr board will fit onto the Shunt, and also weather there is room around the Shunt for the WBjr board.
Why is this Feature not integrated into the Classics already, would seem to be something the charge controller should be able to do already? More stuff to buy i Guess. I'm pretty sure my Shunt will work but will Measure it tomorrow. I should have plenty of room. Does it work with multiple Classics or in follow me mode?
Much of the WBjr IS integrated into the Classic CCs, AND that is the reason that it is SO inexpensive. One reason that all of these kinds of accessories are not all built-in to many of our Solar widgets, is that many of us use multiples of things like MidNite Classics. So, in your case with two, or more Classics you will not need to pay for two of these when buying the Classics, if it was built-in.
YES only one WBjr will be needed when you are charging a single battery, and the WBjr works well in Follow-Me.
It is just my opinion, but I think that the WBjr is a real deal, at less than $50.00.
In comparison, here is what Magnum wants for the BMK ,,:http://www.solar-electric.com/magnum-energy-battery-monitor-kit-no-shunt.html
Think that MidNite is being very fair with the price of the WB.
BUT, you may not really need the WBjr, if you do not want to end Absorb by using Shunt EA on the Classics.
Just my opinions, Vic
The only point that I was trying to make by comparing the Magnum BMK with the MidNite WBjr, is that the BMK is about $165, and the WB is about $48, and they perform similar functions, in general.
The WBjr mounts onto the two Sense Lead terminals of the Shunt. The connections that the Classic CCs are presently connected to, are the CC battery Negative, and perhaps the PV Negatives.
YES, if you want the added functionality that the WBjr provides, (like Shunt EA), you will need the WBjr.
Please let us know how you are doing with your battery charge parameters. Vic
Would you mind telling us exactly what batteries you are running, and, any string configuration info, system voltage, etc. You may find someone here that is using the same battery, and will have advice for you.
Resting battery voltage is usually a good indication of battery State Of Charge (SOC). A Rested battery is one that has NOT been charged or discharged at all, for six or more hours (in general).
Normally, parallel strings of batteries are not recommended, but if you had two strings of batteries in parallel, you might be able to use a battery selector switch to Rest one string while still using the other. This switching will not work well on a 48 V system, but could be OK on 12 and 24 V battery systems (with some limits).
AGM batteries generally to not behave well when run with parallel strings, as they are very low impedance, and usually will not share currents well (ie one string can hog much of the charge current, for example).
Thanks for any added detail that you can offer. Vic
Thanks for the info on your batteries ... OH !! Ten 12 V AGM batteries in parallel!
Are these batteries the 12 AVR 100ET ?
I have not followed your comments in other discussions.
It is good that you are investing in large battery interconnecting cables. The Clamp DC Ammeter will help you monitor current balance, and take some corrective actions if you see significant imbalance in battery string current balances.
Many of our systems are not perfect, do the best that you can, that is about the best anyone can do.Thanks, Vic
pacog said:Impedance:<5.363 milliohms
Internal resistance<6.63 milliohms
impedance is AC resistance, and without the frequency the impedance is measured at, it's a worthless number
pacog,Thanks for the info on your batteries ... OH !! Ten 12 V AGM batteries in parallel!Are these batteries the 12 AVR 100ET ?I have not followed your comments in other discussions.It is good that you are investing in large battery interconnecting cables. The Clamp DC Ammeter will help you monitor current balance, and take some corrective actions if you see significant imbalance in battery string current balances.Many of our systems are not perfect, do the best that you can, that is about the best anyone can do.Thanks, Vic
vtmaps said:.I am clear on that, but at any frequency it cannot be less than the DC resistance. .....--vtMaps
RaysSubtropical, Thanks for the response? You have any experience with the Midnite Solar Classic and Classic Lite controllers? Trying to figure out how to set up the classics to properly charge and maintain my Bank. Thinks again for your time.
Have read the above Post, as pacog has both MN Classic and a Classic Lite (or perhaps multiples of each).