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  • jajamezsz
    replied
    A good night of sleep always boosts my math ability, or brain in general. Maybe it was the reasoning sector telling me to double check the datasheets!

    The max power input is on the chart at teslachargers.com -> 18.5Vmp*40A = 740Wmp
    9 Flexopower 79W A-Si-Th-Fi's yield a max input power of 711Wmp = 19.2Vmp*37A
    looking at this from a non-discrete perspective (instead of 9panels@79Watts; Xpanels@YWatts, where X and Y can be decimal values) also clears something up:
    740W = 19.2V*38.5A, so it becomes apparent that 19.2Vmp is not ideal because the current never reaches 40A without exceeding the max power input according to the chart (740W)

    Another look at the 19.2Vmp setup reveals that it's really not too far off:
    It's safely under the max power limit at 711Wmp, and approaches the value of 740W to a 3.2% error factor, not bad!

    One thing that bothers me, however, is that the max input power of a standard 40A12V charge controller (recommended by the seller of the panels, the Tracer4210an) came in at 520Wmp...at 40A, that's only 13V!! What in tarnation is going on here??

    More investigation and creative number crunching comin atchya!

    Leave a comment:


  • jajamezsz
    replied
    Just bought the S40A12 second-hand...
    Wondering if I were to run 19.2Vmp, 26.4Voc with 9 of these panels in parallel if it would get hot...37A*(0.7Volts-above-ideal)=26W excess heat, but running at 37A rather than the full 40A...?
    These panels are next to impossible to find...I am almost ready to settle for 37A and a slightly higher than ideal Vmp, but will keep looking. I've heard of Xunlight, Stion, and Uni-solar so far, so I am not quite done searching altogether. It would be nice to get closer to 40A and 18.5Vmp.
    ("Flexopower": https://www.ebay.com/itm/Flexopower-...26d3df6be1b8fd)

    Leave a comment:


  • jajamezsz
    replied
    Hi I am thinking a setup with the S40A12...here are some of my thoughts:

    4x100Ah deep-cycle flooded lead-acid batteries
    600W of Amorphous Thin-Film Silicon Panels

    I basically just used the math from previous posts

    The numbers match up nicely with 12V and 15V, giving C20 rate: 20h*20A*12V=4800Wh, panels: 4800Wh/10h(1/.8)=600W in the W.C.S., and 40A*15V=600W max power for the S40A12

    Now just to find those panels! Seems impossible...
    Last edited by jajamezsz; 04-16-2020, 05:58 AM.

    Leave a comment:


  • liber63
    replied
    Very good, Aaron! I will contact you. Thanks!

    Leave a comment:


  • Aaron
    replied
    high vmp

    Originally posted by liber63 View Post
    Hi! Aaron,

    yeah i understand inefficient Vmp. The whole point with tesla solar tracker and amorphous is pushing the battery enough. I've read the pdf! I searched again today and found a 100w panel with Vmp20 and Voc27, similar to yours. Do you think it would be ok with Voc27? I can pm you more info. So what's it with Voc? How can you handle the number 27, is it in the range of S20A12?
    In addition to pushing the battery enough, it is an extremely efficient circuit with less losses that other other charge controllers. That way, you get more electricity from the panel to the battery as well as pushing it high enough.

    The S20A12 is 20 amps so x about 15 volts = 300 watts worth of panels.

    The vmp of 20 is a bit high. The circuit would have to dissipate about 20 amps * 1.5 volts (over 18.5 ideal vmp) = 30 watts of excess heat. That S20A12 does have a fan it it so might be ok. I'd have to check.

    Please email us at Tesla Chargers and copy and paste these posts and we'll let you know if that will work.

    Leave a comment:


  • liber63
    replied
    Hi! Aaron,

    yeah i understand inefficient Vmp. The whole point with tesla solar tracker and amorphous is pushing the battery enough. I've read the pdf! I searched again today and found a 100w panel with Vmp20 and Voc27, similar to yours. Do you think it would be ok with Voc27? I can pm you more info. So what's it with Voc? How can you handle the number 27, is it in the range of S20A12?

    Leave a comment:


  • Aaron
    replied
    vmp a bit low

    Originally posted by liber63 View Post
    Hi Aaron,

    I ‘ve seen you mention above that you use 100w panels that have Voc 26-27 Volts and Vmp 18-21, right?
    I have found amorphous panels with Imp: 4,09 / Vmp: 17,6 V / Voc: 24,2 V. I know Vmp is not the best, but that’s all I can find these days. If you have any suggestions, you are welcome.
    I understand that these 72 Watt panels have the right specifications to put 4 of them with the S20A12 solar tracker I want to buy. I only doubt about Voc being 24,2 Volts is too high, as I remember Peter mentions that in a video. But seeing that you use 26-27 Voc, I guess I should not worry, right?
    I got lucky with the 100w amorphous panels I got with vmp around 18.5. Then the company went bankrupt.

    17.6 will work but just won't push the battery as good. The VOC should be fine - is the vmp you want at least around 18.5 (optimally).

    Leave a comment:


  • liber63
    replied
    Hi Aaron,

    I ‘ve seen you mention above that you use 100w panels that have Voc 26-27 Volts and Vmp 18-21, right?
    I have found amorphous panels with Imp: 4,09 / Vmp: 17,6 V / Voc: 24,2 V. I know Vmp is not the best, but that’s all I can find these days. If you have any suggestions, you are welcome.
    I understand that these 72 Watt panels have the right specifications to put 4 of them with the S20A12 solar tracker I want to buy. I only doubt about Voc being 24,2 Volts is too high, as I remember Peter mentions that in a video. But seeing that you use 26-27 Voc, I guess I should not worry, right?
    Last edited by liber63; 06-08-2015, 04:02 PM.

    Leave a comment:


  • Michelinho
    replied
    Hi Aaron,

    Sent seven pictures to info@teslachargers.com in 2 emails. If you need more, I still have some.

    Take care,

    Michel

    Leave a comment:


  • Michelinho
    replied
    Found my invoice, jeff at Tesla Charger April 10 2014.

    Leave a comment:


  • Michelinho
    replied
    I think it was from Tesla Charger cause I bought it just after you made an announcement in the forum that they were in stock. I'll have to check to make sure.

    Michel

    Leave a comment:


  • Aaron
    replied
    where?

    Originally posted by Michelinho View Post
    Hi Aaron,

    Yes, I will do the pictures tonight and send them to the Renaissance site and no some of the circuit components were damaged from the heat of the rework station hot air and scraping removed the coating of the 3 resistors. The PCB is not damaged so it will be a breeze to make it work again by just installing new components (I have most in stock).

    Take care,

    Michel
    Did you purchase the charger from R-Charge or from Tesla Chargers?

    Leave a comment:


  • Michelinho
    replied
    Hi Aaron,

    Yes, I will do the pictures tonight and send them to the Renaissance site and no some of the circuit components were damaged from the heat of the rework station hot air and scraping removed the coating of the 3 resistors. The PCB is not damaged so it will be a breeze to make it work again by just installing new components (I have most in stock).

    Take care,

    Michel

    Leave a comment:


  • Aaron
    replied
    S3a12

    If you can email us some photos of this to the Tesla Chargers email, that would be greatly appreciated.

    I personally know everyone at the company that builds these circuits and cold solder joints are not in their vocabulary.

    If you replaced the diode does it work now? There are other components that can burn out from overload and the diode is 6amps to be overrated. We don't want to build a unit rated for 3 amps if the parts max out at 3 amps.



    Originally posted by Michelinho View Post
    Hi Aaron,

    I know it was overloaded so I wont ask for a RMA. it was hooked up to 65 watts (max) of input instead of 50 Watts as advertised.

    "The portable solar charging solution for up to 50 watt solar panels for when you’re on the go!" from Solar 3 Amp 12 Volt Lead Acid - Tesla Chargers

    If you don't know, the 6A40 is a 6 Amps diode, it had cold weld on each end and that was part of what killed it. The diode slipped out from the board while I was removing the resin same with one end of the 200 KOhm resistor and same with both ends of the 5W .05 Ohm resistor. The diode is probably the last thing to burn out in the circuit but arcing at the solder points will generate voltage transients and heat

    I checked the board under a magnifier and if it is the best quality solder you have on these units, it's probably true but the guy who did the soldering is the weak link, fire the bozo or give him a desk job checking the boards before they get the resin bath.

    Take care,

    Michel

    Leave a comment:


  • Michelinho
    replied
    Hi Aaron,

    I know it was overloaded so I wont ask for a RMA. it was hooked up to 65 watts (max) of input instead of 50 Watts as advertised.

    "The portable solar charging solution for up to 50 watt solar panels for when you’re on the go!" from Solar 3 Amp 12 Volt Lead Acid - Tesla Chargers

    If you don't know, the 6A40 is a 6 Amps diode, it had cold weld on each end and that was part of what killed it. The diode slipped out from the board while I was removing the resin same with one end of the 200 KOhm resistor and same with both ends of the 5W .05 Ohm resistor. The diode is probably the last thing to burn out in the circuit but arcing at the solder points will generate voltage transients and heat

    I checked the board under a magnifier and if it is the best quality solder you have on these units, it's probably true but the guy who did the soldering is the weak link, fire the bozo or give him a desk job checking the boards before they get the resin bath.

    Take care,

    Michel

    Leave a comment:

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