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jambouk

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About jambouk

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    Nottingham
  1. Thanks. I've ditched the two batteries in series idea for the time being, and just going to stick two big batteries in isolation,one connected to each of the outputs of the dual solar charger. If the two batteries are the same, and the load placed on each is the same, would you set the charging priority to 50:50? I'm still not really sure why the maximum I can send to battery one is 90%, and why I can't send 100% to battery one until its fully charged, then send 100% of power to battery two etc. Or is it sending 10% to battery two by default to at least put a bit of power into battery two to prevent it from degrading whilst battery one charges up? James
  2. Is the firmware the latest? Are any buttons getting stuck in the handset when you press them in?
  3. I asked a few weeks ago about charging two batteries from one solar panel. I’ve now got a solar controller which can do this, see below, but I’m confused by the instruction manual, especially how I should set the “charging priority”. I assumed the unit would charge battery 1 until full, then move on and charge battery 2 until full, then go back to 1. I’m not sure what this charging priority is - image of the relevant page from the manual below. I’d be grateful to hear what you think it means. Thanks. James.
  4. Should I put fuses where the green boxes are, or the purple boxes?
  5. Thanks, that is reassuring. Are you placing a fuse on the positive lead between the controller and the pair of batteries, or between the batteries and the thing they are powering? Or both? James
  6. I’ve since found the Amazon one on Ebay for £14.
  7. Something like this: https://www.amazon.co.uk/ECO-WORTHY-Controller-Auto-adaptive-Digital-Display/dp/B01B4AK9SM/ref=sr_1_10?keywords=Dual+Battery+Solar+Charge&qid=1578578415&sr=8-10
  8. Thanks. What is the capacity of each battery, and how long have you been using this set up with the same set of batteries? James
  9. The batteries will be kept in parallel all the time, and will be connected to the charging unit all the time, I'd envisaged even whilst under load, which will most likely be at night when the solar panels are not producing, but the batteries may also be put under load during the day time when the solar panels are active. One pair of batteries will power one thing, and the other pair power something else.
  10. Is the link suggesting this is just for batteries with capacity of 1-7 amp hours?
  11. If I have one solar panel, and four 12v batteries I need to be charged, two pairs of equal age and capacity (60 amp hour x 2, and 50 amp hour x 2) and the pairs have the same resting voltage and seemingly the same capacity, and I can get a solar charger unit which can charge two batteries (see link below), I was thinking of charging each pair in parallel. I've read about the risks of charging in parallel, with the weaker battery having the dominant impact and bringing the other battery down to its capacity, but in reality, how likely is this to be a problem in the course of 5 years, where the batteries won't be used that much anyway, maybe discharged 20%, just 10 times a year? I'm conscious there is scope to discuss lots of things around this, like "buy pairs of new batteries rather than starting out with old ones" and "buy larger capacity new batteries etc", but this is the set up we have and will be sticking with. Thanks for any replies. James https://uk.rs-online.com/web/p/solar-power-regulators/9054536?cm_mmc=UK-PLA-DS3A-_-google-_-PLA_UK_EN_Power_Supplies_And_Transformers-_-Renewable_Energy|Solar_Power_Regulators-_-PRODUCT_GROUP&matchtype=&pla-391749164546&s_kwcid=AL!7457!3!243856857002!!!g!391749164546!&gclid=CjwKCAiAu9vwBRAEEiwAzvjq-zrEd9pZ-QRkhK-Tpfd6UJFYhRnC8sQOzas0oXPQXq3zr44tGo3_MhoC_XcQAvD_BwE&gclsrc=aw.ds
  12. Thanks. The 24 page article is fascinating to read. Optically, it seems the differences are: - the EdgeHD is coma free as it has a lens inside the baffle tube - the EdgeHD delivers a flat field as it has a second lens inside the baffle tube - the EdgeHD may generate less vignetting as they have "placed the primary and secondary mirrors closer than they had been in the classic SCT, and designed new baffle tubes for both mirrors that allow a larger illuminated field of view." As you say, mechanically the differences are: - the mirror lock - ventilation ports as the baffle tube is now sealed with lenses inside. As I only really use the central part of the FoV for imaging, I can stick with the classic SCT, but can see the advantages of the EdgeHD for full frame deep sky stuff. James
  13. Thanks. That link doesn’t clearly explain the benefits over an XLT with a flatener but the 24 page PDF may do, and I’m planning on reading that tomorrow. Thanks for the link. James
  14. What makes the EdgeHD C11 £1,700 more than the XLT version aside the flat field? Is the field flatter than using an XLT with a field flattener which only costs £100? This is purely an academic question as I already own a standard C11 and was asked how much "better" the EdgeHD was, comapred to an XLT with a flattener. Thanks. James
  15. The more time the battery spends fully charged, the longer it will "last". I would certainly charge it up after use to get it fully charged, and then if you don't want to leave it on trickle charge, I would aim to put it back on charge for a few hours once a month. There is no evidence behind what I am saying. I would also store the battery in a garage so it is exposed to fewer swings in temperature. A discharged battery left in the cold is an unhappy battery. Equally you do not want it to get too warm. The modern intelligent trickle chargers do as said above, keep the battery constantly topped up, and undertake rejuvenation cycles to keep the sulphation at a minimum. I worked out once to leave a battery on trickle charge once fully charged was about 20p a month, £2.40 a year. If the battery is going to cost you £100, and leaving it on trickle charge for five years costs you £12 or so, I suspect at the end of the five year period, the battery will be pretty much as good as it was new, assuming you've not broken other battery rules. Else, if the battery has been left in a discharged state, and not topped up, you will have saved £12, but the battery won't be as good, and you may start thinking about buying a new one...,
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