Recent content by Aphers

  1. A

    Which MPPT is easiest to reconfigure?

    I was toying with running both 12v and 24v systems, but I've decided to stick with 12v throughout. Have just been offered a good deal on a B2B so that might be the way to go, rather than reconfiguring the MPPT.
  2. A

    Which MPPT is easiest to reconfigure?

    Thanks both. 200w in to a 12v system, I know in theory that's about 17A, but I also know that a) the voltage will be higher, and b) the panels won't actually reach full output often if at all. So I guess 15A would be fine. In reality, if I went 10A, would I actually be losing any power? Boat...
  3. A

    Which MPPT is easiest to reconfigure?

    I'm going to be running two systems on my boat- 200w at 12v feeding a lead-acid bank, and a 600w, 32v PV array feeding the LFP. The smaller system is primarily equipment that is only used when actually sailing, e.g. autopilot, instruments. Once I am anchored up I may want to tap in to that extra...
  4. A

    Old and new panels

    Thanks as ever Snooblers My 100w panel has 22.6VOC and 19.35VMP The 130w panels from the same supplier are 21.74VOC and 18.00VMP. Would you say these figures are close enough for me not to worry about it? I hear what you say about getting rid of the 100w panel I already have to simplify things-...
  5. A

    Old and new panels

    I've been reading up about mixing different sizes and specs of panels and getting fairly confused. I've already got a 100w 12v panel, but want to upgrade to a total of around 800w. I'd also add a new MPPT. If I buy more 12v panels and want to run everything through the same SCC, should I buy the...
  6. A

    Over-sized lithium bank with small array

    Thanks- still very new to this and a lot of what I've learned has been from the Nordkyn articles. Clearly there's a lot more to it than I had interpreted. I will amend my previous post. EDIT: it seems I can't edit my previous post, maybe I should report myself and get a mod to do it...?
  7. A

    Over-sized lithium bank with small array

    http://nordkyndesign.com/practical-characteristics-of-lithium-iron-phosphate-battery-cells/ "Memory effects in LiFePO4 cells were discovered and studied by Sasaki et al. [6] and the results published in Nature Materials in 2013. The authors illustrated that, under specific circumstances, the...
  8. A

    Over-sized lithium bank with small array

    There is supposedly a type of memory effect with LFP, where the voltage rise usually associated with reaching full capacity starts to happen earlier and earlier, if the cells are not fully charged. Whilst the cells have not permanently lost capacity, this effect will fool chargers into thinking...
  9. A

    280Ah 12v yacht domestic system

    I haven't actually bought the Epever yet, but was planning on the Tracer 60A, partly based on Will's reviews. Just a thought about the BMS... I reckon I could couple an Overkill with a Tyco relay... total cost might not be much more than a Daly, but higher total current capacity (500 Vs 300A)...
  10. A

    280Ah 12v yacht domestic system

    I'm trying to put together a 12v 280Ah system without breaking the bank or over-complicating things. It's as a standalone house bank on a yacht, charged by 60A solar (and if necessary, 30A B2B from the engine/SLA). It will power the fridge, inverter for the galley, and a few smaller loads, but...
  11. A

    Options for LVD protection for an inverter

    OK so I've stumbled across a 3kw inverter that is nicely in budget and has a LV alarm at 11.5v, and shutdown at "10-10.5v" which is a bit ambiguous but no worse, potentially, than the others in this price range. I think I may have found my cells supplier. Next up, BMS- Daly being the obvious...
  12. A

    LiitoKala 100Ah

    Well that's nice! And did you get charged for 4, or 8?
  13. A

    Options for LVD protection for an inverter

    Thanks. Even the really cheap units tend to have these, but the preset values are a bit wide, especially LVD which is usually just 10v. Mind you I'm finding the LVD for the Daly might be the same value so it would be a toss-up which one would kick in first. A Victron battery protect has a 12v...
  14. A

    Options for LVD protection for an inverter

    I've looked in to the Daly units and some of the reviews/comments aren't entirely favourable, e.g. failing fans and inability to deliver the claimed current. I guess I could generously over-size and go for a 300A unit? Or accept that I'm cheaping out and taking a risk with my cells :o I'm...
  15. A

    Options for LVD protection for an inverter

    @snoobler yes we're UK based (for now) so 230v. Plan to leave next year on an indefinite cruise. The budget can be somewhat flexible, but there is an entire boat to kit out and lots of priorities to balance. My default position is £700 for a bank of 4 Trojan deep cycle batteries, but I think I...
Top