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Up-Side-Down

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Everything posted by Up-Side-Down

  1. Robert Nicholson .......... a fascinating fellow!
  2. I believe there has only ever been one edition of the Nics Broads and Fens guide published in 1986.
  3. Someone has been trying for the past 20 odd years but HCP refuse to bite. They maintain that there is a) insufficient demand and b) there are insufficient retail outlets in the area. Costed the exercise at least twice in that time! However, it is my understanding that Stanfords have commissioned a new Fens guide and that a well known figure, with considerable boating experience of the area, is hard at work on it ever now ....... .
  4. That sounds interesting. I'd be looking at charging with solar, wind and the occasional mains hook up. What would you see as equalling massive amps in terms of demand? How happy are lithiums anyway when it comes to heavy current draw?
  5. Well north of the Scottish Border but I have been known to travel (pre-coronavirus). I believe both you and Dr Bob have mentioned Jeremy at [email protected] before. Having to incorporate my own BMS into my system is slightly off putting at this stage of my knowledge and understanding but I guess I'll get bigger and bolder as I get a better handle on everything.
  6. Gotcha! Just shows how much I've still got to get my head around!! I should have looked at the total Ah for each set up rather multiplying the volts by the capacity: a totally spurious and contradictory calculation as I can now see. Thank you for putting me right ....... again!
  7. Is this a viable solution to the shortage of 'off the shelf' 24v products? https://www.roadpro.co.uk/product/08l-24v-12v-converters/alfatronix-24-30a-24v-12v-converter-c7505/C7505 I'm attracted to the advantage! 4 x 12v 100ah Victron lithiums cost £3671.52 while 2 x 24v 100ah Victron lithiums costs £3595.38. Less BMS I guess?
  8. I think you will find that the lowest bridge on the arm is the wooden footbridge at Smith's Farm just south of Western Avenue Bridge 17B.
  9. If my memory serves me correctly a PRM 120 'box takes about three quarters of a litre: https://www.eurocarparts.com/p/triple-qx-atf-dexron-ii-1-litre-522776082?gclid=Cj0KCQjw6sHzBRCbARIsAF8FMpVwq6oKu-xPN50AkpdIF2v8TNGiZbzh7nQ-Vp2rkttZlu0e8FWlrpsaAkZsEALw_wcB
  10. So I've devoted time to reading both these threads and am now somewhat the wiser. I'm not going to pretend that I currently understand everything but thank you Dr Bob for once again pointing me in the right direction. I will continue with my homework all of which I find fascinating. As always the fund of knowledge and experience on this forum is second to none.
  11. I've recently wrestled with the conundrum of what oil should be used in a PRM120 gearbox. Very long story short, I've spoken to PRM and whilst they acknowledge that original literature and recommendations stated that the same oil as used in the engine should be used (as with other PRM 'boxes) they now strongly recommended that ATF should be used in the PRM 120. I suspect for the reasons that Tony outlines. So there you have it: straight from the horse's mouth!
  12. It worries me even more ........... which is why I'm here! Thank you. Put like that it makes perfect sense.
  13. Thank you Alan this is precisely the sort of education I'm looking for ......... and it makes perfect sense explained in the way that you have. So going back to the thrust of my very first question, what happens to the 'surplus' electricity generated if I have say 100 Ah of available battery capacity and the day's sun has just produced 120 Ah ....... assuming I'm using a MPPT controller? (you'll see from this just how electrically challenged my brain actually is!). Definitely of the KISS persuasion where electricery is concerned .......... but I'm not beyond looking up coulombs and flow on Wikipedia out of curiosity. I just don't expect to fully understand it!
  14. Thanks Dr Bob. That's really helpful stuff which I'll take to heart. I take it when you quote an output of 30 amp that's per hour? I've not met the concept of the two voltage knees before so, yes, more reading required! Do Jeremy's lithiums come with built in BM?
  15. I find that a most helpful way of looking at it. The Whispergen seems like the most elegant solution for the alternative for the middle-of-winter period. Mr Boat didn't confirm (or otherwise) my understanding that they are no longer in production following the New Zealand earthquake. Can I still source a new one anywhere?
  16. 'expect that will be next show to go ..............
  17. And then, a couple of years ago, there were the pair of moorhens that (due to tardiness on the part of Scottish Canals) built there nest on top of one of the hydraulic propellor legs of the weedcutter moored at Bowling. That machine didn't go to work until mid-summer, between broods!
  18. If I add wee bit to take account of my boat being 59ft, then I'm paying a very similar sum and my circumstances are pretty much the same. I believe £10,000 is allocated to cover personal effects.
  19. Thanks Tony. Could you elaborate please on the 'depressed charging voltage' bit for the benefit of this bear with a somewhat compromised electrical brain?
  20. Thanks for this Mr Boat ........ real use/real results is what I want to tap into! 24 volt is probably the way I need to go for the living van set up I've outlined to Jen above as there will need to be at least one "electrical conversation" twixt the tug vehicle and the living van! Looks like my 100W wind turbine will need upgrading. For another project, I have serious interest in the Whispergen. From the research I've done so far it appears that production ceased in New Zealand when the earthquake struck. I've found reference to a Spanish connection but nothing to suggest that Whispergens are currently in production. Am I right? I'm one of the Rev Stirling's greatest fans and much disheartened that it would appear that I can't purchase a new Whispergen. Despite this I'd be very interested in your experience with one.
  21. Thanks for your reply Dr Bob. I need to get an understanding of the relationship between total panel output (in this case 1050W) and the capacity of the MPPT required to handle this safely. Is your 480 AH battery bank lithium? I'm assuming from your observation that it is and that you therefore have the ability to discharge by approx 90%. What's the life expectancy of s/h EV batteries and where can they be sourced? I'd be expecting to pay around £2000 + VAT for a new 300 AH lithium – i.e. Victron or Relion As you'll see from my response to Jen, I'm looking at a usage of around 100 amp hrs a day too – summer and winter. With a wee bit of lifestyle tweaking I can actually reduce this in the winter months.
  22. Thank you for your reply WotEver. My response to Jen I think covers your first two points. I'm looking to BtoB charging for the lithiums and am eagerly awaiting Victron's BtoB device promised for the end of last year. This seems to be the most elegant solution to the charging demands of lithium but with my lack of experience I may well be missing something.
  23. Thanks Jen. I totally take your point that I appear to be coming at this from the wrong direction. What I'm trying to do is get an understanding of any relationship between potential panel output and it's storage. To explain: I fitted my boat out 21 years ago before solar pv was a viable proposition. I am now half way through building a replica showman's living van which has space on its gently curving roof for a total of 1050W of flexible panels. I already know (based on the past 10 years or so of leccy bills – I'm on a landline most of the time) that I consume just over a unit per day so if my maths is correct, about 100 amps. This doesn't vary summer to winter as my cooking/heating/hot water is taken over by a Dickinson diesel stove October – April. In fact it can go down! I'll be using the living van to reach those places the boat can't go so anticipate that there'll be little change as I'll adopt the same cooking/lighting/etc regime. I guess one of the critical factors is how much of that daily 100 amp demand my 1050W solar will meet in the dead of winter. I'll clearly be looking at other sources of charge in the dark months! Having done my learning on the living van, it's more than likely I'll go for solar on the boat as at 21 years most of the electrical kit is getting towards its sell by date.
  24. If I were to install 1050 watts of solar panels what would be the ideal size for a battery bank? Given that I'm intending that the batteries will be Lithium, what's the minimum sensible size of the bank. As you will no doubt guess, it's the initial cost of lithium batteries that prompts this second question! Is there a Victron MPPT controller that will handle this size of bank and, if not can, it be split into two? I assume that it would have to be wired in parallel. Early planning stages for a brand new installation.
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