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  1. JAndle

    Rosen Solar from Alibaba, anyone have experience?

    very specific to retiring in Belize... and for personal goods in the first year. Qualified Retiree Program. I cannot have any business dealings in Belize or with Belizeans other than as a user of services, have to inject hard currency into the banking system annually, and get a year of...
  2. JAndle

    Rosen Solar from Alibaba, anyone have experience?

    I have a broker on this end who looked over the B/L, but I also have a tax and duty free letter under my visa program, so I expect to be OK.
  3. JAndle

    Rosen Solar from Alibaba, anyone have experience?

    apologies in advance for going sideways on the topic... I am building in Belize where I can bring things in my first year with great tax incentives but after that warranty parts even cost crazy on tax and duty... I spent six months circling around between Rosen (48V vs 51.2V), Wisdom, and...
  4. JAndle

    Rosen Solar from Alibaba, anyone have experience?

    I was planning Rosen but got a better package from Wisdom/BSL, departing for me soon (at the logistics company). 51.2V 200AH - 5 plus a custom combiner and a sixth solo. the 200AH batteries were under $2000 when I bought but prices are up. Using them with Sigineer but they are identical to...
  5. JAndle

    Anyone have the BSL BATT - Lithium Batteries?

    I have placed an order and now they tell me there are delays for R&D. The person I was working with is gone. More as it unfolds, but I should have stuck with Rosen or Sigineer...
  6. JAndle

    Any Reviews on Meritsun 10kwh 48v from Alibaba?

    I have not looked at MeritSun but I have been comparing Rosen, BSL, Sigineer, and Polynovil 200Ah 48V/51.2V systems. The Rosen and BSL systems are also close to $2K, Sigineer a bit higher and Polynovil about 25% high. Leaning to BSL for their rack mount 10kWh x 5 plus combiner so far. I won't...
  7. JAndle

    Overpaneling generic questions

    You cannot exceed max PV power after adjusting from STC to your local insolation. Belize is +35% in May-July. You cannot exceed max open circuit voltage at coldest temps. You cannot exceed max short circuit current after adjusting from STC to your local insolation. If you obey all of those...
  8. JAndle

    off grid home system - comments on some details...

    I am pretty comfortable with the system on the right (rooftop panels, inverters, battery, etc. I am also pretty comfortable with the little remote power system on a 20' container for outdoor power. It makes sense to put the generator in the ventilated container and it makes sense to also use the...
  9. JAndle

    Rosen Solar from Alibaba, anyone have experience?

    Trying hard to stifle a reflexive "China...", but I failed.
  10. JAndle

    Overpaneling generic questions

    Caution on MPPT - it is not limiting instantaneous current but is pulse width modulating it to look like an average current. The panels and the batteries are fooled by this, but the max short circuit current of the controller MUST be honored or you risk melting bond wires or damaging the...
  11. JAndle

    Rosen Solar from Alibaba, anyone have experience?

    Sorry to hear that. Is 28 their full pallet for those panels or did they just load panels onto a pallet?
  12. JAndle

    Rosen Solar from Alibaba, anyone have experience?

    In Belize 12.5% GST and steep duties on components. Bona fide kits get favorable treatment, but I am just getting started with customs aspects. I expect 25% all in on the kit. Pallet of panels, six batteries, a rack, and four inverters MIGHT fit on two pallets and cost a bit over $1000...
  13. JAndle

    Rosen Solar powerwall - Where to buy?

    The price on Alibaba not for 48v 200ah battery price , just the advertise use to attract clicks , this is ruled by Alibaba, the real price based on quantity and capacity, sorry to misunderstand you. Best regards, ... basically Alibaba seems to encourage stiupid pricing to get clicks and...
  14. JAndle

    Rosen Solar from Alibaba, anyone have experience?

    How did that work out @gramos100?
  15. JAndle

    Rosen Solar from Alibaba, anyone have experience?

    Where in the Caribbean? Comparing Rosen, BSL, Sigineer, and United Power Tech for bespoke system quotes shipped as a kit to Belize. Definitely interested in real reviews on Rosen and the other three. Impressed with Franklin's support at Sigineer. Almost certainly using Sigineer (but...
  16. JAndle

    are 96V LiFePO4 a good idea?

    LFP for sure. Not LiPo! I have seen Li titanate lately?? Also Belize, so the rules are ill defined. UL will help and be faster (or at least a CE.IEC equivalent). My credentials and a good engineering job should suffice. Looking for good batteries with fewer middlemen marking them up. I...
  17. JAndle

    are 96V LiFePO4 a good idea?

    Rosen (I think) had a 96V/100Ah integrated BMS unit. I may be recalling a different unit. Sigineer has a 96V solar inverter but I am backing off 96V unless it becomes more widely used. There is a difference between state of the art and sole source ;) I think Merit and a few others have 96V...
  18. JAndle

    are 96V LiFePO4 a good idea?

    If you only touch one phase on split 240 yes your body capacitance is only shunting one phase to ground, at the equivalent of 170V peak. We fear what we don't work with, but hopefully we respect what we do work with. I originally started with the 96V batteries would need to be in a NEMA...
  19. JAndle

    are 96V LiFePO4 a good idea?

    or 240V for dryers, pool pumps, central HVAC, ovens...
  20. JAndle

    are 96V LiFePO4 a good idea?

    There are a number of vendors in China for 96V and higher LPF packs. None I trust yet, but in the decade plus of dealing with China Southern and State grid it has been unsettling that it is them innovating and pushing efficiency and us doubling down on fear over science.
  21. JAndle

    are 96V LiFePO4 a good idea?

    I have a place where you can store your condescension. Unfortunately it is already full with your incorrect assumptions.
  22. JAndle

    are 96V LiFePO4 a good idea?

    Well, 240Vac is dangerous too. I work with up to 40KV so I don't tend to think that way, but I should... It would require all the battery connections be in a NEMA enclosure, so there is cost and effort involved. I can find MPPT chargers up to 384Vdc/80A etc. and 96V charger/inverters that...
  23. JAndle

    are 96V LiFePO4 a good idea?

    Seeing 96V charger inverters out of China and thinking this is an emerging trend... Allows higher MPPT efficiency for long strings, so reduced copper needs and reduced copper losses. EG 3s and up 144 half cell systems with 120V+ Vmpp would readily charge 96V banks and 96V would be more...
  24. JAndle

    Rosen Solar from Alibaba, anyone have experience?

    Thanks. If I get through closing in time this spring I MIGHT get fill and pilings in before the rainy season... then there's a chance I am ordering materials in the spring and setting things between rainstorms next summer. Still, I agree 100%. I am looking at what is best now and just scoping...
  25. JAndle

    Rosen Solar from Alibaba, anyone have experience?

    My timeline is late 2022, but also seriously considering Rosen - at least for panels and LFP batteries. Seems like everyone was waiting for delivery a year ago then got too busy to say if they were satisfied?
  26. JAndle

    possibly naïve question on integrated MPPT solar inverters (off grid, DC coupled)

    I have that chart/site - good to know it's the right source data. Yes, trees will be far enough removed to not be an issue. Due south but I am electing 0 degree for two reasons - it is optimum in the summer when I need the most load and it can lay spaced off a flat roof just under a course of...
  27. JAndle

    Sol-Ark Inverters 8 and 12K

    New to solar but this makes sense. The BMS in most other types of battery just need to present a dumb two-terminal device externally and limit conditions in the pack. As long as the charger runs a proper CC/CV cycle for that battery, any communications should just be for optimization and asset...
  28. JAndle

    possibly naïve question on integrated MPPT solar inverters (off grid, DC coupled)

    My loads will be balanced enough and average 15A total. If I get 240V air conditioners that will help a lot. Rain water system has a sub-HP pump. Also not starting ground work till November and Belize is a 2 year process to build anything so 18-20 months out from buying and installing. Plan...
  29. JAndle

    possibly naïve question on integrated MPPT solar inverters (off grid, DC coupled)

    I was not finding a good split phase all in one with high PV voltage. Just 'discovered' Victron autotransformer so now the better German and Taiwanese 240V systems are back on the menu.
  30. JAndle

    possibly naïve question on integrated MPPT solar inverters (off grid, DC coupled)

    Was looking at 600W panels with 50Voc and 40Vmpp so 10-12 panels is 6000-7200W, but 9600W divided by 48 so much easier... In Belize in June I also have 1350W/m2 peak insolation, so I suppose I scale Ipp and Isc proportional to the 1000W/m2 data (and peak power)? So the takeaway is, if I want to...
  31. JAndle

    Why did I buy 2AWG battery cables for my inverter?

    4x wire combiner aside, higher surface area allows more heat dissipation and short wires see the PCB as a heat sink at both ends, so ... maybe...? I tend to overdesign, so I am cringing, but maybe it's OK. I assume the ink on the UL/CE certs is dry? :)
  32. JAndle

    possibly naïve question on integrated MPPT solar inverters (off grid, DC coupled)

    I have been working out the basics but I am a little baffled by this: 9600Wp system (for example) to a 48V battery must be providing 200A to the DC coupled node but these systems all have max charging current well under 200A. Should I assume there is a 3-way FET or IGBT coupling so that the...
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