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  1. KevinC_63559

    Understanding Victron's VRM security

    This off, let me admit that I'm paranoid. Might also want to mention that served me well during my corporate and consulting life. I'm never surprised by what people try and get away with in contracts... anyhow: I have my first Victron Multiplus II up and running, and have a cerbo-like Pi...
  2. KevinC_63559

    From office UPS to whole house... my journey

    Seems having a personal journey thread is encouraged here, so here goes... (apologies for duplicate info from my earlier threads) So a couple of months ago we got hit with a 37 hour power outage. After watching solar develop over the past 50ish years (since my Dad first brought home a solar...
  3. KevinC_63559

    Designing panel/MPPT controllers around extreme weather?

    If I'm following design rules, I believe I need to factor in record weather to come up with an appropriate correction factor correct? e.g. Although our average minimum temperature is around -9C, its not uncommon to have a week or so at -20C. Looking at record temps, we have gotten down as...
  4. KevinC_63559

    How important is V-Sense to the health of my system?

    Have a newly installed Victron Multiplus II and am awaiting delivery of some wire to rig a V-Sense cable for it. Unit appears to function just fine without it, and the battery BMSes showed a near perfect (0.034V delta) balance after things ran for awhile. I hit the Victron Community and...
  5. KevinC_63559

    Supporting multiple Victron Multiplus II's?

    Hi. Just completed phase 1 of my project, with my computer, TV, and a number of related items now running behind a Victron Multiplus II and a pair of 12V LiFePO4 batteries. Thanks to Current Connected for their help. System went together with a limited number of surprises (ferrule crimper...
  6. KevinC_63559

    Local solar farm

    While traveling towards St. Louis on Monday I noticed a solar field on the way. It was across the highway, so couldn't really stop, but per the car compass the panels were facing south-west (compass not particularly accurate). I looked in the rear view mirror and verified they were bifacial...
  7. KevinC_63559

    sunwatts as a supplier?

    I've been using the Sunwatts website as a bit of a reference for things like $/watt, physical size, origin source, etc. I'm becoming concerned as I drill down farther. For instance https://sunwatts.com/550-watt-znshine-mono-bifacial-xxl-solar-panel/ is clearly advertised as a bifacial panel...
  8. KevinC_63559

    Really basic panel mounting questions

    I'm some ways away from adding solar to my "UPS" setup, but wanted to start wrapping my head around the mechanics of doing so. Thus some really basic starter questions. Please presume a ground mount system: 1) I presume panels are sufficiently rigid that support on the 4 corners will...
  9. KevinC_63559

    SOK 48V battery package question

    Hi guys... My current little project is 12V, with (2) Fiunie 100amps (I suspect no-name, no-warranty that would be enforceable, but they were cheap on Amazon (under $200 delivered) and have bluetooth BMSes - so good for my starter project). As I wait for my Victron based components to be...
  10. KevinC_63559

    Wood framing for solar panels?

    I have a 16x32 foot ex-data center that I'm thinking of modifying into a garage. Roof is East/West facing, so "ideal" for vertically mounted panels. I can modify the roof at will. Was originally wondering about using 10' 4x4s and XXL panels, but those appear to be about a 1/10 of an inch too...
  11. KevinC_63559

    UPS parts check please

    About to order the final pieces to replace a number of APC UPS gel cell based systems with a single large Victron and LiFePO4 based solution. Would appreciate a parts check - would be annoyed to order and head-slap realizing I missed some small something I needed. So: (1) Victron compact 2000W...
  12. KevinC_63559

    Battery Cables math check

    First, let me thank everyone who has contributed to my slew of questions under other threads: THANK YOU! Currently looking to sanity check cabling sizes from my batteries to a (for purposes of this discussion) Victron MultiPlus Compact 2000/80. So... clearly if the charger is pumping 80 amps...
  13. KevinC_63559

    Victron vendor recommendations in the USA?

    Close to buying my first Victron inverter/charger. Wondering if anyone has a recommended vendor, or equally valuable: Vendors to avoid? Thanks, Kevin
  14. KevinC_63559

    Victron Multiplus vs Multiplus II when NOT doing grid feedback

    As I mentioned on another thread, my electric Co-op has adopted rather hostile pricing for bi-directional metering. So not looking to feed power back into my local grid, ever. Even if they lightened up, my states rules allow them to do things like charge retail going in (call it 15 cents/kwh)...
  15. KevinC_63559

    Battery matching

    I know that when one runs batteries in series, like for a 48V system, the batteries should be 100% matches in terms of vendor, capacity, and age. I'm unclear on what the rules are for parallel strings (presuming each string is matched). For instance, can I start with 100amp batteries and later...
  16. KevinC_63559

    Victron MultiPlus II / MultiPlus II 2x120V in a home setting

    Per the Spec Sheet both units are designed as 120V inverters utilizing battery power when AC Power is loss. Cool, get that. Both units have a 240V pass thru mode (requires (2) MultiPlus II or (1) MultiPlus II 2x120V if I'm reading it right) where 50amps of 240V power is available on the output...
  17. KevinC_63559

    Thinking things through/Planning an endpoint

    A wise man once told me that its easier to get someplace if you know where your going. Realizing I'm playing around buying bits and pieces without really having thought out my end-point, or rather, having thought out several end-points and not picking one. So my current train of thought, in...
  18. KevinC_63559

    EVE LF280K V3 Grade A Cells - Too good to be true?

    Just stumbled on this link: LF280K That price is about $150 in 12V100A equivalence. Of course, one would need to add a BMS.
  19. KevinC_63559

    Good vs. bad BMS?

    Still new with LiFePO4 batteries, but aware that the typical 12V system uses 4 cells, and that a BMS is highly recommended/required to, at least, keep the cells balanced. Trying to understand what makes a good one, vs a bad one. To illustrate, lets compare two units. Our host 4 cell balancer...
  20. KevinC_63559

    Bootstrapping sanity check & Introduction

    Hi all. I've been tracking solar power since my dad brought home a few cells in my teenage years. I'm 65 now, so awhile... I love seeing things like the newer Hybrid inverters which seem to be pulling a lot of "wouldn't it be nice if..." things together (peak shaving, off-prime charging...
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