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  1. krby

    How hard would it be to build my own ~350W UPS board?

    I've posted in other threads about a DIY UPS I have working. It's a collection of bought components (some I had on hand). It's an inverter, a charger, and a battery bank. Technically, this is an online double conversion architecture. The inverter is running full time. I've had this running...
  2. krby

    Recommendation for small inverter/charger for DIY UPS

    I have built a DIY UPS for my home network rack. When I built it, I had an inverter already, found a good deal on the batteries, so I just bought a RV converter/charger to and build a double conversion-style UPS. It's been running fine since July and in the last few months I added an Arduino...
  3. krby

    Head check on bulk & float voltage for Renogy AGM

    TL;DR: For various reasons, I'm using 14.4V bulk, 13.4V absorb, and 13.0V float voltages for an AGM SLA battery bank. Is this ok? I'm concerned the batteries might never get fully charged. Full background and question below: Background I have put together a DIY UPS for my home network rack...
  4. krby

    DIY UPS v1 done...How can it be better?

    Sorry for the long post, I think the background is important. In July, I put together an over spec'd DIY UPS for my home network rack in the garage. This setup is what's called a "double conversion UPS". It's running the inverter all the time. There is no transfer time when the power goes...
  5. krby

    Building DIY UPS with AGM DC Converter/Charger or Inverter/Charger?

    I have my home network gear all sitting in a small rack in the garage. The last few times the power was out to the house, our Internet connection was still up if I could power the gear. I did this for a bit using an inverter and an EV parked right in front of the rack. It's about a ~60W load...
  6. krby

    Full capacity in watt hours from 100Ah AGM and LFP

    I haven't been able to find this info anywhere so I thought I would ask here. I'm trying to spreadsheet out various battery costs, comparing different sizes, LFP vs AGM vs SLA as well as comparing different discharge depth. What I'd like to be able to do is know something like: a LiFePO4 4 cell...
  7. krby

    DIY UPS with battery, solar charge controller, and inverter?

    I was thinking about putting together a UPS-type thing based mostly on gear I happen to have already and I wanted feedback on a few things. My load is some home networking gear in a rack. It will be no more than ~220W of AC, probably more like 100W on average. In a basic solar setup, you have...
  8. krby

    Advice on ultra small project

    I've got an idea for a self-contained solar project. I've got gear I would like to put in a weatherproof box with a small solar panel, a small battery, and a charge controller. The load is 5-6W max at 5V DC, running 24.7 Locations would be Northern California, likely on a flat roof. Ideally the...
  9. krby

    Review Pacific Sun Systems / SpecializedPower 24V 200Ah LiFePO4

    Note: I am not affiliated with the company, and have not been compensated in any way for this review, I'm just a customer and I don't see much info about these batteries on this forum, so I thought I would share my experience. In a few different posts people have asked about the LFE packs...
  10. krby

    What voltage to use when estimating kWh for LiFePO4 capacity?

    Or... "How many watt hours are in a single LiFePO4 cell?" Before I bought my first big LFE, I had a spreadsheet of various options and in order to know if a given battery was "enough" for my use case AND to compare price per kilowatt-hour, I estimated the capacity of each battery in kWh. To do...
  11. krby

    Breaker and GFCI/RCD on a short run?

    I'm going to have a portable box with a Victron Inverter/Charger connected to AC input and 24V LFE battery. For the AC output, I want to run a pair of lines, each to their own NEMA 5-15 socket (a standard US 120V outlet) and each with their own 15A breaker in line. This will all be inside the...
  12. krby

    Looking for a dual line NEMA 5-15R

    I would like the output of my inverter to be two NEMA 5-15 outlets. Each on its own branch and each branch with its own breaker. This is all going in a portable box, so I'm going to cut out the wall of the box and panel mount the outlets. What I would really like is for this look: But...
  13. krby

    Cheap adjustable/variable DC PSU

    If your hobbies include anything with, DC powered devices, batteries, inverters, electronics, etc. an adjustable bench top DC power supply comes in handy a lot. Off the top of my head from the last month or so: - Configure Inverter/Charger that requires a DC source, but your battery hasn't...
  14. krby

    Advice on connectors for 200A 24VDC

    For my mobile electric generator, I'm considering having the battery in a separate container from the inverter/charger and other electronics. To make make setup and teardown easier, I'm looking at high current connectors for connecting the 24V battery to an inverter charger. I'll have a 200A...
  15. krby

    Will this work for pre-charging inverter capacitors?

    I'm building a mobile-ish setup that will have a battery disconnect (one of the big RV / Boat from Blue Sea or similar) switch between the battery and the inverter charger. I'll leave it off most of the time. I would like to avoid the high current inrush and spark at the switch when switching...
  16. krby

    Grounding for mobile box?

    I'm building a portable electric generator. Plans are here: DIY mobile electric generator It won't be permanently connected to anything. Plugged into a house AC socket to charge, then moved wherever I need it and have the load plugged in to its AC sockets when I use it. What do I need to do...
  17. krby

    Advice for non-solar power box / electric generator

    UPDATE: I'm posting updated parts and diagrams in the thread as I go, leaving the existing drawings in place so the thread makes sense. In another thread, someone suggested I could post here for advice. I'm building a portable electric generator similar to Goal Zero or Kodiak but without the...
  18. krby

    Any experience with Pacific Sun Systems / Specialized Power Systems?

    After looking up costs for drop-ins and cells, I've found what looks to me like a good deal for my project (thanks to @KateLee for posting this link) http://specializedpower-net.3dcartstores.com/24-Volt-200-Amp-Hour-LIFEP04-Lithium-Battery-24V-200AH_p_12.html I've been sizing for 24V and...
  19. krby

    Can I get away with 95-100% DOD?

    I'm planning on a portable power station, using LFE batts. The case will be to keep it charged most of the time, then take in on camping other other outdoor trips, and then use it for the occasional power outage to keep the fridge and a few other things running. I expect to cycle it _maybe_...
  20. krby

    Inverter/Charge Combo or separate devices?

    I'm building a portable power box with LFE cells. It's sort of like a PowerWall, but not tied into the grid or the house permanently. It'll charge from a standard AC plug, stay charged most of the time and then I'll use it during blackouts, camping, etc. I'm sizing it for about 3-4kWh of usable...
  21. krby

    DIY Portable power station.

    Not sure if this is the right forum, but "DIY PowerWalll" didn't seem right ever. Moderators, please move this if needed, or let me know and I'll repost somewhere else. I'm thinking about building a 24V 100Ah LFE pack for a "Goal Zero"-like portable power station. I would like at least 4kWh of...
  22. krby

    Building 3-4kWh battery bank, is this reasonable?

    I'm would like to build a sort-of portable power bank. This idea started out as way to power the fridge for a few days during PG&E's scheduled blackouts. But now that I've decided to build one, I'm finding more and more things I would use it for both in and out of the house! From my research, I...
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