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  1. elkooo

    Opus behaviour: Normal?

    Hello folks, I just got a new OPUS BT-3100 charger. Before I had a «Liito Kala li500» but it startet behaving strange on me (didn't measure voltages correctly and repeatedly accurate (at least not lately); not all slots had the same end-voltages and thus tested cells with different results)...
  2. elkooo

    220v inverter - which one for me?

    Hello, I now have a good collection of >3ah 18650ies to start with my 14s32p battery. The closer I come to that, the more I started looking for inverters. Recently I added more Solar Panels to our Roof (6 more --> ~2.5kWp). For those and the battery I would like to have a single phase...
  3. elkooo

    DIY ATmega BMS (followup to DIY Arduino BMS)

    This is a followup for an old thread, which was blocked due to inavtivity: Here is the Link to the old thread. SO.... Another little step is done: I just testet the first Atmega328 chips. With the help of some Arduino boards (I had a Atmega2560 and a Duemilanove compatible board which is...
  4. elkooo

    Battery Fire (and probable cause)

    So this is something that generally is not admitted with pleasure: I had a battery fire. It was probably caused by a spot welded nickel strip, that worked its way through the shrink wrap on the positive end of a cell (where the edge is already negative...). It was a 10s5p arrangement, housed in...
  5. elkooo

    NighPV - Batteries to use our solar power at night

    So this is going to be the introduction: Currently I am still in consideration / battery-harvesting / planning process. What already exists: Photovoltaic installation with a 3phase grid tie inverter that runs on around 600vdc (up to 1000 possible) and converts all the solar energy imediately...
  6. elkooo

    Safety: How hazardous can a 14s be to your life?

    Hey Guys So far I have only been dealing with 36v systems (which have 42v fully charged). If Itouch the terminals there, I was clearly able to feel current to flow. How safe is a 14s system (going to nearly 60v fully charged...)? I only have (a little bit) of experience with mains-shocks (been...
  7. elkooo

    spot welding fuses

    Hi all, SO... I have built myself a spotwelder out of a golf-cart-relay (500A) an old car battery and an arduino (which over a mosfet times the closing of the relay very precisely) :cool: . So far I have great success welding nickel-strips :D . This works now nearly every time (except for when...
  8. elkooo

    DIY Arduino BMS

    Hi I don't want to spend 1K$ for a Batrium. So I decided to do my own BMS. I already have some Ideas how I would like to solve it on the hardware side (see schematics conceptenclosed). The CPU unit will be an ATmega. It will measure each cell in cycles. To overcome common-ground-issues...
  9. elkooo

    Controllable grid tie inverter?

    Hello everyone, I am working on a battery, that should cover our nightly energy consumption. We have ~6.5kwp of photovoltaic panels. They produce about double the electricity that we need and I would like to charge my battery at daytime and drain it at nighttime. Therefore I would need a way...
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