Recent content by schroederjd

Long overdue build update here... Finally have pretty much everything installed and running. Surprisingly, very few issues to speak of. I'm very pleased to report that my approach to separate-port battery protection seems to be working well (one 'winter' design flaw, more on that later). As...

This is where your specific setup will need to dictate the device(s) required for disconnecting loads and charging. As an example, for my 48V bank, the only loads I have are the inverters (nothing else connected to the batteries), and those inverters have on/off switches that specifically turn...

What are you using to disconnect charging? Are you running your setup as common or separate port?

I ended up going with a TinyBMS from Energus. It’s working ok. My setup is similar to the Batrium in that I don’t have any current going through the BMS (I use a 5A SSR to in line with the inverter’s power switch to control the loads, and a 40A SSR on the positive line of the PV panels to...

No. System voltage is not a factor. I come to the same conclusion as iamrich. 300w/hr is ~25% duty cycle for a 1200w (10A @ 120V) mini split. Unless you think it will need to run less than 15 min of every hr (and you don't need ANY power for ANYTHING else), it's probably not going to work.

I assume you're looking at the WatchMon4 with the blockmon cell monitors? I considered that option for my build, but decided it was a bit out of my price range. I believe you are correct that no current flows through the Batrium BMS, so the current limits are a function of the...

I already sent mine back and have a new board on the way. Hopefully the new board works!

Not sure what you were looking to use the Bluetooth/PC connections for, but another path to consider would be to use a 'dumb' BMS along with a separate 'smart' battery monitor. A 4S-100A BMS from JBD is only $20 on AliExpress. Two of those (for a 4p2s configuration) plus a smart shunt...

I don't have any experience setting up a 12V pack, but based on everything I've read on this form, if I were going to build a DIY 12V battery, I would probably go with an JBD (Overkill) 120A BMS (one per 4S pack). At 12V, having two batteries in series just makes a lot of sense to me (lower...

I attempted to diode-protect my Mean Well HRPG-300 using a series of 30A schottky diodes. I just couldn't get the power supply to work when the diodes were in line. To overcome the voltage drop (the ones I used had 0.5 V forward drop), the supply would have to increase the voltage above the...

So, after finishing up the low-pass filter for the current sensor, I turned my attention back to the BMS-to-MCU-to-Inverter Comms. I was making some great progress on getting the 'dialog' between the MCU and the Inverter ironed out. I coded in the CheckSum calculation, so that is happening...

No, I went with the TinyBMS s516 in a 16s configuration. I’m running in separate port mode with external relays for charge and discharge. Charge relays are 200V/40A on the PV in lines, and discharge relays are 80V/5A wired in line with the inverter switches on/off switches. Now that I’ve got...

Parts finally came in for the active low pass filter that I'm adding to the current sensor. As a reminder, I'm currently using a TinyBMS with an external current sensor (LEM DHAB S/133). I've been fighting variability in my current readings since I hooked up the inverters. I put together a...

I'm also looking for a good solution for racking 300W panels on a metal roof (9:12 pitch, trapezoidal 'PBR' panels, perlins 2' OC, on edge). I'm currently leaning towards the Tamarack system (offered by Alte-store), but the attachment system is definitely the sticking point. I'm considering...

Well, I've now tried two cables on two different computers. The second computer seemed to have more success uploading the firmware (it made it through the "program" and "verify" steps; however, the inverter would never restart after the update. It would just keep beeping. And after powering...