Recent content by Doug

I also struggled to find switches with a sufficient DC voltage and current ratings for my 48V battery bank (58V fully charged). I bought some for my 12V system (i.e. well within limits), but after pulling some apart, I was pleased with what I saw and bought more to use with my 48V system (close...

Thanks Steve for the heads up on the new model. I've been waiting for this. Since there doesn't seem to be a user manual released yet, does anyone know if the P series has CAN Bus, and if so, any protocol information?

If I were considering this, I would be careful about the grounding of the inverter compared to the charger. What happens if the inverter is positive ground and the charger is negative ground, or vise-versa, or some other difference between the devices resulting in a difference in ground...

Thanks Danner for explaining. This makes more sense now.

@Danner could you please explain how you activated the shunt trip from the 12V NO relay? What outputs does your BMS have? A Chargery BMS has a relay output that is activated in an ok state, and deactivated when there is high voltage and the same for low voltage. How would this drive a...

I have a similar issue. I have a 16 cell "48V" LiFePO4 battery (not pylontech) that is fully charged at just under 58V. I've been looking for a suitable battery disconnect switch. My max load is 75A and I have 100A fuses and 200A wiring. I only isolate the positive on disconnect. I don't...

Does anyone know of the release notes / change history for BMS main unit V4.05? I can't find this info. I currently have V4.04 main unit and V4.02 LCD on my BMS8T. This has been running continuously without issue for a number of months now, but recently I disconnected power to the BMS during...

I think you may need to obtain some expert help with this windows driver issue if you can't resolve it yourself. I'm not in a position to provide this to you, only to offer my own experience... I initially had some trouble getting the drivers to work on an offline computer. Others said their...

I'm not familiar with them, so sorry, I have no advice to offer, but good luck! In my circumstance, the diode protects the DC-DC converter itself when in standby or off, i.e. not in normal operation, so make sure you consider the other possible conditions.

I agree. For a number of MPPTs and other DC-DC converters, I couldn't tell from the product brochures what they would do at their limits - would they cut out, or hold at the limit? That's why I ended up going with DC-DC converters that advertised constant current / constant voltage behaviour...

I couldn't find enough data on the MPPT converters I looked at to determine what they would do when connected to an input without the limits of solar panels. A battery on the solar input is somewhat equivalent to a fixed voltage unlimited current solar panel. The MPPT would need some sort of...

I looked at using an MPPT converter to charge a 12V battery from a 48V battery, but I ended up getting a voltage & current limited DC-DC converter and it works well. I have a diode on the output to prevent backwards current from the 12V battery when the DC-DC converter is in standby, though I'm...

I didn't spot the updated serial protocol, thanks for sending it. I was still using 1.23. I need to do some updating. That explains why the checksum wasn't matching on the 0x56 message anymore - I need to update the checksum calculation to match 1.25 as this update is not backwards...

You're right, I loaded BMS8T firmware 4.03 and LCD firmware 4.02. I didn't post immediately after doing the update to do some testing and in that time the two versions slipped my mind. To provide further details, I didn't do a factory reset afterwards (after reading @Steve_S's post saying it...

I have loaded the new 4.02 firmware on my Chargery BMS and I am very happy with the update. I really like the return of the precision of the amps in/out as well as lowering the threshold for storage mode, since I have some low current loads that can add up over time and were previously ignored...