I'm new here but thought the following might be of interest. I'm building a 16S3P 60Ah pack (EIG cells) and needed a quick and dirty charger. I couldn't find a meanwell with the required voltage so took a punt on a £50 NVVV S-800-70 (70v 800W 11.4A) brick from Amazon. The quality of the brick is excellent, it looks much better built than the meanwell or clones that I have here.
Opening the unit up there is the usual voltage adjust, but also there is a multi-turn current adjust pot, note this unit uses a different PWM chip from the MW, but has what looks like a similar current limiter based on an op-amp.
Initially I got all the resistive loads in the house (fat fryer, electric radiator, kettle and fan heater) and loaded up the SMPS. This drew about 13.5A and the unit did not limit as it is spec'd to 135%. With the load still attached I turned down the current pot and the unit entered CC mode, I turned the pot until I got 10A and obviously Vout dropped accordingly. Removed the load and the voltage jumped back to the preset level. Tried it at 4 partial loads and the current regulation was within a 100mA, so this will work perfectly, and no need to alter anything on the circuit.
Here is the unit I bought:
https://www.amazon.co.uk/gp/product/B08BJS6H22
So now I have a bulk charger for the pack that nicely de-rated ~75%.
Cheers, Joe
Opening the unit up there is the usual voltage adjust, but also there is a multi-turn current adjust pot, note this unit uses a different PWM chip from the MW, but has what looks like a similar current limiter based on an op-amp.
Initially I got all the resistive loads in the house (fat fryer, electric radiator, kettle and fan heater) and loaded up the SMPS. This drew about 13.5A and the unit did not limit as it is spec'd to 135%. With the load still attached I turned down the current pot and the unit entered CC mode, I turned the pot until I got 10A and obviously Vout dropped accordingly. Removed the load and the voltage jumped back to the preset level. Tried it at 4 partial loads and the current regulation was within a 100mA, so this will work perfectly, and no need to alter anything on the circuit.
Here is the unit I bought:
https://www.amazon.co.uk/gp/product/B08BJS6H22
So now I have a bulk charger for the pack that nicely de-rated ~75%.
Cheers, Joe
