HY5020E startup.

[roscoe]

I am using a 5020E to charge A123 battery packs for model aircraft use. My set-up at the feild consists of a 950 watt inverter type generator, a Honda 1000 clone marketed under the "Yardworks" label. It seems that the initial inrush to power up the Mastech on startup trips the overload protection instantly. A 115 v to 12 v RV power converter has the same effect.
The generator will run a 8" Skil saw or a large hammer drill with no problem. I have developed a way around the problem, but am wondering if any other users have had similar experiences, and whay was the solution.
Sean has been very helpful to date, but input from other users would be appreciated.

[cheap_stuff]

The surge input for switching-type power supplies can be very high (mine has a 15A fuse) but it lasts a very short time while it charges capacitors etc.

For this 950W inverter I'd recommend a linear type of power supply which is less efficient, but has a more gentle inrush current.

I guess you select 220VAC input and then switch it over to 110VAC input after the inrush. Also I guess you don't connect the A123 battery pack until later too.

This fine and non-damaging. You could increase the inverter wattage. You could also put a lamp in series with the power supply and then short it out after the inrush, allowing the full voltage into the power supply.

Dunno it this helps, but good luck .

[roscoe]

After the flying season ended, I took my generator in for investigation/repair, as it was still on warranty. About 5 months later, I tried to track it down, and was told "not repairable" (I think they lost it) and was given a full refund. I have since picked up a used Honda EX1000 generator, and so far,it handles the MasTec and my RV converter with no problems. Time will tell I guess

[sean]

You can reduce the in-rush current by turning it on without the load and with output set to low. once you start the power supply, you can turn the voltage to the desired level with the current limit at low level. connecting the load with low current level will minimize the sparks.

For battery charging, we recommend the new model HY5020EX. this model has built-in over-voltage protection, and is more robust.

In fact, for all applications with capacitive, inductive, or battery charging, we recommend the EX models, since they have over-voltage protection and is much more robust.