I purchased a DFC-650P charger. Prompt delivery and arrived sturdily packaged. It seemed well designed and solid however on testing I found it was tripping my MCB (minature circuit breaker) when switching to Jump Start setting, what a shame it was a faulty unit. I contacted Unionmart who were always helpful and courteous and after several discussions they agreed to have the unit collected and replaced. By chance I was able to test the unit at my neighbours and it worked perfectly. Seems the jump start surge current is in excess of 200 amps and standard (there are three types) MCB's need upgrading. It now works perfectly.