Darren2018
100 W
- Joined
- Aug 18, 2018
- Messages
- 223
Recently I have been using the DPX800S modules to charge batteries. I used to use the common 1200W/1800W "house brick" step up converters but the DPX800S is much more refined so I have swapped over to these. I have a faulty module and I wondered if you could replace the main FET with something that is better or add another one in parallel? I took one apart and it uses a 055N15A and I was thinking of changing it to a IRFP4568. The transistors are really expensive when you consider that the modules only cost £23 delivered but I can get 2 used IRFP4568 for £6. The modules get quite hot when ran at ~60% of their current or power specifications but just by adding a higher powered 6W fan I found I could run at ~85% without it getting too hot. I was wondering if an upgrade to the FET, its thermal path or the heatsink would compound these gains further? I have found 40x40x18mm heatsinks which could be placed vertically so the added area would not make the footprint any larger. This would also allow the FET and diode to be directly connected with thermal paste or a graphene thermal pad to the heatsink as they would be isolated. The total for these upgrades would be £16 which would bring the cost to £39 but it could potentially allow you to use 1 module reliably instead of 2 which is half the footprint, half the cabling and half the time to set it all up to charge a battery. Plus when I do eventually break a module I can rebuild them easily as I will keep those parts as spares. Anyone know of any better adjustable step up converters which do not need modifying and are not too expensive?