NathanL Posted July 19, 2020 Posted July 19, 2020 Hi everyone. I have a Victron Energy Easysolar MPPT 100/50 that blew due to a Gekko getting inside it and shorting the AC input. It blew a track off the board and seems to have blown the PCB transformer connected to it. My question is this. The transformer is primary 300V and secondary 16.4V. I can only get primary 230V & secondary 15V. Can I replace it with this spare? Does the extra 1.4V matter too much? Quote
Richard Mackay Posted July 19, 2020 Posted July 19, 2020 What is the function of the transformer? Victron are well supported so I would phone their main support centre and speak to their repairs dept. They might have a scrap PCB with a good transformer. Quote
JustinSchoeman Posted July 19, 2020 Posted July 19, 2020 It might work, but is a really bad idea. Rather get the correct part. Victron will probably supply it, or you should be able to get it on Aliexpress (I am pretty sure Wahhing has a store there). If you really must use an alternate part, then there are lots of things to consider. Firstly, the primary to secondary ratio is the important parameter, so 300:16.4 would equate to 230:12.6 - so you would be looking at a 12.6V transformer. Next are he reactive losses, which are likely to scale with the square of the differences, so you need a 70% higher VA rating. Then you get the things you can't do anything about: 1) insulation resistance (relates to max voltage, and usually has a fat margin on - but can you be sure it will hold up, and how long). 2) absolute inductance - which won't match at all unless you use exactly the same part (although it is often not critical, unless the part is used in a resonant or flyback configuration). It is important to note that 230V transformers are much cheaper and much more available than 300V, so there is probably a very specific reason (likely one of the two above) why Victron chose a 300V part. Quote
NathanL Posted July 19, 2020 Author Posted July 19, 2020 Thank you for the advice. I will try to get one directly from Victron. Quote
___ Posted July 19, 2020 Posted July 19, 2020 That's the power supply board you've got there. You should be able to order a replacement PSU board and swap it in, have a chat with your nearest repair center (not sure where they are exactly). Quote
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