i blew the chinese 500W converter at tests with 200W halogen bulb in around 2 hours
upset i decided to build my own
it consists in 3 blocks
clock generator with 555
flip flop switch 1/2 of 4013
power block 2 BUZ48 for every 250W of load
i have reused the old ferite transformer and rewired it for my needs
i have tested this converter with 200W load for 1 day and is still working
(not from the test battery but from my 12V 2x17A dc source
)
for battery charger it needs an ac/dc rectifier and an operational as comparator (to monitor charging currrent and stop charging at full battery)
final one has 4 fets (to be shure that it resists in time and prevent overheating)
i have also added 2x200cm2 aluminium raditors
now everthing stays at 43C
price 18USD
