powmr HMS-3K-24V solar input just stopped!

[rgormley]

powmr HMS-3K-24V solar input just stopped charging ?

all was working as expected, then the solar input charge just stopped. and has not charged from solar since.
the HPS24V3000VA spec sheet says may open voltage 102v open circuit voltage and 40A max PV input dc for the MPPT input.
i measured 52-53VOC on a cool sunny day the panels are 12 years old. and generally was pushing around 25amps in the batts.

at the PV input terminals on the inverter i`m seeing the open circuit PV voltage of 53v (i presume as it`s unloaded and the MPPT is not working)

panels are working ok as i hooked them to another charge controller and they work fine..

The unit has reverted to mains charge so it will maintain the batts. (but obviously i would like the solar to charge the batts)

any ideas? or has the solar charge input section on the inverter died? running for 3.5 years... paid $300, get what you pay for i suppose...

** UPDATE: pulled the cover off and had a look inside found the problem! large air gap on a component! leg blown off
were getting on a plane in 4 hours, so i will just kill the PV input and deal with it when i return...

 

[HarryN]

Looks like it missed having a fire by not that much.

 

[rgormley]

Looks like it missed having a fire by not that much.

replaced the 2 x mosfets and it`s working again.... no other damage lucky... but why did they go pop?
crappy solder joint causing heat?
when i re-assembled and put god quality clean heatsink thermal paste/ compound between mosfet and heat sink block, hopefully to soak more heat away from the mosfets...

max voltage from pv (open PV circuit volts on sunny day is 60v) and i have the charger set at 20A max charge hhhmmm???
the specs for the GO42N10 should have handled that..

 

[Mattb4]

Do you get lightning in your location? Other than that it may just be a part that got by quality assurance.

 

[HarryN]

replaced the 2 x mosfets and it`s working again.... no other damage lucky... but why did they go pop?
crappy solder joint causing heat?
when i re-assembled and put god quality clean heatsink thermal paste/ compound between mosfet and heat sink block, hopefully to soak more heat away from the mosfets...

max voltage from pv (open PV circuit volts on sunny day is 60v) and i have the charger set at 20A max charge hhhmmm???
the specs for the GO42N10 should have handled that..


View attachment 265288

There are a lot of counterfeit semiconductors out there, unless they are purchased through a proven distribution channel. In the capacitor world, a common trick is to put a lower rated one inside of a larger can and re-label for a higher price.

I agree with staying under 60 volt input. I am DIYing a 24 volt system all-in-one, but will keep it under ~ 40 volts, in spite of the trade offs.